HV/HP Testing
Dielectric Testing of 400 kV Polymeric 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 Round Robin Test (RRT) on a 400 kV double suspension polymeric insulator set according to standard...
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Design & Testing Station Insulators from Icing Point of View
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... Read More
Performance & Ageing of Semi-Conducting Glaze Porcelain 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... Read More
Designing, Testing, Building & Maintaining Compact Towers with Insulated Cross-arms
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:... Read More
Expanding Test Criteria to Ensure Quality of Glass Insulators
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... Read More
Performance of MV Epoxy Insulated Outdoor Equipment
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... Read More
Using Corona Cameras to Inspect Composite Insulators
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... Read More
South African Utility Tested Insulator Performance
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... Read More
