ABB RELION 620 Series Technical Manual page 570

Section 6
Supervision functions
6.1.4.2
564
A071104 V3 EN
Figure 278: 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.
1MAC504801-IB E
620 series ANSI
Technical Manual