Restrike Detection - ABB REC670 Applications Manual

Section 8
Current protection
8.15.3.1
234
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

Restrike detection

Opening of SCBs can be quite problematic for certain types of circuit breakers (CBs).
Typically such problems are manifested as CB restrikes.
1MRK 511 401-UUS A
GUID-114747A5-0F7C-4F48-A32D-0C13BFF6ADCE v1
Bay control REC670 2.2 ANSI
Application manual