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Article of the week

Reviewing Modes of Insulator Failure

October 12, 2018 • ARTICLE ARCHIVE, Article of the week, InsulatorsComments (0)

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 success and rapid expansion of overhead networks could never have been possible were it not ...

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Insulator Corrosion Affected HVDC Lines in China

June 9, 2018 • ARTICLE ARCHIVE, Article of the week, Utility Practice & Experience

In March 2011, problems of electrolytic corrosion on the caps of ceramic cap & pin insulator strings began appearing on the world’s first ±800 kV HVDC line, located in southern China. This line – known as Chu-Sui – runs across 1200 km of mostly... Read More

Modular HVDC System Interconnects Countries of Arabian Gulf

March 17, 2018 • ARTICLE ARCHIVE, Article of the week, Utility Practice & Experience

American inventor and ardent DC advocate, Thomas Edison, seems destined to have the last laugh. Progress in power electronics and insulation design over recent years have finally helped DC achieve major gains against AC systems which, despite Edison’s... Read More

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

January 6, 2018 • ARTICLE ARCHIVE, Article of the week, HV/HP Testing, Testing

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... 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

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... Read More

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... Read More

Norwegian Utility Re-Dimensioned Insulation in Voltage Upgrade Project

Norwegian Utility Re-Dimensioned Insulation in Voltage Upgrade Project

April 27, 2017 • ARTICLE ARCHIVE, Article of the week, Corona, Insulators, Utility Practice & Experience

Norwegian power utility, Statnett, operates a network of over 10,000 km of overhead lines from 132 to 420 kV. Recent changes in power flow made it necessary to increase capacity so, like many transmission system operators, Statnett is working towards building... Read More

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