| 摘要 |
<p>PURPOSE:To facilitate manufacture of a gas insulation switchgear and contract an external shape by setting a non-equality coefficient of an electric field, between mutual conductors connected to electric equipment in an insulation gas sealed vessel or between the conductor and a ground potential, to a specific range. CONSTITUTION:Electric equipment is stored in a sealed vessel sealed with insulation gas, and an insulation bushing having a conductor, connected to this electric equipment, is provided and connected to a cable in the outside of the vessel. In this gas insulated switchgear, as the insulation bushing, a cone-shaped insulation layer 31 is formed in the periphery of a center conductor 30 by injecting an epoxy resin, to provide a ground layer 32 by conductive paint in the periphery of the insulation layer. Here is set a non-uniform coefficient of an electric field, between the conductor 30 and ground potential of the ground layer 32, to 3 to 11 range. Consequently, it is preferable to set the cone-shaped slope to 45 deg. and further ratio of its height H to external diameter D to 0.4 or less. In this way, the insulation bushing, increasing a withstand voltage value, facilitating work and contracting an external shape, can be obtained.</p> |
