Selectivity With Parallel Incoming Feeders - Siemens SENTRON Configuration Manual
Protective devices selectivity for 3va molded case circuit breakers
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Selectivity with parallel incoming feeders
Selectivity with parallel incoming feeders can be implemented in various different scenarios.
The following scenarios are presented in this chapter:
● Selectivity with two identical incoming feeders
● Selectivity with three identical incoming feeders
● Selectivity with incoming feeders connected in parallel via bus-couplers
Total short-circuit current and current scale
If multiple transformers are operated on a common busbar, the following applies:
The partial short-circuit currents I
the total short-circuit current I
The total short-circuit current I
This offers the advantage of making the selectivity conditions more favorable for all
protective devices downstream of the incoming feeder circuit breaker. This applies to all
types of fault.
Selectivity for 3VA molded case circuit breakers
Configuration Manual, 08/2016, A5E03603181010-01
of the incoming feeders are added together to produce
K-Ti
in a faulty feeder.
kΣ
forms the basis for the current scale in the grading diagram.
kΣ
5
57
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