What are the instantaneous operating times of a protection function?
The Sepam series 20 and series 40 manuals give the operating time for 2 types of outputs:
- pick-up which is the non-confirmed instantaneous output: e.g. for phase O/C 50/51, T<35ms
- instantaneous which is the output that can be used for tripping: this is the confirmed instantaneous operating time: e.g. for phase overcurrent protection 50/51, T<50ms
Note:
- pick-up time is included in the specified operating time (the 2 times are not added together)
- pick-up time is common to all the non-confirmed outputs of the protection functions in operation, according to the parameter setting of the matrix
Released for: Schneider Electric Canada
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