Application - Hitachi Relion 670 Series Applications Manual
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Also See for Relion 670 Series:
- Applications manual (438 pages) ,
- Commissioning manual (284 pages) ,
- Product manual (192 pages)
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1MRK511407-UUS Rev. N
Function description
Breaker monitoring
16.4.2
Application
The circuit breaker maintenance is usually based on regular time intervals or the number of operations
performed. This has some disadvantages because there could be a number of abnormal operations or
few operations with high-level currents within the predetermined maintenance interval. Hence, condition-
based maintenance scheduling is an optimum solution in assessing the condition of circuit breakers.
Circuit breaker contact operation time
Auxiliary contacts provide information about the mechanical operation, opening time and closing time of a
breaker. Detecting an excessive operation time is essential to indicate the need for maintenance of the
circuit breaker mechanism. The excessive operation time can be due to problems in the driving
mechanism or failures of the contacts.
Circuit breaker status
Monitoring the breaker status ensures proper functioning of the features within the protection relay such
as breaker control, breaker failure and autoreclosing. The breaker status is monitored using breaker
auxiliary contacts. The breaker status is indicated by the binary outputs. These signals indicate whether
the circuit breaker is in an open, closed or error state.
Remaining life of circuit breaker
Every time the breaker operates, the circuit breaker life reduces due to wear. The wear in a breaker
depends on the interrupted current. For breaker maintenance or replacement at the right time, the
remaining life of the breaker must be estimated. The remaining life of a breaker can be estimated using
the maintenance curve provided by the circuit breaker manufacturer.
Circuit breaker manufacturers provide the number of make-break operations possible at various
interrupted currents. An example is shown in figure 101.
Phasor measurement unit RES670
Application manual
IEC 61850
identification
SSCBR
© 2017 - 2023 Hitachi Energy. All rights reserved
IEC 60617
ANSI/IEEE C37.2
identification
device number
-
-
Section 16
Monitoring
GUID-45572680-3A39-4B3C-8639-4E4C5A95AA26 v11
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