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SENTRON
Configuration manual
Selectivity With Three Identical Incoming Feeders; Fault Within The Protection Zone Of The Downstream Protective Device - Siemens SENTRON Configuration Manual
Protective devices selectivity for 3va molded case circuit breakers
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Selectivity with parallel incoming feeders
5.2 Selectivity with three identical incoming feeders
5.2
Selectivity with three identical incoming feeders
5.2.1
Fault within the protection zone of the downstream protective device
With three parallel-connected transformers, effective current selectivity can be achieved
because the characteristic displacement factor for the incoming feeder circuit breakers Q1,
Q2 and Q3 is within the range 2 < K
①
Characteristic displacement factor
②
Total short-circuit current
60
≤ 3.
t-I
Selectivity for 3VA molded case circuit breakers
Configuration Manual, 08/2016, A5E03603181010-01
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