PU_37 =70% (of IBase); Current level for undercurrent pickup
tUC =5s; Time delay for undercurrent trip
Undercurrent feature is blocked by operation of Reconnection inhibit
feature.
Reactive power overload feature:
Operation QOL =Enabled; to enable this feature
UP_QOL =130% (of SCB MVAr rating); Reactive power level required for pickup.
Selected value gives pickup recommended by international standards.
tQOL =
60s; Time delay for reactive power overload trip
Harmonic voltage overload feature:
OperationHOL =Enabled; to enable this feature
Settings for definite time delay step
HOL_DT_V =200% (of SCB voltage rating); Voltage level required for pickup
tHOL_DT =10s; Definite time delay for harmonic overload trip
Settings for IDMT delay step
PU_HOL_DT_V =110% (of SCB voltage rating); Voltage level required for pickup of
IDMT stage. Selected value gives pickup recommended by international standards.
k_HOL_IDMT =1.0; Time multiplier for IDMT stage. Selected value gives operate
time in accordance with international standards
tMax_HOL_IDMT =2000s; Maximum time delay for IDMT stage for very low level of
harmonic overload
tMin_HOL_IDMT =0.1s; Minimum time delay for IDMT stage. Selected value gives
operate time in accordance with international standards
8.15.3.1 Restrike detection
GUID-114747A5-0F7C-4F48-A32D-0C13BFF6ADCE v1
Opening of SCBs can be quite problematic for certain types of circuit breakers (CBs).
Typically such problems are manifested as CB restrikes.
Section 8 1MRK 511 401-UUS A
Current protection
234 Bay control REC670 2.2 ANSI
Application manual
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