EMR-4000 IM02602009E
Breaker Wear Curve
In order to keep the breaker in good working condition, the breaker needs to be monitored. The breaker health
(operation life) depends above all on:
The number of CLOSE/OPEN cycles and
The amplitudes of the interrupting currents.
The User has to maintain the breaker accordingly to the maintenance schedule that is to be provided by the
manufacturer (breaker operation statistics). By means of up to ten points that the User can replicate the breaker wear
curve within menu [Control/Breaker/BWear]. Each point has two settings: the interrupt current in kilo amperes and the
allowed operation counts. The first point is always the number of allowed operations if no current is flowing (zero
current). No matter how many points are used, the operation counts the last point as zero. The protective relay will
interpolate the allowed operations based on the breaker wear curve. When the interrupted current is greater than the
interrupt current at the last point, the protective relay will assume zero operation counts.
www.eaton.com 402
0.1 1 10 100
1
10
100
1 10
3
×
1 10
4
×
0.0
10000
1.2
10000
8.0
150
20.0
12
20.0
0
Breaker Maintenance Curve for a typical 25kV Breaker
Number of Operations
Interrupted Current in kA per operation
To Next Page
Loading...
