section c: technical specifications for … · page 1 of 44 annexure- i section – c: technical...

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ANNEXURE- I SECTION – C: TECHNICAL SPECIFICATIONS FOR SUPPLY OF INDOOR 11 kV, AIR INSULATED, INTERNAL ARC CLASSIFIED VCB SWITCH BOARD

INDEX

S.No

Title Page No. 1.0 Scope 2 2.0 Scope of supply 2 2.1 Technical particulars of switch board (data by purchaser) 2 2.2 Submission of Drawings/Documents and Software 7 3.0 Project data and Conditions 8 4.0 List of applicable documents/drawings 9 5.0 Design and manufacturing/constructional requirements 13 5.1 Switchboard construction 13 5.2 Vacuum Circuit Breakers 17 5.3 Breaker indications and Push buttons 18 5.4 Functional requirements 18 5.5 Instrument transformers 21 5.6 Integral make proof earth switches 22 5.7 Equipment earthing 22 5.8 Meters 23 5.9 Indication lamps, Annunciator and Hooter 24

5.10 Selector switches and push buttons 26 5.11 Internal wiring 26 5.12 Terminal blocks 28 5.13 Protection Relay 28 5.14 Space heater 33 5.15 Switch and Sockets for hand lamp / Maintenance 34 5.16 Illuminating lamp 34 5.17 Caution and Danger Board 34 5.18 Name plates 35 5.19 Surface treatment and Painting 37 5.20 Inspection and testing 37 5.21 Drawings and Data submission 40 5.22 To be furnished along with the bid 40 5.23 To be furnished after award of contract 41 5.24 Acceptance Criteria 41 5.25 To be submitted prior to dispatch 41 5.26 Packing 41 5.27 Shipping 42 5.28 Handling and Storage 42 5.29 Quality Assurance 42 5.30 Progress reporting 42 5.31 Accessories 43 5.32 Spares 43 5.33 Preferred make of materials 43

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1.0 SCOPE 1.1 This specification covers the design, engineering, manufacture, assembly, inspection and

testing of Indoor, 11 kV, 1250A (Incomer, Bus coupler and Outgoing feeder), STC: 25 kA/3.0s, Air insulated, Internal Arc Classified (IAC – 25 kA/0.1s) Switch Board with draw out type Vacuum Circuit Breakers, 1250A Bus bar, Numerical relay and associated equipment at Manufacturer’s works, packing, transport, safe delivery and unloading at site complete with all accessories and spares as specified hereinafter and as required for safe, reliable and trouble free continuous commercial operation, in a manner acceptable to the Purchaser and generally complying with latest IEC: 62271-1/100/200 & IS: 13118.

1.2 It is not the intent to specify completely herein, all details of design, construction of

components and their material. However, the components and material selected shall be suitable for intensive power distribution service with high efficiency and necessitate minimum surveillance and maintenance. Materials and components not specifically stated in this specification and which are necessary for meeting the requirements of this specification, shall be included in the scope of supply. Whether called specifically or not, all accessories required for monitoring, control, protection, mechanical and electrical interlocks and logic requirements for the switchboards are deemed to be considered as part of the switchboard supplier’s scope of supply.

2.0 SCOPE OF SUPPLY The following Switch Board shall be supplied in line with this specification and Single

Line Diagram.

2.1. TECHNICAL PARTICULARS OF SWITCH BOARD (DATA BY PURCHASER)

a) Note: - (Below mentioned specification is for 11kV panel consists of two incomer,

one bus coupler and six transformer outgoing feeder, two spare feeders, totally 12 panels including link panel as per single line diagram. All the feeder panel width shall not be less than 800mm).

S.No Name of Switch Board Type of Feeders Qty 1) 11 kV Switch Board with

necessary hardware. Incomer 2 Nos. Bus Coupler 1 No. Transformer feeders 6 Nos. Outgoing spare feeders 2 Nos. Link panel 1 No.

2) Programming/configuration software and associated communication cords for numerical relays and meters

3) Spares requirement as per clause no: 5.32 of this specification

4) All relevant drawings, data and instruction manuals

5) A Set of special tools and tackles (if any) required for maintenance of switchgear and its components

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b) The panel shall be floor mounted. c) HV cable termination height from the gland plate in the cable compartment shall be

minimum 750 mm. If the supplier is unable to meet this requirement within the panel, then cable pans at bottom of the panel can be used for meeting the requirement.

d) All the control relays shall be model of MVAX, MVAJ & MVAA only.

S. No Parameter

Description

1 Particulars of the system i. System 3 Phase 3 Wire AC ii. Maximum system voltage/Rated

insulation voltage 12 kV

iii Rated operational voltage 11 kV iv. Type of neutral earthing Effectively earthed. v. Voltage variation ± 6.0 % vi. Frequency variation ± 3.0 % vii. System fault level 25 kA viii Maximum ambient air temperature 45°C ix Altitude Less than 1000 metres x Humidity 90% 2 General details i Type Fully arc proof

compartmentalized metal clad, air insulated, Flush fronted with fully draw out type Vacuum Circuit Breakers (VCB)

ii. Service condition Indoor iii Loss of Service Continuity (LSC) LSC 2B iv. Partition class Class PM v. Rated peak withstand current:

Main circuit & earth circuit As per IEC 62271 standard.

vi. Basic insulation level 12/28/75 kV vii. Rated supply voltage of closing and

opening devices and of auxiliary and control circuits:

a) Closing & Annunciation circuit

b) Tripping circuit 1&2 c) Relay & Indication circuit d) Remote Control circuit

110 V DC (Bus-1) 110 V DC (Bus-1 & 2) 110 V DC (Bus-2) 110 V DC (Bus-2) If DC bus-1 & 2 are healthy, supply should be feed independently. If anyone DC bus fails, the healthy Bus shall be feeded.

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viii. Rated supply voltage of metering 240 V AC, 50 Hz ix Rated supply voltage and frequency

of Spring charging motor 240 V AC, 50 Hz

x Rated supply voltage of Panel space heater, illuminating lamp, Modular shuttered socket with control switch

240 V AC, 50 Hz

xi Classification (IAC) Internal Arc current

AFLR minimum 25 kA rms for 0.1 second. All compartments in the supplied assembly shall meet the internal arc test requirements so as to comply the tender specifications.

3 MAIN BUS BAR & EARTH BUS BAR

i Bus bar material for main bus bar, from main bus bar to CB and CB to terminals

Electrolytic copper

ii Current density As per type tested design iii Rated continuous current 1250 A @ 50°C iv Short time rating 25 kA rms for 3.0 s. v Main Bus Bar, Joints and tap off

Sleeve There should not be any exposed conductive parts in the Bus Bar chamber, CB chamber and in the Cable chamber. All the exposed conductive parts including Main bus bars, joints and tap off in the Bus Bar chamber, CB chamber and in the Cable chamber shall be provided with heat shrinkable Sleeve rated for 11 kV. The joints and tap off shall be provided with flexible and easily removable (button type) sleeve with appropriate shape and size. FRP shrouds are not acceptable.

vi Bus identification Colour coded with coloured tapes and with dotted paints at regular / suitable locations

vii Temperature rise:

Temperature rise shall be as per IEC standard .

viii Auxiliary Bus Bar With suitable current carrying loop in loop out wires.

ix Auxiliary DC supply 110V DC x Auxiliary AC supply 240V AC, 50 Hz xi Hardware Hot dip GI xii Earth Bus bar Tinned Electrolytic Copper

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(50x6mm) xiii Rated short time withstand current

and its duration for earth bus 25 kA rms for 3sec.

xiv Power and Control cable entry From bottom

4 CIRCUIT BREAKER FOR ALL FEEDERS

i Number of poles 3 ii Service Indoor iii Rated insulation voltage 12 kV iv Power Frequency withstand voltage 28 kV rms v Lightning Impulse withstand voltage 75 kVp vi Rated symmetrical short circuit

breaking current 25 kA rms for 3.0 s.

vii Short Time Current rating 25 kA rms for 3.0 s. viii Desired duration of Short Circuit 3 s ix Asymmetrical Breaking Current 1.25 times rated symmetrical short

circuit breaking current x Rated Short circuit making current 2.5 times the rated symmetrical

short circuit breaking current as per IEC

xi Rated Current: a) In panel rating (Enclosed

switch gear rating) b) Out panel rating(Open switch

gear rating)

Shall be provided by the Supplier during drawing approval stage with appropriate design calculations. 1250 A @ 50°C

xii Transient Recovery voltage for terminal faults

As per IEC 62271

xiii Desired characteristics for short-line faults

As per IEC 62271

xiv Rated cable-charging breaking current

As per IEC 62271

xv Rated out-of-phase making and breaking current

As per IEC 62271

xvi Small inductive breaking current As per IEC 62271 xvii First Pole to clear factor 1.5 xviii Rated operating sequence O -0.3sec- CO - 3 min – CO xix Re-strike performance during

capacitive current switching Class C1

xx Frequency of mechanical operations Class M2 xxi Characteristic for electrical

endurance Class E2 (without auto re-closing duty)

xxii CB Operating Mechanism Motor operating stored-energy mechanism

xxiii Motor Operating Mechanism 250 V AC, 50 Hz xxiv Required Number shunt releases 2 Nos.

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(tripping coils/solenoid) xxv Operation Time: a) Break time: Not more than 4 cycles b) Make time: Not more than 5 cycles c) Range of DC Auxiliary Voltage: c.i. Closing solenoid 85% to 110% of 110 V DC c.ii Tripping solenoids:

a) 1st shunt release b) 2nd shunt release

70% to 110% of 110 V DC 70% to 110% of 110 V DC

c.iii Range of AC Auxiliary Voltage for Spring charging motor

85% to 110% of 250 V AC, 50 Hz

c.iv No. of spare aux. contacts of Breaker for Owner’s use

Number of auxiliary contacts of the CB shall be similar to the type tested design. Remaining spare contacts after using the contacts for schemes ( like tripping, closing, indication etc.,)

c.v No. of spare aux. contacts of Service and Test position limit switch

2 NO

5 INSTRUMENT TRANSFORMERS

i. Current Transformers: Cast Resin, Wound / Bar primary type with class ‘B’ or better

(a) Core-1 Metering - CTR 600-300/5A (for Incomer & Bus

coupler feeders) 150/5A (for Transformer & Spare feeders)

- Accuracy class & ISF 1.0 & < 10 - HSV & IL 12kV & 12/28/75kV - Burden 10 VA - STC 25 kA/ 3 sec

(b) Core-2 Protection - CTR 600-300/5A ( for Incomer & Bus

coupler feeders) 150/5A (for Transformer & Spare feeders)

- Accuracy class 5P20 - Burden 10VA - HSV & IL 12kV & 12/28/75kV - STC 25 kA/ 3 sec

ii. Voltage transformers: Cast Resin, Draw out type, single phase units. It shall be located in CB trolley of Incomer feeders

Secondary - VTR 11kV/√3 /110 V/√3/110V/3 -Protection 3P

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2.2 Submission of Drawings/Documents and Software The drawings and documents shall be submitted as per table below:

-Metering 1.0 - Burden Adequate for the Protection &

Instruments supplied. Detailed calculations shall be provided and the same shall be approved on an appropriate stage.

- No. of phases 3 - Method of connection Star/Star and Open delta with

damping resistor - Rated Voltage Factor 1.2 continuous, 1.9 for 30 s. - Class of insulation Class ‘B’ or better - Primary and Secondary fuses HRC current limiting type.

Primary fuse replacement shall be possible with PT in withdrawn position

- Damping resistor at PT tertiary

Shall be provided with adequate rating

HV Fuses: - Voltage Class 11 kV - Rated Current As per application - Rupturing capacity As per application - PT fuse failure Monitoring relay shall be

provided 6 Multifunction meter: Three phase four wire, 50 Hz

multi-function meters with accuracy class: 1.0 shall be suitable for incomer, bus coupler and transformer and outgoing spare feeder panels, auxiliary supply with RS485 or RJ45port

7 Protective relays: As mentioned in clause no:5.13 8 Switches: Lockable Local/Remote selector

switch TNC Switch UP stream CB trip / close (for incomers)

9 Cable entry details Cable Glands, Termination kits are not in supplier scope of supply.

Bottom

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S.No Drawings and Documents Along with Offer

For Approval after Award of Contract

Final after Approval

1) GTP (Signed with date seal) 1 copy

3 copies 4 copies + 2 Nos. of soft copy on CD/ DVD for documents/ drawings and software for Numerical relays and MFMs.

2) GA / Foundation drawings 3 copies 3) Power & Control drawings ------ 3 copies 4) Hard bound Catalogues & Manuals of

Switch Board, CB, Relays, Meters and all bought out items.

------ 3 copies

5) Required software for the Numerical relays and MFMs

------ ------

6) Installation, testing and commissioning instruction manual

------ ------

7) Type Test, Acceptance test and Routine test reports conducted on the Switch board.

1 copy ------

3.0 PROJECT DATA AND CONDITIONS

1) Project title : IGCAR 2) Location : Kalpakkam, 68 km from South of Chennai on the coast of Bayof Bengal. 3) Nearest Rail head : Chengalpet (32 km from Kalpakkam) 4) Nearest NH : NH-45 passing thorough Chengalpet 5) Nearest Port : Chennai, 68km from Kalpakkam 6) Ambient conditions : a) Max. dry bulb temp. : 43.6°C b) Min. dry bulb temp. : 17.6°C c) Design ambient temperature for indoor switchgear

and control gear : 40.0°C 7) Relative Humidity : a) Maximum : 95 % b) Minimum : 15 % c) At design ambient temp. : 95 % 8) Air Quality : Atmospheric air is sand and salt laden 9) Auxiliary power supplies : a) Construction power supply : 415 V, 3 Phase 4 wire 50 Hz AC.

b) Panel Lighting fixtures and Space heaters : 240 V, Single Phase 2 wire neutral earthed 50 Hz AC. c) Instrumentation, Controls and annunciation : 110 V DC, 2 wire ungrounded power supply 10) Variations in auxiliary

power supplies :

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a) 415 V power supply : -15 % +10 % b) Supply frequency : - 5% + 3 % c) Combined voltage and frequency variation : -15 % +10 % d) 110V DC power supply : -15 % +10 % The Supplier may note that the severe climatic condition existing in the region with co-incident humidity, salt and sand laden atmosphere and the temperature conducive to rust and fungus growth.

4.0 LIST OF APPLICABLE DOCUMENTS/DRAWINGS 4.1 Codes and standards

The design, material, construction, manufacture, inspection, testing and performance of the 11 kV Switch Board offered shall comply with all currently/latest applicable standards (including amendments thereto), regulations and safety codes in the locality where the equipments will be installed. Nothing in this specification shall be construed to relieve the Supplier of his responsibility. Where no standards are available, the supply items shall be of good quality and workmanship and backed by test results. Any supply items which are bought out by the Supplier shall be procured from those MANUFACTURERS approved by the PURCHASER. In case of conflict between the standards, stringent specifications out of these standards shall govern, whereas in case of conflict between the standards and this specification, requirements of this specification shall govern. Other National Standards are acceptable if they are established to be equivalent to or superior to the listed standards. In all such cases, however, copies of English version of such National standards shall be attached with the tender. The tenders not complying with this requirement are liable for rejection. S.No. Code Description

1) ISO:9001 Quality systems – Model for quality assurance in design/development, production, installation and servicing.

2) IS: 12729 Common Specification for High-Voltage Switchgear and Control gear Standards

3) IS: 12063 Classification of degrees of protection provided by enclosures of electrical equipment

4) IS: 9046 AC contactors of voltage above 1000V up to and including 11000 V

5) IS: 3427 AC Metal enclosed switch gear and control gear for rated voltages above 1000 V up to and including 52 kV.

6) IS: 13118 Specification for High Voltage AC circuit breakers 7) IS: 13947 Specification for Low Voltage switch gear and

control gear

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8) IS: 8084 Interconnecting bus bars for AC voltage above 1000 V up to and including 36 kV

9) IS:3156 Part -1 to 3 Voltage Transformers 10) IS:2705 Part -1 to 4 Current Transformers 11) IS: 4201 Application Guide for Current Transformers 12) IS: 4146 Application guide for Voltage Transformers 13) IS: 6949 Summation Current Transformers 14) IS: 3231 Part -1 to 3 Electrical relays for power system protection 15) IS: 3842 Part -1 to

12 Application guide for electrical relays for ac systems

16) IS: 8686 Static protective relays 17) IS: 8714 Electrical protective relays for use in seismic areas 18) IS: 5578 Guide for marking insulated conductors 19) IS: 2544 Porcelain post insulators for systems with nominal

voltages greater than 1000 V 20) IS: 13703 Low voltage fuses for voltages not exceeding 1000 V

AC or 1500 V DC 21) IS: 9385 Part -1 to 5 High Voltage fuses 22) IS: 10118 Part -1 to

4 Code of practice for selection, installation and maintenance of switch gear and control gear

23) IS: 11353 Guide for uniform system of marking and identification of conductors and apparatus terminals

24) IS: 5082 Wrought aluminum and aluminum alloys, bars, rods, tubes and sections for electrical purposes

25) IS: 2629 Recommended practice for hot dip galvanizing of iron and steel

26) IS: 1248 Direct acting indicating analogue electrical measuring instruments and their accessories

27) IS: 722 AC Electrical meters 28) IS: 1897 Copper strip for Electrical purposes 29) IS: 613 Copper rods and bars for electrical purposes 30) IS: 14570 Electrical measuring transducers converting AC

Electrical quantities into DC quantities 31) IS: 12784 Electrical measuring transducers converting AC

Electrical quantities into analog/digital signals 32) IS: 14700 Electro Magnetic Compatibility 33) IS: 694 PVC insulated cables for working voltages up to and

including 1100 V 34) IS: 9000 Basic environmental testing procedure for electronic

and electrical items

35) IS: 10601 Dimensions of terminals of high voltage switchgear and control gear

36) IS: 8084 Interconnecting bus bars for ac voltage above 1 kV up to and including 36 kV

37) IS: 13010 AC Watt-hour Meters, Class 0.5, 1 and 2 - Specification

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38) IS: 8623 Specification for Low-Voltage Switchgear and Control gear Assemblies

39) IS: 5 Colours for Ready Mixed Paints and Enamels 40) IS: 9920 Part-1 to 4 High Voltage Switches - Switches for rated Voltages

above 1 kV and less than 52 kV 41) IS: 2551 Danger notice plates 42) IS: 3043 Code of practice for earthing 43) IS: 8923 Warning symbol for dangerous voltages 44) IS: 5834 Part -1 to 3 Electrical Timer Relays for Industrial Purposes 45) IS: 3070 Part -3 Lightning Arresters for Alternating Current Systems

- Specification - Metal Oxide Lightning Arresters Without Gaps

46) Indian Electricity Rules 1956

Latest edition

47) Indian Electricity Act

Latest edition

International Standards

1) IEC: 62271 - 1 High-voltage switchgear and control gear - Common specifications.

2) IEC: 62271 - 3 High-voltage switchgear and control gear - Digital interfaces based on IEC: 61850.

3) IEC: 62271 - 100 High-voltage switchgear and control gear - Alternating current circuit-breakers.

4) IEC: 62271 - 102 Alternating current Dis-connectors and Earthing switches.

5) IEC: 62271 - 200 High-voltage switchgear and control gear - AC metal-enclosed switchgear and control gear for rated voltages above 1 kV and up to and including 52 kV.

6) IEC: 62271 - 206 High-voltage switchgear and control gear - Voltage presence indicating systems for rated voltages above 1 kV and up to and including 52 kV.

7) IEC: 62271 - 210 High-voltage switchgear and control gear - Seismic qualification for metal enclosed and solid-insulation enclosed switchgear and control gear assemblies for rated voltages above 1 kV and up to and including 52 kV.

8) IEC: 62271 - 300 High-voltage switchgear and control gear - Seismic qualification of alternating current circuit-breakers.

9) IEC: 62271 - 301 High-voltage switchgear and control gear - Dimensional standardization of high-voltage terminals.

10) IEC: 62271 - 302 Guide for short circuit and switching test procedures for metal enclosed and dead tank circuit breakers.

11) IEC: 62271 - 304 High-voltage switchgear and control gear - Design classes for indoor enclosed switchgear and control gear for rated voltages above 1 kV up to and

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including 52 kV to be used in severe climatic conditions.

12) IEC: 62271 - 308 Guide for asymmetrical short circuit breaking test duty

13) IEC: 61850 - 7 - 4 Communication networks and systems for power utility automation - Basic communication structure - Compatible logical node classes and data object classes.

14) IEC: 61869 - 1 General requirements for instrument transformers 15) IEC: 61869 - 2 Additional requirements for current transformers 16) IEC: 61869 - 3 Inductive Voltage Transformers 17) IEC: 60529 Classification of degrees of protection provided by

enclosures 18) IEC: 60137 Insulating bushings for alternating voltages above

1000V 19) IEC: 60815 Guide for the selection and dimensioning of high-

voltage insulators for polluted conditions 20) IEC: 60038 Standard Voltages 21) IEC: 60255 Measuring relays and protection equipment - Part 24:

Common format for transient data exchange (COMTRADE) for power systems.

22) IEC: 61131 Programmable Controllers - General information. 23) IEC: 61243-1

Live working - Voltage detectors: Capacitive type to be used for voltages exceeding 1 kV a.c.

24) IEC: 61243-2 Live working - Voltage detectors - Resistive type to be used for voltages of 1 kV to 36 kV a.c.

25) IEC: 60932 Additional requirements for enclosed switchgear and control gear from 1 kV to 72.5 kV to be used in severe climatic conditions.

26) IEC: 62262 Degrees of protection provided by enclosures for electrical equipment against external mechanical impacts (IK code).

4.2 Drawing: As per Annexure- III

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5.0 DESIGN AND MANUFACTURING/CONSTRUCTIONAL

REQUIREMENTS Equipment Description Requirements

5.1 SWITCH BOARD CONSTRUCTION

5.1.1 Service Indoor 5.1.2 Service condition Polluted level - Class 1 5.1.3 Construction Fully internal arc tested (AFLR),

Compartmentalized, Metal clad, vermin proof, Free standing, Floor mounting, Flush fronted with fully draw out type Vacuum Circuit Breakers, consisting of separate panels assembled into one or more sections to form a single structure with an air insulated common bus bar assembly generally complying with latest IEC: 62271-1/100/200 & IS: 13118. Exact dimensions of the panels will be approved during approval stage. Dimensions of the panels shall be as per type tested design of the panels.

5.1.4 Lifting arrangement The design of the switch board shall be such that no permanent harmful distortion occurs either when being lifted by eyebolts or when moved into position by rollers.

5.1.5 Necessary hardware for embedment in the base frame assembly/RCC ironite floor foundation

Shall be provided along with panel as per manufacturer’s standard installation plan. The foundation and installation details along with the drawing shall be submitted after award of contract during the time of drawing approval.

5.1.6 Internal Arc Classification (IAC)

Switch Board shall be qualified as Internal Arc Classified (IAC – AFLR) with respect to personnel protection in the event of an internal arc. Switch Board shall have passed internal arc faulted containment testing for each compartment for 0.1 second at the rated fault current 25 kA rms. Panel shall be type tested as per IEC 62271-200 Ed 2.0 - 2011 Annexure-A.

1) Safe for access from all sides i.e. AFLR 2) Current : Same as STC withstand 3) All five test criteria met.

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4) All three compartments tested: Circuit Breaker, Bus bar & Cable compartments. Tested on the same cubicle.

5) Tested with room simulation as per above IEC.

6) Panel subjected to Type tests should be from the same works as offered

5.1.7 Pressure Relief Devices / Pressure Discharge flaps

Bus bar compartment shall be fitted with a flap on its top surface. The pressure generated by the internal fault shall make it open, allowing the gas to pass out. If applicable, Suitable arc gas exhaust channel/duct with required vermin proof arrangement as per the manufacturer’s type tested design shall be positioned above the switchgear and/or shall run along its whole length.

5.1.8 Vermin proof arrangement Switchboard shall be totally enclosed and vermin proof. If necessary, openings for natural ventilation such as louvers and ventilation box shall be provided with stainless steel wire mesh from inside.

5.1.9 Degree of protection of enclosure (IP Class)

IP 2X for the partition between compartments IP 4X for switchboard.

5.1.10 Gaskets to be provided For CB compartment , LT compartment and Cable compartment doors (based on the manufacturer design requirement)

5.1.11 Front access Hinged door 5.1.12 Rear access Removable bolted cover with rear door safety

feature (Limit switch and castle key safety interlock) for all panels including link panel etc.

5.1.13 Material for Enclosure and internal partitioning

Standard pre-fabricated, CRCA sheet steel / High quality Aluminium-Zinc (Aluzinc) coated sheet steel. Fabrication shall be done through CNC turret press and CNC bending machine.

5.1.14 Load bearing members 2.0 mm thick with stiffeners 5.1.15 Doors and covers 2.0 mm thick 5.1.16 Gland plate 3.0 mm MS (detachable type with gasket). The

location of cable entry shall be marked in the gland plate by suitable means.

5.1.17 Width of panel 800mm 5.1.18 Depth of panel As per type tested design. 5.1.19 Height of panel As per type tested design. Data shall be

provided with and without arc gas duct. 5.1.20 Front/Rear/Lateral/Top

clearance Shall be indicated in front view drawing and the drawing shall be submitted.

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5.1.21 Separate compartments for Bus Bar, Circuit Breaker, Cable and LV Instruments.

5.1.22 Main Bus Bar Compartment Shall be as per manufacturer’s type tested design. The bus bar compartment shall run from end to end without any inter panel barriers so as in the event of internal arc inside the bus bar compartment, the arc will travel along the length of the switchboard. (or) The bus bar compartment shall be segregated from each other by metallic partitions and the bus bar shall run through seal off epoxy bushings.

5.1.23 Accessing arrangement to bus bars

Wherever maintenance is envisaged such as tightening of bus bar joints, the design shall allow access for the same with tools. Bus bars shall be accessible either from rear or front or from top for maintenance purpose.

5.1.24 Panel Housing Panel housing shall be made from the OEM/Switch board manufacturer only.

5.1.25 Breaker compartment door Separate, with lockable handle. (Design with breaker trolley as the front cover is not acceptable).

5.1.26 Cable compartment Cable termination compartment shall be suitable for terminating 2R x 11 kV (E), 3C x 400 sq.mm armored Cable using “Raychem/3M” make heat shrinkable end termination kit with safe and adequate working clearance.

5.1.27 Power cable entry from Rear bottom 5.1.28 Control cable entry from Front bottom. There shall be a possibility of

terminating to LV compartment from both right hand and left hand side. Control cable entry in LV compartment shall be through earthed metallic compartment/trough segregated from HV compartment or as per the manufacturer standard design.

5.1.29 Bus support insulator Non-hygroscopic, track resistant, high strength Epoxy insulators.

5.1.30 Fixing arrangement: a) Doors

b) Covers

Concealed hinged. Door greater than 500 mm shall have minimum three sets of hinges. Bolted with SS bolts. However, bus bar jointing bolts shall be as per manufacturer standard.

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c) Gaskets XLPE/Neoprene 5.1.31 Alignment with existing

board None

5.1.32 Extendibility Must be readily extendable in either direction 5.1.33 Handle for cable and bus bar

compartment covers Removable bolted covers for cable and bus bar compartment shall be provided with “C” type stainless steel (since coastal area) handles with gripper.

5.1.34 Mimic diagram on front of the switch board

Shall be provided.

5.1.35 BUS BARS 5.1.35.1 No. of phases Three phase bus bars which shall extend

through all the units of the switchgear line up. 5.1.35.2 Material of bus bars Electrolytic copper with silver-plating on joints

to a thickness of 4-5 microns. 5.1.35.3 Current density of bus bar As per type tested design 5.1.35.4 Size of bus bars Shall be uniform cross section throughout the

switchgear and shall be sized to carry continuously the current specified with respect to site conditions.

5.1.35.5 Phase identification Shall be prominently marked with colored tape or by suitable means.

5.1.35.6 Clearance between bus bars Clearance between the live bus bar and the nearest earth partition / member shall be suitably arranged so as to withstand power frequency and impulse withstand voltage as specified in IEC: 62271-100/200 or other relevant standards.

5.1.35.7 Insulation sleeve of all exposed parts in the Bus bar chamber, CB chamber and Cable chamber including main bus bar, joints and tap offs

Shall be provided with heat shrinkable insulation tube of adequate thickness to withstand maximum system voltage (12 kV). All joints shall be shrouded by flexible easily removable type (button type) insulation material for maximum system voltage. Sleeves shall be high resistance to arcing and tracking. Sleeves should be designed in such a way that it should have proper heat dissipation so that running temperature of the insulated bus bar does not exceed that of bare bus bar. Shall be flame retardant and non-halogen based material reduces flammability and the toxic and corrosive effects in fire situations.

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FRP/PVC shrouds/Mono-plast compound/HT Tape shall not be used at joints/tap offs.

5.2 VACUUM CIRCUIT

BREAKERS

5.2.1 Interrupting medium Vacuum 5.2.2 Type Horizontal draw out type VCB. Truck or

carriage or roll on floor type. VCB shall be the same make as the switchboard.

5.2.3 Vacuum Interrupter Manufacturer of VCB’s shall use the Vacuum Interrupters as per the preferred makes mentioned in the specification so that the drive mechanism shall match perfectly with that of the requirement of Vacuum Interrupter.

5.2.4 Mounting On withdraw able truck or carriage or rolling floor type with locking facility in service position.

5.2.5 Switching duty a) Transformer (both oil filled and dry type).

b) Underground Al. conductor XLPE cables.

5.2.6 Breaker operation Three separate identical single pole units operated through the common shaft.

5.2.7 Operating mechanism a) All the operations of VCB shall be with front door closed.

b) Re-strike free, trip free with electrical anti pumping feature. Anti-pumping auxiliary contactor shall be integral part of VCB operating mechanism itself.

c) One O-C-O operation possible after failure of power supply to the spring charging motor.

d) Motorized spring charging, stored energy type with manual spring charging facility using suitably insulated handle.

e) Suitable mechanical de-latching facility shall be provided for the spring charging mechanism so that in the event of failure of spring charge limit switch, the drive mechanism shall get automatically de-coupled.

5.2.8 Breaker control On panel front as well as from remote location

5.2.9 Breaker positions Service, Test and Isolated

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5.2.10 Interchangeability Possible, only with breaker of same rating 5.2.11 Breaker Handle Breaker shall be provided with handles for

easy handling, rack in-out operation and manual spring charging as applicable.

5.2.12 Operating instructions Shall be fixed on the CB chamber cover. 5.2.13 VCB & link panel Transport

trolley (if applicable) Shall be provided for inserting/withdrawing from VCB & link from cubicle and also for transporting VCB & link and the same is not applicable for floor rolling VCB & link truck.

5.3 Breaker Indications and Push buttons:

5.3.1 ON/OFF/Emergency trip push button

a) Manual/Mechanical b) Emergency Off push button will be

provided with a protective flap c) Mechanical ON shall have pad locking

facility 5.3.2 Mechanical ON/OFF indication On Breaker trolley front 5.3.3 Operation Counter On Breaker trolley front 5.3.4 Test, Service position indicator On Breaker trolley front 5.3.5 Spring charging mechanism

charge/discharge indicator On Breaker trolley front

5.4 FUNCTIONAL REQUIREMENTS 5.4.1 MECHANICAL & ELECTRICAL SAFETY INTERLOCKS: 5.4.1.1 Breaker operations like rack in

to service position and closing or rack out to test position for testing can be carried out inside the breaker compartment

Should be possible only with the breaker compartment door closed to ensure the integrity of the arc fault containment requirement.

5.4.1.2 Any attempt to rack out circuit breaker from service to test position

Shall not result in switching OFF of the CB instead the breaker service position shall be locked till VCB is “ON”.

5.4.1.3 Racking mechanism safety interlock

Mechanical type.

5.4.1.4 Breaker compartment door opening

Cannot be opened unless breaker is in ‘OFF’ condition and racked out to test/isolated position.

5.4.1.5 Breaker compartment door closing

Should be possible even when breaker in isolated position.

5.4.1.6 Manual or Electrical closing of breaker to be inhibited

When breaker in intermediate positions between service, test and isolated positions

5.4.1.7 Racking in or out of breaker to be inhibited

When breaker is closed.

5.4.1.8 Racking in the breaker to be inhibited

Unless the control plug is fully engaged.

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5.4.1.9 Disconnection of the control plug to be inhibited

As long as the breaker in service position.

5.4.1.10 Closing of CB in service position to be inhibited

If the control plug is not in its position.

5.4.1.11 Racking in of breaker to be prevented

When the relative earthing switch is closed

5.4.1.12 Defeat interlock mechanism It shall not be possible to rack in or rack out of CB carriage/truck when the front CB compartment door is in open condition. However, a suitable defeat interlock mechanism shall be provided for emergency purpose.

5.4.1.13 Two (2) out of Three (3) logic between two (2) incomers and one (1) bus couplers with by-passing scheme.

To be provided by both the Mechanical & Electrical interlock.

5.4.1.14 Link panel & bus coupler safety interlock/inter-trip.

Shall be provided by both the mechanical and electrical interlock/inter-trip for safe operation of link truck, rear cover opening etc.

5.4.1.15 Integral earthing switch in all feeders

Shall be provided and interlocked with circuit breakers to prevent incorrect operation. Adequate number of auxiliary contacts shall be provided for indication, electrical interlocks with upstream and its own CBs.

5.4.2 Interlocks between Upstream (Source end) and Downstream (Receiving end i.e, incomer) CBs:

5.4.2.1 When Upstream end CB trips on fault or manually

Then receiving end CB shall also trip.

5.4.2.2 Closing of Downstream CB can be possible

Only when Upstream CB is in ON condition.

5.4.2.3 Closing of Downstream CB to be inhibited in service position

When Upstream CB is in OFF condition.

5.4.2.4 Closing Of Upstream CB can be possible.

When Downstream CB is in OFF condition.

5.4.2.5 Closing of Earth switch at Downstream end to be inhibited.

When Upstream end CB is in ON condition & the Downstream end CB is in its test position.

5.4.2.6 Manual tripping of Upstream CB can be possible.

From Downstream end.

5.4.2.7 Closing of Upstream end CB to be inhibited.

From Downstream end. (closing permissive from downstream)

5.4.3 Additional requirement: 5.4.3.1 Exposure to live parts In case the breaker panel door is required to

be opened during a contingency, the

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personnel should not be exposed to any live part. Flexible shrouds / barriers / insulating sleeves should be provided as required.

5.4.3.2 Breaker handling In case the breaker is mounted on the trolley on a carriage which does not naturally roll out on the floor, a trolley for handling the breaker is to be provided. One trolley per switch board is to be included in the offer.

5.4.3.3 Requirement of breaker either in service or test position:

(a) Closing from local / remote selector switch

Only when local / remote selector switch is in respective position.

(b) Tripping of breaker When local/remote selector switch is in local / remote position, breaker can be tripped in local via TNC switch (Electrical), Trip push button (Mechanical), and emergency push button and from remote via SCADA trip signal.

(c) Testing of breaker Possible in test or isolated position keeping control plug connected

5.4.3.4 Safety Shutter: (a) Automatic safety metallic

shutters To fully cover contacts when breaker is withdrawn to test position. Shutters shall be automatically opened or closed by the mechanical drive of the circuit breaker. (b) Operation of safety shutters Independent operating mechanism for bus bar and cable side shutters with individual padlocking facilities in closed position.

(c) Label for identification For Bus side and Cable side shutters. (d) Warning label on shutters of

incoming and other connections

Clearly visible warning label “isolate elsewhere before earthing” shall be provided.

5.4.3.5 Breaker Electrical Operation Features:

(a) Trip circuit supervision To be given for breaker close and open condition.

(b) Trip circuit supervision relay contact

For indication, alarm and to inhibit closing of breaker.

(c) Master relay trip contact Wired to inhibit closing of breaker. (d) Emergency trip push button

contact a) Wired directly to trip coil. (Wired to master trip relay if second trip coil is provided) b) Wired to inhibit closing of breaker.

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5.4.3.6 Auxiliary Power Supplies (a) DC control supply 110V DC bus-1&2 with Auto-Change over

facility. DC supply will be provided from external DC source.

(b) PT supply Fed normally by incomer line PT with change over facility. PT change over interlock with incomer CB service contacts shall be provided.

5.5 INSTRUMENT TRANSFORMERS: 5.5.1 CURRENT

TRANSFORMERS (CT): Shall be epoxy cast resin type with insulation class ‘B’ or better. For other details refer clause no 2.1(5). (Technical particulars given by Purchaser).

5.5.1.1 Access to CT terminals If the CTs are located in the cable compartment, the terminals of CT shall be easily accessible and the same shall be facing towards the cable termination side and not towards bus bar side. Shall have appropriate polarity marks.

5.5.1.2 FRP/SMC barriers between CTs Shall be provided. 5.5.2 POTENTIAL TRANSFORMER (PT): 5.5.2.1 Type Shall be draw out, single pole version, epoxy

cast resin type with insulation class ‘B’ or better. For other details refer clause no 2.1(5). (Technical particulars given by Purchaser).

5.5.2.2 Mounting Line PT shall be mounted in a separate draw out carriage. In case of truck mounted breaker, line PT shall be provided in a separate panel. The Line PT shall also be mounted on breaker trolley.

5.5.2.3 HV Neutral The HV neutral connection to earth shall be easily accessible for disconnection during HV test.

5.5.2.4 Shutters Metallic shutters shall be provided to automatically seal off the high voltage spouts when PT is withdrawn.

5.5.2.5 Protection Shall be protected on both sides with current limiting fuses/MCBs.

5.5.3 Inspection IGCAR shall carry out pre-dispatch inspection on instrument transformers (CTs & PTs) at Manufacturer’s works with the co-ordination of Switch Board manufacturer.

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5.6 INTEGRAL MAKE PROOF EARTHING SWITCHES

5.6.1 Integral, make proof earthing switches

Shall be fitted with each cable compartment for cable earthing.

5.6.2 Voltage, Current rating and Making capacity

Equal to switch gear rating

5.6.3 Integral earthing switch Shall be provided and interlocked with circuit breaker & CVD/Rear door to prevent incorrect operation.

5.6.4 Endurance class Class E1 5.6.5 Mechanical Indication (ON/

OFF) or position of earth switch

Can be seen from the front or rear of the switch gear by means of a mechanical coupled indicator.

5.6.6 Electrical indication (ON/OFF) of earth switch position

Shall be provided with LED indication lamps.

5.6.7 Operation of Earth Switch Shall be operated from the front or rear of the cubicle with manual operation by means of a removable handle.

5.6.8 Interlocks Necessary Mechanical and Electrical interlocks shall be provided to prevent inadvertent closing on live circuit. i) Earthing switch handle can be inserted in

its socket only if the VCB is in “Test” position for outgoing panels and for incomer panels, upstream VCB is in isolated condition and restricted to rack in.

ii) Vacuum circuit breaker cannot be moved

from “Test” to “Service” position while the earthing switch is in “ON” i.e. earthed.

iii) Adequate number of auxiliary contacts shall be provided for indication, Electrical interlocks with downstream and upstream CBs

5.6.9 Key locking facility Key locking facilities should be available for blocking of operation of the earthing switch for both closed and open positions.

5.6.10 Any kind of earthing truck for feeder or bus bar

Not required.

5.7 EQUIPMENT EARTHING 5.7.1 Material of earth bus Flat Tinned Electrolytic Copper extending over

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the entire length of Switch Board. 5.7.2 Extendibility Extensions shall be provided at both ends of

the Switch Board with necessary hole and hardware suitable for connecting 50x6 mm tinned copper flat from external earthing system.

5.7.3 Bus identification Colour coded 5.7.4 Sizing and Rating Sized for rated short circuit current of 25 kA

for 3 seconds. 5.7.5 Current density of earth bus Current density of earth bus shall be selected

as per short circuit capacity of the respective panels.

5.7.6 Earth bus joints Firmly joined with adequate numbers of bolts and nuts

5.7.7 Enclosure and non – current carrying parts of the switch board / components

Effectively bonded to the earth bus.

5.7.8 Hinged doors Earthed through Green colour with yellow colour strip, 1100 V grade, 6.0 sq.mm (min.), FRLS PVC insulated stranded copper wire or through flexible copper braid equivalent to 6.0 sq.mm, insulated with Green colour with yellow colour strip, 1100 V grade FRLS PVC insulating sleeve.

5.7.9 Circuit breaker frame / carriage

Breaker truck shall ensure earthing in both connected and disconnected positions. The circuit breaker shall be earthed through the truck wheels & scrap bus.

5.7.10 Metallic cases of relays, instruments and other LT panel mounted equipment

Connected to the earth bus by independent FRLS copper wires of size not less than 6.0 sq.mm with green colour insulation.

5.7.11 CT and PT neutral Earthed at one place at the terminal blocks through links.

5.8 METERS 5.8.1 Mounting arrangement of all

meters Flush mounted

5.8.2 Multi-Function Meter a) System 3 Phase, 4 Wire, 50 Hz b) Type Digital/Numerical type with built in selector

switches/key pad to read various parameters. c)Panels where to be

provided All VCB panels

d) Accuracy class Class 1 e) Communication capability RS485 or RJ45 port f) Additional facility Four line seven digit display backlit for reading

parameters like Power Factor, Kwh, kW,

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kVA, kVAR, frequency, THD, Voltage and Current etc. The front face of meter shall have LED indication for healthiness/ calibration /communication

f) Preferred make Secure/Schneider 5.9 INDICATION LAMPS ,

ANUNCIATOR AND HOOTER

As per IEC: 60073 and IEC: 60947-5-1

5.9.1 INDICATION LAMPS 5.9.1.1 Mounting arrangement Flush mounted 5.9.1.2 Lamps High intensity clustered, LED type 5.9.1.3 Rated voltage 110 V DC /110 V AC 5.9.1.4 Over voltage capacity 120% of Rated voltage 5.9.1.5 Protection feature Low Voltage Glow Protection (LVGP) and

Short circuit protection 5.9.1.6 Breaker ON Red 5.9.1.7 Breaker OFF Green 5.9.1.8 Auto Trip Amber 5.9.1.9 Breaker Service position Yellow 5.9.1.10 Breaker Test position White 5.9.1.11 Spring Charged Blue 5.9.1.12 Trip circuit-1 healthy White 5.9.1.13 Trip circuit-2 healthy Pink 5.9.1.14 Cable compartment Limit

Switch Operated - Trip Amber

5.9.1.15 Cable compartment rear door closed

Green

5.9.1.16 Cable Compartment rear door opened

Red

5.9.1.17 PT Supply Red, Yellow, Blue 5.9.1.18 Heater circuit healthy Blue 5.9.1.19 DC control supply-1 fails Orange ( separate annunciator in 110V AC ) 5.9.1.20 DC control supply-2 fails Amber ( separate annunciator in 110V AC ) 5.9.1.21 Integral earth switch ON Red 5.9.1.22 Integral earth switch OFF Green 5.9.1.23 Link panel service position Yellow 5.9.1.24 Link panel isolated position White 5.9.2 ANNUNCIATOR 5.9.2.1 Type Static type along with alarm. Annunciations

shall be repetitive type and shall be capable of registering fleeting signal. Fascia test facility shall also be provided.

5.9.2.2 Operating voltage 110 V DC 5.9.2.3 Mounting Flush mounted

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5.9.2.4 Fascia As required in the Clause No.: 5.9.2.6 5.9.2.5 Number of annunciators As required. Annunciators shall be grouped

separately for trip and alarm. Each annunciator shall have 20% spare windows.

5.9.2.6 Signals to be provided in fascia at appropriate locations

Fascia

All Incomers 1) Incomer protective relay trip 2) Incomer UV trip 3) Incomer TCH-1 unhealthy 4) Incomer TCH-2 unhealthy 5) Incomer rear door open 6) LPT Fuse fails 7) Incomer numerical relay unhealthy. 8) Emergency trip push button actuated Bus coupler and link panel

9) Bus coupler protection relay trip 10) Bus coupler rear door open 11) Bus coupler TCH-1 unhealthy 12) Bus coupler TCH-2 unhealthy 13) Bus coupler numerical relay unhealthy 14) Link panel rear door open 15) Incoming Aux. DC source -1 fails 16) Incoming Aux. DC source -2 fails 17) Incoming Aux. AC source fails 18) Emergency trip push button actuated

All Transformer & Spare feeder 19) Transformer WTI Trip 20) Transformer WTI Alarm 21) Transformer enclosure temp. Alarm 22) Transformer enclosure temp. Trip 23) Transformer protection relay trip 24) Transformer numerical relay unhealthy 25) Transformer feeder TCH-1 unhealthy 26) Transformer feeder TCH-2 unhealthy 27) Transformer feeder rear door open 28) Transformer enclosure door open 29) Transformer REF trip 30) Emergency trip push button actuated

5.9.2.7 Push buttons For test, accept and reset

5.9.2.8 Potential free contact To be provided for event logger

5.9.2.9 Alarm scheme (Hooter) with isolation switch

Electronic, panel mounting type with timer control, 110V DC operated medium intensity. The hooter will cut off after a pre-set time or after .

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5.9.2.10 Location of Annunciation window fascias

To be provided in transformer feeders for transformer fault annunciations and for incomers, bus coupler, link panel and outgoing feeder fault annunciations, the annunciation shall be provided in respective breaker panels.

5.9.2.11 Sequence operation of the annunciation shall be as follows:

S.No Alarm condition Fault contact

Visual annunciation Audible annunciation

1 Normal Open Off Off 2 Abnormal Close Flashing On 3 Accept Close Steady on Off 4 Return to normal Open Steady on Off 5 Reset Open Off Off 6 Reset before return to

normal Close Flashing On

5.10 SELECTOR SWITCHES AND PUSH BUTTONS

Selector Switches and Push Buttons mounting arrangement

Flush mounted on LV compartment door with shrouded terminals and with clearly marked operating positions.

5.10.1 Selector switches: a) TNC switch with pistol grip Lockable, Spring return to normal position.

Red colour is preferred. b) Local / SCADA (or) remote

selector switch Lockable, 2 Pole

c) Upstream CB trip Lockable, 2 pole. Red colour is preferred. d) ON/OFF switches For heater / illumination circuit e) Mounting Flush f) Rating 110 V DC, 16 A and or 240 V AC 5.10.2 Push Buttons: a) Emergency trip push button Red with stay put b) Push button for LED lamps

testing Orange

c) Push button for heater circuit healthy

Blue/Black

d) Rating 110 V DC, 10 A 5.11 INTERNAL WIRING 5.11.1 Internal wiring 1100 V grade, Stranded flexible Copper

conductor, FRLS HRPVC insulated halogen free Sheathed wire. Control wires shall be terminated with ring type lugs only with maximum of two wires per terminal. Connecting more than two terminals shall

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not be permitted. For tap offs adjacent terminal with shorting strips shall be used.

5.11.2 Size CT Circuit : 2.5 Sq.mm PT Circuit and Control Circuit : 2.5 Sq.mm Auxiliary Circuit : 1.5 Sq.mm

5.11.3 Wiring of auxiliary contacts All spare or otherwise shall be wired & brought out to terminals.

5.11.4 Wiring colour code: a) PT Circuit R Phase – Red

Y Phase – Yellow B Phase – Blue Neutral – Black

b) CT Circuit R Phase – Red Y Phase – Yellow B Phase – Blue Neutral – Black

c) Other control circuits DC -1 – Pink/Grey DC-2 - Brown AC – Black Earth – Green

5.11.5 Ferrules The wire terminals shall be plastic sleeve with machine printed Black letters at both ends (by cross & local end ferruling method) and drawings shall bear the same numbers. Conventional (individual number ferrules) ferrules shall not be used.

5.11.6 Ferrule type Sleeve/Tube type (One additional red colour ferrule for all wires in trip circuit)

5.11.7 Lugs Tinned Copper, Pre-insulated, ring type only. CT terminals shall use ring type lugs only.

5.11.8 Spare contacts of CBs, Relays, Timers, Contactors etc.,

Wired up to terminal blocks. 20 Nos. of spare terminals in each panel shall be placed at one place for User purpose.

5.11.9 Wiring enclosure Plastic channels/troughs, inter panel wiring through PVC sleeves with suitable grommets

5.11.10 Inter panel wiring Wires with ferrule to be terminated in the adjacent shipping section will be supplied with one end terminated and the other end bunched and coiled.

5.11.11 Auxiliary supply wiring Auxiliary supply wiring for AC and DC supplies, Voltage Transformer circuits, anunciation circuits and other common

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services shall be provided on the same set of terminals in all the panels with proper segregation.

5.12 TERMINAL BLOCKS (TB) 5.12.1 Terminal Blocks (TB) 1100V grade, 10A minimum rating, Nylon

66, Screw type. STH4 model of Connect-well make / equivalent model in Elmex / Phoenix control terminals shall be used complete with insulated barriers, washers, nuts and lock nuts.

5.12.2 Suitability For termination of minimum 6.0 sq.mm flexible copper conductor.

5.12.3 Marking and covers White fiber markings strip with clear plastic, slip-on/clip-on terminal covers with terminal number to be provided.

5.12.4 Terminals for PT & CT secondary leads

With provision for shorting with screw driver operated sliding link (ie., with disconnecting facility)

5.12.5 Shorting and earthing facility To be provided in CT terminals 5.12.6 Spare terminals 20% in each TB row 5.12.7 TB shrouds and separators Moulded non-inflammable plastic material 5.12.8 Clearance between two sets of

TB 100mm minimum or As per the manufacturer standard design

5.12.9 Clearance with cable gland plate 250mm minimum or As per the manufacturer standard design

5.12.10 Clearance between AC / DC set of TB

100mm minimum or As per the manufacturer standard design

5.12.11 Relay Test Terminal Blocks (TTB)

Shall be provided in all panels for testing of relays. Model shall be equivalent to MPEG model of Alstom.

5.12.12 Transparent acrylic cover Shall be provided to cover complete control terminals.

5.12.13 Shrouds for all terminals on all the devices on LT compartment door

Shall be provided. Not even a single terminal shall expose live.

5.13 PROTECTION RELAY A General Features of electrical

protection numerical relay for all VCB feeders:

5.13.1 Technology and Functionality Numerical, Microprocessor based with provision for multifunction protection, control, monitoring and metering.

5.13.2 Front LED Relay should have Minimum 8nos. LED 5.13.3 CT inputs CT inputs 5A 5.13.4 Mounting Flush 5.13.5 Architecture Hardware and software architecture

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preferably be modular and disconnectable to adapt the protection and control unit to the required level of complexity as per the application.

5.13.6 Programming and configuration Relay shall utilize a user friendly setting and operating software suitable for Windows atmosphere with menus and icons for fast access to data required; Preferably single software should be used for programming of protection function, building of logics, disturbance recording and communication settings. Programming software and communication cord for offered relays shall be included in the scope of the supply.

5.13.7 SCADA interface port RS485 or RJ45 port or Optical port for interfacing with SCADA on IEC 61850/modbus protocol. If relays have any other rear port hardware/software required to achieve the above said compatibility will be the scope of Supplier.

5.13.8 PC interface port Relay shall have USB/RS232 front port for configuration / data downloading using PC. Cost of licensed software and communication cord required for programming of offered relays shall be included in cost of switchgear.

5.13.9 User interface Minimum of 32 characters alphanumeric LCD display with backlit and keypad. It should be possible to access and change all settings and parameters without the use of PC.

5.13.10 Relay characteristics Relay shall integrate all necessary protections for different applications in accordance with IS and IEC. Relay shall provide wide setting ranges and choice of all IEC, IEEE and other tripping curves through a minimum of two setting groups.

5.13.11 Event and Fault records Relay shall have the facility of recording of various parameters (current, voltage, waveforms during faults etc.,) during event/fault with option to set the duration of record through settable pre-fault and post fault time with 1ms accuracy. Relay shall store records for last minimum 200 events and 5 faults minimum. It should be possible to download records locally to PC or to remote SCADA.

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5.13.12 Self diagnosis Relay shall able to detect internal failures. A watch dog relay with change over contact shall provide information about the failure.

5.13.13 Time synchronization All relays shall be capable of being synchronized with the system clock.

5.13.14 Acknowledge/Reset Push buttons for resetting 5.13.15 Test facility Preferably shall have In built testing facility

with simulation of current and voltages with programming software itself without use of any secondary injection kit to facilitate testing /commissioning independently.

5.13.16 Communication protocol compatibility

All numerical relays shall be with IEC: 61850 or modbus communication protocol compatibility.

5.13.17 Looping of Numerical relays and meters

All RS485 or Ethernet communication ports of protective relays shall be looped with necessary cabling / wiring / connectors etc. To form a common bus for SCADA communication. The looping cable shall have shielding for EMI interference.

5.13.18 Connectivity between Relays to Ethernet switches for SCADA

Shall be provided as required. Ethernet switches and related accessories for connecting the relays are under the scope of contractor/switchboard supplier.

5.13.19 Ethernet switch Shall be provided with industrial grade, redundant power input module of 110V DC with sufficient SFP optical ports. The number of copper and optical port with spare port shall be decided during drawing approval. The power supply shall be taken from DC bus.

5.13.20 No. of DI’s and DO’s Shall have 12DIs and 4DOs 5.13.21 CB failure protection and

condition monitoring Relay shall have built-in CB failure protection and CB condition monitoring. Relay shall be capable to record the energy interrupted by the breaker and rise alarm when the total energy interrupted exceeds a set limit.

5.13.22 Trip circuit supervision Relay shall have built-in trip circuit supervision in CB ON and OFF condition along with other protection functions or individual supervision relay.

5.13.23 Protections a) Three phase over current (and earth fault protection with IDMT, DT and instantaneous characteristics.

b) Under voltage and over voltage

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protection only for incomer feeders c) Inrush blocking protection d) LPT supervision only for incomer

feeders e) CT supervision

5.13.24 Auxiliary power supply 110V DC B Arc flash protection 5.13.25 General features The arc flash protection can be achieved by

using any one of the sensors such as light sensor or pressure sensor etc. It is the responsibility of the suppliers to provide & integrate the sensors with arc flash relay and establish the effectiveness of protection by actual testing. Arc flash protection relay could be either integral part of numerical electrical protection relay or separate relay.

5.13.26 Compartment shall be protected It is envisaged to provide arc flash protection in breaker compartment, busbar compartment and cable compartment of entire switchboard

5.13.27 Mounting Flush or din rail or surface mount

5.13.28 Auxiliary power supply 110V DC

5.13.29 Status /command signals – SCADA interfacing either wiring & configuration to Relay or separate terminal block will be decided during drawing approval stage

5.13.29.1 Routing of DI status signals to SCADA

Status or DI - 1 – TC1 Healthy Status or DI – 2 – TC2 Healthy Status or DI - 3 – CB Auto trip (contact from lockout relay) Status or DI - 4 – CB open Status or DI - 5 – CB close Status or DI - 6 – CB in service Status or DI - 7 – CB in test Status or DI - 8 – Spring charged Status or DI - 9 – L/R switch in local Status or DI - 10 – PT Fuse fails

5.13.29.2 Execution of commands through SCADA interfaces port.

Command or DO – 1 – Open Command or DO – 2 – Close

5.13.29.3 Spare DI & DO Shall be wired to separate terminal block or Relay for future purpose.

5.13.30 Auxiliary relays – General features 5.13.30.1 Relays for auxiliary, trip circuit

supervision and timer relays Numerical / Electro-mechanical type in all panels.

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5.13.30.2 Reset mechanism for auxiliary relays

Self reset contacts except for lock-out relays

5.13.30.3 Reset mechanism for Lock-out relay

Hand reset type, without inbuilt batteries

5.13.30.4 Operation indicators With hand reset operation indicators (flags) or LEDs with push buttons for resetting.

5.13.31 Auxiliary Relays - Requirement

5.13.31.1 Anti-pumping (94), Lock-out (86), Trip Circuit Supervision (74) Relays

For each breaker

5.13.31.2 PT selection relays To be provided for Line PT of respective sections

5.13.31.3 Switch gear with two incomers and bus coupler

Lock-out relay (86) contact of each incoming breakers to be wired in series in closing circuit of other incoming breakers and bus coupler.

5.13.31.4 Auxiliary relays, Contact multiplication relays etc.,

To effect interlocks and to exchange signals of status and control

5.13.31.5 Dry type transformer feeders & Spare feeders - Auxiliary relays.

(1) Auxiliary relays with indicating flags shall be provided for the following alarm and trip commands:

(2) WTI trip (3) WTI alarm (4) Enclosure temperature indicator trip (5) Enclosure temperature alarm (6) Enclosure open trip

5.13.32 General requirement of all relays and contactors 5.13.32.1 Auxiliary supply 110V DC. All relays and contactors shall be

suitable for continuous operation at 10% over voltage.

5.13.33 Additional safety requirements: (a) (i)

Cable compartment (Rear) Door Safety System from accidental opening of door: Achieved by two numbers of rear door limit switches provided diagonally in the all Cable, Bus coupler and Bus riser Compartments.

During accidental Opening/removal of Incomers Cable Compartment rear door: The safety system shall be wired in such a way that the corresponding Upstream CB should trip. During accidental Opening/removal of Outgoing feeder Cable Compartment rear door: The safety system shall be wired in such a way that the respective out going feeder CB should trip.

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During accidental Opening/removal of Bus Coupler (BC) breaker rear door: The safety system shall be wired in such a way that the Incomer – 1 CB and Bus Coupler CB should trip when power feed from incomer-1. The safety system shall be wired in such a way that Incomer – 2 CB and Bus Coupler CB should trip when power feed from incomer-2. During accidental Opening/removal of link panel rear door: The safety system shall be wired in such a way that Incomer – 2 CB and Bus Coupler CB should trip.

(ii)

Rear cover interlock with Castle Lock & Key: Castle locks will be provided on each breaker front frame and top rear cover of respective panel. Single key shall be provided for each set of locks for each feeder. While breaker is in “Service” position, rear cover (cable compartment cover) cannot be opened for that panel, as rear covers are locked with castle lock and key shall be “withheld” in the castle lock of the breaker. To open the rear covers, breaker has to be racked out from “Service” to “Test” position, then castle key to be removed and same key to be inserted to castle lock of the rear cover to unlock.

Note: Any equivalent systems which can meet above safety requirement will be finalized during drawing approval stage.

(b) Capacitive Voltage Detecting (CVD) system

a) In all incomer, Bus coupler and link panel, CVD shall be provided to indicate visually “the cable is in live” the indication instrument shall be provided and the same shall be mounted suitably on the front side of LV compartment.

b) The device shall not require any auxiliary power and the same shall be field testable.

c) Shall be provided with adequate number of auxiliary contacts for indication.

5.14 SPACE HEATER 5.14.1 Space heater Non-exposed type, Anti-condensation

heaters with adequate rating. 5.14.2 Location CB and Cable compartment. Heaters shall

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be situated so that they do not cause any deterioration in the wiring or in the operation of the components. Heater position in cable compartment shall be easily accessible after cable termination.

5.14.3 Rated voltage and frequency 240 V AC, 50Hz 5.14.4 Source External AC control power supply 5.14.5 Control Thermostat controlled 5.14.6 Protection 2P MCB located in LV compartment 5.14.7 Mounting arrangement Shall be mounted on an insulator 5.15 SWITCH AND SOCKETS FOR HAND LAMP / MAINTENANCE 5.15.1 Rated voltage and frequency 240 V AC, 50Hz 5.15.2 Source External AC control power supply 5.15.3 Rated current 5 A 5.15.4 Type Modular, Universal type 5.15.5 Location In LV chamber 5.15.6 Control Control switch along with shuttered socket 5.15.7 Protection 2 Pole MCB located in LV compartment 5.16 ILLUMINATING LAMP 5.16.1 Rated voltage and frequency 240 V AC, 50Hz 5.16.2 Source External AC control power supply 5.16.3 Type LED 5.16.4 Location LV compartment and Cable compartment 5.16.5 Control LV compartment door limit switch 5.16.6 Protection 2 Pole MCB located in LV compartment 5.17 CAUTION AND DANGER BOARDS 5.17.1 Material Metal Engraved 5.17.2 Size of Boards, letters and

symbols As per Bureau of Indian standards/IE Rules

5.17.3 Languages required English, Hindi, Tamil with skull mark & voltage rating

5.17.4 Danger Boards: Locations to be fixed

1) On two sides of complete Switch Board 2) Wire mesh/door inside the Cable compartment 3) Removable rear door of Cable compartment 4) Removable rear door of Bus Bar compartment 5) Front door of Circuit Breaker compartment

5.17.5 Caution Label/Board “Don’t touch Electrical installation” with warning symbol in all accessible HV portions “WARNING: Disconnect the power supply

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before opening the door” on all rear doors. 5.18 NAME PLATES Nameplate shall be durable and clearly

legible and visible in the position of normal service and installation.

5.18.1 Material Metal 5.18.2 Name Plate of CB:

The following details shall be engraved in the metallic plate and shall be fixed in a manner acceptable to the Purchaser.

1) Manufacturer 2) Type designation and serial number 3) Rated voltage 4) Rated Power frequency withstand voltage 5) Rated lightning impulse withstand voltage 6) Rated frequency 7) Rated normal current 8) Rated duration of short circuit 9) Rated short circuit breaking capacity 10) DC component of the rated short circuit breaking current 11) First pole-to-clear factor 12) Rated out of phase breaking current 13) Rated cable charging breaking current 14) Rated supply voltage of closing and opening devices 15) Rated supply voltage of auxiliary circuits 16) Rated supply frequency of auxiliary circuits 17) Mass 18) Rated operating sequence 19) Year of manufacture 20) Temperature class 21) Classification 22) Relevant standard with date of issue

5.18.3 Name Plate of Metal Enclosed Switchboard:

The following details shall be engraved in the metallic plate and shall be fixed in a manner acceptable to the Purchaser.

Material: Metal Engraved 1) Manufacturer 2) Type designation

3) Serial number 4) Year of manufacture 5) Applicable standard 6) Rated voltage 7) Rated frequency

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8) Rated Power frequency withstand voltage 9) Rated lightning impulse withstand voltage 10) Rated normal current 11) Rated short-time withstand current (for main and earthing circuits) 12) Rated peak withstand current (for main and earthing circuits) 13) Rated duration of short circuit (for main and earthing circuits) 14) Internal Arc Classification 15) Accessibility type (code) 16) Arc test current 17) Arc test current duration 18) PO No. and Date

5.18.4 Name Plate of Current Transformer

As per latest edition of IS: 2705 - To be fixed on the CT.

Labels for CT ratio available and CT ratio adopted (Separate labels for adopted lower and higher ratio. One label shall be fixed on the panel and the other label shall be sent as loose item along with the Switch Board)

To be fixed (Pasting is not acceptable) on front side of LV compartment door near to the relay. The label shall be easily removable and can be fixed again in the same place.

5.18.5 Name Plate of Potential Transformer

As per latest edition of IS: 3156 - To be fixed on the PT

5.18.6 Designation of Switch Board (11 kV SWITCH BOARD)

To be fixed on top and centre of the Switch Board

(a) Material Metal (b) Thickness 3.0 mm (c) Lettering Engraved (d) Letter size 75 mm (e) Fixing arrangement As per good engineering practice in a

manner acceptable to the Purchaser. (Pasting is not acceptable)

5.18.7 Designation of Feeder: (Panel No., Feeder Name and Current Rating)

Large and bold name plate carrying feeder designation / numbers / current rating shall be provided and fixed on front side top of each CB compartment as well as rear side. On rear side, name plate shall be provided on the frame.

(a) Material Metal (b) Thickness 3.0 mm (c) Lettering Engraved (d) Letter size 25 mm

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(e) Fixing arrangement As per good engineering practice in a manner acceptable to the Purchaser. (Pasting is not acceptable)

5.18.8 IDENTIFICATION LABELS AT EACH CUBICLE AND EACH INSTRUMENT

Approved design (Stickers are not acceptable)

(a) Material Aluminium Anodized (b) Lettering Engraved with white letters with black

backround. (c) Letter size 3 to 25 mm (Exact size for each device) (d) Manufacturer Name plate On front top door of panel. (e) Fixing arrangement As per good engineering practice in a

manner acceptable to the Purchaser. (Pasting is not acceptable)

5.19 SURFACE TREATMENT AND PAINTING

(a) Surface treatment Sand blasting or by Seven/Nine tank process

(b) Paint type Epoxy Powder coated / Pure Polyester base Grade “A” high glossy finish

(c) Paint shade RAL 2000 for Incomer feeder RAL 6001 for Bus-coupler / link panel RAL 7038 for Outgoing feeder & inner surface of all panels However painting shall not be applicable for Alu-Zinc sheet.

(d) Paint thickness Minimum 50 microns. 5.20 INSPECTION AND TESTING (a) Type Tests The product must be of type tested quality

as per all tests in Indian/IEC Standards. (b) Type Test Report validity period Last ten (10) years from date of bid

submission 5.20.1 Pre-dispatch inspection (a) All the Items covered by this

specification to be supplied by the manufacturer shall be offered for Pre-dispatch inspection to the Engineer-in-Charge or his authorized representative. Items/Components found unsatisfactory as to workmanship or materials shall be removed by the Switchgear manufacturer and replaced at no extra cost with Items/Components which are satisfactory.

(b) All the Items/Components covered by this specification to be supplied by the Switchgear manufacturer shall be dispatched only after obtaining the written Shipping Release from the Engineer-in-Charge. Waiving off pre-

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dispatch inspection or acceptance of the items by the quality surveyor shall not relieve the Manufacturer from the responsibility of furnishing the items and workmanship in accordance with this specification.

(a) Notice to Purchaser for conducting/witnessing Routine tests

At least three (3) weeks in advance

(b) Test reports of Type, Routine tests before dispatch for approval

Submit Four (4) copies

(c) (i) Routine Tests on Complete Switch Board: 1) Dimensional checks 2) Physical verification of

components 3) IR measurement of Main and Auxiliary circuits 4) Power frequency withstand

voltage test on Main and Auxiliary circuits

5) Interchangeability of CB with same type and rating

6) Closing circuits in local and remote and in service and test mode

7) Tripping circuits in local and remote and in service and test mode

8)Verification of Trip free/Anti-pumping feature

9) Indication circuits 10) Mechanical and Electrical

operations and sequence of operations tests

11) CB closing and tripping scheme with rear door limit switch

operation related to incomers and outgoing feeders

12) Primary injection test 13) Mechanical and Electrical

Closing interlocks between CB and integrated Earth switch

14) Closing and tripping scheme with rear door limit switches

15) All the logics mentioned in

As per the specification and relevant standards. Charges for these tests shall be deemed to be included in the equipment price. The Purchaser reserves the right to witness all the Routine tests on complete Switch Board, CB Modules and CTs/PTs at Manufacturer’s works. It is the responsibility of the Manufacturer / Supplier / bidder to co-ordinate the Purchaser for conducting acceptance / routine tests on CTs and PTs and all bought out equipments before dispatch from the Manufacture’s works before assembly.

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the specifications. (ii) Routine Tests on all Circuit Breaker Modules: 1) Power frequency withstand

voltage Test 2) IR measurement before and after Power frequency withstand voltage Test 3) Vacuum integrity test 4) Measurement of Contact

Resistance test (milli-volt drop test)

5) Closing time at rated control voltage

6) Opening time at rated control voltage 7) Close operation at 110 %

control voltage 8) Open operation at 110 %

control voltage 9) Close operation at 80 %

control voltage 10) Open operation at 70 %

control Voltage 11) Measurement of spring

charging Motor current 12) Spring charging time at rated control voltage 13) Spring charging time at 110%

control voltage 14) Spring charging time at 70 % control voltage 15) Manual closing and tripping

of CB 16) Resistance measurement of

closing, tripping(2 Nos.) coils and spring charging motor

(iii)Routine Tests on Current Transformer (CT): As per IS 2705

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(iv) Routine Tests on Voltage/Potential Transformer(VT/PT): As per IS 3156 (v) Routine Test and Programming on Numerical Relays: 1) Secondary injection test either Manufacturer’s place or switchboard manufacturer’s works. (vi) Routine Test and Programming on Multi-function Meter: 1) Secondary injection test 2) Configuring/Programming of meters

5.21 DRAWINGS AND DATA SUBMISSION Number of copies of Drawings /

Documents required at different stages

As per Clause No.: 2.2

5.22 TO BE FURNISHED ALONG WITH THE BID (a) Duly filled GTP and Signed copy

of specification With date stamp / Sign on each page.

(b) GA / Cross Sectional drawing of panel / foundation plan

Shall be provided.

(c) Dimensions of Cable termination box

The Box shall be suitable for terminating 2R x 11 kV (E), 3C x 400 sq.mm A2XWY Cable with safe and adequate working clearance.

(d) Bill of Material For each type of feeder (e) Type Test Reports with detailed

drawings submitted to type test laboratory as per IEC: 62271-100 & IEC: 62271-200

For the voltage rating of equipment offered.

(f) Reference list of Customers For last 5 years with units of similar design / rating

(g) Complete product catalogue and manual

For Breaker / Relays / Components

(h) Manufacturer’s Quality Assurance Standards and Program (QAP)

Copy of ISO 9000 series or equivalent national certification.

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5.23 TO BE FURNISHED AFTER AWARD OF CONTRACT (a) Completely filled GTP With date stamp / Sign on each page (b) Single Line Diagram With date stamp / Sign on each page (c) GA/Cross Sectional Drawing To show all views and sections (d) Detailed Foundation Plan Shall be provided (e) Bill Of Material Shall be provided (f) Schematic / Control Wiring

Drawings Shall be provided

(g) QAP Shall be provided (h) Calculation for sizing of various

components For Bus Bar, MCBs, MCCBs, Fuses, Stabilizing Resistors

(i) Complete Product Catalogue For all Relays/Breakers/Components (j) Drawing and Document sizes Standard size paper A3 and /or A4

5.24 ACCEPTANCE CRITERIA: Purchaser will accept 11kV switchboard under following conditions

i) Switchboard should pass the routine test as per clause 5.20.1.c.(i) ii) Vacuum circuit breaker should pass the routine test as per clause 5.20.1.c.(ii) iii) Current transformer should pass the routine test as per clause 5.20.1.c.(iii) iv) Potential transformer should pass the routine test as per clause 5.20.1.c.(iv) v) Numerical relay should pass the routine test as per clause 5.20.1.c.(v) vi) Multifunction meter should pass the routine test as per clause 5.20.1.c.(vi) vii) Construction & design of offered switchboard shall be similar to the type tested

design 5.25 TO BE SUBMITTED PRIOR TO DISPATCH

Submittals required prior to dispatch

a) Routine test reports as per Clause No.:5.20.1 and Compliance report by Manufacturer

b) Type test certificates as per IEC: 62271-100 & 200 for the voltage rating of Switch Board offered

c) Test certificates of all bought out items d) Installation, Testing, Commissioning,

Operation and Maintenance manual e) Required software for Numerical relays and

MFMs, if any 5.26 PACKING (a) Packing Protection

Against corrosion, dampness, heavy rains, breakage and vibration. Two layers of polythene cover and complete panel with thicker carton box.

(b) Packing for accessories and spares

Robust wooden non-returnable packing case with all the above protection and identification labels

(c) Packing identification label

For each packing case, the following details are required: 1) Individual serial number 2) Purchaser’s name

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3) PO number (along with SAP item code if any) & date 4) Equipment Tag No.( if any) 5) Destination 6) Manufacturer / Supplier’s name 7) Address of Manufacturer / Supplier 8) Description and Quantity 9) Country of origin 10) Month and year of manufacturing 11) Case measurements 12)All necessary slinging and stacking instructions 13) Each panel packing shall be identified with its panel number and substation name

5.27 SHIPPING a) The bidder/manufacturer/supplier shall ascertain at an early date and definitely before the commencement of manufacture, any transport limitations such as weights, dimensions, road culverts, overhead line, free access etc., form the Manufacturing plant to the Project site. Bidder shall furnish the confirmation that the proposed packages can be safely transported, as normal or oversize packages up to the site. Any modifications required in the infrastructure and cost thereof in this connection shall be brought to the notice of the Purchaser.

b) The bidder/manufacturer/supplier shall be responsible for all transit damage due to improper packing.

5.28 HANDLING AND STORAGE (a) Handling and Storage Detail handling and storage instruction

sheet / manual needs to be furnished before commencement of supply.

5.29 QUALITY ASSURANCE (a) Manufacturer quality plan To be submitted for Purchaser approval. (b) Inspection points As per clause No.:5.20 5.30 PROGRESS REPORTING (a)

Outline document

To be submitted for Purchaser approval for outline of production, testing, inspection, packing, dispatch, documentation program at an appropriate stage.

(b) Detailed Progress Report

To be submitted to Purchaser once a month containing: 1) Progress on material procurement

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2) Progress on fabrication (As applicable) 3) Progress on assembly (As applicable) 4) Progress on internal stage inspection 5) Reason for any delay in total program 6) Details of test failures if any in manufacturing stages 7) Progress on final box up 8) Constraints / forward path

5.31 ACCESSORIES Suitable handling truck / trolley

for lifting and moving the circuit breaker/link panel.

To be supplied. (One trolley per switchboard, if applicable).

5.32 SPARES TO BE SUPPLIED (1) Numerical Relay 1 no. (2) Arc flash protection relay 1 no. (3) Multifunction meter 1 no. (4) Potential transformer (R,Y,B)

with fuse 1 set

(5) CT for incomer rating (R,Y,B) 1 set (6) CB control plugs with pins(both

female and male plugs) 2 nos.

(7) Closing coils 4 nos. (8) Tripping coils 4 nos. (9) Auxiliary contactor 4 nos. (10) TNC switch 2 nos. (11) Local/Remote selector switch 2 nos. (12) Spring charging motor with

control unit 2 nos.

(13) Inter lock for rear cover safety system as per specification

2 nos.

(14) Micro switches 4 nos. (15) Indication lamp ( all colours) 2 set (16) Annunciation window (1 no.

incomer & 1 no. outgoing feeder) 1 set

(17) Master trip relay 1 no. (18) CVD with indicator (R,Y,B) 1 no. (19) Castle lock and key arrangements

for rear door/earth switch for all panels

2 set

5.33 PREFERRED MAKE OF MATERIALS

(1) 11 kV VCB Switchboards Siemens / Schneider / L&T (2) Vacuum Interrupters Siemens / Schneider / ABB/ Eaton /

Toshiba (3) Low voltage contactors Siemens / Schneider / ABB / L & T (4) HRC Fuse Units & Links Siemens / Schneider / L & T / GE Power (5) HT fuses Bussman / ABB / L&T

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(6) LT fuses Siemens / Schneider / L & T / ABB (7) Limit Switches Siemens / Schneider / ABB / BCH (8) Push Buttons/Indication Lamps Siemens / Schneider / L & T / Binay (9) Multifunction meter Secure / Schneider (10) Current Transformers / Pragathi / Schneider / Kappa/ECS (11) Potential Transformers / Pragathi / Schneider / Kappa /ECS (12) Numerical Electrical Protective

Relays

Micom / Vamp/ / SEL / / Siemens Argus Reyrolle (Note: Numerical relays used in complete switch board shall be of same make. Use of two different makes of relays in a switchboard is not acceptable)

(13) Arc flash protection Relay Vamp/ L&T PGR/ Siemens (14) Auxiliary Relays Siemens / Schneider / ABB / Areva /

Alstom (Note: Auxiliary relays used in complete switch board shall be of same make. Use of two different makes of relays in a switchboard is not acceptable)

(15) Selector Switches Siemens / Schneider / L&T / Kaycee (16) Control Switch Siemens / Schneider / L&T (17) Contactors ABB / Siemens / Tele-Mechanique (18) Main bus bars, joints & tap offs

Insulation Raychem / 3M or equivalent

(19) Copper Wire/Cables Power Flex / Finolex / Polycab/lapp (20) Copper Lugs Dowell's / Lotus / Jainson (21) Test Terminal Blocks IMP / Schneider / Alstom (22)

Terminal Blocks Elmex / Connect well

(23) LED Indication Lamps Siemens / Binay / Teknic (24) Cable Gland Prabhat / Comet / Comex (25) Crimping type Copper Lugs Dowells / Lotus / Jainson (26) Alarm Annunciator Minilec / / proton (27) Ethernet switch Allied Telesis / Hirschmann / Moxa / R&M