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Bushings

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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Transformer Bushing Reliability Survey & Risk Mitigation Measures (Part 2 of 2)

February 17, 2018 • ARTICLE ARCHIVE, Bushings

Statistics show that bushings are one of the main contributors to transformer failure. Their failure therefore has huge impact on reliability as well as safety of the system and operators managing the asset. With this in mind, major utilities in southeast...

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Transformer Bushing Reliability Survey & Risk Mitigation Measures

February 10, 2018 • ARTICLE ARCHIVE, Bushings

Statistics show that bushings are one of the main contributors to transformer failure. Their failure therefore has huge impact on reliability as well as safety of the system and operators managing the asset. With this in mind, major utilities in southeast...

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RIS Bushing Technology: Reliability Testing & Field Experience

January 27, 2018 • ARTICLE ARCHIVE, Bushings, Testing

Problems with bushings are one of the leading causes of transformer failure and that means their proper selection can significantly impact transformer and substation safety. Traditional bushing technologies such as oil-impregnated paper bushings (OIP) and...

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Composite Bushings with RTV Coatings Combat Pollution at Substation in Israel

December 22, 2017 • ARTICLE ARCHIVE, Bushings, Utility Practice & Experience

The power system in Israel operates in a sub-tropical as well as desert environment. A long dry season lasts some eight months during which all types of contaminants – from marine to dust to industrial and agricultural – accumulate on insulators. This...

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Experience in Mexico with Non-Ceramic Bushings in Contaminated & Seismic Areas

December 9, 2017 • ARTICLE ARCHIVE, Bushings

The first application of composite insulators in Mexico began in the mid 1990s with initial use limited to transmission lines in areas with pollution problems. A growing body of service experience eventually resulted in a national standard for such insulators...

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Using Dielectric Frequency Response to Assess Bushing & Instrument Transformer Insulation

November 25, 2017 • ARTICLE ARCHIVE, Bushings

Modern technology in signal acquisition and analysis techniques has provided new tools for transformer diagnostics. Of particular interest are dielectric response measurements where insulation properties of oil/paper systems can be investigated. Dielectric...

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Overview of Test Requirements & Case Histories for HV Bushings

Overview of Test Requirements & Case Histories for HV Bushings

November 18, 2017 • ARTICLE ARCHIVE, Bushings

Bushings are key components of HV substation equipment such as transformers and switchgear, allowing conductors to transfer energy from one insulating medium to another. Most typically, this will be from an oil or SF6 insulation environment to air. Bushings...

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