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HV/HP Testing

Designing, Testing, Building & Maintaining Compact Towers with Insulated Cross-arms

August 12, 2017 • ARTICLE ARCHIVE, HV/HP Testing, InsulatorsComments (1)

A search for new tower designs was launched in Belgium in early 2008 in conjunction with two new 400 kV projects: Stevin (extension of the 400 kV grid to the coast) and Brabo (reinforcement of the 400 kV grid in the Port of Antwerp). Requirements were: • minimal visual effects on landscape • low EMF and noise ...

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Expanding Test Criteria to Ensure Quality of Glass Insulators

July 29, 2017 • ARTICLE ARCHIVE, glass, HV/HP Testing

Toughened glass has been increasing its share of the total insulator business through growing application of glass strings on overhead lines. At the same time, there has been increased ‘turbulence’ in this market sector. Competition has intensified with...

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Performance & Ageing of Semi-Conducting Glaze Porcelain Insulators

Performance & Ageing of Semi-Conducting Glaze Porcelain Insulators

July 1, 2017 • ARTICLE ARCHIVE, HV/HP Testing, Insulators

Although porcelain insulators have been used widely at all voltage levels for many years now, they have not performed entirely without problems. These typically tend to occur when pollution and moisture combine to form a highly-conductive layer on their...

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Experience in Mexico Evaluating HV Bushings Retired from Service

Evaluating HV Bushings Retired from Service in Mexico

June 24, 2017 • ARTICLE ARCHIVE, HV/HP Testing

Mexico’s power system operator, the Comisión Federal de Electricidad (CFE) relies on more than 470 substations with circa 2700 power transformers from 115 kV to 400 kV. Most are equipped with oil impregnated paper bushings (OIP) while there is lesser use...

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Predicting Performance of MV Epoxy Insulated Outdoor Equipment

Performance of MV Epoxy Insulated Outdoor Equipment

May 13, 2017 • ARTICLE ARCHIVE, HV/HP Testing

Because of its rigidity, the epoxy family of polymeric materials occupies a unique position in the field of outdoor insulation. For example, this property means that it cannot be classified as elastomeric, as are both silicone and EPDM rubbers. Also, epoxies...

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Testing the Ageing of Porcelain Insulators

May 6, 2017 • ARTICLE ARCHIVE, HV/HP Testing

Normally, the concept of ageing of insulators is something associated mainly with composite types. However, this does not suggest that other types of insulators do not also age. This article, reported by Dr. Ravi Gorur, presented results of a past test...

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Using Corona Cameras to Inspect Composite Insulators

May 6, 2017 • ARTICLE ARCHIVE, camera, cameras, Corona, HV/HP Testing

The development of UV cameras that permit corona detection even during daytime is quite a positive development for electric utilities. This is because these cameras offer yet another practical tool for routine inspection of lines and equipment. At the same...

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South African Utility Tested Insulator Performance

April 29, 2017 • ARTICLE ARCHIVE, HV/HP Testing, Insulators

If one looks back some 30 years or so, large national power companies such as EDF in France, CEGB in the UK or ENEL in Italy were important participants in the development process for electrical insulators. In co-operation with local manufacturers, these...

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