Composite Insulators for Overhead Lines: Field Experience and Laboratory Research

摘要

In England, France and Italy, recent investigations have been made on composite insulators of many different types. The findings relate to experience on operational lines, tests in outdoor stations and research in the laboratory. Such tests were mainly aimed at determining both the long-term characteristics and the service-life expectancy. The differences in the investigations of the three national utilities, as well as their principal common results and conclusions, are presented. Over the last few years, improvements have occurred in the design and construction of composite insulators. However, some mechanism of failure and degradation are still not well understood. (ERA citation 14:004435)