ABB REG650 Technical Manual page 220

Section 7
Current protection
214
• Voltage restraint overcurrent (when setting parameter VDepMode = Slope)
Current Start Level
StartCurr
VDepFact * StartCurr
IEC10000123 V1 EN
Figure 110: Example for current start level variation as function of measured
voltage magnitude in Slope mode of operation
• Voltage controlled overcurrent (when setting parameter VDepMode = Step)
Current Start Level
StartCurr
VDepFact * StartCurr
IEC10000124 V1 EN
Figure 111: Example for current start level variation as function of measured
voltage magnitude in Step mode of operation
This feature simply changes the set overcurrent start level in accordance with
magnitude variations of the measured voltage. This feature also affects the start
current value for the calculation of operate times for IDMT curves (the overcurrent
with IDMT curve operates faster during low voltage conditions).
0,25 UHighLimit
UHighLimit
1MRK 502 034-UEN -
UBase
IEC10000123-1-en.vsd
UBase
IEC10000124-1-en.vsd
Technical Manual