Circuit Breaker Status - ABB RES670 Technical Manual

Section 16
Monitoring
16.4.7.2
16.4.7.3
540

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 210.
I3P-ILRMSPH
POSCLOSE
POSOPEN
IEC12000613 V3 EN-US
Figure 210: 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 211.
Phase current
check
Contact
position
indicator
1MRK 511 408-UUS A
GUID-390A1250-B258-4023-9A7D-0D7E19E13A6C v12
OPENPOS
CLOSEPOS
INVDPOS
IEC12000613-3-en.vsd
GUID-C347406A-2B6F-42BD-B70B-51489AB51EAE v12
Phasor measurement unit RES670 2.2 ANSI
Technical manual