Setting Guidelines - ABB RELION RET670 Applications Manual

1MRK 504 163-UUS A
18.4.3
18.4.3.1
Transformer protection RET670 2.2 ANSI
Application manual

Setting guidelines

The breaker monitoring function is used to monitor different parameters of the circuit
breaker. The breaker requires maintenance when the number of operations has reached
a predefined value. For proper functioning of the circuit breaker, it is also essential to
monitor the circuit breaker operation, spring charge indication or breaker wear, travel
time, number of operation cycles and accumulated energy during arc extinction.
Setting procedure on the IED
The parameters for breaker monitoring (SSCBR) can be set using the local HMI or
Protection and Control Manager (PCM600).
Common base IED values for primary current (IBase), primary voltage (VBase) and
primary power (SBase) are set in Global base values for settings function GBASVAL.
GlobalBaseSel: It is used to select a GBASVAL function for reference of base values.
Operation: Enabled or Disabled.
IBase: Base phase current in primary A. This current is used as reference for current
settings.
OpenTimeCorr: Correction factor for circuit breaker opening travel time.
CloseTimeCorr: Correction factor for circuit breaker closing travel time.
tTrOpenAlm: Setting of alarm level for opening travel time.
tTrCloseAlm: Setting of alarm level for closing travel time.
OperAlmLevel: Alarm limit for number of mechanical operations.
OperLOLevel: Lockout limit for number of mechanical operations.
CurrExponent: Current exponent setting for energy calculation. It varies for different
types of circuit breakers. This factor ranges from 0.5 to 3.0.
AccStopCurr: RMS current setting below which calculation of energy accumulation
stops. It is given as a percentage of IBase.
ContTrCorr: Correction factor for time difference in auxiliary and main contacts'
opening time.
AlmAccCurrPwr: Setting of alarm level for accumulated energy.
LOAccCurrPwr: Lockout limit setting for accumulated energy.
Section 18
Monitoring
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