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Article of the week

Testing for Safety & Risks Affecting Operation of HV Cable Terminations, Bushings & Arresters

January 6, 2018 • ARTICLE ARCHIVE, Article of the week, HV/HP Testing, testingComments (0)

Not long ago, a HV cable termination operating in a Mediterranean country experienced catastrophic failure, sending high velocity porcelain shards in all directions. The installation happened to be next to a parking lot but fortunately this occurred on a day when it was mostly empty. Otherwise, the event might have proven much more than a ...

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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...

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Reducing Ice Accretion Using ‘Super-Hydrophobic’ Coatings on Conductors & Insulators

December 22, 2017 • ARTICLE ARCHIVE, Article of the week, HV/HP Testing

CIGRE Brochure 438 (2010) reviews systems to predict and monitor ice accretion on power networks and also discusses the different anti-icing and deicing methods currently available. These countermeasures are divided into both ‘active’ methods (such as...

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Protective Devices Installed to Reduce Wildlife Outages at Distribution Substation

December 2, 2017 • ARTICLE ARCHIVE, Article of the week, Maintenance, Wildlife Protection

Among the most vulnerable links in any power network are the points of interaction between live equipment and wildlife – from birds to scavenging carnivores. Taken together, these creatures present a constant threat to the safe operation of network assets....

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A Review of Insulator Failure Modes

November 11, 2017 • ARTICLE ARCHIVE, Article of the week, Insulators

There are three proven insulator technologies being deployed in delivery of electrical power throughout the world. Porcelain and glass insulators have been used since the start and have had a very good record of performance and reliability. In fact, the...

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Forensic Analysis of Failed Surge Arresters

Forensic Analysis of Failed Surge Arresters

July 8, 2017 • Arresters, ARTICLE ARCHIVE, Article of the week

Arresters are essentially devices to divert lightning and switching surges and can sometimes become overloaded to the point of failure. Whenever this occurs, it’s extremely useful to properly determine the reason why the arrester (or companion arresters)...

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Research Provides Insight into Unexplained Line Outages

Research Provided Insight into Unexplained Line Outages

June 24, 2017 • ARTICLE ARCHIVE, Article of the week, Insulators

Pollution flashovers of insulator strings have historically been one of the main causes of line outages under normal operating conditions. Indeed, years ago this was a relatively common occurrence across many countries suffering from heavy industrial...

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Principal Failure Modes for Surge Arresters

Principal Failure Modes for Surge Arresters

May 27, 2017 • Arresters, ARTICLE ARCHIVE, Article of the week

The failure of an arrester almost always results in a complete short circuit inside its housing. In most scenarios, failure occurs due to dielectric breakdown, whereby the internal structure has deteriorated to the point where the arrester is unable to...

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