KYORITSU 6050 - Operating Errors of trip current (IEC 61557-6); LOOP IMPEDANCE; PSC TESTS

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5.LOOPIMPEDANCE/PSCTESTS
5.1PrinciplesofMeasurement
5.1-1MeasurementofFaultLoop ImpedanceandProspectiveFault
Current
Ifan electrical installation is protected by over- current protective devices
includingcircuitbreakersorfuses,theearthfaultloopimpedanceshouldbe
measured.
Intheeventofafaulttheearthfaultloopimpedanceshouldbelowenough
Function Operatingerroroftripcurrent
×1/2 -10%〜0%
×1 0%〜+10%
×5 0%〜+10%
AutoRamp -10%〜+10%
● OperatingErrorsoftripcurrent(IEC61557-6)
Theinfluencingvariationsusedforcalculatingtheoperatingerrorare
denotedasfollows:
Temperature:0℃ and40℃
Earthelectroderesistance:
I n(mA)
10
30
100
300
500
1000
Earthelectroderesistance(Ω)
UL50V
2000
600
200
130
80
40
UL25V
2000
600
200
65
40
20
table.1
Systemvoltage:230V+10%-15%
Supplyvoltage:8Vto13.8V