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EP0159440A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Evaporation-cooled gas insulated electrical apparatus

Assignee: Mitsubishi Electric Corp
•
Filing: 1984-11-12
•
Granted: —
•
Expires: 2004-11-12
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Abstract

Abstract An evaporation-cooled gas-insulated electrical apparatus comprises a housing 10, a transformer or other heat- generating electrical device 12, a condensable refrigerant convertible between liquid 16 and vapor 18 phases, and a noncondensable, electrically insulating gas 14. The condensable refrigerant and the noncondensable gas are selected so that the ratio V g /V l of the gas phase volume V g and the liquid phase volume V, is between 1 and 10, and so that the specific weight of the noncondensable gas is smaller than the specific weight of the vapour of the condensable refrigerant during operation, so that the noncondensable gas and the condensable refirgerant vapour 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 in the condensable refrigerant, e.g. SF 6 or C 2 F 6 , compared to that of the other mixed gas, e.g. N 2 , and the condensable refrigerant is a fluorocarbon liquid having a boiling point between 80 and 160°C and a mean molecular weight of between 180 and 700.

Inventors

  • 👤 Michitada Endo
  • 👤 Minoru Kimura

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-06 19:48
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/08; H01F27/10; H01F27/18

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 184 words
An evaporation-cooled gas-insulated electrical apparatus comprising, in a housing (10): an electrical device (12) generating heat when in operation; a condensable fluorocarbon refrigerant (16, 18) convertible between liquid and vapour phases; and a noncondensable, electrically insulating gas (14); said condensable refrigerant and said noncondensable gas being selected so that the ratio V g /V l of the gas phase volume Vg and the liquid phase volume V is between 1 and 10, and so that the specific weight of the noncondensable gas is smaller than the specific weight of the vapour of the condensable refrigerant during operation, and so that said noncondensable gas and said condensable refrigerant vapour are separated due to the difference in their specific weights; characterised in that the noncondensable gas (14) is a mixture of two noncondensable gases, one of the mixed gases having a very small solubility in the condensable regrigerant (16, 18) as compared to that of the other mixed gas; and the condensable regrigerant is a fluorocarbon liquid (16) having a boiling point between 80°C and 160°C and a mean molecular weight of between 180 and 700.
Claim 2
Dependent Claim 184 words
An evaporation-cooled gas-insulated electrical apparatus comprising, in a housing (10): an electrical device (12) generating heat when in operation; a condensable fluorocarbon refrigerant (16, 18) convertible between liquid and vapour phases; and a noncondensable, electrically insulating gas (14); said condensable refrigerant and said noncondensable gas being selected so that the ratio V g /V l of the gas phase volume Vg and the liquid phase volume V is between 1 and 10, and so that the specific weight of the noncondensable gas is smaller than the specific weight of the vapour of the condensable refrigerant during operation, and so that said noncondensable gas and said condensable refrigerant vapour are separated due to the difference in their specific weights; characterised in that the noncondensable gas (14) is a mixture of two noncondensable gases, one of the mixed gases having a very small solubility in the condensable regrigerant (16, 18) as compared to that of the other mixed gas; and the condensable regrigerant is a fluorocarbon liquid (16) having a boiling point between 80°C and 160°C and a mean molecular weight of between 180 and 700.
Claim 3
Dependent Claim 53 words
An evaporation-cooled gas-insulated electrical apparatus as claimed in claim 1, wherein one of the gases mixed to form said noncondensable gas is SF gas, characterised in that the noncondensable gas mixture consists of 5 to 20% by volume of SF 6 gas and 95 to 80% by volume of the other noncondensable gas.
Claim 4
Dependent Claim 56 words
An evaporation-cooled gas-insulated electrical apparatus as claimed in claim 1, characterised in that the noncondesable gas of small solubility is hexafluoroethane (C 2 F 6 ) gas, and said noncondensable gas mixture consists of 10 to 40% by volume of C 2 F 6 gas and 90 to 60% by volume of said other noncondensable gas.
Claim 5
Dependent Claim 25 words
An evaporation-cooled gas-insulated electrical apparatus as claimed in claim 1, 2 or 3 characterised in that the said other noncondensable gas is N 2 gas.

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