Two synchronous motors having subtransient reactances of 0.8 and 0.25 p.u., respectively, on a base of 500 V 2 MVA are connected
to a bus. This motor bus is connected by a line having a reactance of 25 mΩ to a bus of a power system. At the power system bus the short circuit MVA of the power system is 12.5 MVA for a nominal voltage of 500 V. A symmetrical bolted three phase fault occurs at the motor terminals when the voltage at the motor bus is 450 V.
a) Calculate the fault current. Neglect the load current.
a) Calculate the fault current. Neglect the load current.
1 answer:
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Answer:
Explanation:
From the question we are told that:
Incremental resistance
Resistor Feed
Supply Change
Generally the equation for voltage rate of change is mathematically given by
Therefore