Selectivity with parallel incoming feeders
5.1 Selectivity with two identical incoming feeders
Selectivity for 3VA molded case circuit breakers
58 Configuration Manual, 08/2016, A5E03603181010-01
5.1 Selectivity with two identical incoming feeders
The figure below shows an example of the distribution of short-circuit currents in a faulty
outgoing feeder that is supplied by two parallel-connected transformers with the same power
rating.
① Characteristic displacement factor
② Total short-circuit current
Figure 5-1 Selectivity with two parallel-connected transformers with the same power rating
A total short-circuit current I
kΣ
which is the sum of the partial short-circuit currents I
k-T1
and
I
k-T2
flows through the fuse F1.
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