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Quantification of Hydrophobic Properties

April 21, 2018 • ARTICLE ARCHIVE, Editorial Columns, Reporting from CIGRE Comments (0)

Hydrophobicity is perhaps the single most recognized property of polymeric materials used for outdoor insulation since it provides added value in terms of enhancing pollution performance. However, only the family of silicone rubber polymers has demonstrated over years of field experience that hydrophobicity can endure over the full service life expected of an insulator. Since ...

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Learning from Service Experience with Composite Line Insulators

April 21, 2018 • ARTICLE ARCHIVE, Insulators Comments (0)

Over the past 10 years, utilities have begun to experience an increasing number of failures of polymeric insulator on 115 and 138 kV transmission lines. Investigation has shown that these failures could often be attributed to high electric field (E-field)...

Lightning Protection for HVDC Lines

April 14, 2018 • Transient Thoughts Comments (0)

The design of AC overhead lines requires considering many factors, including wind and ice loads, strength of poles and insulator attachment hardware, line voltage and transient overvoltage stresses as well as insulator pollution exposure. It is therefore...

Failure Triggered Insulator Replacement & Inspection Program at Chinese Power Utility

April 14, 2018 • ARTICLE ARCHIVE, Camera, Inspection, Utility Practice & Experience Comments (0)

A past issue of INMR featured the findings of a university research project into the mechanical failure of a 500 kV composite insulator in a relatively clean environment in central China. The finding here was that the failure, which did not show the...

HiPot Field Testing of Surge Arresters

April 21, 2018 • Arresters, ARTICLE ARCHIVE, Testing Comments (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...

Condition Assessment of High Voltage Cable Terminations

April 21, 2018 • ARTICLE ARCHIVE, Cable Accessories Comments Off on Condition Assessment of High Voltage Cable Terminations

Condition assessment of power transmission devices such cable systems is essential for their reliable operation. For example, diagnostics of oil-filled cables is important for transmission system operators to provide an indication of their remaining lifetime....

Thermal Imaging of Arresters

April 20, 2018 • Arresters, ARTICLE ARCHIVE, Woodworth on Arresters Comments (0)

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’...

Technical Review of Hybrid Insulators

April 7, 2018 • ARTICLE ARCHIVE, Insulators Comments (0)

In the past, the main options for support insulators at air-insulated HVAC substations were either solid core porcelain or composite insulators up to 245 kV. In addition, RTV coatings have at times been applied to solid core porcelain post insulators to...

Pre-Coating RTV Silicone onto Glass Disc Insulators

Pre-Coating RTV Silicone onto Glass Disc Insulators

April 14, 2018 • ARTICLE ARCHIVE, Glass, Silicone & Other Materials, Utility Practice & Experience Comments (0)

Until recently, most applications of RTV silicone material have been as a remedial measure to mitigate pollution-related flashovers of insulators suffering poor service performance. Indeed, coatings have been viewed for years mainly as a maintenance product...

Protective Devices Installed to Reduce Wildlife Outages at Distribution Substation

April 7, 2018 • ARTICLE ARCHIVE, Maintenance, Wildlife Protection Comments (0)

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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