Abstract

Semiconducting glazed insulators were developed some time ago. But they have been used in limited areas since longtenn performance was not certain. After field evaluation for a long time and studies for improving design and material, high reliabilitY semiconducting glazed insulators are now available. Their improved design was determined by taJcing account for optimum impedance of the insulator, good metal-to-glaze joint, etc. Good performance was verified by field and laboratory test results. Contamination withstand voltage was almost 3 times higher than that of ordinary glazed insulators. In addition, the semiconducting glazed insulators could reduce corona discharge under contaminated conditions very much. Therefore, they can be applied for actual transmission lines and substations and can make it possible to build compact lines and to reduce maintenance cost.

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