protection instantaneous voltage relayssystemcontrols.co.in/datasheet/vagm high res.pdf ·...
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1
GRID
PROTECTION
Customer Benefits• Idealforovervoltage/un-
dervoltageapplication.• Adjustablevoltagerating• Operation annunciation in
theformofflag• Drawouttypecase• Completely dust proof by
IP5Xclassprotection
Type VAGM 22Instantaneous Voltage Relays
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Type VAGM 22
Instantaneous Voltage Relays
Type VAGM 22
Features
• Adjustablesettingrange• Veryhighdropoff/pickupratio• Unaffectedbynormalvariationinfrequencyofinputvoltage• Simpleandrobustconstruction• Positiveactionwithoutchatter
Application
Instantaneousover–voltageprotectionofgenerators,capaci-tors etc., definite timeundervoltageprotectionof acmotors,automaticvoltagechangeoverschemesandotherinstantane-ousanddefinitetimeundervoltageandovervoltageapplica-tionsrequiringadjustablesettings.
General description
VAGM22isstandardattractedarmaturerelaywithsevenequalsettingadjustableonaplugboard.
Adccoilisusedwithaninternallymountedbridgerectifiertoobtainadropoff/pickupratiooftheorderof90%.Aresistanceconnectedinserieswiththecoilistappedsuitablyandthetapsareconnectedtotheplugboardtoobtainsevenequalsetting.Acapacitorisusedtoserveasafilterunitforthebridgerectifieranditalsoactsasasurgesuppressorforprotectionthediodesofthebridgerectifieragainsthighvoltagetransients.
The dc coil is fittedwith a normally open light duty contactwhichisarragedtoenergiseanauxiliaryunitwhichprovidesthenecessaryoutputcontacts.
TypeVAGM22isasinglepolerelaywithitsauxiliaryunit.
Technical data
Voltage rating and setting
Relaysaresuppliedsuitableforoperationon110volts,50Hzsystemandhavethefollowingstandardsettingranges:
Overvoltagerelay110-140%adjustableinsevenequalsteps
Under-voltagerelay40-80%adjustableinsevenequalsteps
Resetting voltages
Overvoltagerelay:90%ofsettingvoltageUnder–voltagerelayrelay:110%ofsettingvoltage
Operating times
Over-voltagerelay:
0.060secondat110%voltagesetting
Undervoltagerelay:
0.025secondatzerovoltage.Thesetimesareinclusiveoftheopetatingtimeoftheassociatedauxiliaryunit.
VAGM22relaywithdrawnfromcase
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Type VAGM 22
Burdens (VAG coil)
Over-voltagerelay:
Maximumburdenatnominalvoltageis0.9VA
Under-voltagerelay:Maximumburdenatnominalvoltage(i.e.relaysetatthelow-estsetting)is2.5VA.
Thermal rating
Over–Voltagerelay:
TheVAGunitcanwithstandthreetimesthesettingvoltageonanysettingcontinuously.
Under-voltagerelay:
TheVAGunitcanwithstandtwotimesthepick-up(resetting)voltageonanysettingcontinuously.
Accuracy
Theover-voltageandunderrelaysconformtoerrorclassindexE5.0asperBS142–1966and5.0asperIS3231-1955.
Operation indicator
Therelayscanbefitted,ifrequired,withanoperationindicatorontheauxiliaryunit.Theindicatorishandresetbymeansofapush-rodprotruding through the relaycase.On theunder-voltagerelay,ofreverseoperationindicatorisfittedi.e.itoper-atesondrop-offorlossofvoltage.
Contacts
Uptothreepairsofstandardself-resetcontactscanbeprovidedontheauxiliaryunitoftherelayinanycombinationof‘Make’and ‘Break’. Theauxiliaryunit is alwaysenergizedbyanor-mallyopen,lightdutycontactoftheVAGunitincaseofunder-voltage relay. The auxiliary unit can be fitted with blow-outmagnetcontactsalso,ifrequired,forbreakingheavyorhighlyinductivedcloads.
The normal position, regarding the contacts, is the de-ener-gisedposition.
Contact rating : The contacts of the auxiliary unit of the relay are rated as follows :-Type of contacts Current Make & carry continuously Make & carry for 3.0 sec BreakStandard AC 1250VAwithmaximaof5Aand
660V7500VAwithmaximaof30Aand660V
1250VAwithmaximaof5Aand660V
Standard DC 1250Wwithmaximaof5Aand660V
7500Wwithmaximaof30Aand660V
100W (Resistive) or 50W (in-ductive)withmaximaof5Aand660V
Heavy duty mag-neticblow-out
DC 1250Wwithmaximaof5Aand660V
7500Wwithmaximaof30Aand660V
3¼KWmaximum
Dimensionsandweights
Relay Case size Minimum overall dimensions A p p r o x i m a t e gross weight Kg.Hight mm Widtgh mm Depth* mm
VAGM22 1DVert. 233 170 203 5.5
*Add76mmformaximumlengthofterminalstuds,alternatively,29mmforterminalscrews.Theapproximategrossweightgivenaboveisinclusiveofcartons,mountingappendagesandterminaldetails.Certifieddimensionaldrawingofcaseoutlines,panelcut-outsandmountingdetailsareavailableonrequest.TherelayscomplyfullywiththerequirementsofIS3231–1965andaresuitableforuseinnormaltropicalenvironments.
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GRID
InsulationTherelaymeetstherequirementsofIS32311965/ICE-255-5SeriesC-2kVfor1minute.
Case and finishRelaysaresuppliedinsinglepole,metaldrawoutcasessuitableforflushmountingarefinishedeggshellblackandtropicalised.Thedrawoutfeatureconsiderablysimplifiesmaintenanceandpermits testing to be carried out easily and quickly. A cradlemountedisolatingswitchisprovidedwhichautomaticallyiso-lates the trip circuitwhen the cradle assembly iswithdrawnfromthecaseformaintenance.Thispreventsanyinadvertenttrippingofthecircuitbreaker.Thecasecanalsobefittedwithswitchestomaintaintheunder–voltagetripcircuitsonwith-drawaloftherelayunitfromthecase.Afilterbreatherisfittedtoequalizepressureinsideandoutsidethecasewithoutadmit-tingdust.
Information required with order1. Typeofrelay(undervoltageorovervoltage)2.NominalVoltagerating.(Ifotherthan110voltsacsuitable
interposingVTswillhavetobeused.)3.Numberandtype(Standardorblowoutmagnet)of‘Make’
and‘Break’contactsrequired.4.Whetheroperationindicatorrequired.Ifsowhetheranyflag
inscriptionisrequired.5. Voltageratingoftheauxiliaryunit(*)6. Typeofmounting–flushorprojection.
(*)Itispreferabletohaveadcorseparateacauxiliaryvoltagesupplyfortheauxiliaryunit.
ALSTOMT&DINDIALIMITEDPallavaramWorks19/1,G.S.T.Road,Pallavaram,Chennai-600043Tel:91-44-22648000Fax:91-44-22640040
ALSTOMT&DWorldwideContactCentre:http://www.alstom.com/contactcentre/Tel.:+44(0)1785250070
www.grid.alstom.com
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Type VAGM 22