Gas chromatograph for measuring solution gas in transformer oil

Abstract

The invention relates to a gas chromatograph for measuring solution gas in transformer oil. The gas chromatograph is characterized by comprising a residual sample gas self-cleaning system, a back flushing system for C3+ component in transformer oil, an instrument quick stabilizing system and a helium ionization detector, wherein an electromagnetic switch valve used for controlling a gas carrying flow is arranged on the residual sample gas self-cleaning system; the back flushing system for C3+ component in transformer oil comprises a ten-way valve; a quantifying pipe and a needle valve are arranged on the ten-way valve; the instrument quick stabilizing system comprises a four-way valve; the electromagnetic switch valve is connected with a sample injector and then is successively connected with the ten-way valve, the helium ionization detector and the four-way valve. The gas chromatograph for measuring solution gas in transformer oil is low in cost and convenient in operation; the limit of detection can reach 10ppb level; the problems of mutual influences of sample gases and test interference caused by other impurities in gas extruded from the oil can be solved; the stabilizing time of the instrument basically can be controlled within 1 hour.

Description

technical field [0001] The invention relates to a gas chromatograph, and in particular discloses a helium ionization gas chromatograph specially used for measuring transformer oil. Calculate the gas concentration in the transformer oil. Background technique [0002] At present, there are a large number of ultra-high voltage transformers built in China. Due to the high voltage, small discharges and overheating can easily cause major accidents. Therefore, higher requirements are put forward for the detection of dissolved gases in transformer oil. With a hydrogen flame ionization detector C 2 h 2 The minimum detection limit is 0.1ppm, which cannot meet the detection limit requirements, and there is a problem of mutual influence between sample gases, C 3 + The problem that the components cannot be backflushed, the analysis time is increased, and the stability time of the instrument is too long (generally more than 8 hours). Contents of the invention [0003] The purpose of...

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Problems solved by technology

With a hydrogen flame ionization detector C 2 h 2 The minimum detection limit is 0.1ppm, which cannot meet the detection limit requirements, and there is a problem of mutual influence between sample gases, C 3 + The problem that the components cannot be backflushed, the analysis time is increased, and the stability time of the instrument is too long (generally more than 8 hours)

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