Device and method for detecting mixed gas decomposition products of perfluoro-isobutyronitrile and carbon dioxide

Abstract

The invention discloses a device and a method for detecting mixed gas decomposition products of perfluoro-isobutyronitrile and carbon dioxide. The device comprises a gas decomposition module and a gasdetection module, wherein the gas decomposition module comprises an alternating current power source, a voltage regulator, a transformer, a resistor, a capacitor, a rectifier diode, a barometer, a closed cavity, a needle plate electrode, a gas valve and a micro-water generating device. The gas detection module mainly includes a gas bottle, a pressure reducing valve, a gas purifier, a GC-MC gas chromatography mass spectrometer, a gas collecting bag, an exhaust gas recovery device and a computer. During the stage of a discharge test, the closed cavity is filled with a small amount of water andoxygen and a proportion of mixed gas of the perfluoro-isobutyronitrile and carbon dioxide, the needle plate electrode of the cavity is subjected to pressure boosting by a high-voltage power source, after the corona discharge occurs, pressure boosting is stopped, and the voltage for 12 hours is maintained; and in the stage of gas detection, the gas collecting bag collects gas to be tested and the gas chromatography mass spectrometer is turned on, the gas in the gas collecting bag is injected into an instrument for detection, and the gas to be tested is subjected to the qualitative and quantitative treatment.

Description

technical field [0001] The invention relates to the fields of high-voltage insulation technology and gas component detection, in particular to a device and method for detecting decomposition products of mixed gas of perfluoroisobutyronitrile and carbon dioxide. Background technique [0002] SF 6 It is a colorless, odorless, non-toxic and non-flammable inert gas. It has no corrosive effect on metals and other insulating materials, and has good insulating properties. It is widely used in gas-insulated equipment as an insulating gas. But in practice SF 6 There are many shortcomings: SF 6 It is easy to liquefy in low temperature environment, and it is easy to cause electric accidents when used in cold areas; SF 6 Listed as one of the six major greenhouse gases, its greenhouse effect potential index is as high as 23,900, and its survival life in the atmosphere exceeds 3,000 years. The greenhouse effect it brings cannot be underestimated; SF 6 The gas is sensitive to the inhom...

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Problems solved by technology

But in practice SF 6 There are many shortcomings: SF 6 It is easy to liquefy in low temperature environment, and it is easy to cause electric accidents when used in cold areas; SF 6 Listed as one of the six major greenhouse gases, its greenhouse effect potential index is as high as 23,900, and its survival life in the atmosphere exceeds 3,000 years. The greenhouse effect it brings cannot be underestimated; SF 6 The gas is sensitive to the inhomogeneity of the electric field, and its insulation strength drops sharply when the electric field is extremely inhomogeneous; SF 6 Under discharge, it often reacts with micro-water and micro-oxygen to form highly corrosive and toxic substances, which seriously threatens the normal operation of gas-insulated equipment and the health and safety of electric personnel.

Perfluoroisobutyronitrile and carbon dioxide mixed gas as a new alternative medium, relative to SF 6 The research on the discharge decomposition of gas started late, and the research on the detection devices and methods of various products is still immature, and further research is needed

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