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HV/HP Testing

Assessing Performance of Different Conductor & Line Hardware Configurations

December 9, 2017 • ARTICLE ARCHIVE, HV/HP TestingComments Off on Assessing Performance of Different Conductor & Line Hardware Configurations

There are only a few installations worldwide whose purpose is to assess performance of different designs of line hardware and conductors under stresses caused by environmental factors such as wind and icing. One of these, operated by Hydro-Québec, is located in a flat agricultural region south of Montreal. INMR visits this installation and also the ...

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Safety Testing of HV Cable Terminations, Bushings & Arresters

November 11, 2017 • ARTICLE ARCHIVE, Article of the week, HV/HP Testing

Several years ago, a HV cable termination operating in a Mediterranean country experienced catastrophic failure, scattering high velocity porcelain shards in all directions. The installation was next to a parking lot but fortunately the failure occurred when...

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Dielectric Testing of 400 kV Polymeric Insulators

October 7, 2017 • ARTICLE ARCHIVE, HV/HP Testing, Insulators

Dielectric type tests of insulator sets have been performed for decades to ensure satisfactory electrical performance when these are installed on distribution and transmission lines. Recently, four fully accredited high voltage test laboratories performed a...

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Design & Testing Station Insulators from Icing Point of View

October 2, 2017 • ARTICLE ARCHIVE, HV/HP Testing, Insulators

Pollution exposure under icing and snow is a highly relevant environmental factor for dielectric reliability of post insulators at air-insulated substations, especially in the case of HVDC. This exposure also affects key equipment that relies on post...

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Performance & Ageing of Semi-Conducting Glaze Porcelain Insulators

Performance & Ageing of Semi-Conducting Glaze Porcelain Insulators

September 2, 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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Designing, Testing, Building & Maintaining Compact Towers with Insulated Cross-arms

August 12, 2017 • ARTICLE ARCHIVE, HV/HP Testing, Insulators

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:...

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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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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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