2P-Method Stage
Description
Logic of the Stage
[LoCBW2PS, 2, en_US]
Figure 10-35
Logic of the 2P-Method Stage
Determination of the Tripping/Opening Current Value
For the description to determine the tripping/opening current value, refer to chapter 10.12.4.1 Description.
Calculation of Remaining Switching Cycles
A double-logarithmic diagram provided by the circuit-breaker manufacturer illustrates the relationship of
permitted switching cycles and the tripping/opening current, see the following figure. According to the
example, this circuit breaker can operate approximately 1000 times at a tripping current of 10 kA.
2 points and their connecting line determine the relationship of switching cycles and tripping current. Point P1
is determined by the number of permitted switching cycles at rated normal current I
rated
. Point P2 is deter-
10.12.5
10.12.5.1
Measured Values, Energy Values, and Supervision of the Primary System
10.12 Circuit-Breaker Wear Monitoring
1360 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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