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A DG owner wants to interconnect a 5MVA synchronous generator with the locally utility's 13.8kV
distribution system. The utility requires that the available ground fault current from the DG be limited to
100 A-rms at the point of common coupling (PCC). This requires that the step-up transformer be grounded
through an impedance Zn.
Draw the sequence networks to aid in your answers.
4160V - 13.8kV
5 MVA, 4160V
ZT = 3%
ZG1 = ZGo =10%
ZN= ?
If Zo is to be an inductor, specify the value of X, in ohms which satisfies this objective.
b) If Z, is to be a resistor, specify the value of R. in ohms which satisfies this objective. Do not use an
approximation for R. Instead, calculate Ro using circuit analysis similar to X.

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A DG owner synchronous generator - Sol-1.jpg

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