6. A 30 MVA generator with 15% reactance is connected to a busbar. A 25 MVA transformer with 10% reactance is also connectedthrough a 10% bus bar reactor to the same bus bar. Both of thesereactance is based on 25 MVA. If a feeder taken out from the busbars through a circuit breaker develops a three-phase fault, whatshould be the appropriate rating of the circuit breaker?
7. A system operates at 220 kVA and 11 kV. Using thesequantities as base values, find the base impedance for thesystem.
