Description: In this standard the neutral grounding of singleand three-phase AC electric utility primary distribution systems with nominal voltages in the range of 2.4-34.5 kV is addressed. Classes of distribution systems grounding are defined. Basic considerations in distribution system grounding-concerning economics, control of temporary overvoltages, control of ground-fault currents, and ground relaying-are addressed. Also considered are use of grounding transformers, grounding of high-voltage neutral of wye-delta distribution transformers, and interconnection of primary and secondary neutrals of distribution transformers.
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