Table of Contents

1 Overview
1.1 Scope
1.2 Purpose
1.3 Disclaimer
2 References
3 Definitions and Acronyms
3.1 Definitions
3.2 Acronyms
4 Route selection
4.1 Lightning frequency of incidence
4.2 Route effects
4.3 Structure height
4.4 Soil resistivity
4.5 Adjacent environment
5 Shielding
5.1 Shielding angle
5.2 The final leader step
5.3 Structure height
5.4 Shielding and engineering
5.5 Shielding of the center phase
5.6 Overhead ground wire size and operating losses
6 Insulation
6.1 Effect of voltage waveshapes
6.2 Effect of insulation levels and insulation type
6.3 Wood or fiberglass in series with insulators
6.4 Effect of power-line voltage
7 Tower footing impedance
7.1 Composite line performance
7.2 Supplemental grounding
7.3 Counterpoise
7.4 Resistance of complex footings
7.5 Special grounding effects
8 Special methods of improving lightning performance
8.1 Additional shield wires
8.2 Guy wires on transmission towers
8.3 Ground wire on separate structures
8.4 Line surge arresters
8.5 Unbalanced insulation on double-circuit lines
8.6 Active air terminals
Annex A (informative) Isolated bonding of wooden structures
Annex B (normative) The FLASH program
Annex C (informative) Bibliography

Abstract

This standard explains the choices that will improve or degrade lightning performance. Sections of this document describe the effects of routing, structure type, insulation, shielding and grounding. An extra section discusses several special methods, which may be used to improve lightning performance.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Institute of Electrical & Electronics Engineers
Pages
ISBN