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Insulators

Repairing RTV Coated Insulators & Composite-Housed Bushings

February 17, 2018 • ARTICLE ARCHIVE, Bushings, InsulatorsComments (0)

Silicone rubber has been applied for decades as an insulation material for high voltage equipment because of its lower weight and lasting hydrophobicity. However, silicone’s resistance to weathering is weaker than that of traditional ceramic insulating materials such as porcelain and glass. While a ceramic insulator is expected to have a lifespan of at...

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Selecting Insulation for Overhead Lines & Substations in Russia

February 17, 2018 • ARTICLE ARCHIVE, Insulators

The Federal Grid Company of the Unified Energy System (FGC UES) operates the electrical transmission grid in Russia and is among the world’s largest companies transmitting power by overhead lines from 220 kV to 750 kV. It is also ranked near the top in...

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Biological Growths on Composite Insulators

February 3, 2018 • ARTICLE ARCHIVE, Insulators

Composite insulators have become common on overhead lines as well as at substations due to application advantages and their attractive acquisition costs. However, the nature of polymeric housing materials is that premature ageing can be a problem if...

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Insulator Design for High Altitude Lines

February 3, 2018 • ARTICLE ARCHIVE, Insulators

Transmission lines the world over often have to traverse mountain ranges or plateaus situated at least 1000 m above sea level. In China, for example, it is estimated that some 60% of the country lies at this altitude or higher. In such cases, design of...

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A Look to the Future of Composite Insulator Technology

January 27, 2018 • ARTICLE ARCHIVE, Insulators

Since the first INMR WORLD CONGRESS held in 1995, by far the most significant development in the field of electrical insulators has been the rapid acceptance of composite insulator technology. Over less than two decades – not that long in the world of power...

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Shielding Electrodes for AC & DC Line Insulators

January 22, 2018 • Insulators

Shielding electrodes of different form are usually foreseen and specified for AC lines with 3 main purposes: to eliminate corona from insulator fittings (i.e. a corona shielding function); to grade the voltage potential along the string in order to limit the...

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Safety Considerations Favor Hollow Core Composite Insulators

January 22, 2018 • ARTICLE ARCHIVE, Hollow Core, Insulators

The selection of hollow composite insulators to replace porcelain on HV equipment such as bushings, surge arresters, breakers (both live & dead tank) and instrument transformers is increasing worldwide. Indeed, for certain applications where reduced...

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Principles for Selection of DC Insulation

January 20, 2018 • ARTICLE ARCHIVE, Insulators

Since the dawn of transmission it became clear that pollution performance of insulators could have great impact on system reliability. Insulators installed close to pollution sources soon become covered by a potentially conductive surface layer that, when...

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