ABB Relion 650 Series Technical Manual page 499

1MRK 506 326-UUS B
POSCLOSE
POSOPEN
I3P
GUID-60ADC120-4B5A-40D8-B1C5-475E4634214B-ANSI V1 EN-US
Figure 254: Functional module diagram for monitoring circuit breaker status
Phase current check
This module compares the three phase currents with the setting
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 CBOPEN, CBINVPOS and 52a for
open, intermediate and closed position respectively.
13.17.7.2 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.
GUID-82C88B52-1812-477F-8B1A-3011A300547A V1 EN-US
Figure 255: Functional module diagram for calculating inactive days and alarm for circuit
Inactivity timer
The module calculates the number of days the circuit breaker has remained inactive, that is, has
stayed in the same open or closed state. The calculation is done by monitoring the states of the
POSOPEN and POSCLOSE auxiliary contacts.
The inactive days NOOPRDAY is available through the Monitored data view. It is also possible to set
the initial inactive days by using the
Line distance protection REL650
Technical manual
I_A
Phase
I_B
current
check
I_C
breaker operation monitoring
InactDayInit parameter.
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CBOPEN
Contact
position CBINVPOS
indicator
52a
AccDisLevel . If the current in a
Section 13
Monitoring
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