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Mixed gas insulating medium containing environmentally friendly gaseous trifluoroiodomethane and preparation method of mixed gas insulating medium

A trifluoroiodomethane and insulating medium technology, which is applied in the direction of insulators, inorganic gases, inorganic insulators, etc., can solve the problems of reduced gas insulation capacity, unfriendly environment, and serious greenhouse effect of gases, and achieve excellent insulation performance and good environmental protection performance Effect

Inactive Publication Date: 2019-02-01
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the reduction of the insulating ability of the gas after mixing, it is necessary to increase the pressure to ensure the insulating effect, which will undoubtedly increase the difficulty and cost of the manufacturing process, and put forward more stringent requirements for the leakage prevention level and safety indicators of the equipment.
To solve SF 6 The greenhouse effect of gas is serious, and it is not friendly to the environment. Find a suitable SF 6 Substitution of insulating gas is the most thorough and effective solution

Method used

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  • Mixed gas insulating medium containing environmentally friendly gaseous trifluoroiodomethane and preparation method of mixed gas insulating medium
  • Mixed gas insulating medium containing environmentally friendly gaseous trifluoroiodomethane and preparation method of mixed gas insulating medium
  • Mixed gas insulating medium containing environmentally friendly gaseous trifluoroiodomethane and preparation method of mixed gas insulating medium

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preparation example Construction

[0033] The preparation method proposed by the present invention emphasizes the sequence and position of inflation, that is, the dense CF 3 I, c-C 4 f 8 The gas is first filled into the closed container from the top, and the CO with low density 2Fill from the bottom, which reduces the mixing rest time and makes the gas mix more uniform.

[0034] When the power frequency breakdown voltage of CF3I / CO2 mixed gas exceeds 20%, the insulation performance of CF3I gas will change little if the CF3I content continues to increase. After fixing the CO2 gas to 70% in the CF3I / CO2 mixed gas, reducing the CF3I gas content, the insulation ability of the mixed gas is improved after adding c-C4F8, and the insulation performance of the mixed gas is basically the same when the c-C4F8 mixed gas reaches 10%. Therefore, when the content of c-C4F8 is higher than 10%, the overall improvement of the insulation performance of the mixed gas is small. Since the GWP of the c-C4F8 gas is 8900, increasing...

Embodiment 1

[0037] Take CF3I, c-C4F8 and CO2 to physically mix at room temperature to obtain an environmentally friendly mixed gas insulating medium. In this insulating medium, the volume fraction of CF3I is 20%, the volume fraction of c-C4F8 is 10%, and CO2 The volume fraction is 70%. The method to obtain this environment-friendly insulating medium is to first pump the closed container to a vacuum state below 10Pa in any metal airtight container with a height less than 30m, and then flush c-C4F8, CF3I, and CO2 gases in sequence. The mixed gas was left to stand for 48 hours to mix well.

Embodiment 2

[0039] Take CF3I, c-C4F8 and CO2 to physically mix at room temperature to obtain an environmentally friendly mixed gas insulating medium. In this insulating medium, the volume fraction of CF3I is 21%, the volume fraction of c-C4F8 is 9%, and CO2 The volume fraction is 70%. The method to obtain this environment-friendly insulating medium is to first pump the closed container to a vacuum state below 10Pa in any metal airtight container with a height less than 30m, and then flush c-C4F8, CF3I, and CO2 gases in sequence. The mixed gas was left to stand for 48 hours to mix well.

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Abstract

The invention relates to a mixed gas insulating medium containing environmentally friendly gaseous trifluoroiodomethane and a preparation method of the mixed gas insulating medium. The components of the mixed gas insulating medium comprise a trifluoroiodomethane gas, an octafluorocyclobutane gas and a carbon dioxide gas. The preparation method includes a vacuuming step and a mixing step. The mixedgas insulating medium can well meet the use requirements of high-voltage power equipment such as gas insulated transformers, gas-insulated combined electrical appliances and gas-insulated transmission pipelines, and has the advantages of excellent insulation performance and high environmental protection performance.

Description

technical field [0001] The invention relates to an insulating medium, in particular to a mixed gas insulating medium containing an environment-friendly gas trifluoroiodomethane and a preparation method thereof. Background technique [0002] Gas-insulated medium and low-voltage electrical equipment usually uses SF6 as the insulating medium. But SF6 is a strong greenhouse gas, its global warming potential (global warming potential, GWP) is CO 2 23900 times of , and since SF 6 Its chemical properties are extremely stable, and it can exist in the atmosphere for as long as 3,200 years. Once it leaks into the atmosphere, it will basically not decompose naturally, so it has a cumulative effect on global warming. In the "Kyoto Protocol" signed in 1997, it is clear that CO 2 , CH 4 , N 2 O, PFC, HFC and SF 6 etc. belong to the scope of greenhouse gases, and require developed countries to first freeze greenhouse gas emissions at the level of the 1990s, and basically limit or ban...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B3/16H01B19/00
CPCH01B3/16H01B19/00
Inventor 钟蕊霜肖登明赵谡谭东现
Owner SHANGHAI JIAO TONG UNIV
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