Circuit Breaker Status - ABB RED615 Technical Manual

1YHT530004D05 D
7.1.4.1
7.1.4.2
615 series
Technical Manual

Circuit breaker status

The circuit breaker status subfunction monitors the position of the circuit breaker,
that is, whether the breaker is in an open, closed or intermediate 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 331: 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 circuit breaker status is open if the auxiliary input contact POSCLOSE is low,
the POSOPEN input is high and the current is zero. The circuit breaker is closed
when the POSOPEN input is low and the POSCLOSE input is high. The breaker is
in the intermediate position if both the auxiliary contacts have the same value, that
is, both are in the logical level "0", or if the auxiliary input contact POSCLOSE is
low and the POSOPEN input is high, but the current is not zero.
The status of the breaker is indicated with the binary outputs OPENPOS,
INTERMPOS and CLOSEPOS for open, intermediate 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 7
609