IEEE C62.23:1995 (R2001)

New IEEE Standard - Superseded.
This standard consolidates most electric utility power industry practices, accepted theories, existing standards/guides, definitions, and technical references as they specifically pertain to surge protection of electric power generating plants. Where technical information is not readily available, guidance is provided to aid toward proper surge protection and to reduce interference to communication, control, and protection circuits due to surges and other overvoltages. It has to be recognized that this application guide approaches the subject of surge protection from a common or generalized application viewpoint. Complex applications of surge protection practices may require specialized study by experienced engineers.

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.