ABB Relion 650 Series Technical Manual page 106

Section 6
Multipurpose protection
100
• Voltage restraint overcurrent (when setting parameter VDepMode_OC1=Slope)
OC1 Stage Pickup Level
StartCurr_OC1
VDepFact_OC1 * StartCurr_OC1
IEC05000324 V1 EN-US
Figure 36: Example for OC1 step current pickup level variation as function of
measured voltage magnitude in Slope mode of operation
• Voltage controlled overcurrent (when setting parameter
VDepMode_OC1=Step)
OC1 Stage Pickup Level
StartCurr_OC1
VDepFact_OC1 * StartCurr_OC1
IEC05000323 V1 EN-US
Figure 37: Example for OC1 step current pickup level variation as function of
measured voltage magnitude in Step mode of operation
This feature will simply change the set overcurrent pickup level in accordance with
magnitude variations of the measured voltage. It shall be noted that this feature will
as well affect the pickup current value for calculation of operate times for IDMT
ULowLimit_OC1
UHighLimit_OC1
1MRK 511 424-UEN B
UHighLimit_OC1
Selected Voltage
Magnitude
en05000324.vsd
Selected Voltage Magnitude
en05000323.vsd
Bay control REC650 2.2 IEC
Technical manual