User Manual

DIR 1000587R0002 (L3821)
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TheLSIGunitcanprovideearthfaultprotection,achievedinsidetherelaybyvectoriallyaddingtogetherphaseandneutralcurrents.Faultcurrent
isdenedbythefollowingformula:
Ifthecircuitshowsnofaults,themoduleofthesumofthesecurrentsisalwaysnil;viceversa,thevalueofthefaultcurrenttakesonalargerand
largervaluedependingonsizeoffault.
2.1.5.5 Protection against instantaneous short-circuit “Iinst”
Thisfunctionhasasinglexed-timeprotectioncurve.
Whentheprotectionistripped,thecircuitbreackerisopenedbytheopeningsolenoid(TC).
2.1.6 Summary table of protections
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 Theminimumvalueofthistripis1sregardlessofthetypeofcurveset(self-
protection).
(2)
 Thesetolerancesapplyunderthefollowingconditions:
- self-powered relay at full power (without start-up)
- presence of auxiliary power supply
- two-phase or three-phase power supply
 - presettriptime ≥100ms
(3)
Thevalueofthistripisensuredinsidethetimewindowrangingfrom40to
500msfromCBclosing;thissettingmustbedonebycustomer.
Forallcases notcovered by the above assumptions, the following tolerance
valuesapply
Protections Trip threshold Trip time
L Releasebetween1.05and1.25xI1 ±20%
S ±10%  ±20%
I ±15% ≤ 60ms
G ±10%  ±20%
Others ±20%
Disabling
Trip threshold Trip time Trip threshold
tolerance
(2)
Protection
Trip time
tolerance
(2)
L I1 =  0.4-0.425-0.45-0.475-0.5-  Releasebetween
(t=k/I
2
)   0.525-0.55-0.575-0.6-0.625- t1=3-12-24-36-48-72 1.05and1.2xI1 ±10%I
g
≤6xIn
   0.65-0.675-0.7-0.725-0.75- 108-144s
(1)
±20%I
g
>6xIn
   0.775-0.8-0.825-0.85-0.875- @3I1
   0.9-0.925-0.975-1xIn
S  I2 =  0,6-0,8-1,2-1,8-2,4-3-3,6-4,2 withI>I2 ±7%I
g
≤6xIn Thebestofthetwodata:
(t=k)   5-5,8-6,6-7,4-8,2-9-10xIn t2=0.1-0.2-0.3-0.4-0.5-0.6 ±10%I
g
>6xIn ±10%or±40ms
       0.7-0.8s
S  I2 =  0,6-0,8-1,2-1,8-2,4-3-3,6-4,2 t2=0.1-0.2-0.3-0.4-0.5-0.6 ±7%I
g
≤6xIn ±15%I
g
≤6xIn
(t=k/I
2
)   5-5,8-6,6-7,4-8,2-9-10xIn 0.7-0.8s ±10%I
g
>6xIn ±20%I
g
>6xIn
       @10In
I  I3 =  1,5-2-3-4-5-6-7-8-9-10- ≤30ms ±10% 
(t=k)   11-12-13-14-15xIn    
G  I4 =  0.2-0.3-0.4-0.6-0.8-0.9- withI>I4 ±7% Thebestofthetwodata:
(t=k)   1xIn    t4=0.1-0.2-0.4-0.8s  ±10%or±40ms
       t4=0.1@4.47I4
G  I4 =  0.2-0.3-0.4-0.6-0.8-0.9- t4=0.2@3.16I4 ±7% ±15%
(t=k/I
2
)   1xIn    t4=0.4@2.24I4
t4=0.8@1.58I4
I inst  Automatic,denedbyAB  Instantaneous 
2.1.7 Measurements
TheLSIGprotectionunitcanperformdifferenttypesofmeasurementsshowninthefollowingtablewithrelevanttolerances.
Typeofmeasurement  Tolerance
  Range %
Phaseandneutralcurrent 0.3...6In 1.5
Earthfaultcurrent  0.3...4In 1.5
2.2Otherfunctions
2.2.1 Indication of trip cause and trip test button
Usingthe“iTest”button,anyinformationstoredinthepast48hourscanberetrieved.Inaddition,atriptestcanbeobtainedbykeepingthebutton
pressedfor7seconds,andautotestbykeepingbuttonpressedfor3seconds,withbatteryunitonandwithnorunningcurrent.