If one studies the evolution of composite insulator technology since its development starting in the 1970s, one fact quickly becomes clear: the market experience for apparatus insulators has been much different than for line insulators.
For example, composite insulators for overhead lines were initially received with great interest by power supply companies due to their promised advantages of superior pollution performance as well as lightweight combined with high strength. However, this initial enthusiasm soon evaporated once users became aware of the accompanying risk of mechanical failure and dropped conductor – a failure mode labeled brittle fracture that reached its peak during the 1990s.
To some extent, mechanical fracture of the core rod is still being encountered today, especially with older generations of line insulators or with units that have been damaged during handling or produced without proper quality control. Nevertheless, after intensive research, most experts now believe that the cause of this problem is well understood and that modern composite line insulators are designed and manufactured to virtually eliminate such a risk. Composite hollow core insulators, on the other hand, have never suffered from any single documented mode of failure. On the contrary. Service experience has, by and large, confirmed that this technology offers the high performance expected across most applications, assuming of course that the insulators were properly specified for their service environment.
complete story at http://www.inmr.com/2013/11/service-experience-hollow-composite-insulators-hv-apparatus-part-1/
#electrical #insulators #hollow #composite
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