Abstract
Semiconducting glazed i~sulators have advantages
of unifonn voltage distribution on surface and
of keeping the surface dry, \Vhich greatly improves
contamination withstand voltage.
Laboratory tests simulating desert contamination
conditions were performed. Test results showed that
the semiconducting glazed insulators had the
withstand vqltagc about 3 times as high as that of
ordinary glazed normal type insulators. The semiconducting
glazed insulators are found to have better
contamination withstand voltage than silicone rnbber
insulators. In addition, they showed no corona
discharges even at heavy contamination conditions.
As a result. the semiconducting glazed insulators
can realize high reliability transmission lines in heavy
contamination areas at lower cost due to possible
compact design and/or less maintenance cost.
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