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A 20 MVA, 6

Electrical Engineering

A 20 MVA, 6.6KV, 3phase alternator is connected to a 3-phase transmission line. The whole transmission line has a two-machine power system. Two ground faults take place at two different locations. The neutral of the alternator is connected to ground, the alternator is connected with unloaded synchronous generator operating at it's rate, where the fault occurs at the terminals, the sequence component of the fault current are as follows- ?Ipositive?=j1.5pu? , ?Inegative?? = -j0.5 pu.

Determine all the types of the faults occured in the circuit. Calculate value of the fault occured. Calculate the resistance and the shunt susceptances of the system. Calculate the voltage and the current at the point of the fault. Determine the types of the relays engage in the whole system. Design the whole system of circuit and also suitable spots for circuit breaker.

 

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