| 摘要 |
<p>PURPOSE: To make the electric field generated at the end section of an foreign matter in the container of a gas-insulated bus provided with the container, which incorporates a conductor across which a high voltage is applied, is filled with an insulating gas, and is grounded, formed by the foreign matter together with the mirror image of the foreign matter on the surface of the wall of the container weaker than a dielectric breakdown electric field by forming a nonconductive substance on the internal surface of the container. CONSTITUTION: A gas-insulated bus is constituted of a high-voltage conductor 41, tank wall 43, insulator 42, spacer 44, etc. The thickness of the insulator is set at about 1mm as an intermediate value between 0.2mm and 10mm. When a high voltage is applied across the conductor 41, the voltage acts on the wall 43 and insulator 42, in the case a foreign matter exists in the bus when the voltage is applied, electric charges are distributed on the foreign matter and, when the electric field at the end section of the foreign matter exceeds the corona discharge starting voltage, the electric charges are discharged. When the thickness of the insulator 42 is set at about 1mm, the concentration of electric fields to the end of a metallic foreign matter due to a mirror image on the surface of the wall 43 is suppressed and the charge amount of the foreign matter becomes smaller. As a result, the foreign matter hardly float up and the electric field at the end section of the foreign matter becomes about 1/5 the dielectric breakdown electric field. Therefore, the gas insulated bus can be reduced in size.</p> |
