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Mixed gas arc extinguishing medium containing environment-friendly gas heptafluoroisobutyronitrile and preparation method of mixed gas arc extinguishing medium

A technology of heptafluoroisobutyronitrile and mixed gases, which is applied in the direction of inorganic gases, insulators, electrical components, etc., can solve the problems of unfriendly environment, reduced gas arc extinguishing ability, and serious greenhouse effect of gases, and achieves excellent environmental protection performance, extinguishing Excellent arcing ability and excellent arc extinguishing performance

Pending Publication Date: 2021-03-12
云南电网有限责任公司保山供电局
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the reduced arc extinguishing ability of the mixed gas, it is necessary to increase the pressure to ensure the arc extinguishing 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 the problem is not friendly to the environment. Finding a suitable SF 6 Substitution of insulating gas is the most thorough and effective solution

Method used

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  • Mixed gas arc extinguishing medium containing environment-friendly gas heptafluoroisobutyronitrile and preparation method of mixed gas arc extinguishing medium
  • Mixed gas arc extinguishing medium containing environment-friendly gas heptafluoroisobutyronitrile and preparation method of mixed gas arc extinguishing medium
  • Mixed gas arc extinguishing medium containing environment-friendly gas heptafluoroisobutyronitrile and preparation method of mixed gas arc extinguishing medium

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preparation example Construction

[0030] The preparation method of the mixed gas arc extinguishing medium containing environment-friendly gas heptafluoroisobutyronitrile preferably comprises the following steps:

[0031] (1) Get a closed container, a high vacuum valve and a bottom inflation valve are installed at its bottom, and a top inflation valve is installed at its top;

[0032] (2) First vacuumize the closed container through the high vacuum valve, then fill heptafluoroisobutyronitrile gas and octafluorocyclobutane gas from the top inflation valve, and carbon tetrafluoride gas from the bottom inflation valve. The components are charged according to the set content and mixed evenly to obtain the target product.

[0033] As a preferred embodiment of the present invention, in step (2), the degree of vacuum in the closed container is sufficient to be evacuated to a vacuum state below 10 Pa.

[0034] As a preferred embodiment of the present invention, in step (2), in the inflation process, first charge hepta...

Embodiment 1

[0038] take C 4 f 7 N, c-C 4 f 8 and CF 4 Perform physical mixing at normal temperature to obtain an environmentally friendly mixed gas arc extinguishing medium. In this arc extinguishing medium, C 4 f 7 The volume fraction of N is 20%, c-C 4 f 8 The volume fraction is 10%, CF 4 The volume fraction is 70%. The method to obtain this environment-friendly arc extinguishing 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 it into c-c 4 f 8 , C 4 f 7 N. CF 4 gas. The mixed gas was left to stand for 48 hours to mix well.

Embodiment 2

[0040] take C 4 f 7 N, c-C 4 f 8 and CF 4 Perform physical mixing at normal temperature to obtain an environmentally friendly mixed gas arc extinguishing medium. In this arc extinguishing medium, C 4 f 7 The volume fraction of N is 21%, c-C 4 f 8 The volume fraction is 9%, CF 4 The volume fraction is 70%. The method to obtain this environment-friendly arc extinguishing 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 it into c-c 4 f 8 , C 4 f 7 N. CF 4 gas. 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 arc extinguishing medium containing environment-friendly gas heptafluoroisobutyronitrile and a preparation method of the medium. The mixed gas arc extinguishing medium is mainly composed of heptafluoroisobutyronitrile, octafluorocyclobutane (c-C4F8) and carbon tetrafluoride (CF4), and the mixed gas arc extinguishing medium comprises the following components inpercentage by volume: 20-25% of C4F7N, 5-10% of cC4F8 and 70% of CF4. The mixed gas arc extinguishing medium can be used for replacing sulfur hexafluoride (SF6) to serve as a novel environment-friendly arc extinguishing medium to be applied to medium-low voltage armored metal-enclosed switchgear.

Description

technical field [0001] The invention relates to an arc extinguishing medium, in particular to a mixed gas arc extinguishing medium containing environment-friendly gas heptafluoroisobutyronitrile and a preparation method thereof. Background technique [0002] Gas-insulated medium and low voltage electrical equipment usually uses SF 6 As an arc extinguishing medium. But SF 6 It is a strong greenhouse gas with a global warming potential (GWP) of 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...

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 冯俊宗何光层聂剑锋张树培刘全谢玉华常景杨永济熊红英孙利雄
Owner 云南电网有限责任公司保山供电局
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