ABB Relion 670 series - Page 1064

POSCLOSE
POSOPEN
BLOCK
BLKALM
Inactive timer
Alarm limit
Check
INADAYS
MONALM
IEC12000614 V2 EN-US
Figure 552: Functional module diagram for circuit breaker operation monitoring
Inactive timer
The Inactive timer module calculates the number of days the circuit breaker has remained in the
same open or closed state. The value is calculated by monitoring the states of the POSOPEN and
POSCLOSE auxiliary contacts.
The number of inactive days INADAYS is available as a service value. The initial number of inactive
days is set using the InitInactDays parameter.
Alarm limit check
MONALM is initiated when the number of inactive days and hours exceed the limit value defined by
the
InactiveAlDays and InactivAlHrs setting. The alarm signal MONALM can be blocked by activating
the binary input BLKALM.
16.4.7.7 Circuit breaker spring charge monitoring
GUID-F850A940-7890-4C37-8B31-6C7D5B30E582 v9
The circuit breaker spring charge monitoring subfunction calculates the spring charging time. The
operation is described in Figure 553.
SPRCHRD
BLOCK
BLKALM
Spring charging
time
measurement
Alarm limit
Check
SPRCHRST
RSTSPCHT
SPCHT
SPCHALM
IEC12000621 V2 EN-US
Figure 553: Functional module diagram for circuit breaker spring charge indication
Spring charging time measurement
The binary input SPRCHRST indicates the pickup of circuit breaker spring charging time. SPRCHRD
indicates that the circuit breaker spring is charged. The spring charging time is calculated from
the difference of these two signal timings. Spring charging indication is described in Figure
553.
The last measured spring charging time SPCHT is provided as a service value. The spring charging
time SPCHT can be reset on the LHMI or by activating the input RSTSPCHT.
Section 16 1MRK 502 066-UUS B
Monitoring
1058
Technical manual