Woodworth on Arresters

Understanding Energy Rating of Distribution Arresters

December 1, 2018 • Arresters, ARTICLE ARCHIVE, Editorial Columns, Woodworth on ArrestersComments Off on Understanding Energy Rating of Distribution Arresters

“What is the kJ/kV Uc rating of a Class 1, 10 kA arrester? This type of question has often been asked when it comes to distribution arresters. Yet finding an answer was never easy since these arresters (formerly referred to as Class 1) never had energy ratings. Fortunately, with the latest revision to IEC Arrester ...

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Fault Current Withstand Capability of Station Class Arresters

August 18, 2018 • ARTICLE ARCHIVE, Woodworth on Arresters

Station class arresters since 1980 have been based around various types of metal oxide varistors. Despite having been designed to withstand most power system surges, it is still possible for these varistors to become overloaded or fail such that fault current... Read More

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’... Read More

Lightning Performance of Distribution Lines

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

The most recent edition of IEEE Technical Guide 1410 on how to improve lightning performance of distribution lines was issued in 2010 when many improvements were added. Because the experts involved had deep roots in the world of lightning and system transient... Read More

Helping Understand the VI Characteristic Curve

January 13, 2018 • ARTICLE ARCHIVE, Editorial Columns, Woodworth on Arresters

The voltage-current (VI) characteristic of its varistor is without doubt one of the most important parameters of any surge arrester. Still, most arrester users do not see this characteristic represented in graphical form but rather only as tables of discharge... Read More

Transmission Line Arresters Lower Losses & Increase Reliability

January 2, 2018 • Article of the week, Utility Practice & Experience, Woodworth on Arresters

Given the possible application of line arresters to mitigate the effects of lightning, it strikes me as inexplicable that arresters are not being used more often to reduce momentary lightninginduced outages on transmission lines. I have asked experts to... Read More

What’s Next After Succession of Different Arrester ‘Eras’?

November 25, 2017 • Arresters, ARTICLE ARCHIVE, Woodworth on Arresters

Like many other things, the surge arrester was born of necessity. But while most might guess that arresters were introduced around the late 1800s when power lines first entered operation, they actually appeared 50 years earlier. Their initial function, in... Read More

Improving TOV Testing

August 26, 2017 • ARTICLE ARCHIVE, Testing, Woodworth on Arresters

Members of my taskforce in IEC TC37 MT4 are working to rationalize type tests within IEC 60099-4. In the process, we have been looking at a test that has been basic for all IEC type arresters since the 1991 edition, namely the Temporary Overvoltage Test (TOV)... Read More

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