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    • P998 D24-4, Jul 2024 - UNAPPROVED DRAFT
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Full Description

Scope

This guide describes the general nature of lightning and discusses design methods for placement of masts and shield wires to provide direct stroke shielding of outdoor substations.Tables, formulas, and examples are provided to calculate effective shielding from direct lightning strokes. This guide specifically does not include: 1) every shielding design method that may have been developed 2) protection from surges entering a substation over power or communication lines 3) personnel safety issues

Purpose

Direct strokes from lightning can damage substation equipment and bus work. To protect equipment, substation engineers can install direct stroke lightning shielding. This guide is intended to provide engineers with information pertaining to the interception of damaging direct lightning strokes to outdoor substations. Users of this guide should consider the factors that relate to the design of a particular installation and use engineering judgment in the application of these methods, particularly with respect to the importance and value of the equipment being protected.

Abstract

Revision Standard - Active - Draft. Design information for the methods historically and typically applied by substation designers to reduce direct lightning strokes to equipment and buswork within substations is provided. Two approaches, the classical empirical method and the electro-geometric model, are presented in detail. A third approach, which involves the use of non-conventional lightning terminals and related design methods, is also reviewed.