User Manual

DIR 1000587R0002 (L3821)
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2.1.3 Environmental characteristics
Operatingtemperature -25°C...+70°C
Storagetemperature -40°C...+90°C
Relativehumidity 0%...98%withcondensation
Degreeofprotection(withLSIGinstalledintheCB) IP30
2.1.4 Protection functions
TheLSIGprotectionunitcarriesout5independentprotectionfunctions,i.e.:
1.  Protectionagainstoverloadwithinversetime“L”;
2.  Protectionagainstshort-circuitwithadjustabledelay“S”;
3.  Protectionagainstinstantaneousshort-circuit“I”;
4.  Protectionagainstearthfaultwithadjustabledelay“G”;
5.  Protectionagainstinstantaneousshortcircuitathighcurrents“Iinst”.
TheLSIGunitallowsprocessingofcurrentsignalofneutralpolewithdifferentrelationshipsrelativetothevalueofthephases.
N.B.: Beyond 15.5xIn of current on the Ne, the protection is considered as being set to 100%.
Atimingindication(“alarm”LED)isprovidedonfrontsideofunit,whichisenabledduringanalarmforeachprotection.Itisdisabledwhenthe
alarmconditionceasesorwhentheprotectionhasbeentripped.
Theunithasa“backup-protection”function.IfthecircuitbreakerdoesnotopenimmediatelythersttimetheTripCoilishit(partialTCfailure),
TRIPcommandsaresentrepeatedlyuntilthecircuitbreakeropens.
Forinverse-timeprotections,therelationshipbetweentriptimeandovercurrentisgivenbytheformula:t=k/I
2
.
Forxed-timeprotectionswithanadjustabledelay,therelationshipadoptedisasfollows:t=k.
2.1.4.1 RMS calculation
Allprotectionfunctionsperformtheirrespectiveprocessingcyclesonthebasisofrealrmsvalueofcurrents(protectionGisdisabledforcurrent
valuesgreaterthan8In(whereI
4
≥0.8In),greaterthan6In(where0.5In≤ I
4
<0.8In)andgreaterthan4In(whereI
4
<0.5In)).
Ifthewaveformisdistortedbeyondtheestablishedlimit(6.3@2In),thetoleranceforthecalculationofthetruermsvaluewillincrease.
2.1.4.2 Watchdog
TheLSIGunitprovidessomewatchdogfunctionswhichcanguaranteepropermanagementofrelaymalfunctions.Thesefunctionsareasfollows:
 RatingPlugvalidity
 Watchdogforproperconnectionofcurrentsensors(CS).AnyfaultsareindicatedbyaglowingLED,asexplainedinpar.2.7.1.
 Watchdogforproperopeningsolenoidconnection(TC).AnyfaultsareindicatedbyaglowingLED,asexplainedinpar.2.7.1.
2.1.5 Description of protection functions
2.1.5.1 Protection “L”
"L”istheonlyprotectionthatcannotbedisabledbecauseitisforself-protectionagainstoverloadingoftherelay.
Thetypeofcurvethatcanbesetist=k/I
2
.
Protectiontriptime-inversetime-isgivenbytheexpression:
max
9t
1
(I /I)
f1
2
,1
wherel
f
≤12In,1swherel
f
> 12In
I
f
isthefaultcurrentandI
1
theprotectionthresholdsetbyuser.
NB:Timeexpressedinseconds.
2.1.5.2 Protection “S”
Thisprotectioncanbedisabled;itcanbeofthexedtime(t=k)orinversetime(t=k/I
2
)type.Inthelattercase,triptimeisgivenbytheexpression
max
100 t
2
(I )
f
2
,t
2
/I
n
wherel
f
>l
2
I
f
isthefaultcurrentandI
2
theprotectionthresholdsetbyuser.
NB:Timeexpressedinseconds.
2.1.5.3 Protection “I”
Thisxedtime(t=k)protectioncanbedisabledandisdesignedforanilintentionaldelay.
2.1.5.4 Protection “G”
Thisprotectioncanbedisabled;itcanbeofthexedtime(t=k)orinversetime(t=k/i
2
)type.Inthelattercase,triptimeisgivenbytheexpression
wherel=l
f
/l
4
I
f
isthefaultcurrentandI
4
theprotectionthresholdsetbyuser.
NB:Timeexpressedinseconds.