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Arresters

HiPot Field Testing of Surge Arresters

April 21, 2018 • Arresters, ARTICLE ARCHIVE, TestingComments (0)

This article, contributed by arrester specialist, Jonathan Woodworth, explains the basics of using an AC or DC Hipot (dielectric tester) to assess the condition of non-gapped MOV type surge arresters in the field. The method is simple and does not require sophisticated test equipment, yet allows users to effectively determine if an arrester is safe ...

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Arresters Improve Transmission Line Performance in Malaysia

April 21, 2018 • Arresters, ARTICLE ARCHIVE

In recent years, overhead line performance analysis was done in line with series of research for improving the line performance against unscheduled outages. The most common outage was reported due to lightning strikes affecting distribution and transmission...

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Thermal Imaging of Arresters

April 20, 2018 • Arresters, ARTICLE ARCHIVE, Woodworth on Arresters

It is a challenge to accurately describe what arresters will be like 35 years from now. But some things can be predicted with near certainty. One is that they will be smart arresters. In fact, the smart arrester is just around the corner and its ‘brain’...

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Experience with Application of TLAs on 400 kV Line

March 31, 2018 • Arresters, ARTICLE ARCHIVE

Lightning has been reported as the main cause of unscheduled outages on overhead sub-transmission and transmission lines (e.g. U.S.: 57%; Brazil: 50-70%; Japan: 70-80%; Denmark: 57%; Colombia: 47-69%). Reducing outages due to lightning has a major impact on...

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Interaction of Vibration Dampers with Surge Arresters

March 24, 2018 • Arresters, ARTICLE ARCHIVE

Most transmission line surge arresters (TLSA) have been installed somewhere between the clamps and the Aeolian vibration dampers, without consideration of the fact that line tensions are higher than on distribution lines. Undesired interactions can then...

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Switching Surge Voltage Reduction with Line Arresters Helped Overcome Critical Clearances on 500 kV Lines

March 3, 2018 • Arresters, ARTICLE ARCHIVE

This contribution by Rao Thallam, Jim Hunt and Albert J. Keri of Arizona-based utility, Salt River Project, is based on a paper delivered by Mr. Hunt at the 2013 INMR WORLD CONGRESS in Vancouver. Switching Surge Factor is defined as the ratio of a power...

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When to Remove an Arrester from Service

February 23, 2018 • Arresters, ARTICLE ARCHIVE

Functionality versus Age Deciding on the ‘end of life’ of an arrester in a power system can prove highly subjective because this component can survive for a long time without obvious loss of functionality. Of course, in those cases where a dramatic...

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Application of Station Class Arresters on Underbuilt Distribution Lines

February 17, 2018 • Arresters, ARTICLE ARCHIVE

Current protection systems for distribution networks are typically designed to handle fast-impulse overvoltages, such as from switching and lightning, but not power frequency overvoltages that are relatively long duration. For example, should contact occur...

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