Learning from Service Experience with Composite Line Insulators

April 21, 2018 • ARTICLE ARCHIVE, InsulatorsComments (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) occurring near or on the high-voltage end fittings. Such findings suggest that, contrary to common ...

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Coating Insulators to Prevent Pollution Flashover in Kuwait

April 21, 2018 • ARTICLE ARCHIVE, Insulators

The Gulf State of Kuwait is nestled in one of the driest places on earth. A highly urbanized country, it is also one of the highest per capita consumers of energy, mostly in the oil and gas sector as well as for air conditioning and water desalination plants....

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Innovations & Challenges in Insulator Design for UHV

April 7, 2018 • ARTICLE ARCHIVE, Insulators, Utility Practice & Experience

Among the challenges when it comes to insulator design for UHV applications is to fulfil required lengths while also mitigating resulting negative effects on insulation and mechanical performance. Efforts can be made in system design to reduce levels of...

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Combined Load Limitations of Composite Line Posts

April 7, 2018 • ARTICLE ARCHIVE, Insulators

High voltage line post insulators have long been used to support and insulate overhead lines. First introduced at the distribution voltage level, their use extended to transmission lines to realize the potential to reduce cost of new lines by lowering...

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Pollution Performance of Composite Hollow Core Insulators

April 7, 2018 • ARTICLE ARCHIVE, Hollow Core, Insulators

Composite insulator housings have now become a standard solution implemented on power grids worldwide and are the preferred choice for application in heavily polluted service environments. To ensure performance under such conditions, a variety of design tests...

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Materials Toward Development of Insulators of the Future

April 7, 2018 • ARTICLE ARCHIVE, Insulators

A common industry goal these days is that a growing proportion of energy supply will come from renewable energy sources such as hydro power, wind energy, solar energy as well as tidal and wave energy. At the same time, the power systems will have to become...

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Technical Review of Hybrid Insulators

April 7, 2018 • ARTICLE ARCHIVE, Insulators

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...

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Non-Soluble Surface Deposits on Insulators

March 31, 2018 • ARTICLE ARCHIVE, Insulators

High voltage engineers well understand that insulators usually remain quiescent when dry – even if highly polluted. However, they can quickly light up with partial discharge activity once dirty surfaces are wetted by rain or condensation. The extent of such...

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