Question

Circuits

a. Determine the equivalent (Thevenin) circuit at the fault point (FX)

b. Determine the operation time of the four overcurrent elements at the 115 kV side of the transformer, for a phase a-to-ground fault at the point indicated on the13.8kV line, very close to the bus. These relays are connected to CT's with CTR=200/5. The phase relays have I pick-up=5 A, TD=2; and the ground element has Ipick-up=1 A and TD=3. All the relays have U.S. very inverse curve.(Assume transformer is Dyn1)


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