Insulators and bushings
In the transmission and distribution of electrical energy, insulators have the important task of creating a barrier between live voltage and the ground, while providing strong mechanical support.
Insulators have to withstand electrical, mechanical and even weather ageing stresses. Insulators are used at various locations in a power network and their insulation and mechanical characteristics must ensure a long-lasting barrier. Porcelain and glass-type insulators have been in use for over 100 years. More recently, new composite materials were introduced. Phenomena different from those affecting porcelain or glass insulators are relevant for these new materials.
Accelerated weather aging tests
Insulators are mounted all over the world. This means that the environment in which insulators are used varies. Sometimes weather conditions can be extreme for several decades. In some countries temperatures above 50 °C can be reached. Not only high temperatures may occur, but also high humidity, rain, snow or low temperatures. To determine the stability of the composite materials when exposed to UV and severe weather conditions, special tests are required to determine the basic quality level. Those facilities are available at DNV GL.
DNV GL is very well equipped to perform (type) tests on insulators according to internationally recognized standards such as ANSI or IEC (60383, 61109 etc.). We can be your partner in testing all kinds of insulators.