ABB REG670 - Page 588

Selected Voltage
Magnitude
OC1 Stage Pickup Level
StartCurr_OC1
VDepFact_OC1 * StartCurr_OC1
UHighLimit_OC1ULowLimit_OC1
en05000324.vsd
IEC05000324 V1 EN
Figure 274: 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)
Selected Voltage Magnitude
OC1 Stage Pickup Level
StartCurr_OC1
VDepFact_OC1 * StartCurr_OC1
UHighLimit_OC1
en05000323.vsd
IEC05000323 V1 EN
Figure 275: 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 curves
(overcurrent with IDMT curve will operate faster during low voltage conditions).
Section 11 1MRK502052-UEN B
Multipurpose protection
582
Technical manual