The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 10, 1986
Filed:
Nov. 08, 1984
Minoru Kimura, Takarazuka, JP;
Michitada Endo, Suita, JP;
Abstract
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 V.sub.g /V.sub.1 of the gas phase volume V.sub.g and the liquid phase volume V.sub.1 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.degree. C. and 160.degree. C. and a mean molecular weight of between 180 and 700.