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

December 9, 2017 • ARTICLE ARCHIVE, BushingsComments Off on Experience in Mexico with Non-Ceramic Bushings in Contaminated & Seismic Areas

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 on Mexican HV lines. However, because of lack of sufficient local operating experience, the...

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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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RIS Bushing Technology: Reliability Testing & Field Experience

November 5, 2017 • ARTICLE ARCHIVE, Bushings

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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Transformer Bushing Reliability

October 2, 2017 • ARTICLE ARCHIVE, Bushings

A high voltage bushing is one of the most critical components in a power transformer. Indeed, failure statistics for power transformers show that bushings are one of the three main contributors to failures, which can have catastrophic impact on reliability as...

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Proactive Bushing Fleet Management

August 19, 2017 • ARTICLE ARCHIVE, Bushings

Bushings are highly reliable components. However, if failed, the typical result is extended downtime of a power transformer with not only heavy financial losses but also challenges imposed on the system operator to compensate for the lost unit. Since the...

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Optimizing Safety of HV & UHV Bushings

August 5, 2017 • ARTICLE ARCHIVE, Bushings

Safety is an important factor in the power industry due to the consequences and risks of injury from catastrophic failures of electrical equipment. This aspect must therefore always be taken into account during design – even at the inception of product...

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Diagnostic Measurement & Monitoring of HV Bushings

June 3, 2017 • ARTICLE ARCHIVE, Bushings

Measurement of capacitance and dielectric dissipation factor (power factor) is a proven diagnostic to assess the condition of high voltage bushings. In the past, dielectric response measurements in the frequency domain with frequency domain spectroscopy (FDS)...

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