Two motors having transient reactances 0.3 p.u. and subtransient reactances 0.2 p. u. based on their own ratings of 6 MVA, 6.8 KV are supplied by a transformer rated 15 MVA, 112 KV / 6.6 KV and its...

Two motors having transient reactances 0.3 p.u. and subtransient reactances 0.2 p. u. based on

their own ratings of 6 MVA, 6.8 KV are supplied by a transformer rated 15 MVA, 112 KV / 6.6

KV and its reactance is 0.18 p.u. A 3-phase short circuit occurs at the terminals of one of the

motors. Calculate (a) the subtransient fault current (b) subtransient current in circuit breaker A

of 4 cycles calculate the current to be interrupted by the circuit breaker A.

Aug 25, 2022

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