| 摘要 |
PURPOSE:To obtain a gas-insulated transformer which is highly reliable in insulation, by gas-dividing and placing a non-linear resistance element for suppressing potential oscillation in a pressure-resistant insulating cylinder, and making the gas pressure of the non-linear resistance element side higher than in the main body of the transformer. CONSTITUTION:A non-linear resistance element 15 to be provided on a high-voltage winding 4 is disposed so as to be received within a pressure-resistant insulating cylinder 16. The pressure-resistant insulating cylinder 16 has one end thereof fixed to the core 1 side and the other end thereof airtightly opened in a tank 8, and this opening is airtightly provided with a cover 17. An insulating gas 18 such as SF6 gas is sealed in the pressure-resistant insulating cylinder 16 with a pressure higher than the insulating gas 19 of the main body side in the tank 8. In a case of penetration of a surge voltage, potential oscillation is suppressed because of the non-linear resistance element 15 being connected. In addition, since the insulating gas 18 is sealed in the pressure- resistant insulating cylinder 16 with a high pressure, the dielectric strength of the surface of the non-linear resistance element 15 becomes high. Moreover, since the non-linear resistance element 15 is gas-divided from the main body side, inspection or repair can readily be performed. |
