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 it was mostly empty. Otherwise, the event might have proven much more than a repair job for...
In spite of years spent developing sophisticated laboratory tests to reproduce the stresses faced by network components in service, many power engineers still believe that experience at an outdoor test station offers the definitive measure of expected field... Read More
The transmission and distribution sector is facing the constant challenge of delivering reliable as well as affordable electrical power. Hence it is always looking for ways to improve on both. Standards-based certification of equipment has traditionally been... Read More
Mexico’s power system operator, the Comisión Federal de Electricidad (CFE) relies on more than 470 substations with a total of circa 2700 power transformers from 115 kV to 400 kV. Most of these are equipped with oil impregnated paper bushings (OIP) while... Read More
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... Read More
Following the catastrophic failure at a generating station of a T3 bus-tie cable pothead installed in an oilfilled steel tank operating at 13.8 kV, the Transmission Engineering Department at BC Hydro was asked to investigate the cause and develop a repair... Read More
CIGRE Brochure 438 (2010) reviews systems to predict and monitor ice accretion on power networks and also discusses the different anti-icing and deicing methods currently available. These countermeasures are divided into both ‘active’ methods (such as... Read More
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... Read More