Gas chromatography for measuring gas content and characteristic gas in insulating oil completed at one time of sample injection

Abstract

This invention publishes a kind of gas phase chromatography method which can measure the air content and the specific gas in the insulating oil with just once sampling. This invention uses Ar as carrier gas. It also uses the packed column sample entrance. What is more, it has six-way value color-spectrum-switching column, heat transmission detector and the H-fire ionization detector. During the process, Ar is divided into 2 parts. One part will directly go out after it goes through the heat transmission detector's reference arm 6, while the other part will go by steps through the sample entrance 1, the first color spectrum column 2, the six-way value 4, the second color spectrum column or gas lock 3, the heat transmission detector 7, the Ni catalysis CH4 converter 8 with H2, and at last the H fire ionization detector 9 with the air. Then it will go out. During the only one sampling, the invention can meanwhile measure the air content and analyze the accident specific gas in the simple oil. To sum up, it operates easily, needs little work and can decrease the analysis error relatively. So it can do the work of analyzing the sample oil which has low degassing ratio well, as it can satisfactorily separate all the groups.

Description

technical field [0001] The invention relates to a gas chromatographic method for measuring the gas content and characteristic gas in insulating oil, in particular to a gas chromatographic method for measuring the gas content and characteristic gas in insulating oil in one injection. Background technique [0002] The gas content in the insulating oil is an important acceptance index before the 500kV oil-filled equipment is put into operation, and it is also an important basis for measuring the operation status of the oil-filled equipment. The size of the air content not only affects the operation safety of the equipment, but more importantly, it directly affects the aging speed of insulating oil and paper, that is, the operating life of the equipment; therefore, it is more and more valued by power production units such as power plants and power supply bureaus. . [0003] At present, the methods for measuring the gas content of insulating oil include vacuum differential press...

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Problems solved by technology

[0004] 1. Due to the high requirements of vacuum instruments, it is not easy to popularize, so the determination of gas content by vacuum differential pressure method has certain limitations

[0005] 2. The carbon dioxide elution method is only applicable to the determination of oil products without acid gas

The advantage is that you only need to operate one set of gas system and one instrument when measuring the gas content; the disadvantage is that you need to inject two samples for the measurement of the gas content and the usual chromatographic analysis, which increases the usual workload, so few units use this method

[0014] The search and comparison of "Novelty Retrieval Center of Hubei Provincial Institute of Science and Technology Information" (a national first-level scientific and technological novelty search consulting unit) shows that: in the report on the detection of the content of 9 gas components in oil, there is no single injection and the same chromatogram There is no report on the process, and there is no report that the minimum detection concentration can meet the requirements of the standard without temperature programming.

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