| 摘要 |
PURPOSE:To prevent the deterioration in dielectric strength of the titled electric apparatus by a method wherein a refrigerant circulating means, with which the refrigerant is taken out to a refrigerant recovering container when the refrigerant contained in a case is heated up to the prescribed temperature or above and the refrigerant is returned to the case when its temperature goes down lower than the prescribed temperature, and a heat accumulating body to be formed in said refrigerant recovering container are provided. CONSTITUTION:The temperature of a refrigerant 3 is maintained at T deg.C or above by having the refrigerant to come in contact with heat accumulating bodies 7 while an electric apparatus main body 2 is being operated normally, and after the operation of the electric apparatus main body 2 has been stopped, the temperature of the refrigerant 3 is maintained at T deg.C for a little while, and the insulation of a gas insulated electric apparatus is maintained by an insulating medium 4 using the insulating gas such as SF6 gas and the like. Then, when the temperature of the electric apparatus main body rises again, the refrigerant 3 is fed into a heat exchanger 12 by the operation of a liquid feeding pump 8 through a lower liquid feeding pipe 6 and a refrigerant container 5. When the fact that the temperature of the refrigerant 3 is brought to the T1 deg.C which is lower than the phase transition temperature T deg.C of a heat accumulating bodies 7 is detected, a refrigerant circulating means 16 starts operation, and the refrigerant 3 in the case 1 is recovered into a refrigerant recovering container 15 through the refrigerant container 5.
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