Before installation on overhead lines, quality of polymeric insulators must be approved through full design and type testing. Subsequently, manufacturers are responsible for performing sample and routine tests. Moreover, in many cases, users also demand special acceptance tests.
Insulators are widely used in overhead transmission lines to provide mechanical support and electrical protection, as well as in distribution lines and substations.
Application of silicone composite insulators has increased significantly over the past 30 years. One of the key factors behind continued growth will be the confidence shown in them by power utilities.