Circuit-Breaker Wear Monitoring
Overview of Functions
The Circuit-breaker wear monitoring function:
•
Records the wear of circuit breakers
•
Allows maintenance intervals of the CB poles to be carried out when their actual degree of wear makes it
necessary
•
Sends a warning signal when the wear of a circuit breaker reaches a specified degree
•
Allows the supervision of the circuit-breaker make time
Savings on maintenance and servicing costs is one of the main benefits this functionality offers.
Structure of the Function
The Circuit-breaker wear monitoring function can be used in the Circuit-breaker function group.
The function offers 4 independent operating stages with different measuring methods:
•
ΣI
x
-method stage
Sum of tripping current powers
•
2P-method stage
2 points method for calculating the remaining switching cycles
•
I
2
t-method stage
Sum of all squared fault-current integrals
•
Supv.CB make time stage
Supervision of the circuit-breaker make time
The function is preconfigured by the manufacturer with 1 ΣI
x
-method stage. A maximum of 1 ΣI
x
-method
stage, 1 2P-method stage, 1 I
2
t-method stage, and 1 Supv.CB make time stage can be operated simultane-
ously within this function.
The general functionality is available across stages and provides a uniform start criterion for the stages.
[DwCBWear, 2, en_US]
Figure 10-30 Structure/Embedding of the Function
10.12
10.12.1
10.12.2
Measured Values, Energy Values, and Supervision of the Primary System
10.12 Circuit-Breaker Wear Monitoring
SIPROTEC 5, Overcurrent Protection, Manual 1353
C53000-G5040-C017-8, Edition 07.2017
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