Fluorine-carbon mixed gas insulated switchgear based on carbon deposition suppression technology

Abstract

The invention provides a fluorocarbon mixed gas insulation switching device based on the carbon deposit suppression technique. The gas insulation device comprises a sealed container (1), wherein the sealed container (1) is filled with arc-extinguishing gas which refers to the fluorocarbon gas containing carbon. At least one pair of electrodes is installed inside the sealed container (1). When the power is on, the electric conduction can be achieved through the electrodes. When the power is off, the arc-extinguishing gas extinguishes an electric arc generated between the electrodes. The gas insulation device further comprises an airblast-controlling unit (13) which is installed outside the sealed container (1). The airblast-controlling unit (13) and the sealed container (1) are insulated. The airblast-controlling unit (13) controls and injects the buffer gas to be injected into the arc position of the gas insulation device. The buffer gas refers to one of O2, SF6, H2 and dry gas.

Description

Technical field [0001] The invention relates to a gas-insulated switchgear, in particular to a switchgear using a fluorocarbon mixed gas as an insulating medium. Background technique [0002] SF 6 Gas has good insulating ability, arc extinguishing ability, chemical stability and non-toxicity, so it is widely used in gas insulated equipment, such as gas insulated transformer, gas insulated circuit breaker, gas insulated power transmission pipeline, etc. However, pure SF 6 The gas is very sensitive to the unevenness of the electric field, and has high requirements for equipment processing; and SF 6 Discharge decomposition products of gas, such as SO 2 F 2 , SOF 2 , SF 4 , SF 2 , H 2 S, SOF 4 Etc., are highly toxic substances, which pose a great threat to the health of personnel; in addition, SF 6 The greenhouse effect of gas is very large, and its global warming potential (GWP) is approximately CO 2 It is 23900 times that of gas, and its life in the atmosphere is about 3200 years. T...

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Problems solved by technology

However, there are also the following problems: due to the c-C in the above gas 4 f 8 (octafluorocyclobutane), C 3 f 8 etc. contain carbon elements, so under the arc generated when the current is broken, there is a problem of free carbon being generated during the process of gas dissociation and recombination. If the generated carbon is attached to the surface of a solid insulator such as an insulating spacer , may cause a significant reduction in the electrical insulation performance of the part

[0007] Patent Japanese Patent Laid-Open No. 2007-258137 proposes that in the case of applying the gas containing the above-mentioned carbon-containing elements to the switchgear, by mixing an appropriate amount of O in the insulating gas 2 , H 2 etc., can suppress the generation of free carbon generated when the current is interrupted, and prevent the decline in electrical performance caused by the production of free carbon. However, O 2 It is a representative substance that promotes the deterioration of organic materials or metals. According to the method described in the sealed box, O 2 Gas, which will shorten the life of the equipment and increase the maintenance times of the equipment

while using H 2 As a mixed gas, due to H 2 Its insulation performance is weak, which will reduce the performance of the equipment. At the same time, the H 2 The molecule is small, in order to ensure airtightness, more strict sealing measures need to be taken, which greatly increases the volume and cost of the equipment

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