EP0121267A1 — Gas-insulated electrical apparatus

Claim 1

Independent Claim 131 words

A gas-insulated electrical apparatus comprising a tank (2; 62) housing an electrical apparatus (1; 61) proper and in which a gas mixture (3; 63) consisting essentially of a noncondensable insulating gas and a condensable refrigerant gas and a liquid phase (4; 64) of the condensable refrigerant gas are sealed, and a gas reservoir (10b; 71) connected to said tank (2; 62) in a gas mixture feeding and receiving relation therewith, characterized by means (24, 25, 27; 29, 30, 31, 32; 33, 34, 35, 36, 38; 75, 76, 77) provided between said tank (2; 62) and the gas reservoir (10b; 71) for selectively supplying said gas mixture (3; 63) from said tank (2; 62) into said gas reservoir (10b; 71) or from said gas reservoir (10b; 71) into said tank (2; 62).

Claim 2

Dependent Claim 131 words

A gas-insulated electrical apparatus comprising a tank (2; 62) housing an electrical apparatus (1; 61) proper and in which a gas mixture (3; 63) consisting essentially of a noncondensable insulating gas and a condensable refrigerant gas and a liquid phase (4; 64) of the condensable refrigerant gas are sealed, and a gas reservoir (10b; 71) connected to said tank (2; 62) in a gas mixture feeding and receiving relation therewith, characterized by means (24, 25, 27; 29, 30, 31, 32; 33, 34, 35, 36, 38; 75, 76, 77) provided between said tank (2; 62) and the gas reservoir (10b; 71) for selectively supplying said gas mixture (3; 63) from said tank (2; 62) into said gas reservoir (10b; 71) or from said gas reservoir (10b; 71) into said tank (2; 62).

Claim 3

Dependent Claim 21 words

The apparatus as claimed in claim 1 characterized in that said means comprises a reservoir compressor (25; 29, 30; 33; 75).

Claim 4

Dependent Claim 36 words

The apparatus as claimed in claim 1 characterized in that said means comprises a first compressor (29) and a second compressor (30) adapted for supplying said gas mixture under pressure in mutually opposite directions (Fig. 4).

Claim 5

Dependent Claim 80 words

The apparatus as claimed in claim 1 characterized in that said means comprises a compressor (33) adapted for supplying said gas mixture (3) only in one direction and associated with a control valve (34) on one side and another control valve (35) on the other side thereof, a third control valve (36) bypassing said one-side control valve (34) and the compressor (33), and a fourth control valve (38) bypassing said other-side control valve (35) and the compressor (33) (Fig. 5).

Claim 6

Dependent Claim 216 words

A gas-insulated electrical apparatus comprising a tank (62) housing an electrical apparatus (61) proper and in which a gas mixture (63) consisting essentially of a noncondensable insulating gas and a condensable refrigerant gas and a liquid phase (64) of the condensable refrigerant gas are sealed, and a gas reservoir (71) connected to said tank (62) in a gas mixture feeding or receiving relation therewith, characterized by means (75, 76, 77) provided between said tank (62) and the gas reservoir (71) for selectively supplying said gas mixture (63) from said tank (62) into said gas reservoir (71) or from said gas reservoir (71) into said tank (62), a pressure sensor (69) for sensing the pressure within said tank (62), a temperature sensor (70) for sensing the temperature of the gas mixture (63) of said insulating gas and said refrigerant gas turned into the gaseous phase through evaporation, and control means (78) for controlling the pressure in said tank (62) to be within a preset pressure range through operation or actuation of said conveying means (75, 76, 77), said control means (78) being so set that pressure control be performed for the temperature of .the gas mixture in said tank (62) which is higher than a preset lower value and lower than a preset higher value (Fig. 6).

Claim 7

Dependent Claim 216 words

A gas-insulated electrical apparatus comprising a tank (62) housing an electrical apparatus (61) proper and in which a gas mixture (63) consisting essentially of a noncondensable insulating gas and a condensable refrigerant gas and a liquid phase (64) of the condensable refrigerant gas are sealed, and a gas reservoir (71) connected to said tank (62) in a gas mixture feeding or receiving relation therewith, characterized by means (75, 76, 77) provided between said tank (62) and the gas reservoir (71) for selectively supplying said gas mixture (63) from said tank (62) into said gas reservoir (71) or from said gas reservoir (71) into said tank (62), a pressure sensor (69) for sensing the pressure within said tank (62), a temperature sensor (70) for sensing the temperature of the gas mixture (63) of said insulating gas and said refrigerant gas turned into the gaseous phase through evaporation, and control means (78) for controlling the pressure in said tank (62) to be within a preset pressure range through operation or actuation of said conveying means (75, 76, 77), said control means (78) being so set that pressure control be performed for the temperature of .the gas mixture in said tank (62) which is higher than a preset lower value and lower than a preset higher value (Fig. 6).

Claim 8

Dependent Claim 57 words

The apparatus as claimed in claim 5 characterized in that said control means (78) is so set that, during decrease of the gas mixture temperature, the gas pressure is adjusted to the upper limit of the pressure control range of said control means at the critical pressure control temperature, after which the pressure control operation is terminated.

Claim 9

Independent Claim 35 words

The apparatus as claimed in one of the preceeding claims 1 to 6 characterized in that SF 6 gas is used as insulating gas and fluorocarbon C 8 F 16 O is used as refrigerant.

Gas-insulated electrical apparatus

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