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A) If low resistance configuration is chosen, then, ground fault current is greater than 25% of 3-phase value.

B) If high resistance configuration is chosen, then, ground fault current is between 1 to 5% of 3-phase value.

C) Ground fault protection scheme is important because affects resistor thermal rating, hence size.

D) For B) above, ground fault current must not be less than system charging current produced by phase to ground capacitance in 11 kV system.

E) For D) above, total capacitance calculation must include line to ground capacitance of cables, motors, Transformers, and (often forgotten) surge protection capacitors, as well as lightning arrestors. shirish prajapati

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