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Section 16
Monitoring
16.4.7.2
16.4.7.3
532
Circuit breaker status
The circuit breaker status subfunction monitors the position of the circuit breaker, that is,
whether the breaker is in the open, closed or error position. The operation is described in
Figure
199.
I3P-ILRMSPH
POSCLOSE
POSOPEN
IEC12000613 V3 EN
Figure 199:
Functional module diagram for monitoring circuit breaker status
Phase current check
The module compares the phase current I3P-ILRMSPH to the AccStopCurr setting. If the
current in the selected phase exceeds the set level, it is reported to the contact position
indicator module as closed circuit breaker.
Contact position indicator
The circuit breaker status is open when the auxiliary input contact POSCLOSE is low, the
POSOPEN input is high and the phase current is less than the setting AccStopCurr value.
The circuit breaker is closed when the POSOPEN input is low and the POSCLOSE input
is high. The breaker is in the error state if both auxiliary contacts have the same value or
if the auxiliary input contact POSCLOSE is low and the POSOPEN input is high but the
current is above the setting AccStopCurr.
The status of the breaker is indicated with the binary outputs OPENPOS, CLOSEPOS and
INVDPOS for open, closed and error position respectively.
Remaining life of circuit breaker
The Remaining life of circuit breaker subfunction is used to give an indication on the wear
and tear of the circuit breaker. Every time the breaker operates, the life of the circuit
breaker reduces due to wear. The breaker wear depends on the interrupted current. The
remaining life of the breaker is estimated from the circuit breaker trip curve provided by
the manufacturer. The remaining life is decreased by at least one when the circuit breaker
is opened. The operation of the remaining life of circuit breaker subfunction is described
in
Figure
200.
Phase current
check
Contact
position
indicator
1MRK 511 365-UUS A
OPENPOS
CLOSEPOS
INVDPOS
IEC12000613-3-en.vsd
Phasor measurement unit RES670 2.1 ANSI
Technical manual
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