Gas inflation device of sulfur hexafluoride and nitrogen mixed gas and operation method thereof

Abstract

The invention discloses a gas inflation device of sulfur hexafluoride and nitrogen mixed gas and an operation method of the gas inflation device. Four ports of a four-way valve set communicate with agas inflation unit, a to-be-inflated electric power equipment cavity, a gas state parameter detection unit and a gas uniform buffering unit correspondingly. The gas inflation unit comprises an SF6 gasdistribution branch, an N2 gas distribution branch and a feedback control adjusting module. A gas outlet of the SF6 gas distribution branch and a gas outlet of the N2 gas distribution branch communicate with the gas inlet of the feedback control adjusting module. The SF6 gas distribution branch and the N2 gas distribution branch comprise gas storage bottles, pressure reducing valves, gas pressuremeters and gas flow control valves. The gas state parameter detection unit is used for detecting the gas pressure and mixing ratio of mixed gas in the to-be-inflated electric power equipment cavity.The gas uniform buffering unit comprises a compressor and a buffering tank. The gas inflation device is a portable gas inflation device, is high in mixing ratio control precision, and can reduce the time required by mixing the mixed gas.

Description

Technical field [0001] The invention belongs to the technical field of mixed gas charging, and particularly relates to a charging device for mixed gas of sulfur hexafluoride and nitrogen and an operation method thereof. Background technique [0002] SF 6 It is a strongly electronegative gas, and its molecules have a strong ability to absorb free electrons to form negative ions, so its electrical strength is very high, about 2.5 times that of air in a relatively uniform electric field. SF 6 The boiling point is relatively high, so there is no need to worry about SF in most engineering applications 6 The problem of gas liquefaction. Pure SF 6 Gas is a colorless, odorless, non-toxic and non-flammable inert gas. When the temperature is below 180℃, its compatibility with materials in electrical equipment is similar to nitrogen. SF 6 The biggest advantage is that it does not contain carbon, so it will not decompose carbon particles that affect the insulation performance; and most of i...

AI Technical Summary

Problems solved by technology

However, since the total amount of mixed gas filled in the current transformer cavity cannot be known in advance, it is impossible to pre-mix in the buffer cavity, and it is difficult to precisely control the mixed gas ratio and pressure accuracy; in addition, the existing mixed gas charging device Large volume, it is difficult to meet the portable, fast and accurate filling requirements required for on-site modification

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