| 摘要 |
An evaporation-cooled gas insulated electrical apparatus comprising, in a housing, an electrical device generating heat when in operation, a condensable refrigerant convertible between liquid and vapor phases, and a noncondensable, electrically insulating gas. The condensable refrigerant and the noncondensable gas are selected so that the ratio Vg/V1 of the gas phase volume Vg and the liquid phase volume V1 is between 1 and 10, and so that the specific weight of the noncondensable gas is smaller than the specific weight of the vapor of the condensable refrigerant during operation, and so that the noncondensable gas and the condensable refrigerant vapor are separated due to the difference in their specific weights. The noncondensable gas is a mixture of two noncondensable gases, one of the mixed gases having a very small solubility into the condensable refrigerant compared to that of the other mixed gas, and the condensable refrigerant is a fluorocarbon liquid having a boiling point between 80 DEG C. and 160 DEG C. and a mean molecular weight of between 180 and 700.
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