IEEE C62.23-1995

The purpose of this clause is to guide the reader in understanding the nature of surges that can enter the power plant premises via transmission and distribution lines and to indicate methods to reduce their magnitudes. Over voltage surges resulting from lightning strokes and line switching may stress the insulation of power plant equipment, circuits, and systems. This provides information for evaluating line conditions as they affect the surges that may enter the switch yard and power plant.