ABB Relion 670 series, Technical Reference Manual

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Selected Voltage
Magnitude
OC1 Stage Pickup Level
PickupCurr_OC1
VDepFact_OC1 * PickupCurr_OC1
VHighLimit_OC1 VLowLimit_OC1
en05000324_ansi.vsd
ANSI05000324 V1 EN
Figure 290: 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
PickupCurr_OC1
VDepFact_OC1 *
PickupCurr_OC1
VHighLimit_OC1
en05000323_ansi.vsd
ANSI05000323 V1 EN
Figure 291: 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).
1MRK505222-UUS C
Section 10
Multipurpose protection
575
Technical reference manual