Hitachi Relion 650 Series Technical Manual page 269

1MRK 511 557-UEN Rev. A
•
•
•
3. Apart from monitoring of electrical or mechanical parameters, the function also monitors,
evaluates, or detects parameters which consider both electrical and mechanical feedbacks.
These parameters are:
•
•
•
•
•
Technical Manual
• Initial mechanical delay (time from breaker trip command to status change of NO)
• Operating time (time from command to primary contact separation)
Mechanical closing time which includes,
• Initial mechanical delay (time from breaker close command to status change of
NC)
• Operating time (time from breaker close command to primary contact touch)
Movement time (time interval between status changes of NC and NO)
Circuit breaker unstable operating times
Detection and monitoring of external operation (circuit breaker status change not initiated
by this IED)
Contradicting electrical and mechanical status
Operation count (Close-Open cycles)
Count of point-on-wave controlled Close and Open operations
Consolidated CB status
© 2021 Hitachi Energy. All rights reserved.
Section 12
Monitoring
263