Circuit Breaker Status; Circuit Breaker Operation Monitoring - ABB Relion SMU615 Technical Manual

1MRS758407 B
6.1.4.1
6.1.4.2
SMU615
Technical Manual

Circuit breaker status

The Circuit breaker status sub-function monitors the position of the circuit breaker,
that is, whether the breaker is in open, closed or invalid position. The operation of the
breaker status monitoring can be described by using a module diagram. All the
modules in the diagram are explained in the next sections.
A071104 V3 EN
Figure 106: Functional module diagram for monitoring circuit breaker status
Phase current check
This module compares the three phase currents to the setting Acc stop current. If the
current in a phase exceeds the set level, information about the phase is reported to the
contact position indicator module.
Contact position indicator
The OPENPOS output is activated when the auxiliary input contact POSCLOSE is
FALSE, the POSOPEN input is TRUE and all the phase currents are below the setting
Acc stop current.
The CLOSEPOS output is activated when the auxiliary POSOPEN input is FALSE and
the POSCLOSE input is TRUE.
The INVALIDPOS output is activated when both the auxiliary contacts have the same
value, that is, both are in the same logical level, or if the auxiliary input contact
POSCLOSE is FALSE and the POSOPEN input is TRUE and any of the phase currents
exceed the setting Acc stop current.
The status of the breaker is indicated by the binary outputs OPENPOS, INVALIDPOS
and CLOSEPOS for open, invalid and closed position respectively.

Circuit breaker operation monitoring

The purpose of the circuit breaker operation monitoring subfunction is to indicate if
the circuit breaker has not been operated for a long time.
The operation of the circuit breaker operation monitoring can be described with a
module diagram. All the modules in the diagram are explained in the next sections.
Condition monitoring functions
Section 6
155