I.B. 3A74791H06

Effective March 2001 Supersedes I.B. 3A74791H05 dated July 2000

Cutler-Hammer

Instructions for Installation, Operation and Maintenance of Type W-VAC and W-VACR 36kV Vacuum Circuit Breakers

Type W-VAC (Drawout)

Type W-VACR (Fixed)

I.B. 3A74791H06 Page iii

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Cutler-Hammer

Pittsburgh, PA 15220

All possible contingencies which may arise during installation, operation or maintenance, and all details andvariations of this equipment do not purport to be covered by these instructions. If further information isdesired by purchaser regarding his particular installation, operation or maintenance of particular equipment,contact a Cutler-Hammer representative.

IMPROPERLY INSTALLING OR MAINTAININGTHESE PRODUCTS CAN RESULT IN DEATH, SERI-OUS PERSONAL INJURY, OR PROPERTY DAMAGE.

READ AND UNDERSTAND THESE INSTRUCTIONSBEFORE ATTEMPTING ANY UNPACKING, ASSEM-BLY, OPERATION OR MAINTENANCE OF THE CIR-CUIT BREAKERS.

INSTALLATION OR MAINTENANCE SHOULD BEATTEMPTED ONLY BY QUALIFIED PERSONNEL.THIS INSTRUCTION BOOK SHOULD NOT BE CON-SIDERED ALL INCLUSIVE REGARDING INSTALLA-TION OR MAINTENANCE PROCEDURES. IF FUR-THER INFORMATION IS REQUIRED, YOU SHOULDCONTACT CUTLER-HAMMER.

THE CIRCUIT BREAKERS DESCRIBED IN THISBOOK ARE DESIGNED AND TESTED TO OPERATEWITHIN THEIR NAMEPLATE RATINGS. OPERATIONOUTSIDE OF THESE RATINGS MAY CAUSE THEEQUIPMENT TO FAIL, RESULTING IN DEATH, BOD-ILY INJURY AND PROPERTY DAMAGE.

ALL SAFETY CODES, SAFETY STANDARDSAND/OR REGULATIONS AS THEY MAY BEAPPLIED TO THIS TYPE OF EQUIPMENT MUST BESTRICTLY ADHERED TO.

THE FIXED CIRCUIT BREAKER ELEMENTS AREDESIGNED TO BE INSTALLED PURSUANT TO ALLAPPLICABLE ANSI STANDARDS. SERIOUSINJURY, INCLUDING DEATH, CAN RESULT FROMFAILURE TO FOLLOW PROCEDURES OUTLINED INTHIS MANUAL, OR COMPLY WITH THE REQUIRE-MENTS OF APPLICABLE STANDARDS. THE CUS-TOMER IS RESPONSIBLE FOR PROVIDING ALLREQUIRED PHASE TO PHASE INSULATION, PHASETO GROUND INSULATION AND ALL BREAKERINTERLOCKS. THESE CIRCUIT BREAKER ELE-MENTS ARE SOLD PURSUANT TO A NON-STAN-DARD PURCHASING AGREEMENT WHICH LIMITSTHE LIABILITY OF THE MANUFACTURER.

! WARNING ! WARNING

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TABLE OF CONTENTS

PageSECTION 1: INTRODUCTION

1-1 Preliminary Comments and Safety Precautions..................................................................................................11-1.1 Warranty and Liability Information..........................................................................................................11-1.2 Safety Precautions .................................................................................................................................1

1-2 General Information.............................................................................................................................................11-3 Type W-VAC and W-VACR Vacuum Circuit Breaker Ratings ............................................................................21-4 Outlines and Dimensions ....................................................................................................................................3

SECTION 2: SAFE PRACTICES

2-1 Recommendations ..............................................................................................................................................5

SECTION 3: RECEIVING, HANDLING AND STORAGE

3-1 General ...............................................................................................................................................................63-2 Receiving.............................................................................................................................................................63-3 Handling ..............................................................................................................................................................63-4 Storage ...............................................................................................................................................................73-5 Tools and Accessories ........................................................................................................................................83-6 Type W-VAC and W-VACR Vacuum Circuit Breaker Weights ...........................................................................8

SECTION 4: INITIAL INSPECTION AND INSTALLATION

4-1 Introduction........................................................................................................................................................144-2 Manual Operation Check...................................................................................................................................144-3 Vacuum Interrupter Integrity..............................................................................................................................144-4 Insulation ...........................................................................................................................................................144-5 Contact Erosion and Wipe.................................................................................................................................144-6 Primary Circuit Resistance ................................................................................................................................144-7 Nameplate .........................................................................................................................................................144-8 Electrical Operation Check................................................................................................................................14

4-8.1 Circuit Breaker Insertion and Removal.................................................................................................154-8.2 Operation Check Performance.............................................................................................................16

4-9 Breaker/Structure Interfacing ............................................................................................................................164-9.1 Interface Interlocks ...............................................................................................................................164-9.2 Drawout Breaker Interfacing Check (W-VAC) ......................................................................................16

SECTION 5: DESCRIPTION AND OPERATION

5-1 Introduction........................................................................................................................................................185-2 Interrupter Assembly .........................................................................................................................................18

5-2.1 Vacuum Interrupter...............................................................................................................................195-2.2 Contact Erosion Indication ...................................................................................................................195-2.3 Loading Spring Indication.....................................................................................................................205-2.4 Contact Wipe and Stroke .....................................................................................................................20

5-3 Stored Energy Mechanism ................................................................................................................................20

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Page

5-3.1 Operation of Stored Energy Mechanism ..............................................................................................205-3.2 Charging...............................................................................................................................................205-3.3 Closing Operation.................................................................................................................................225-3.4 Tripping Operation................................................................................................................................22

5-4 Control Schemes...............................................................................................................................................225-4.1 Timing...................................................................................................................................................225-4.2 Secondary Disconnects........................................................................................................................225-4.3 Secondary Terminal Blocks..................................................................................................................265-4.4 Undervoltage Trip Device.....................................................................................................................26

5-5 Interlocks and Interfacing ..................................................................................................................................275-6 Levering Mechanism (W-VAC Only) .................................................................................................................275-7 Operations Counter ...........................................................................................................................................275-8 Ground Contact .................................................................................................................................................275-9 MOC and TOC Switch Operations ....................................................................................................................27

SECTION 6: INSPECTION, MAINTENANCE AND TROUBLESHOOTING

6-1 Introduction........................................................................................................................................................296-2 Frequency of Inspection and Maintenance .......................................................................................................29

6-2.1 Qualified Personnel ..............................................................................................................................296-2.2 Helpful Tools and Accessory Items ......................................................................................................296-2.3 General Torque Guidelines ..................................................................................................................29

6-3 Inspection and Maintenance Procedures ..........................................................................................................326-4 Vacuum Interrupter Integrity Test......................................................................................................................336-5 Contact Erosion.................................................................................................................................................336-6 Contact Wipe.....................................................................................................................................................336-7 Insulation ...........................................................................................................................................................346-8 Insulation Integrity Check ..................................................................................................................................346-9 Primary Circuit Resistance Check.....................................................................................................................346-10 Mechanism Check.............................................................................................................................................36

6-10.1 CloSureTM Test ......................................................................................................................................366-11 Lubrication.........................................................................................................................................................406-12 Troubleshooting Chart.......................................................................................................................................40

SECTION 7: RENEWAL PARTS

7-1 General .............................................................................................................................................................437-1.1 Ordering Instructions ............................................................................................................................43

FIGURES

Figure Title Page

1-1 Type W-VAC 36kV Drawout Circuit Breaker Outlines and Dimensions ....................................................31-2 Type W-VACR 36kV Fixed Circuit Breaker Outlines and Dimensions ......................................................43-1 Circuit Breaker Shown Mounted with Ramp Still in Shipping Position (W-VAC Only) ..............................63-2 Circuit Breaker Shown Being Moved Carefully Down Attached Ramp (W-VAC Only) .............................73-3 Optional Fifth Wheel Shown in Use (W-VAC Only)...................................................................................73-4 Front View W-VAC 36kV Drawout Vacuum Circuit Breaker ......................................................................93-5 W-VAC or W-VACR 36kV Vacuum Circuit Breaker with Front Cover Removed.....................................103-6 Rear View W-VAC 36kV Drawout Vacuum Circuit Breaker.....................................................................113-7 Rear View W-VACR Fixed Vacuum Circuit Breaker................................................................................12

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FIGURES

Figure Title Page

3-8 Typical W-VAC 36kV Escutcheon ...........................................................................................................134-1 Type W-VAC Circuit Breaker Manual Charging Handle in Use...............................................................154-2 Drawout Circuit Breaker (Bottom View) ...................................................................................................175-1 Rear View Showing Pole Unit Enclosure (W-VAC Only) .........................................................................185-2 Plate Over Rear Truck Opening 2000A Breakers and Above (W-VAC Shown) ......................................185-3 Graphic Representation of Arc Interruption .............................................................................................195-4 Closing Cam and Trip Linkage ................................................................................................................215-5 Charging Schematic ................................................................................................................................235-6 Typical W-VAC “DC” and “AC” Control Schematics (Drawout) ...............................................................245-7 Typical W-VACR “DC” and “AC” Control Schematics (Fixed) .................................................................235-8 Secondary Plug Shown Mounted Lower Left Drawout Circuit Breaker ...................................................265-9 Secondary Terminal Blocks Shown Mounted Bottom Front Fixed Circuit Breaker..................................275-10 Undervoltage Trip Device Configuration..................................................................................................286-1 Lubrication Points (Drawout Circuit Breaker Shown)...............................................................................316-2 Rear Measurement for Contact Erosion Being Made (Circuit Breaker Closed).......................................346-3 Graphical Representation of Contact Erosion Measurement ..................................................................346-4 Side View of Loading Spring Indicator (Circuit Breaker Closed) .............................................................356-5 Graphical Representation of Contact Wipe Measurement of Loading Spring Indicator ..........................356-6 Resistance Measurement Locations .......................................................................................................356-7 Status Indicators .....................................................................................................................................366-8 Starting Tape at Bottom...........................................................................................................................366-9 Wrapping Tape up around Cam ..............................................................................................................366-10 Attaching Tape Around to Back of Cam ..................................................................................................376-11 Attaching CloSureTM Test Tool at Hole “A” ...............................................................................................376-12 Attaching CloSureTM Test Tool at H Pole “B”............................................................................................376-13 Manually Charging Closing Springs.........................................................................................................376-14 Manually Closing Circuit Breaker with Marker in Hole “C”.......................................................................386-15 Top View of Cam and Marker Interface...................................................................................................386-16 Move Marker 15O to Right ........................................................................................................................386-17 Move Marker 15O to Left ..........................................................................................................................386-18 Remove Marked Masking Tape from Cam..............................................................................................386-19 Place Tape on Right Side Panel of Breaker ............................................................................................386-20 Illustrative Testing Tape Sample .............................................................................................................396-21 Front View of CloSureTM Tool Showing Mounting/Testing Hole Locations...............................................396-22 Typical Circuit Breaker Front View with CloSureTM Tool Attached ...........................................................39

TABLES

Table Title Page

1.1 Vacuum Circuit Breaker Ratings in Accordance with IEC-56....................................................................23.1 Approximate Circuit Breaker Weights .......................................................................................................85.1 Circuit Breaker Timing.............................................................................................................................266.1 Torque Guidelines...................................................................................................................................306.2 Test Voltage ............................................................................................................................................336.3 CloSureTM Tool Mounting /Testing Locations by Circuit Breaker Type ....................................................396.4 Approximate Resistance Measurements ................................................................................................407.1 Recommended Renewal Parts for IEC Rated Breakers .........................................................................43

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SECTION 1: INTRODUCTION

1-1 PRELIMINARY COMMENTS AND SAFETY PRE-CAUTIONS

This technical document is intended to cover mostaspects associated with the installation, application,operation and maintenance of the W-VAC and W-VACRVacuum Circuit Breakers. It is provided as a guide forauthorized and qualified personnel only. Please refer tothe specific WARNING and CAUTION in Section 1-1.2before proceeding. If further information is required bythe purchaser regarding a particular installation, applica-tion or maintenance activity, a Cutler-Hammer represen-tative should be contacted.

1-1.1 WARRANTY AND LIABILITY INFORMATION

NO WARRANTIES, EXPRESSED OR IMPLIED,INCLUDING WARRANTIES OF FITNESS FOR A PAR-TICULAR PURPOSE OF MERCHANTABILITY, ORWARRANTIES ARISING FROM COURSE OF DEAL-ING OR USAGE OF TRADE, ARE MADE REGARDINGTHE INFORMATION, RECOMMENDATIONS ANDDESCRIPTIONS CONTAINED HEREIN. In no event willCutler-Hammer be responsible to the purchaser or userin contract, in tort (including negligence), strict liability orotherwise for any special, indirect, incidental or conse-quential damage or loss whatsoever, including but notlimited to damage or loss of use of equipment, plant orpower system, cost of capital, loss of power, additionalexpenses in the use of existing power facilities, orclaims against the purchaser or user by its customersresulting from the use of the information and descrip-tions contained herein.

1-1.2 SAFETY PRECAUTIONS

All safety codes, safety standards and/or regulationsmust be strictly observed in the installation, operationand maintenance of this device.

THE WARNINGS AND CAUTIONS INCLUDED ASPART OF THE PROCEDURAL STEPS IN THIS DOCU-MENT ARE FOR PERSONNEL SAFETY AND PRO-TECTION OF EQUIPMENT FROM DAMAGE. ANEXAMPLE OF A TYPICAL WARNING LABEL HEAD-

ING IS SHOWN ABOVE IN REVERSE TYPE TOFAMILIARIZE PERSONNEL WITH THE STYLE OFPRESENTATION. THIS WILL HELP TO INSURETHAT PERSONNEL ARE ALERT TO WARNINGS,WHICH MAY APPEAR THROUGHOUT THE DOCU-MENT. IN ADDITION, CAUTIONS ARE ALL UPPERCASE AND BOLDFACE AS SHOWN BELOW.

COMPLETELY READ AND UNDERSTAND THE MA-TERIAL PRESENTED IN THIS DOCUMENT BEFOREATTEMPTING INSTALLATION, OPERATION ORAPPLICATION OF THE EQUIPMENT. IN ADDITION,ONLY QUALIFIED PERSONS SHOULD BE PERMIT-TED TO PERFORM ANY WORK ASSOCIATED WITHTHE EQUIPMENT. ANY WIRING INSTRUCTIONSPRESENTED IN THIS DOCUMENT MUST BE FOL-LOWED PRECISELY. FAILURE TO DO SO COULDCAUSE PERMANENT EQUIPMENT DAMAGE.

1-2 GENERAL INFORMATION

The purpose of this book is to provide instructions forunpacking, storage, use, operation and maintenance ofType W-VAC Drawout and Type W-VACR Fixed 36kVVacuum Circuit Breakers. They are similar in manyways with the main differences centering around thesecondary/primary connection methods and the mount-ing methods used. The differences are specificallyaddressed in this book. The Type W-VAC is a horizontaldrawout, roll on the floor type removable interrupter ele-ment. The Type W-VACR is a fixed interrupter elementwith the customer responsible for all required opera-tional and safety interfaces. Designed to IEC Standardsfor reliable performance, ease of handling, and simpli-fied maintenance, W-VAC and W-VACR circuit breakersprovide reliable control and protection for electricalequipment and circuits. In addition, these technological-ly advanced circuit breakers provide higher insulationlevels in less space, thus reducing the overallswitchgear size.

SATISFACTORY PERFORMANCE OF THESE CIR-CUIT BREAKERS IS CONTINGENT UPON PROPERAPPLICATION, CORRECT INSTALLATION ANDADEQUATE MAINTENANCE. THIS INSTRUCTIONBOOK MUST BE CAREFULLY READ AND FOL-LOWED IN ORDER TO OBTAIN OPTIMUM PERFOR-MANCE FOR LONG USEFUL LIFE OF THE CIRCUITBREAKERS.

! WARNING

! CAUTION

! WARNING

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Identification Rated Values

Circuit Voltage Insulation Level Current Duration Transient Current ValuesBreaker Withstand Voltage Normal Short of Short Recovery Short Out of Capacitor Switching RatingsType Current at Circuit Circuit Voltage (TRV) Circuit Phase Cable Single Back to Back

50 Hz Breaking Peak Time Making Switching Charging Capacitor Capacitor Current Value Current Current Current Bank Switching

➃ Current Current➂ ➂ ➄

Power LightningFrequency Impulse(1 Minute)➁

U Uw In Isc tth Uc t3 Id Ic Isb Ibb

kV rms kV rms kV Peak Amperes, rms kA rms Seconds kV Peak µs kA Peak kA Amperes,rms

360 W-VAC 16 36 80 170 630 16 3 62 108 40 4 50 630 630and 1250 630 630

360 W-VACR 16 1600 630 6302000 1000 1000

360 W-VAC 20 36 80 170 630 20 3 62 108 50 5 50 630 630and 1250 630 630

360 W-VACR 20 1600 630 6302000 1000 1000

360 W-VAC 25 36 80 170 630 25 3 62 108 63 6.3 50 630 630and 1250 630 630

360 W-VACR 25 1600 630 6302000 1000 1000

360 W-VAC 32 36 80 170 630 31.5 3 62 108 79 7.9 50 630 630and 1250 630 630

360 W-VACR 32 1600 630 6302000 1000 1000

➀ KEMA tested to applicable IEC-56 Standards (rated operating sequence 0 - .3 sec - CO - 15 sec - CO). Typical operating timevalues: opening 45 ms, closing 75 ms, and reclosing 18 cycles.

➁ IEC Standards require 70kV. All ratings tested to 80kV.➂ Also qualified for 250 ampere rating.➃ U=52kV, Uc=92kV, t3=216µ seconds.➄ Tested at 20 kA, 5 kHz inrush current.

Table 1.1 Vacuum Circuit Breaker Ratings in Accordance with IEC-56 ➀

1-3 TYPE W-VAC AND W-VACR VACUUM CIRCUIT BREAKER RATINGS (TABLE 1.1)

! WARNING

THE CIRCUIT BREAKERS DESCRIBED IN THISBOOK ARE DESIGNED AND TESTED TO OPERATEWITHIN THEIR NAMEPLATE RATINGS. OPERATIONOUTSIDE OF THESE RATINGS MAY CAUSE THE

EQUIPMENT TO FAIL, RESULTING IN DEATH, BODI-LY INJURY AND PROPERTY DAMAGE.

ALL SAFETY CODES, SAFETY STANDARDSAND/OR REGULATIONS AS THEY MAY BE APPLIEDTO THIS TYPE OF EQUIPMENT MUST BE STRICTLYADHERED TO.

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DIMENSIONS ARETO BASE PLATE

THESE DIMENSIONS ARETO INTERMEDIATE PAN

21.0

0 [5

33]

17.3

[440

]17

.4 [4

41]

11.1

[283

]

17.4

[441

]

7.5

[191

]

15.6

[397

]7.

7 [1

95]

24.1 [611]

18.2 [462]15.9 [405]

9.3 [236]

EARTHCONTACTS

1.3 [33]1.8 [46]

3.3 [85]

16.0 [407]

45.8 [1164]

47.1 [1197 REF]

27.6 [702]1.0 [26]

1.70 [43]7.7 [197]

600A - 1600A CONDUCTORS OTHERWISE SAME LENGTHAS 2000A CONDUCTORS

35.7 [908 REF]17.8 [454]

11.8 [300] 11.8 [300]

64.6

[164

1] .6 [1

4]

11.1

[283

REF

]

1.0

[26]

2.9

[75]

35.7 [908]17.9 [454]

16.4 [417] 16.4 [417]12.4 [314]

.2 [5]9.88 [251]

5.4 [137]

1.7[44]

11.5 (TYP)[293]

DETAIL PLAN VIEWIN DIRECTION OF ARROW “X”

4.50 [114]

6.22 [158]

.63 [16] MIN TRAVELTO TRIP

1.93

8 [4

9]

1.56

3 [3

9.7]

OPEN/CLOSEFLOOR TRIPPERS

M.O.C. OPERATOR

SEE PLAN VIEWIN DIRECTION OF ARROW "X"

4.6[117]

TOC Operator

Figure 1-1 Type W-VAC 36kV Drawout Circuit Breaker Outlines and Dimensions (inches and [mm])

1-4 OUTLINES AND DIMENSIONS

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Figure 1-2 Type W-VACR 36kV Fixed Circuit Breaker Outlines and Dimensions (inches and [mm])

35.75 [908]35.13 [892]

11.81 [300]11.81 [300]

15.6 [396]

31.2 [793]

1.77 [44]

L.H. Pole CTR. Pole R.H. Pole Open / CloseFloor Trippers M.O.C. Switch

8.22 [158] REF.

View Shows Right Side Inner and Outer WheelChannel Removed For Clarity

4.51 [115]REF.

.63 [16]Minimum TravelTo Trip

171

[43]

.63

[16]

Trav

el

87 [1

7]

1.34

[34]

Trav

el31.2 [793]

Proposed Floor Mounting Angles(Not Furnished by Cutler-Hammer)

Terminal Blocks

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SECTION 2: SAFE PRACTICES

2-1 RECOMMENDATIONS

Type W-VAC and W-VACR Vacuum Circuit Breakersare equipped with high speed, high energy operatingmechanisms. They are designed with several built-ininterlocks and safety features to provide safe and properoperating sequences. Cell interlocks used with drawoutcircuit breakers are meant to interact with the appropri-ate cell interface and levering mechanism.

TO PROTECT THE PERSONNEL ASSOCIATED WITHINSTALLATION, OPERATION, AND MAINTENANCEOF THESE CIRCUIT BREAKERS, THE FOLLOWINGPRACTICES MUST BE FOLLOWED:

• Only qualified persons, as defined in the NationalElectrical Safety Code, who are familiar with theinstallation and maintenance of medium voltage cir-cuits and equipment, should be permitted to work onthese circuit breakers.

• Read these instructions carefully before attemptingany installation, operation or maintenance of these cir-cuit breakers.

• If the final breaker design is drawout, always removethe breaker from the enclosure before performing anymaintenance. If the breaker is applied in a fixed con-figuration, always make sure that primary and sec-ondary power are disconnected from the breaker.Failure to do so could result in electrical shock leadingto death, severe personal injury or property damage.

• Do not work on a drawout circuit breaker with a sec-ondary test coupler engaged. Failure to disconnectthe test coupler could result in an electrical shockleading to death, personal injury or property damage.

• Do not work on a closed circuit breaker or a breakerwith closing springs charged. The closing springsshould be discharged and the main circuit contactsopen before working on the circuit breaker. Failure todo so could result in cutting or crushing injuries.

• Do not use an open circuit breaker by itself as the solemeans of isolating a high voltage circuit. Remove thecircuit breaker to the Disconnect position and follow alllock-out and tagging rules of the National ElectricalCode and any other applicable codes, regulations andwork rules.

• Do not leave a drawout circuit breaker in an intermedi-ate position in the cell. Always have the circuit breakereither in the Disconnect/Test or Connected position.Failure to do so could result in a flash over and possi-ble death, personal injury or property damage.

• Always remove the maintenance tool from the circuitbreaker after charging the closing springs.

• Circuit breakers are equipped with safety interlocks.Do Not remove, interfere with or in any manner defeatthem. This may result in death, bodily injury or equip-ment damage.

• Do not work on a circuit breaker suspended from a lift-ing yoke or chains. Maintenance work should be per-formed on a solid work surface, such as the floor.

! WARNING

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OR FOR OPENING, CLOSING THE CONTACTS ORCHARGING THE SPRINGS. THE CIRCUIT BREAKERMAY SLIP OR FALL CAUSING SEVERE PERSONALINJURY. ALWAYS PERFORM MAINTENANCE,REPAIR AND ADJUSTMENTS ON A SOLID WORKSURFACE CAPABLE OF SUPPORTING THE CIR-CUIT BREAKER.

W-VAC and W-VACR 36kV Vacuum Circuit Breakersare shipped mounted to a skid specially designed tofacilitate removal of the breaker. Refer to Figures 3-1and 3-2 and proceed with the following steps:

AFTER REMOVING THE BRACKETS USED TO HOLDTHE CIRCUIT BREAKER SECURELY TO THE SHIP-PING SKID AND ALL DURING THE PROCESS OFMOVING THE CIRCUIT BREAKER OFF OF THE SHIP-PING SKID AND DOWN THE RAMP TO THE FLOOR,TAKE SPECIAL PRECAUTIONS TO INSURE THATTHE CIRCUIT BREAKER IS MOVED SLOWLY ANDUNDER CONTROL TO AVOID ANY ACCIDENTS. THECIRCUIT BREAKER IS A LARGE DEVICE WHICHCOULD CAUSE SERIOUS BODILY INJURY IF IT ISTIPPED OVER OR PERMITTED TO ROLL IN ANUNCONTROLLED MANNER.

SECTION 3: RECEIVING, HANDLING ANDSTORAGE

3-1 GENERAL

Type W-VAC and W-VACR Vacuum Circuit Breakersare subjected to complete factory production tests inaccordance with IEC 56 and inspection before beingpacked. They are shipped in packages designed to pro-vide maximum protection to the equipment during ship-ment and storage and at the same time to provide con-venient handling. Tools and accessories, such as themaintenance tool, are shipped separately.

3-2 RECEIVING

If the circuit breaker is not to be used immediately but isto be placed in storage, maximum protection can beobtained by keeping it packed as shipped.

Upon receipt of the equipment, inspect the containersfor any signs of damage or rough handling. Open thecontainers carefully to avoid any damage to the con-tents. Use a nail puller rather than a crow bar whenrequired. When opening the containers, be careful tosave any loose items or hardware that may be other-wise discarded with the packing material. Check thecontents of each package against the packing list.

Examine the circuit breaker for any signs of shippingdamage such as broken, missing or loose hardware,damaged or deformed insulation and other components.File claims immediately with the carrier if damage or lossis detected and notify the nearest Cutler-Hammer Office.

The W-VAC and W-VACR 36kV shipping containerand pallet were specifically designed to facilitateremoval of the circuit breaker from its pallet andcontainer. Before proceeding, installation personnelshould be familiar with the procedures outlined inParagraph 3-3 entitled “Handling.”

3-3 HANDLING

DO NOT USE ANY LIFTING DEVICE AS A PLAT-FORM FOR PERFORMING MAINTENANCE, REPAIROR ADJUSTMENT OF THE CIRCUIT BREAKER OR

Figure 3-1 Circuit Breaker Shown Mounted with RampStill in Shipping Position (W-VAC Only)

! WARNING

! WARNING

NOTICE

LiftingYokeOpening

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Figure 3-2 Circuit Breaker Shown Being MovedCarefully Down Attached Ramp (W-VAC Only)

Figure 3-3 Optional Fifth Wheel Shown in Use (W-VAC Only)

Step 1: W-VACR breakers must be lifted from theshipping pallet. Refer to paragraph 3-5 for theoptional lifting yoke used with an overhead lift-ing device after all shipping hardware used tohold the breaker to the skid is removed.

Step 2: For W-VAC breakers, remove the verticallymounted ramp from the shipping skid andplace it on the floor next to the skid. It shouldbe positioned with the highest part of theramp next to the side of the skid with the frontof the circuit breaker.

Step 3: Remove the shipping brackets used to holdthe circuit breaker to the skid. Use the sameshipping brackets and hardware to attach theramp to the shipping skid.

Step 4: Slowly move the circuit breaker forward anddown the ramp. Make certain that the circuitbreaker moves down the ramp slowly andstraight in line with the ramp. Once the circuitbreaker is on the floor, it can be easily ma-neuvered via its integral wheels.

W-VAC breakers can also be lifted using theoptional lifting yoke described in Step 1.

3-4 STORAGE

If the circuit breaker is to be placed in storage, maxi-mum protection can be obtained by keeping it packedas shipped. Before placing it in storage, checks shouldbe made to make sure that the circuit breaker is freefrom shipping damage and is in satisfactory operatingcondition.

The circuit breaker is shipped with its contacts open andclosing springs discharged. The indicators on the frontpanel should confirm this. Insert the maintenance tool inthe manual charge socket opening (Figure 3-8).

Charge the closing springs by pumping the handle upand down approximately 38 times until a crisp metallic“click” is heard. This indicates that the closing springsare charged and is shown by the closing spring“charged” (yellow) indicator. Remove the maintenancetool. Push the “manual close” button. The circuit breakerwill close as shown by the circuit breaker contacts“closed” (red) indicator. Push the “manual trip” button.The circuit breaker will trip as shown by the circuitbreaker contacts “open” (green) indicator. After complet-ing this initial check, leave the closing springs “dis-charged” and circuit breaker contacts “open”.

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Outdoor storage is NOT recommended. If unavoidable,the outdoor location must be well drained and a tempo-rary shelter from sun, rain, snow, corrosive fumes, dirt,falling objects and excessive moisture must be provid-ed. Containers should be arranged to permit free circu-lation of air on all sides and temporary heaters shouldbe used to minimize condensation. Moisture can causerusting of metal parts and deterioration of high voltageinsulation. A heat level of approximately 400 watts foreach 100 cubic feet of volume is recommended with theheaters distributed uniformly throughout the structurenear the floor.

Indoor storage should be in a building with sufficientheat and air circulation to prevent condensation. If thebuilding is not heated, the same general rule for heat asfor outdoor storage should be applied.

3-5 TOOLS AND ACCESSORIES

Several tools and accessories, both standard andoptional are available for use with the circuit breaker.

Maintenance Tool (Standard): Used to charge closingsprings.

Lifting Yoke (Optional): Used to lift circuit breaker withoverhead lifting device.

Fifth Wheel (Optional): Used to maneuver a circuitbreaker on a flat, hard surface (Figure 3-3).

Table 3.1 Approximate Circuit Breaker Weights ➀

Rating Pounds

360 W-VAC 16 630 10701250 10801600 10902000 1140

360 W-VACR 16 630 9371250 9481600 9582000 1025

360 W-VAC 20 630 10701250 10801600 10902000 1140

360 W-VACR 20 630 9371250 9481600 9582000 1025

360 W-VAC 25 630 10701250 10801600 10902000 1140

360 W-VACR 25 630 9371250 9481600 9582000 1025

380 W-VAC 32 630 10701250 10801600 10902000 1140

360 W-VACR 32 630 9371250 9481600 9582000 1025

3-6 TYPE W-VAC AND W-VACR VACUUM CIRCUITBREAKER WEIGHTS (TABLE 3.1)

➀ Does not include shipping carton.

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Figure 3-4 Front View W-VAC 36kV Drawout Vacuum Circuit Breaker

Front Cover

Lift/Pull Handle

Circuit Breaker Wheel

Secondary Contact Block

Alignment Rollers

3

1

2

4

5

1

2

5

4

3

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Figure 3-5 W-VAC or W-VACR 36kV Vacuum Circuit Breaker with Front Cover Removed

10

9

11

12

13

Shock Absorber

Shunt Trip Assembly

Spring Release (Close Coil) Assembly

Closing Cam

Open/Close Indicator

Operations Counter

L.H. Closing Spring

Motor Cutoff Switch

R.H. Closing Spring

Opening Spring

Manual Charge Socket

Ratchet Wheel

Charging Motor

1

2

5

4

3

6

1 2

5

4

3

6

7

8

10 9

11

12

13

7

8

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Figure 3-6 Rear View W-VAC 36kV Drawout Vacuum Circuit Breaker

Pole Unit

Primary Disconnect

Insulation Shroud

Opening to View Contact Erosion Mark

Circuit Breaker Wheel

Alignment Rollers

TOC Operator

1

2

5

4

3

6

1

2

5

4

3

67

7

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Figure 3-7 Rear View W-VACR 36kV Fixed Vacuum Circuit Breaker

Pole Unit

Opening to View Contact Erosion Mark

Conductor Mounting Surface

1

2

3

3

1

2

3

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Figure 3-8 Typical W-VAC 36kV Escutcheon

Manual Charge Socket

Spring Charged/Discharged Indicator

Rating Nameplate

Manual Open Button

Manual Close Button

Open/Close Indicator

Operations Counter

1

2

5

4

3

6

7

1

2

5 4

36

7

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Figure 4-1 Type W-VAC Circuit Breaker ManualCharging Handle in Use

SECTION 4: INITIAL INSPECTION ANDINSTALLATION

4-1 INTRODUCTION

BEFORE PLACING THE CIRCUIT BREAKER IN SER-VICE, CAREFULLY FOLLOW THE INSTALLATIONPROCEDURE GIVEN BELOW. NOT FOLLOWINGTHE PROCEDURE CAN FAIL TO UNCOVER SHIP-PING DAMAGE THAT MAY RESULT IN INCORRECTCIRCUIT BREAKER OPERATION LEADING TODEATH, BODILY INJURY, AND EQUIPMENT DAM-AGE.

Before attempting to put a circuit breaker in service, itshould be carefully examined and operated manuallyand electrically. In addition, carefully examine the break-er for loose or obviously damaged parts. The followinginformation is a guide for performing recommendedchecks and tests.

4-2 MANUAL OPERATION CHECK

Refer to Figures 3-8 and 4-1 and then proceed by plac-ing the maintenance tool into the manual charge socketopening. Charge the closing springs with about 38 upand down strokes of the handle. When charging is com-plete the closing crank goes over center with an audibleCLICK and the springs Charged/Discharged indicatorshows “Charged.”

If the springs are to be charged on a closed circuitbreaker, no click is heard at the end of chargingoperation. Discontinue charging and remove themaintenance tool as soon as “Charged” flag is fullyvisible. Continued attempts to charge further mayresult in damage to the mechanism.

Remove the maintenance tool. Close and trip the circuitbreaker. Repeat several times.

4-3 VACUUM INTERRUPTER INTEGRITY

Using a dry, lint free cloth or paper towel, clean all theaccessible insulating surfaces of the pole units. Conducta vacuum interrupter integrity check as described inSection 6.

! WARNING

NOTICE

4-4 INSULATION

Check the circuit breaker’s primary and secondary insu-lation as described in Section 6.

4-5 CONTACT EROSION AND WIPE

Manually charge the closing springs and close the cir-cuit breaker. Check contact erosion and wipe asdescribed in Section 6.

4-6 PRIMARY CIRCUIT RESISTANCE

Check the primary circuit resistance as described inSection 6. The resistance should not exceed the valuesspecified. Record the values obtained for future refer-ence.

4-7 NAMEPLATE

Compare the circuit breaker nameplate information withswitchgear drawings for compatibility.

4-8 ELECTRICAL OPERATION CHECK

After having completed all previous checks and tests,the circuit breaker is ready to be operated electrically. Itis preferred that this check be made with the circuit

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cuit breaker, manually engaging the secondary contactsnow makes this the TEST position.

To engage the secondary contacts, grasp the structuremounted secondary disconnect cage handle locatedbelow the left side of the circuit breaker, and pull it for-ward as far as possible to make the secondary engage-ment. As soon as control power is available, the motorwill charge the closing springs.

To move the circuit breaker to the CONNECTED posi-tion, engage the levering crank with the structure mount-ed levering shaft and begin turning the handle in aclockwise direction. Keep in mind that the levering crankcannot be engaged with the circuit breaker closed.Structure mounted positive guidance rails interface withthe circuit breaker alignment rollers to insure proper pri-mary and secondary connections.

The circuit breaker includes all necessary interlocksthat when interfaced with a compatible structure willrender the circuit breaker mechanism mechanicallyand electrically trip-free during the levering processinto or out of the structure. For detailed informationpertaining to individual circuit breaker interlocks,refer to Paragraph 4-9 in this section.

As the handle is turned, the circuit breaker will moveslowly toward the rear of the structure and the integrallymounted floor movement wheels will be lifted from thefloor of the structure. Eventually, the integrally mountedwheels are separated from the structure floor by approx-imately 1/8 inch, and the circuit breaker is suspended inthe structure. This design insures positive primary andsecondary connections, even if the assembly’s mount-ing conditions are less than ideal.

When the circuit breaker reaches the CONNECTEDposition, it will become impossible to continue turningthe levering crank in the clockwise direction. The sec-ondary contacts will automatically engage in the CON-NECTED position, if not already engaged manually inthe TEST position.

To remove the circuit breaker from the structure,reverse the procedure just described by turning the lev-ering crank in a counterclockwise direction. Keep inmind that safety interlocks may cause the circuit breakerto open and/or springs discharge during the removalprocedure. It depends on what condition the circuitbreaker was in as removal began.

breaker in a TEST position or by using a test cable, ifthe circuit breaker is outside the cell structure.

For fixed breaker applications, an electrical operationscheck should be performed after the breaker is appropri-ately mounted, secondary wiring completed, and appro-priate interphase barriers installed.

BEFORE INSERTING THE CIRCUIT BREAKER EXAM-INE THE INSIDE OF THE CELL STRUCTURE FOREXCESSIVE DIRT OR ANYTHING THAT MIGHT INTER-FERE WITH THE CIRCUIT BREAKER MOVEMENT.

EXTREME CAUTION MUST BE EXERCISED TOINSURE THAT PRIMARY CIRCUITS ARE NOT ENER-GIZED WHILE CHECKS ARE PERFORMED IN THECIRCUIT BREAKER COMPARTMENT. FAILURE TODO SO MAY RESULT IN PERSONAL INJURY ORDEATH.

The circuit breaker is normally tested electrically in itscell structure in the TEST position. To achieve the TESTposition, the circuit breaker must first be placed in thecell structure and the secondary contacts engaged. Tocomplete this testing procedure, the operator should firstbe familiar with inserting and removing the circuit break-er into and from the cell structure.

4-8.1 CIRCUIT BREAKER INSERTION ANDREMOVAL

The drawout W-VAC circuit breaker is designed to be inone of three different positions within the structure withthe door closed, DISCONNECT, TEST and CONNECT-ED. While in the structure, the circuit breaker shouldnever be allowed to remain at an intermediate positionbetween two of the three above mentioned designedpositions.

Position the circuit breaker squarely in front of the struc-ture. Integrally mounted wheels facilitate circuit breakermovement outside of and into the structure. Once theside mounted circuit breaker alignment rollers arealigned with structure mounted alignment rails, push thecircuit breaker into the structure as far as it will move.The levering latch must be fully engaged or the circuitbreaker will not be able to be inserted. This first positionis the DISCONNECT position. Without moving the cir-

! WARNING

! CAUTION

NOTICE

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4-8.2 OPERATION CHECK PERFORMANCE

Move the W-VAC circuit breaker to the TEST positionand engage the secondary contacts following the proce-dure described in Paragraph 4-8.1. As soon as controlpower becomes available, the motor will charge theclosing springs with this condition indicated by a SpringCharged/Discharged Indicator on the front of the circuitbreaker (Figure 3-8). In addition, the status of the maincontacts, open or closed, is indicated on the front of thecircuit breaker.

Using the close and trip buttons on the front of the cir-cuit breaker, close and trip the circuit breaker severaltimes to verify the closing and tripping operations.Conclude the check by closing the circuit breaker.

The W-VACR fixed circuit breaker can be checked in asimilar fashion as long as the circuit breaker is isolatedwith no primary power present. The operation perfor-mance can be conducted as long as secondary controlpower is present.

4-9 BREAKER/STRUCTURE INTERFACING

Type W-VAC Vacuum Circuit Breakers are supplied witha series of interlocks to insure safe and proper interfac-ing between the circuit breaker and a compatible struc-ture compartment. The specific interlocks are describedin the next paragraph to provide the proper familiariza-tion. Once the interlocks are reviewed, an interfacingcheck can be performed as described in Paragraph 4-9.2.

4-9.1 INTERFACE INTERLOCKS

Each circuit breaker is supplied with the following inter-locks to insure safe and proper operation (Figure 4-2):

Code Plates (W-VAC Only)

Code plates are mounted at the bottom of the circuitbreaker to prevent the insertion of a circuit breaker intoa structure of higher power rating. A set of two codeplates on the circuit breaker and two in the compartmentform this interlock.

Code plates do not block out control voltage orscheme incompatibility.

Close and Trip Floor Trippers

Mounted on the bottom of the circuit breaker, theseinterlocks interface with compatible structure interlocksto render the circuit breaker mechanism mechanicallyand electrically trip free during the levering process.

Anti-Close Interlock

This interlock prevents releasing the closing springselectrically or manually if the circuit breaker is alreadyclosed (Figure 5-5). On a closed circuit breaker, theinterlock lever moves toward the rear. In this position,the movement of the spring release clapper does not liftthe lever and thus the spring release latch cannot bemoved.

4-9.2 DRAWOUT BREAKER INTERFACING CHECK(W-VAC)

Keep in mind that an interfacing check will be made witha compatible structure. As such, the instructions provid-ed with the assembly will suggest other interfacing con-ditions that should be observed and/or checked, such asprimary shutter operation, MOC/TOC operation and lev-ering handle insertion. A complete, coordinated inter-face check, therefore, will be a blend of the circuitbreaker instructions and those provided with the struc-tural assembly. Together all required standards are metand the ultimate in safety is achieved.

Insert the circuit breaker into the structure and lever itinto and out of each different position by following theprocedures described in Paragraph 4-8.1.

When the secondary contacts are manually engaged inthe TEST position, the motor will charge the closingsprings. Close the circuit breaker. Attempt to engage thelevering crank to begin moving the circuit breaker to theCONNECTED position. It will first be noticed that thelevering crank cannot be engaged with the breakerclosed. In addition, charged springs will be dischargedas the circuit breaker starts to move.

Once in the CONNECTED position, remove the leveringhandle, close the circuit breaker and the motor will begincharging the closing springs if control power is available.Once again engage the levering handle which can onlybe accomplished with the circuit breaker open.

Lever the circuit breaker toward the TEST position. Thecircuit breaker will be in a trip-free condition. Continue tolever the circuit breaker all the way to the TEST positionand the secondary contacts will be disengaged, nowmaking it the DISCONNECT position

NOTICE

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Manually engage the secondary contacts and the motorwill charge the closing springs. Close the circuit breakerand begin to remove the circuit breaker to the WITH-DRAWN position by lifting and pulling on the Lift/Pullhandle. The circuit breaker will trip, close and trip as itmoves from the TEST position.

The suggested combination of interface checks outlinedin the circuit breaker manual and structural assemblymanual are intended to verify safe and proper operation.If observed conditions are not as described, contactCutler-Hammer for assistance.

Figure 4-2 Drawout Circuit Breaker (Bottom View)

Secondary Disconnect Plug

Close Floor Tripper

Trip Floor Tripper

1

2 5

6

4

3

MOC Operator

Code Plates

Position of Optional SecondSecondary Disconnect

1 2 543

6

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Figure 5-1 Rear View Showing Pole Unit Enclosure(W-VAC Shown)

Figure 5-2 Plate Over Rear Truck Opening 2000ABreakers and Above (W-VAC Shown)

SECTION 5: DESCRIPTION AND OPERATION

5-1 INTRODUCTION

The Type W-VAC 36kV Vacuum Circuit Breaker is ahorizontal drawout roll on the floor design for use in newswitchgear, as well as for modernization and life exten-sion of existing switchgear. The Type W-VACR VacuumCircuit Breaker is a fixed design, with the customerresponsible for all required interfaces and barriers.Either design is for use in new switchgear, as well as formodernization and life extension of existing switchgear.The circuit breakers meet or exceed all applicable IECStandards.

Circuit breakers are operated by a motor charged springtype stored energy mechanism, charged normally by anelectric motor or manually by a manual charging tool.The primary disconnecting contacts are self-aligning, sil-ver plated copper. VCP-W Circuit Breakers are of a mod-ular type construction containing a front accessiblemechanism with unobstructed access to control compo-nents. Self-contained vacuum interrupter pole unitassemblies are removable as complete individual units.

The primary insulation used in the circuit breaker design iscycloaliphatic epoxy. Type SIS, AWG #14 control wire with

cross-linked polyolefin insulation is used throughout thecontrol circuits with all terminals being of the screw type.This section describes the overall operation of the circuitbreaker as well as the function and operation of allmajor sub-assemblies and/or parts.

5-2 INTERRUPTER ASSEMBLY

The W-VAC and W-VACR 36kV designs utilize threeindividually mounted and removable pole units. Eachpole unit is enclosed in a four sided continuous chimneytype cycloaliphatic epoxy support molding. Black insulat-ing shrouds cover and seal the openings where upperand lower primary conductors enter and exit thecycloali-phatic epoxy enclosure (Figure 5-1). The dis-connecting ends of the primary conductors utilize round,floating type primary disconnecting finger clusters forinterfacing with the switchgear structure mounted prima-ry conductors.

The rear portion of the circuit breaker, on which the poleunits are mounted, utilizes a bolted on plate to cover arectangular opening in the truck for circuit breakersabove 1600 amperes. Closure of the opening providesfor proper air circulation up through each pole unitenclosure on 2000 ampere and above circuit breakers(Figure 5-2).

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At current zero, the arc is extinguished and vapor produc-tion ceases. Very rapid dispersion, cooling, recombina-tion, and deionization of the metal vapor plasma, togeth-erwith the fast condensation of metal vapor products,cause the vacuum to be quickly restored. Hence, theopened contacts withstand the transient recovery voltage.

5-2.2 CONTACT EROSION INDICATION

The purpose of a contact erosion indicator is to monitorthe erosion of the vacuum interrupter contacts, which isvery minimal over time with vacuum interrupters utilizingcopper-chrome contact material. If contact erosionreaches 1/8 inch, the interrupter must be replaced.

Each phase of the circuit breaker is monitored inde-pendently.

Contact erosion is monitored from the rear of the circuitbreaker. It provides a very accurate indication of contacterosion, and is the primary determinant of contact condi-tion. A contact erosion indicator mark is located on theinsulated drive rod of each interrupter (Figure 6-2).

THE PLATE BOLTED TO THE REAR RECTANGU-LAR OPENING ON ALL 2000 AMPERE AND ABOVECIRCUIT BREAKERS AND IDENTIFIED IN FIGURE 5-2 MUST BE BOLTED IN POSITION BEFORE PLAC-ING A CIRCUIT BREAKER IN SERVICE TO INSUREPROPER OPERATION WITHIN TEST PROVENPARAMETERS.

Vacuum interrupters are mounted vertically and support-ed from the fixed stem which is clamped to the top con-ductor. The exclusive current transfer system consists ofa series of plated, high-conductivity copper leaf conduc-tors that are pressed on the movable interrupter stem.This design provides a multipoint contact resulting in lowelectrical and thermal resistance. Utilizing this non-slid-ing current transfer system between the movable stemand the circuit breaker main conductor eliminates main-tenance of this joint.

Direct acting insulated operating rods in conjunction withthe circuit breaker’s mechanism provide a fixed amountof interrupter movable stem motion. This motion isdirectly related to the interrupter’s “Wipe” and “Stroke,”each of which is discussed in detail later in this section.

5-2.1 VACUUM INTERRUPTER

W-VAC and W-VACR 36kV Vacuum Circuit Breakersutilize vacuum interrupters for interruption and switchingfunctions. The vacuum interrupters use axial-magnetic,copper chrome contacts for superior dielectric strength,better performance characteristics, and lower chop cur-rent. Vacuum interruption provides the advantages ofenclosed interrupters, reduced size and weight, shortinterrupting time, long life, reduced maintenance, andenvironmental compatibility.

Arc interruption is simple and fast (Figure 5-3). In theclosed position, current flows through the interrupter.When the contacts are opened, the arc is drawnbetween the contact surfaces. It is moved rapidlyaround the slotted contact surfaces by a self-inducedmagnetic force which prevents gross contact erosion aswell as the formation of hot spots on contact surfaces.The arc burns in an ionized metal vapor which continu-ally leaves the contact area and condenses on the sur-rounding metal shield.

Figure 5-3 Graphic Representation of Arc Interruption

Interruption

CurrentZero

Shield Involvement

High CurrentArc Mode

ArcInitiation

RecoveryVoltage

FaultCurrent

! CAUTION

NOTICE

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AND OPEN THE CIRCUIT BREAKERS BEFORE PER-FORMING ANY CIRCUIT BREAKER MAINTENANCE,INSPECTION OR REPAIR.

The spring stored energy operating mechanism isarranged vertically in front of all W-VAC and W-VACRcircuit breakers (Figure 3-5). It includes all the elem-ents for storing the energy, closing and tripping of thecircuit breaker, as well as manual and electrical con-trols. The manual controls are all front accessible.Motion to close and open the interrupter contacts isprovided through operating rods connecting themechanism pole shaft to the bell cranks of the inter-rupter assemblies.

5-3.1 OPERATION OF STORED ENERGYMECHANISM

The mechanism stores the closing energy by chargingthe closing springs. The mechanism may rest in any oneof the four positions shown in Figure 5-4 and as follows:

a. Circuit breaker open, closing springs dischargedb. Circuit breaker open, closing springs chargedc. Circuit breaker closed, closing springs dischargedd. Circuit breaker closed, closing springs charged

5-3.2 CHARGING

Figure 5-5 is a schematic view of the spring chargingparts of the stored energy mechanism.

The major component of the mechanism is a cam shaftassembly which consists of a drive shaft to which areattached two closing spring cranks (one on each end),the closing cam, drive plates, and a free-wheeling ratch-et wheel. The ratchet wheel is actuated by an oscillatingmechanism driven by the motor eccentric. As the ratchetwheel rotates, it pushes the drive plates which in turnrotate the closing spring cranks and the closing camwith it.

The closing spring cranks have spring ends connectedto them, which are in turn coupled to the closing springs.As the cranks rotate, the closing springs are charged.When the closing springs are completely charged, thespring cranks go over dead center, and the closing stoproller comes against the spring release latch. The clos-ing springs are now held in the fully charged position.

Closing springs may also be charged manually. Insertthe maintenance tool in the manual charging socket.Move it up and down approximately 38 times until aclicking sound is heard, and the closing springs charg-ing indicator indicates “Charged.” Any further motion of

5-2.3 LOADING SPRING INDICATION

The contact loading spring indicator is an additionalmethod provided to indicate conditions within the vacuuminterrupter, as well as the overall system condition. The vis-ible indication, on each phase, is used to indicate whetherthe contact loading springs are maintaining the proper con-tact pressure to keep the contacts closed. Severe contacterosion or an adjustment need after an interrupter assem-bly replacement would result in an unacceptable indicationfrom this indicator (Figures 6-4 and 6-5).

5-2.4 CONTACT WIPE AND STROKE

Contact wipe is the indication of (1) the force holding thevacuum interrupter contacts closed and (2) the energyavailable to hammer the contacts open with sufficientspeed for interruption.

Stroke is the gap between fixed and moving contacts ofa vacuum interrupter with the circuit breaker open.

The circuit breaker mechanism provides a fixed amountof motion to the operating rods. The first portion of themotion is used to close the contacts (i.e. stroke) and theremainder is used to further compress the preloadedwipe spring. This additional compression is called wipe.Wipe and Stroke are thus related to each other. As thestroke increases due to the erosion of contacts, the wipedecreases. A great deal of effort has been spent in thedesign of all Cutler-Hammer vacuum circuit breakers, inorder to eliminate the need for field adjustments of wipeor stroke.

THERE IS NO PROVISION FOR IN SERVICEADJUSTMENTS OF CONTACT WIPE AND STROKE.ALL SUCH ADJUSTMENTS ARE FACTORY SETAND SHOULD NOT BE ATTEMPTED IN THE FIELD.

5-3 STORED ENERGY MECHANISM

KEEP HANDS AND FINGERS AWAY FROM THE CIR-CUIT BREAKER’S INTERNAL PARTS WHILE THECIRCUIT BREAKER CONTACTS ARE CLOSED OR THE CLOSING SPRINGS ARE CHARGED. THE CIR-CUIT BREAKER CONTACTS MAY OPEN OR THECLOSING SPRINGS DISCHARGE CAUSING A CRUSHING INJURY. DISCHARGE THE SPRINGS

! CAUTION

! WARNING

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2

37

8 4

5

6

1

9

10

Figure 5-4 Closing Cam and Trip Linkage

Figure 5-4d Breaker closedand closing spring charged

Figure 5-4b Breaker openand closing spring charged

Figure 5-4a Breaker openand closing spring discharged

Figure 5-4c Breaker closedand closing spring discharged

9

5

6

4

8

73 10

2

1 Cam Shaft

Closing Cam

Trip Latch

Banana Link

Pole Shaft

Pole Unit Actuating Lever

Shock Absorber

Main Link Roller

Main Link

Trip Bar “D” Shaft

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the maintenance tool will result in free wheeling of theratchet wheel.

5-3.3 CLOSING OPERATION

Figure 5-4 shows the position of the closing cam andtripping linkage. Note that in Figure 5-4a in which thecircuit breaker is open and the closing springs are dis-charged, the trip “D” shaft and trip latch are in theunlatched position.

Once charged, the closing springs can be released toclose the circuit breaker by moving the spring releaselatch out of the way. This is done electrically or manuallyby depressing the spring release lever, which turns thespring release latch out of the way of the closing stoproller. The force of the closing spring rotates the camshaft through the spring cranks. The closing cam, beingattached to the cam shaft, in turn rotates the pole shaftthrough the main link to close the circuit breaker.

In Figure 5-4c the linkage is shown with the circuitbreaker in the closed position before the closing springshave been recharged. Interference of the trip “D” shaftwith the trip latch prevents the linkage from collapsing,and the circuit breaker is held closed.

Figure 5-4d shows the circuit breaker in the closed posi-tion after the closing springs have been recharged. Notethat the spring charging rotates the closing cam by onehalf turn. Since the cam surface in contact with the mainlink roller is cylindrical in this region, the spring chargingoperation does not affect the mechanism linkage.

Since the primary contacts are completely enclosed inthe vacuum interrupter and not adjustable in any way, a“Slow Close” capability is not provided with W-VAC orW-VACR circuit breakers.

5-3.4 TRIPPING OPERATION

When the trip “D” shaft is turned either by the trip buttonor trip coil, all links return to the original “open” conditionshown in Figure 5-4a.

5-4 CONTROL SCHEMES

There are two basic control schemes for 36kV W-VACand W-VACR circuit breakers, one for DC control andone for AC control voltages (Figures 5-6 and 5-7). Theremay be different control voltages or more than one trip-ping element, but the principal mode of operation is asfollows:

As soon as the control power is applied, the springcharging motor automatically starts charging the closingsprings. When the springs are charged, the motor cut offLS1/bb switch turns the motor off. The circuit breakermay be closed by making the control switch close(CS/C) contact. Automatically upon closing of the circuitbreaker, the motor starts charging the closing springs.The circuit breaker may be tripped any time by makingthe control switch trip (CS/T) contact.

Note the position switch (PS1) contact in the springrelease circuit in the scheme. This contact remainsmade while the circuit breaker is being levered betweenthe TEST and CONNECTED positions. Consequently, itprevents the circuit breaker from closing automatically,even though the control close contact (CS/C) may havebeen made while the circuit breaker is levered to theCONNECTED position.

The position switch (PS2) contact is in the motor circuit.It prevents the motor from starting until the fully CON-NECTED position is reached and the secondary con-tacts are firmly engaged.

When the CS/C contact is made, the SR closes the cir-cuit breaker. If the CS/C contact is maintained after thecircuit breaker closes, the Y relay is picked up. The Y/acontact seals in Y until CS/C is opened. The Y/b contactopens the SR circuit, so that even though the circuitbreaker would subsequently open, it could not bereclosed before CS/C was released and remade. This isthe anti-pump function.

5-4.1 TIMING

The opening and closing times for the circuit breakersvary depending upon the control voltage and the powerrating. Typical values for 36kV W-VAC and W-VACRcircuit breakers are shown in Table 5.1.

5-4.2 SECONDARY DISCONNECTS

The W-VAC drawout circuit breaker control wiring isarranged to connect a standard 24 point male plug witha corresponding switchgear compartment mountedfemale plug. An additional 24 point plug is optional.

Drawout circuit breakers utilize fixed mounted maleplugs located under the left bottom portion of the circuitbreaker truck. When two 24 point plugs are supplied,they are mounted in a stacked arrangement (Figure 5-8). Fixed mounted circuit breaker secondary plugs con-nect to corresponding movable female plugs mounted inthe bottom of the switchgear compartment.

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12

4

11

8

14

10

2

9

13

7

1

3

6

5

Breaker Open, Springs Discharged Breaker Closed, Springs Charged

Pole Shaft

Anti-Close Interlock

Spring Release (Close) Latch

Spring Crank

Closing Spring

Closing Spring Fixed End

Spring Release (Close) Coil

Figure 5-5 Charging Schematic

9

11

5

6

4

8

7

3 10

2

1

12

Cam Shaft

Motor Ratchet Lever

Drive Pawl

Ratchet Wheel

Holding Pawl

Spring Release (Close) Clapper

Spring Release Latch (Close Roller)13

14

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5251

7

18

5453

17

5655

16

5857

15

8 9 10

22

3

a bM

YSR

ST1

WL GL RLSPRINGCHARGEDINDICATINGLIGHT

P

N

LS1bb

3 3A

1 2

24

4

CS C

7

PS1 Y LS2bb

LS2aa

4

LCb

21

Y

b

20

5

a

a

6

19

1314

109

a b b

CST

PR

ST2

UV

9UV

10UV

9A10

A

13

12

14

a

a

11

CUSTOMER MUST FURNISHTHIS “a” CONTACT FROM AUXILIARY SWITCH WHEN SECOND TRIP COIL OPTIONIS CHOSEN AND MAKE THE APPROPRIATE CONNECTIONS.

AUXILIARY SWITCH #2 OPTIONAL

a b ba b a b a b a

DC S

OURC

E

6

PS2

U24 U19U20U21U22U23 U16U17U18 U15

U1 U9U8U7U6U5U4U3U2 U10

OPTIONS

YSR

GL RL

1

2

CS C

7

Y LS2bb

LS2aa

4

LCb

21

Yb

b

20

5

a

9

16

14 5655

CST

PR

AC S

OURC

E

13

AC (+)CAP TRIP DEVAC (-)

ST1

a

a

109

619

5251

7

18

5453

17

5857

15

8 10

22

3

a b b b

ST2

UV9U

V10

UV9A

10A

13

12

14

a

a

11

CUSTOMER MUST FURNISHTHIS “a” CONTACT FROM AUXILIARY SWITCH WHEN SECOND TRIP COIL OPTIONIS CHOSEN AND MAKE THE APPROPRIATE CONNECTIONS.

AUXILIARY SWITCH #2 OPTIONAL

a b ba b a b a b a

U24 U19U20U21U22U23 U16U17U18 U15

U1 U9U8U7U6U5U4U3U2 U10

OPTIONS

6

M

WLSPRINGCHARGEDINDICATINGLIGHT

LS1bb

3 3A

1 2

24

4

PS2 PSI

UV

14

9UV

10UV

11

FOR AC UVTRIP ONLY

Figure 5-6 Typical W-VAC “DC” and “AC” Control Schematics (Drawout)

BREAKER DC CONTROL SCHEMATIC8796C77H01

BREAKER AC CONTROL SCHEMATIC8796C77H02

CS – Breaker Control Switch – closeCCS – Breaker Control Switch – tripT

Y – Anti Pump Relay SR – Spring Release Coil (Close Coil) M – Spring Charging Motor ST – Shunt TripPR – Protective Relay

– Secondary Disconnect

OPERATION SWITCH TERMINAL

LS1 Open until springs ‘C’ and ‘NC’aa are fully charged Brown Switch

LS1 Closed until springs ‘C’ and ‘NO’bb are fully charged

LS2 Open until springs ‘C’ and ‘NC’aa are fully charged Black Switch

LS2 Closed until springs ‘C’ and ‘NO’bb are fully charged

LC Open until mechanism ‘C’ and ‘NO’is reset

PS1 Open in all except between ‘C’ and ‘NC’‘Test’ and ‘Connected’ positions

PS2 Closed in all except between ‘C’ and ‘NO’‘Test’ and ‘Connected’ positions

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Figure 5-7 Typical W-VACR “DC” and “AC” Control Schematics (Fixed)

BREAKER DC CONTROL SCHEMATIC8796C77H01

BREAKER AC CONTROL SCHEMATIC8796C77H02

CS – Breaker Control Switch – closeCCS – Breaker Control Switch – tripT

Y – Anti Pump Relay SR – Spring Release Coil (Close Coil) M – Spring Charging Motor ST – Shunt TripPR – Protective Relay

– Secondary Disconnect

OPERATION SWITCH TERMINAL

LS1 Open until springs ‘C’ and ‘NC’aa are fully charged Brown Switch

LS1 Closed until springs ‘C’ and ‘NO’bb are fully charged

LS2 Open until springs ‘C’ and ‘NC’aa are fully charged Black Switch

LS2 Closed until springs ‘C’ and ‘NO’bb are fully charged

LC Open until mechanism ‘C’ and ‘NO’is reset

PS1 Open in all except between ‘C’ and ‘NC’‘Test’ and ‘Connected’ positions

PS2 Closed in all except between ‘C’ and ‘NO’‘Test’ and ‘Connected’ positions

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For a basic understanding of the operation of the under-voltage trip device refer to the specific items identified inFigure 5-10 and the following operation description.

1. With the circuit breaker closed and sufficient voltageon the Undervoltage Trip Device coil, the movingclapper (1) is held to the stationary yoke (2) by themagnetic force produced by the coil (3) against theextension springs (4) pulling the moving clapperapart from the yoke.

2. The moving clapper is connected to the mechanismTrip D Shaft Lever (5) by a slotted link (6).

3. When the voltage to the Undervoltage Trip Coil goesdown as described earlier, the extension springsforce overcomes the reduced magnetic force andpulls the moving clapper up. The slotted link in turnupsets the Trip D Shaft and the circuit breaker tripsopen.

4. As the circuit breaker opens, the reset lever (8) con-nected to the pole shaft lever (7) operates to resetthe moving clapper. As long as the circuit breakerremains open, the reset lever holds down the movingclapper to the yoke.

Event Milliseconds (maximum)

Closing Time(From Initiation of Close 75 Signal to Contact Make)

Opening Time(Initiation of Trip Signal 45to Contact Break)

Reclosing Time(Initiation of Trip Signal 190to Contact Make)

Table 5.1 Circuit Breaker Timing

Figure 5-8 Secondary Plug Shown Mounted Lower LeftDrawout Circuit Breaker

The switchgear compartment mounted secondaries areof a movable carriage design. Once the circuit breakeris in the TEST position, the structure mounted sec-ondary plug carriage can be manually unlatched andpulled forward until mating with the circuit breakermounted male plugs. To disengage the secondary plugsfrom the TEST position, simply push the carriage to therear. Secondary connections are automatically engagedor disengaged when moving into or out of the CON-NECTED position.

5-4.3 SECONDARY TERMINAL BLOCKS

W-VACR fixed circuit breakers are supplied with 2 12-point screw type secondary control terminal blocksfor simple secondary control access. A number of pointsare used for breaker operation with a number of sparecontacts for customer use. The terminal blocks arelocated at the lower front of the circuit breaker (5-9).Two additional terminal blocks are available for a sec-ond auxilliary switch.

5-4.4 UNDERVOLTAGE TRIP DEVICE

The undervoltage trip device for W-VAC and W-VACRcircuit breakers is an electromechanical device thatoperates to open the circuit breaker at 30% or less ofthe voltage rating of the trip coil. The device does notopen the circuit breaker at values above 60% of the volt-age rating of its trip coil. It may operate, however, toopen the circuit breaker when the voltage across the tripcoil is greater than 30%, but less than 60% of the volt-age rating of its trip coil. The circuit breaker can beclosed as long as the voltage to the trip coil is main-tained at 85% or above the rated level. The undervolt-age trip device is available only as an instantaneoustype with rated voltages of 48VDC, 125VDC, 250VDC120VAC and 240VAC.

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5. When the circuit breaker closes, the reset levermoves away from the moving clapper. If the Under-voltage Trip Device coil has at least 85% of the ratedvoltage applied, the moving clapper is held to theyoke by the magnetic force, even though the resetlever has moved up.

5-5 INTERLOCKS AND INTERFACING

Refer to Paragraph 4-9 of this manual for detailed infor-mation concerning circuit breaker interlocks and theirinterfacing with a switchgear structure compartment. Inaddition, refer to the instruction manual supplied withthe switchgear assembly. Customers are responsible forproviding W-VACR interfaces.

5-6 LEVERING MECHANISM (W-VAC ONLY)

The purpose of the levering mechanism is to move thedrawout W-VAC circuit breaker into and out of the CON-NECTED position within the assembly structure. Thelevering mechanism used to move the circuit breaker isa minimum effort recirculating ball drive design, and ispart of the assembly structure cradle. For additionalinformation concerning the levering mechanism, refer tothe instruction manual supplied with the switchgearassembly. Paragraph 4-8.1 of this manual providesdetails concerning the use of the levering mechanism tomove the circuit breaker into and out of the CONNECT-ED position within the assembly structure.

5-7 OPERATIONS COUNTER

All circuit breakers are equipped with a mechanicaloperations counter. As the circuit breaker opens, thelinkage connected to the pole shaft lever advances thecounter reading by one (Figure 3-8).

5-8 GROUND CONTACT

The ground contact used with the drawout W-VAC cir-cuit breaker is an assembly of spring loaded fingers pro-viding a disconnectable means for grounding the circuitbreaker chassis, after it has been inserted into aswitchgear structure. The ground contact is located onthe lower left portion of the truck chassis. An extensionof the switchgear ground bus is secured to the cell floorin such a position to engage the ground contact auto-matically, when the circuit breaker is moved into theDISCONNECT/TEST position. It remains engaged in allother circuit breaker positions within the cell. The leveris supplied on the W-VACR breaker, but the customer isresponsible for supplying the proper interface.

5-9 MOC AND TOC SWITCH OPERATIONS

A MOC operator integral to the circuit breaker engagesan operating lever of the Mechanism Operated CellSwitch (MOC) located in the switchgear cell. This MOCoperator permits the contacts of the MOC Switch to becorrelated with the circuit breaker’s contact position.

The cell mounted Truck Operated Cell Switch (TOC) isoperated by movement of the circuit breaker truck intoor out of the CONNECTED position with the W-VAConly.

Figure 5-9 Secondary Terminal Blocks Shown MountedBottom Front Fixed Circuit Breaker (Shown WithTerminal Blocks for Second Auxilliary Switch)

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2 3

7

8

4

6

1

5

2

5

6

4 8

73

2

1 Moving Clapper

Stationary Yoke

UV Trip Device Coil

Extension Springs

Trip D Shaft Lever

Slotted Link

Pole Shaft Lever

Reset Lever

Figure 5-10 Undervoltage Trip Device Configuration

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SECTION 6: INSPECTION, MAINTENANCEAND TROUBLESHOOTING

6-1 INTRODUCTION

• DO NOT WORK ON A CIRCUIT BREAKER IN THE“CONNECTED” POSITION.

• DO NOT WORK ON A CIRCUIT BREAKER WITHSECONDARY DISCONNECTS ENGAGED.

• DO NOT WORK ON A CIRCUIT BREAKER WITHSPRINGS CHARGED OR CONTACTS CLOSED.

• DO NOT DEFEAT ANY SAFETY INTERLOCKS.

• DO NOT LEAVE MAINTENANCE TOOL IN THESOCKET AFTER CHARGING THE CLOSINGSPRINGS.

• DO NOT STAND LESS THAN FOUR METERSAWAY FROM THE BREAKER WHEN TESTINGFOR VACUUM INTEGRITY.

FAILURE TO FOLLOW ANY OF THESE INSTRUC-TIONS MAY CAUSE DEATH, SERIOUS BODILYINJURY, OR PROPERTY DAMAGE. SEE SECTION 2-SAFE PRACTICES FOR MORE INFORMATION.

6-2 FREQUENCY OF INSPECTION ANDMAINTENANCE

Periodic inspections and associated maintenance areessential to the safe and reliable operation of W-VACand W-VACR Vacuum Circuit Breakers. The inspectionfrequency and associated maintenance recommendedare intended to insure the best possible ongoing ser-vice. It is imperative that an established schedule be fol-lowed. To establish an exact schedule for a specificinstallation, use the following guidelines:

1. In a clean, non-corrosive environment, inspect andmaintain each circuit breaker annually or every 500operations, which ever comes first.

2. For special conditions such as frequent circuit break-er operation, contaminated environments, and hightemperature/humidity conditions, the inspection fre-quency should be twice a year.

3. Inspect a circuit breaker every time it interrupts faultcurrent.

4. Follow the steps presented in Paragraph 6-3 entitled“Inspection and Maintenance Procedures” for sched-uled programs.

5. Create and maintain a dated permanent record of allinspections, maintenance performed, actions taken,observations made, and measurements taken. Notonly will this provide valuable historical information, itcan help to establish whether or not the presentschedule needs to be adjusted.

6. Perform ongoing visual inspections, when possible,of all equipment on a regular basis. Be alert for anaccumulation of dirt in and around the circuit break-ers, loose hardware or discolored insulation.

6-2.1 QUALIFIED PERSONNEL

For the purpose of operating switchgear equipment andassociated circuit breakers, only individuals thoroughlytrained in the operation of power circuit breakers andassociated equipment, and having knowledge of con-nected loads may be considered to be qualified. Referto further definitions in the National Electrical SafetyCode.

For the purpose of inspecting and maintaining suchequipment, a qualified person must also be trained inregard to the hazards inherent to working with electricityand the proper way to perform such work. Such an indi-vidual should be able to de-energize, clear and tag cir-cuits in accordance with established safety practices. Inaddition, these individuals should have access to and betrained in the use of protective equipment, such as rub-ber gloves and flash clothes.

All personnel should be familiar with and understand thematerial presented in this instruction manual and otherrelated manuals.

6-2.2 HELPFUL TOOLS AND ACCESSORY ITEMS

To simplify the performance of inspection and mainte-nance programs, the items described in Section 3-5 arerecommended.

6-2.3 GENERAL TORQUE GUIDELINES

Bolts and screws must be properly torqued. This isespecially true if parts and/or accessories are added orreplaced. Table 6.1 provides guidelines on torque lev-els. The table is intended as a general guideline and

! WARNING

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should be applied in conjunction with the experienceand good judgment of the individual performing thework.

OVER TORQUING CAN CAUSE PERMANENT DAM-AGE WHILE UNDER TORQUING WILL NOT PRO-VIDE THE PROPER CLAMPING FORCE AND MAYEVENTUALLY WORK LOOSE.

Table 6.1 Torque Guidelines

Bolt Size Torque (nm)

8 - 32 2.7

10 - 32 4

1/4 - 20 8

5/16 - 18 16

3/8 - 16 34

1/2 - 13 61

! CAUTION

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Figure 6-1 Lubrication Points (Drawout Circuit Breaker Shown)

● Apply one drop of lightmachine oil such asMobil One at locationsshown.

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6-3 INSPECTION AND MAINTENANCE PROCEDURES

No./Section Inspection Item Criteria Inspection Method Corrective Action

1. Insulation Drive Insulator No dirt Visual Check Clean with lint-free clothand and orMolded Pole Unit Support No cracking Visual Check Replace cracked unit

Insulation Main Circuit to Ground Withstand Hipot Tester Clean and retest or replaceIntegrity

Between Main Circuit Withstand Hipot Tester Clean and retest or replaceTerminals

Control Circuit to Ground Withstand Hipot Tester Clean and retest or replace

2. Power Vacuum Interrupters Precise Measure- Measurement - Close the circuit If the front indicator marks areElements ment from rear breaker and proceed as described in the red area and the rear

in Paragraph 6-5 measurement is not acceptable,replace pole unit assembly

Contact wipe Measurement of Loading Spring as If measurement is not acceptable, measurement described in Paragraph 6-6 replace pole unit assembly

Adequate Vacuum Proceed with integrity check as If integrity check is not satisfactory, described in Paragraph 6-4 replace pole unit assembly

Primary Disconnects No burning or damage Visual Check Replace if burned, damaged(W-VAC Only) or eroded

3. Control Closing and Tripping Device Smooth and correct Test closing and tripping of the Replace any defective device. Identify Circuit Including Disconnects operation by control circuit breaker twice per trouble-shooting chartParts power

Wiring Securely tied in Visual Check Repair or tie as necessaryproper place

Terminals Tight Visual Check Tighten or replace if necessary

Motor Smooth, Normal Functional Test Replace brushes or motorOperation

4. Operating Tightness of Hardware No loose or missing Visual and by feel Refer to Table 6.1 and tighten Mechanism parts or reinstate if necessary with

appropriate tools

Dust or Foreign Matter No dust or foreign Visual Check Clean as necessarymatter

Lubrication Smooth operation Sight, feel and per maintenance Refer to Figure 6-1, Paragraphand no excessive schedule 6-11 and lubricate very spar-wear ingly with light machine oil

Deformation or Excessive No excessive Visual and operational Remove cause and replace partsWear deformation or wear

Manual Operation Smooth operation Manual charging, closing Correct per troubleshooting and tripping chart if necessary

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In this case the equipment must be capable of delivering5 milliamperes for one minute to avoid ambiguity due tofield emission or leakage currents and the test voltageshall be as shown in Table 6.2.

The current delivery capability of 25 ma ac and 5 ma dcapply when all three VIs are tested in parallel. If individ-ual VIs are tested, current capability may be one third ofthese values.

SOME DC HIGH POTENTIAL UNITS, OPERATING ASUNFILTERED HALF-WAVE RECTIFIERS, ARE NOTSUITABLE FOR USE TO TEST VACUUM INTER-RUPTERS BECAUSE THE PEAK VOLTAGE AP-PEARING ACROSS THE INTERRUPTERS CAN BESUBSTANTIALLY GREATER THAN THE VALUEREAD ON THE METER.

6-5 CONTACT EROSION

In order to determine if the contacts have eroded to theextent that the interrupter must be replaced, close thecircuit breaker and observe the erosion mark on eachoperating rod from the rear of the circuit breaker. If themark on the interrupter stem is measured to be morethan 12 inches from the base of the interrupter, theinterrupter is satisfactory. If the mark is 12 inches orless, the interrupter assembly must be replaced (Figures6-2 and 6-3).

6-6 CONTACT WIPE

The adequacy of contact wipe can be determined by asimple measurement of each loading spring indicatorwith the circuit breaker closed. Refer to Figures 6-4 and6-5 and measure the indicator distance shown for eachinterrupter. If the measurement taken is in the range of23 to 31 mm, the contact wipe is adequate.

6-4 VACUUM INTERRUPTER INTEGRITY TEST

Vacuum interrupters used in Type W-VAC and W-VACR36kV Vac-uum Circuit Breakers are highly reliable inter-rupting elements. Satisfactory performance of thesedevices is dependent upon the integrity of the vacuum inthe interrupter and the internal dielectric strength. Bothof these parameters can be readily checked by a oneminute ac high potential test. Refer to Table 6.2 for theappropriate test voltage. During this test, the followingwarning must be observed:

APPLYING ABNORMALLY HIGH VOLTAGE ACROSSA PAIR OF CONTACTS IN VACUUM MAY PRODUCEX-RADIATION. THE RADIATION MAY INCREASEWITH THE INCREASE IN VOLTAGE AND/OR DE-CREASE IN CONTACT SPACING. X-RADIATIONPRODUCED DURING THIS TEST WITH RECOM-MENDED VOLTAGE AND NORMAL CONTACTSPACING IS EXTREMELY LOW AND WELL BELOWMAXIMUM PERMITTED BY STANDARDS. HOWEV-ER, AS A PRECAUTIONARY MEASURE AGAINSTPOSSIBILITY OF APPLICATION OF HIGHER THANRECOMMENDED VOLTAGE AND/OR BELOW NOR-MAL CONTACT SPACING, IT IS RECOMMENDEDTHAT ALL OPERATING PERSONNEL STAND ATLEAST FOUR METERS AWAY IN FRONT OF THECIRCUIT BREAKER.

With the circuit breaker open and sitting solidly on thefloor or secured in a fixed position, connect all top pri-mary studs (bars) together and to the high potentialmachine lead. Connect all bottom studs together andground them along with the circuit breaker frame. Startthe machine at zero potential, increase to appropriatetest voltage and maintain for one minute.

A successful withstand indicates that all interruptershave a satisfactory vacuum level. If there is a break-down, the defective interrupter or interrupters should beidentified by an individual test and replaced before plac-ing the circuit breaker in service.

After the high potential is removed, discharge any elec-trical charge that may be retained. To avoid any ambi-guity in the ac high potential test due to leakage or dis-placement (capacitive) current, the test unit should havesufficient volt-ampere capacity. It is recommended thatthe equipment be capable of delivering 25 milliamperesfor one minute.

Although an ac high potential test is recommended, a dctest may be performed if only a dc test unit is available.

Vacuum Interrupter Integrity Test Voltage

ac 60 Hz dc

36 kV rms 60 kV rms 85 kV

Circuit Breaker RatedMaximum Voltage

Table 6.2 Test Voltage

! WARNING! CAUTION

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Figure 6-2 Rear Measurement for Contact ErosionBeing Made (Circuit Breaker Closed) Figure 6-3 Graphical Representation of Contact Erosion

Measurement (Circuit Breaker Closed)

Base of Interrupter

Standard 300 mmMetal Scale

InchMeasurement Line

6-7 INSULATION

Type W-VAC and W-VACR 36kV Vacuum CircuitBreakers primarily utilize cycloaliphatic epoxy insulationexcept, for example, the black insulating shrouds.Insulation maintenance primarily consists of keeping allinsulating surfaces clean. This can be done by wipingoff all insulating surfaces with a dry lint free cloth or drypaper towel. In case there is any tightly adhering dirtthat will not come off by wiping, it can be removed with amild solvent or distilled water. Be sure that the surfacesare dry before placing the circuit breaker in service. If asolvent is required to cut dirt, use Stoddard’s SolventCutler-Hammer 55812CA or commercial equivalent.Second-ary control wiring requires inspection for tight-ness of all connections and damage to insulation.

6-8 INSULATION INTEGRITY CHECK

Primary Circuit:

The integrity of primary insulation may be checked bythe 50Hz AC high potential test. The test voltagedepends upon the maximum rated voltage of the circuitbreaker. For circuit breakers rated 36kV the test voltageis 60kV rms. Conduct the test as follows:

Close the circuit breaker. Connect the high potential

lead of the test machine to one of the poles of the circuitbreaker. Connect the remaining poles and circuit break-er frame to ground. Start the machine with output poten-tial at zero and increase to the test voltage. Maintain thetest voltage for one minute. Repeat for the remainingpoles. Successful withstand indicates satisfactory insu-lation strength of the primary circuit.

If a DC high potential machine is used, make certainthat the peak voltage does not exceed the peak of thecorresponding AC rms test voltage.

Secondary Circuit:

Connect all points of the secondary terminal block withshooting wire. Connect this wire to the high potentiallead of the test machine. Ground the circuit breakerframe. Starting with zero, increase the voltage to 1500volts rms. Maintain the voltage for one minute. Suc-cessful withstand indicates satisfactory insulationstrength of the secondary control circuit. Remove theshooting wire.

6-9 PRIMARY CIRCUIT RESISTANCE CHECK

Since the main contacts are inside the vacuum cham-ber, they remain clean and require no maintenance atany time. Unlike many typical circuit breaker designs,W-VAC and W-VACR circuit breakers do not have slid-

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CONTACT WIPE(23.1 mm to

31.0 mm)

Figure 6-4 Side View of Loading Spring Indicator(Circuit Breaker Closed)

Figure 6-5 Graphical Representation of Contact WipeMeasurement of Loading Spring Indicator (CircuitBreaker Closed)

Figure 6-6 Resistance Measurement Locations

MeasureResistance here(Do not measureacross contactfingers, only mainconductors)

(W-VAC) (W-VACR)

MeasureResistance at 2Identified Points

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NO VOLTAGE IS PRESENT BEFORE PROCEEDINGWITH THE TASK, AND ALWAYS FOLLOW GENER-ALLY ACCEPTED SAFETY PROCEDURES.

Safety Precautions: Read and understand theseinstructions before attempting any maintenance, repairor testing on the breaker. The user is cautioned toobserve all recommendations, warnings and cautionsrelating to the safety of personnel and equipment.

6-10.1 CLOSURE™ TEST

Introduction: The CloSureTM Test is a simple yet extreme-ly effective means to determine and monitor the ability ofthe mechanism to close the breaker contacts fully. It pro-vides a quantitative measure of the extra energy availablein terms of over travel in inches to close the breaker con-tacts to their full extent. It may be used periodically tomonitor the health of the mechanism.At times, circuit breakers are called upon to operateMOC switches (mechanism operated control switches)that place extra load upon the closing mechanism of thecircuit breaker. If this load is excessive, it can preventthe circuit breaker from closing fully. In such a case, itis important to determine that the circuit breaker will close fully. The CloSureTM Test provides this assurance.

General Information: The CloSureTM Test can be per-formed on the VCP-W, VCP-WR, VCPW-ND, DHP-VR, W-VACR, W-VAC, W-VACW and W-VACWR lines of vacu-um circuit breakers Refer to Table 6.3 for a list of circuitbreakers. If the CloSureTM travel obtained is as specified,the mechanism performance is satisfactory. If theCloSureTM travel does not conform as shown in Figure 6-14, contact Cutler-Hammer for further information. (SeeStep 13).

DO NOT ATTEMPT TO INSTALL OR PERFORMMAINTENANCE OR TESTS ON THE EQUIPMENTWHILE IT IS ENERGIZED. NEVER PUT YOURHANDS NEAR THE MECHANISM WHEN THE CIR-CUIT BREAKER IS IN THE CHARGED OR CLOSEDPOSITION. DEATH OR SEVERE PERSONALINJURY CAN RESULT FROM CONTACT WITHENERGIZED EQUIPMENT. ALWAYS VERIFY THAT

ing contacts at the moving stem either. Instead they usea highly reliable and unique flexible clamp design thateliminates the need for lubrication and inspection for wear.

If desired, the DC resistance of the primary circuit maybe measured as follows: close the circuit breaker, passat least 100 amps DC current through the circuit break-er. With a low resistance instrument, measure resis-tance across the studs on the circuit breaker for eachpole (Figure 6-6).The resistance should not exceed thevalues shown in Table 6.4.

6-10 MECHANISM CHECK

Make a careful visual inspection of the mechanism forany loose parts such as bolts, nuts, pins and rings.Check for excessive wear or damage to the circuitbreaker components. Operate the circuit breaker sever-al times manually and electrically. Check the closingand opening times to verify that they are in accordancewith the limits in Table 5.1.

Figure 6-7 Status Indicators (“A” shows the contact status indication and “B” shows the spring indication.)

Open

DischargedA

B

Figure 6-8 Starting Tape at Bottom of Cam

Figure 6-9 Wrapping Tape Up Around Cam

! WARNING

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The recommendations and information contained hereinare based on Cutler-Hammer experience and judgment,but should not be considered to be all-inclusive or cov-ering every application or circumstance which mayarise. If further information is required, you should consult Cutler-Hammer.

Testing Procedures: Assuming that the breaker issafely pulled out to the Test/Disconnect position in theenclosure or placed on the workbench, follow this proce-dure to perform the CloSureTM Test. For further instruc-tions on disconnecting the circuit breaker consultSection 4 of this manual. If the enclosure is equippedwith the MOC operating in the test position also, makecertain that the MOC is connected to operate.

Step 1 - On the front cover identify the status indicators.MAKE SURE THE CLOSING SPRING STATUS INDI-CATES “Discharged” AND THE MAIN CONTACTINDICATOR SHOWS “Open” (Figure 6-7).

Step 2 - Remove the circuit breaker front cover. Be sure to save the original fasteners for reassembly.

Step 3 - Cut a piece of one inch wide drafting/maskingtape approximately 8 to 10 inches long.

Step 4 - Place the tape around the cam starting from thebottom up. Make certain that the tape adheres well tothe cam surface. (See Figures 6-8, 6-9 and 6-10).

Step 5 - Mount the transparent CloSureTM Test Tool withtwo bolts and washers. Refer to Figures 6-21, 6-22 andTable 6.3 for appropriate mounting holes. Hand tightenthe bolts (Figures 6-11, 6-12, 6-21 and 6-22).

Step 6 - A Sanford® Sharpie® black fine point perma-nent marker, item no. 30001, is recommended for thisnext step. Place the marker tip in the proper hole (“C” ).Refer to Figure 6-21 and make a heavy mark on thetape as shown in Figure 6-14.

Step 7 - Charge the closing springs with the mainte-nance tool. Continue charging the closing springs until a “click” is heard and the status indicator shows“Charged” (Figure 6-13).

Step 8 - While holding the marker tip on the tape, closethe breaker (Figure 6-14).

Step 9 - Move the marker back and forth horizontallyapproximately 15o in both directions to create a line onthe tape that identifies the closed rest position (Figures6-15, 6-21 and 6-17).

Figure 6-11 Attaching CloSureTM Test Tool at Hole “A”

Figure 6-10 Attaching Tape Around to Back of Cam

A

Figure 6-12 Attaching CloSureTM Test Tool at HPole “B”

B

Figure 6-13 Manually Charging Closing Springs

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Step 10 - Remove the marker from hole “C” .

Step 11 - Push the “push to open” clapper to open thecircuit breaker.

Step 12 - Inspect the circuit breaker to assure it is in the

open position and the closing springs are discharged.Remove the transparent CloSureTM Tool. Remove thetape from the cam and stick the tape on the front rightside sheet of the circuit breaker. Record the date of thetest and the operations counter reading on the tape(Figures 6-18 and 6-19 and 6-20).

Figure 6-15 Top View of Cam and Marker Interface

Figure 6-16 Move Marker 15o to Right

Figure 6-14 Manually Closing Circuit Breaker with Marker in Hole “C”.

C

Cam

15o15o

Marker

ClosureTM Tool

Figure 6-18 Remove Marked Masking Tape from Cam

Figure 6-19 Place Tape on Right Side Panel ofBreaker

Figure 6-17 Move Marker 15o to Left

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Step 13 - Evaluate the CloSureTM” performance by com-paring the test tape with the illustrations in Figure 6-20.If the marking is similar to 6-20A, measure the over trav-el “x”: If “x” is greater than or equal to 0.6 inches, thecircuit breaker performance is satisfactory. If “x” is less than 0.6 inches or if the marking is similar to 6-20B or 6-20C, immediately contact the Product Integrity Center

for Technical Support at (412) 787-6518.

Step 14 - Remove the CloSureTM Tool. Reassemble thefront cover onto the circuit breaker. Return the circuit breaker to it’s original configuration and setup.

Figure 6-20 Illustrative Testing Tape Sample

Figure 6-21 Front View of CloSureTM Tool ShowingMounting/Testing Hole Locations (6352C49H01)

CA B

A-1

A-2

A-3A-4

B-1

B-2

C-2C-1 C-3 C-4 C-5 C-6

Dat

e, #

of B

reak

er O

pera

tions

, Clo

sure

TM

Dis

tanc

e

5 3/

16”

App

rox 5

3/16

” A

ppro

x

Dat

e, #

of B

reak

er O

pera

tions

, Clo

sure

TM

Dis

tanc

e

Dat

e, #

of B

reak

er O

pera

tions

, Clo

sure

TM

Dis

tanc

e

5 3/

16”

App

rox

CloSureTM Position

CloSureTM Distance

*Figure not to scale

*Note: Use the center of the marker diameter todetermine “X” distance

“X” InchesCloSureTM Overtravel

8.0 to 10Inches

Breaker Approximate Upper Lower MarkerLine Mechanism Mounting Mounting Placement

Cabinet Hole Hole HoleWidth (inch)

DHP-VR20 A1 B2 C2

27 A1 B1 C5

VCPW-ND 20/21 A1 B2 C2

VCP-W27 A1 B2 C5

33 A2 B2 C6

18 A1 B2 C1

VCP-WR 20 A1 B2 C2

27 A1 B2 C5

W-VAC,18 A1 B2 C1

W-VACR25 A1 B1 C4

33 A2 B2 C6

Figure 6-22 Typical Circuit Breaker Front View withCloSureTM Tool Attached (approximate mechanism chassis width)

Table 6.3 ClosureTM Tool Mounting/Testing Locations byCircuit Breaker Type

Width

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6-11 LUBRICATION

All parts that require lubrication have been lubricatedduring the assembly with molybdenum disulphidegrease (Cutler-Hammer Material No. 53701QB). Over aperiod of time, this lubricant may be pushed out of theway or degrade. Proper lubrication at regular intervals isessential for maintaining the reliable performance of themechanism. Once a year or every 500 operationswhichever comes first, the circuit breaker should berelubricated. The locations shown in Figure 6-1 shouldbe lubricated with a drop of light machine oil.

After lubrication, operate the circuit breaker severaltimes manually and electrically.

Roller bearings are used on the pole shaft, the camshaft, the main link and the motor eccentric. Thesebearings are packed at the factory with a top grade slowoxidizing grease which normally should be effective formany years. They should not be disturbed unless thereis definite evidence of sluggishness, dirt or parts are dis-mantled for some reason.

Rated ContinuousCurrent (amperes)

600A1200A1600A2000A

Resistance(microohms)

92908872

Table 6.4 Approximate Resistance Measurements

6-12 TROUBLESHOOTING CHART (Continued Next Page)

SYMPTOM INSPECTION AREA PROBABLE DEFECTS

Fails To Close

• Closing Springs not charged • Control Circuit • Control Power(fuse blown or switch off)

• Secondary Disconnects

• Motor Cut-off Switch(Poor or burned contacts,Lever not operational)

• Terminals and connectors(Poor or burned contacts)

• Motor(Brushes worn or commutatorsegment open)

• Mechanism • Pawls(Slipping or Broken)

• Ratchet Wheel(Teeth worn or broken)

• Cam Shaft Assembly(Sluggish or jammed)

• Oscillator(Reset spring off or broken)

If it becomes necessary to disassemble the mechanism,the bearings and related parts should be thoroughlycleaned. Remove old grease in a good grease solvent.Do not use carbon tetrachloride. They should then bewashed in light machine oil until the cleaner is removed.After the oil has been drawn off, the bearings should bepacked with Cutler-Hammer Grease 53701QB or equiv-alent.

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SYMPTOM INSPECTION AREA PROBABLE DEFECTS

6-12 TROUBLESHOOTING CHART (Continued Next Page)

Fails To Close

• Closing Spring charged but • No Closing Sound • Control Powercircuit breaker does not close (Close Coil does (Fuse blown or switch off)

not pick up)• Secondary Disconnects

• Anti-Pump Relay(Y relay N. C. contact open or burned or relay picks up)

• Close Coil(Open or burned)

• Latch Check Switch(Contact open-bad switch or trip bar not reset)

• Auxiliary Switch(b contact open or burned)

• Motor Cut-off(Contacts open or burned)

• Trip Coil Assembly(Clapper fails to reset)

• Closing Sound • Pole Shaftbut no close (Not open fully)

• Trip Latch Reset Spring(Damaged or Missing)

• Trip Bar-D Shaft(Fails to remain reset)

• Trip Latch-Hatchet(Fails to remain reset)

• Trip Floor Tripper(Fails to remain reset)

• Close Latch(Binding)

• Close Latch Roller(Binding)

• Trip Circuit Energized

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6-12 TROUBLESHOOTING CHART

Undesirably Closes

• Control Circuit • Close Circuit(CS/C Getting Shorted)

• Mechanism • Close Release Latch(Fails to reset)

• Close Floor Tripper(Fails to reset)

Fails To Trip

• No Trip Sound • Control Circuit • Control Power(Fuse blown or switch off)

• Secondary Disconnect

• Auxiliary Switch(a contact not making, poor or burned)

• Trip Coil(Burned or open)

• Terminals and Connections(Poor or burned or open)

• Trip Mechanism • Trip Clapper(Jammed)

• Trip Sound • Trip Mechanism • Trip Bar, Trip LatchBut No Trip (Jammed)

• Pole Shaft(Jammed)

• Operating Rod Assembly(Broken or pins out)

• Vacuum Interrupter(One or more welded)

Undesirably Trips

• Control Circuit • Control Power(CS/T Switch, remains made)

• Mechanism • Trip Coil Clapper(Not resetting)

• Trip Bar or Trip Latch(Poor engagement of mating or worn surfaces)

• Trip Bar Reset Spring(Loss of torque)

SYMPTOM INSPECTION AREA PROBABLE DEFECTS

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7-1.1 ORDERING INSTRUCTIONS

a. Always specify the breaker rating information andshop order number.

b. Describe the item, give the style number, and specifythe quantity required.

c. Specify the voltage for electrical components.d. Specify the method of shipping desirede. Send all orders or correspondence to the nearest

Cutler-Hammer sales office.

7.1 Recommended Renewal Parts for IEC Rated Breakers (Continued Next Page)

SECTION 7: RENEWAL PARTS

7-1 GENERAL

In order to minimize production downtime, it is recom-mended that an adequate quantity of spare parts be car-ried in stock. The quantity will vary from customer tocustomer, depending upon the service severity and con-tinuity requirements. Each customer should develop hisown stock level based on operating experience. Refer toTable 7.1 for guidance.

LINE DESCRIPTION STYLE NUMBER QTYNO. W-VAC and/or W-VACR

Interrupter Assembly W-VAC

1 360/16, 630A - 16kA 3A74837H01 32 360/16, 1250A - 16kA 3A74838H01 33 360/16, 1600A - 16kA 3A74839H01 3

W-VAC

4 360/16, 2000A - 16kA 3A74840H01 3

W-VACR

5 360/16, 630A - 16kA 3A74686H01 36 360/16, 1250A - 16kA 3A74686H02 37 360/16, 1600A - 16kA 3A74686H03 38 360/16, 2000A - 16kA 3A74686H04 3

W-VAC

9 360/20, 630A - 20kA 3A74807H01 3

10 360/20, 1250A - 20kA 3A74808H01 311 360/20, 1600A - 20kA 3A74809H01 3

W-VAC

12 360/20, 2000A - 20kA 3A74810H01 3

W-VACR

13 360/20, 630A - 20kA 3A74686H11 314 360/20, 1250A - 20kA 3A74686H12 315 360/20, 1600A - 20kA 3A74686H13 3

16 360/20, 2000A - 20kA 3A74686H14 3

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LINE DESCRIPTION STYLE NUMBER QTYNO. W-VAC and/or W-VACR

W-VAC

17 360/25, 630A - 25kA 3A74851H01 318 360/25, 1250A - 25kA 3A74852H01 319 360/25, 1600A - 25kA 3A74853H01 3

W-VAC

20 360/25, 2000A - 25kA 3A74854H01 3

W-VACR

21 360/25, 630A - 25kA 3A74686H21 322 360/25, 1250A - 25kA 3A74686H22 323 360/25, 1600A - 25kA 3A74686H23 324 360/25, 2000A - 25kA 3A74686H24 3

W-VAC

25 360/32, 630A - 31.5kA 3A74858H01 326 360/32, 1250A - 31.5kA 3A74859H01 327 360/32, 1600A - 31.5kA 3A74860H01 3

W-VAC

28 360/32, 2000A - 31.5kA 3A74861H01 3

W-VACR

29 360/32, 630A - 31.5kA 3A74686H31 330 360/32, 1250A - 31.5kA 3A74686H32 331 360/32, 1600A - 31.5kA 3A74686H33 332 360/32, 2000A - 31.5kA 3A74686H34 3

7.1 Recommended Renewal Parts for IEC Rated Breakers (Continued Next Page)

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7.1 Recommended Renewal Parts for IEC Rated Breakers (Continued Next Page)

LINE DESCRIPTION STYLE NUMBER QTYNO. W-VAC and/or W-VACR

33 48VDC 699B196G06 134 125VDC/120VAC 699B196G04 135 250VDC.240VAC 699B196G05 1

36 MOTOR BRUSH KIT 8063A77G01 1

Spring Release Coils

37 48VDC 3759A76G11 138 125VDC/120VAC 3759A76G12 139 250VDC/240VAC 3759A76G13 1

40 RECTIFIER (120/240VAC) 3759A76G02 1

Anti Pump (Y) Relay

41 48VDC 8237A27H03 142 125VDC 8237A27H04 143 250VDC 8237A27H05 144 120VAC 8237A27H01 145 240VAC 8237A27H02 1

Shunt Trip Coils

46 24VDC 3759A76G14 147 48VDC 3759A76G11 148 125VDC/125VAC Cap Trip 3759A76G12 149 250VDC/240VAC Cap Trip 3759A76G13 1

Primary Disconnects(W-VAC Only)

50 630A 5680B59G01 651 1250A 5680B60G01 652 1600A 5680B61G01 653 2000A 692C037G03 6

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7.1 Recommended Renewal Parts for IEC Rated Breakers (Continued Next Page)

LINE DESCRIPTION STYLE NUMBER QTYNO. W-VAC and/or W-VACR

UV Trip Coils

54 48VDC 8064A19G01 155 125VDC 8064A19G02 156 250VDC 8064A19G03 157 120VAC 8064A19G07 158 240VAC 8064A19G08 1

59 Motor Cutoff Switch 699B199G04 1

60 Latch Check Switch 699B147H04 1

61 Position Switch 699B147H01 162 Position Switch 3759A93H02 1

63 Auxiliary Switch 5697B20H01 1

64 Trip D-Shaft 694C638G01 1

65 Trip Latch (Hatchet) 699B040G03 1

Ground Contact Assy.(W-VAC Only)

66 16kA 8796C85G01 167 25kA 8796C85G02 168 31.5kA 8796C85G03 169 21/35kA 8796C85G04 1

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LINE DESCRIPTION STYLE NUMBER QTYNO. W-VAC and/or W-VACR

70 Shock Absorber 5677B26H01 2

71 Front Panel (w/o ESCN) 4D13655H02 1

72 Breaker Rail Wheel 5680B22G01 4

73 Shutter Drive Roller 5680B24H02 2

74 Breaker Floor Wheel 3A74342H01 4

75 Fastener Kit 8061A01G01 1

76 Labels Kit 8295A45G01 1

7.1 Recommended Renewal Parts for IEC Rated Breakers (Continued Next Page)

Closed Open

Discharged

Charged

Push toClose

Push toOpen

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LINE DESCRIPTION STYLE NUMBER QTYNO. VCP-W and/or VCP-WR

Wiring Harness

77 Repair Kit 8796C82G01 1

Complete Replacement

78 STD 8796C82G02 179 With #2 AUX SW 8798C82G03 1

Undervoltage Kit

80 48VDC 8794C81G01 181 125VDC 8794C81G02 182 250VDC 8794C81G03 183 120VAC 8794C81G04 184 240VAC 8794C81G05 1

7.1 Recommended Renewal Parts for ANSI Rated Breakers

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I.B. 3A74792H06

Cutler-HammerPittsburgh, PA 15220

Effective 3/01 (ISI)Style 3A74792H06Printed in U.S.A.

This instruction booklet is published solely for informa-tion purposes and should not be considered all inclu-sive. If further information is required, you should con-sult Cutler-Hammer.

Sale of product shown in this literature is subject toterms and conditions outlined in appropriate Cutler-Hammer selling policies or other contractual agreementbetween the parties. This literature is not intended toand does not enlarge or add to any such contract. Thesole source governing the rights and remedies of anypurchaser of this equipment is the contract between thepurchaser and Cutler-Hammer.

NO WARRANTIES, EXPRESSED OR IMPLIED,INCLUDING WARRANTIES OF FITNESS FOR A PAR-TICULAR PURPOSE OR MERCHANTABILITY, ORWARRANTIES ARISING FROM COURSE OF DEAL-ING OR USAGE OF TRADE, ARE MADE REGARDINGTHE INFORMATION, RECOMMENDATIONS ANDDESCRIPTIONS CONTAINED HEREIN. In no eventwill Cutler-Hammer be responsible to the purchaser oruser in contract, in tort (including negligence), strict lia-bility or otherwise for any special, indirect, incidental orconsequential damage or loss whatsoever, including butnot limited to damage or loss of use of equipment, plantor power system, cost of capital, loss of power, addition-al expenses in the use of existing power facilities, orclaims against the purchaser or user by its customersresulting from the use of the information, recommenda-tions and description contained herein.