| 摘要 |
PURPOSE: To provide a partial conductive-glazed insulator capable of sufficiently preventing the occurrence of a corona discharge or RIV under severe operating conditions. CONSTITUTION: A pin metal 21 and a cap metal 22 are connected to a insulator main body 11 made of glazed porcelain serving as an insulation section via Portland cement 18. Conductive glaze layers 19, 20 are formed in the boundary region between the insulating glaze layer 15 of the insulator main body 11 and the Portland cement 18. The conductive glaze layers 19, 20 are made gradually thinner toward a shade section 12 side. The surface resistance of the conductive-glaze layers 19, 20 is within the range of 100-800MΩon the pin side 19 and to the range of 20-1000MΩon the cap side 20.
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