Product Id: 1023429
Date Published: Dec 23, 2011
Sector Name: PDU - Transmission and Distribution
Document Type: Technical Results

Abstract
In North America and many other parts of the world, lightning remains the primary cause of transmission line outages, momentary interruptions, and reliability and maintenance problems. The lightning performance of transmission lines may be improved by applying overhead ground wires, providing a low impedance connection to ground, and selecting appropriate insulation levels for the phase conductors. The success of these measures is not always guaranteed, and in many cases, nontrivial design calculations are required.
Increasingly, utilities face the challenge of a skills shortage and the effective transfer of experience-based knowledge from the generation of power engineers involved in the development of extra high voltage (EHV) and ultrahigh voltage (UHV) transmission line designs to young engineers now joining utilities. The Electric Power Research Institute (EPRI) hopes to facilitate this process by collecting all the information on specific topics in a series of reference books.

Background
EPRI is committed to expanding and regularly updating its unique industry reference books to ensure that they provide up- to-date and relevant information while remaining state of the art. With the development of this reference book, EPRI provides the industry with improved access to EPRI research results and a current resource to assist utilities in improving the lightning performance of their overhead transmission lines—thereby improving members' competitive stance in an ever-changing electricity marketplace.

Objective
This reference book provides a self-contained, state-of-the-art resource on lightning and grounding and their effects on transmission line performance. This resource is sufficient for the day-to-day needs of experienced and novice transmission line design and maintenance engineers, inspection personnel, and other design and maintenance stakeholders

Approach
This reference material is based on extensive experience and background in the design, construction, operation, and maintenance of electric transmission networks. This reference book is a living document that will be updated with new sections added and existing sections revised to keep pace with the development of a better understanding of lightning phenomena.

Results
This reference book, which is based on previously published EPRI reports, contains information on the following related to the lightning performance of transmission lines:
The theory of lightning, its statistical parameters, and its impact on transmission lines.
Guidelines for improving the lightning performance of transmission lines.
Fundamentals of transmission line grounding.
Practical and design aspects of transmission line grounding.
Theory and practice of installing transmission line surge arresters to prevent lightning outages.
Application guidelines for EPRI's TFlash lightning software. In this part, readers are guided to compare design options for new lines and mitigation measures for existing lines using TFlash.

Application, Value and Use
This report provides reference information and resources that utilities can use to help improve the lightning performance of their transmission lines and reduce the direct and indirect costs associated with such outages. This reference book is specifically intended for the following
Design engineers performing lightning performance studies on existing and new transmission lines
Asset managers and other maintenance stakeholders determining if lightning is the cause of line outages and identifying appropriate mitigation measures

Newer Version Of
1021190 - Transmission Line Lightning and Grounding Reference Book 2010

Program
2011 Program 35 Overhead Transmission

keywords
Overhead Transmission
TFlash
Lightning performance
EGGS
Transmission line grounding


See More: EPRI - Overhead Transmission Line Lightning and Grounding Reference Book 2011