UBase
Current Start Level
StartCurr
VDepFact * StartCurr
UHighLimit
0,25
IEC10000123-1-en.vsd
IEC10000123 V1 EN
Figure 126: 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)
UBase
Current Start Level
StartCurr
VDepFact * StartCurr
UHighLimit
IEC10000124-1-en.vsd
IEC10000124 V1 EN
Figure 127: 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).
1MRK 502 048-UEN A Section 8
Current protection
253
Technical manual
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