ABB 615 Series ANSI, Technical Manual

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Section 6
1MAC050144-MB C
Supervision functions
418 615 series ANSI
Technical Manual
breaker status monitoring can be described by using a module diagram. All the modules in
the diagram are explained in the next sections.
Figure 212: Functional module diagram for monitoring circuit breaker status
Phase current check
This module compares the three phase currents with the setting . If the current in a phase
exceeds the set level, information about 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.
6.1.4.2 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 by using a
module diagram. All the modules in the diagram are explained in the next sections.