CCUM 21Reverse Power Relay

AREVA T&D

Customer Benefits

• Economial means of detecting motoring conditions.

• Robust construction.• Faster fault clearance.• Draw out feature

CCUM 21 definite time reverse power relay provides a sensitive and economical means of detecting motoring conditions in diesel alternators and back pressure turbines. Faster clearance time can be obtained for lower values of reverse power than that are possible with inverse definite minimum time delay relays.

Features • Highspeeddirectionalelement. • Robustconstructionoflessthan3%rated singlephasepower. • Widerangeofdefinitetimesettings. • Consistenttiming. • Comprehensiverangeofauxiliaryunit ratings. • Drawoutcaseandtropicalisedfinish.

ApplicationTypeCCUM21definitetimereversepowerrelayprovides a sensitive and economical meansof detecting motoring conditions in dieselalternators and back pressure turbines. Fasterclearancetimecanbeobtainedforlowervaluesof reverse power than that are possible withinversedefiniteminimumtimedelayrelays.

DescriptionBasically relay type CCUM is a high speedinductioncupunit(typeCCD).Thecupcontactinitiates a static timing unit (type VTT) whichprovides the output contacts for alarm andtrip functions. Typical external and internalconnectionsareshowninFigure1

Technical data

Ratings

• Current1Aor5Aat50Hz. • Voltage110Vat50Hz.

Thermal rating

• Continuous2xratedcurrentat 110%Ratedvoltage • Shorttime20xratedcurrentfor 3seconds. Maximum torque angle

30º when connected as shown in Figure1(applied voltage lagging applied current. Thiscorresponds to Unity Power Factor in thesystem).

Sensitivity

About 1% of rated voltage with 1 to 15 timesratedcurrentor3%ofratedvoltagewith0.4to40 times rated current. Nominal power settinglessthan3%ofratedsinglephasepower.

AC burdens

• Currentcircuit:1VAatratedcurrent. • Voltagecircuit:9VAatratedvoltage.

Operating time

• 1-10secondsasstandard. • Othertimeranges:0.5-5s, 2.5-25s,6-60sand 12-120s.

PROTECTION

Case

1½D vertical draw out case suitable forflush mounting. Finished eggshell black andtropicalised.Suitabletripisolatingswitches,CTshortingswitches,andprovisionformaintainingtheundervoltagetripcircuitsonwithdrawaloftherelayunitfromthecase,areprovidedonthecradleassembly/case.

Figure 1:Typical external and internal connections for type CCUM 21 relay

Dimensions

CASe HeigHT WiDTH DePTH*

1½D 362mm 170mm 203mm

*Add 76 mm for maximum length of terminal studs, alternatively, 29 mm for terminal screws.

Contact ratings

Current MakeandCarry MakeandCarryContinuouslyfor3seConds

Break

AC 1250VAwithmaximaof5Aand660V

7500VAwithmaximaof30Aand660V

1250VAwithmaximaof5Aand660V

DC 1250Wwithmaximaof5Aand660V

7500Wwithmaximaof30Aand660V

100W(resistive)50W(inductive)withmaximaof5Aand660V

CCUM21relaywithdrawnfromcase

2>3

Auxiliary supply

• 30,110,220VdcStandard. • 220,250V50Hzaccanbe given. • Operatessatisfactorilybetween 75-120%ofratedvolts(dc) and80-115%ofratedvolts(ac).Auxiliary burden

• Approx.1.26,4.46,9.1watts for30,110,220voltsdc respectively. • Approx.2.3VAforacauxiliary supply.

Contacts

2 pairs (S/R) in any combination of normally open and normally closed.

Operation indicator

Hand reset mechanical operation indicator provided on timer unit.

Insulation

The relay meets the requirements of IS 3231, IEC-255-5 series C-2 KV for 1 minute.

Information required with order

1. Current rating.2. Operating time range.3. Contact combination.4. Auxiliary supply.

AREVA T&D

Pallavaram Works19/1, G.S.T. Road,Pallavaram, Chennai - 600 043Tel: 91-44-2264 8000

Fax: 91-44-2264 0040

AREVA T&D Worldwide Contact Centre:http://www.areva-td.com/contactcentre/Tel.: +44 (0) 1785 250 070

www.areva-td.com

Our policy is one of continuous development. Accordingly thedesignofourproductsmaychangeatanytime.Whilsteveryeffortismadetoproduceuptodateliterature.Thisbrochureshouldonlybe regardedasaguideand is intended for informationpurposesonly. itscontentsdonotconstituteanoffer forsaleoradviseontheapplicationofanyproductreferredtoinit.Wecannotbeheldresponsibleforanyrelianceonanydecisionstakenonitscontentswithoutspecificadvice.

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