Process of one-sample introduction dual-detector gas chromatography and transformer oil analysis gas chromatography

Abstract

The invention relates to a process of one-sample introduction dual-detector transformer oil analysis gas chromatography. The gas chromatography comprises a sample introduction opening, three chromatographic columns A, B and C, a double-arm catalytic combustion detector, a hydrogen flame detector, a nickel catalytic converter and a carrier gas system, the chromatographic columns A and B are parallelly connected behind the sample introduction opening, the hydrogen flame detector is in tandem connection with the rear part of the chromatographic column A, the rear part of the chromatographic column B is successively in tandem connection with a first arm of the catalytic combustion detector, the nickel catalytic converter, the chromatographic column C and the catalytic combustion detector, the chromatographic column A at least can separate CH4, C2H6, C2H4 and C2H2, the chromatographic column B at least can separate H2, CO and CO2, and the chromatographic column C at least can separate hydrogen and methane. Compared with conventional process, the process provided by the invention has the following advantages: one detector is omitted, cost for a chromatograph is reduced, usage amount of hydrogen and air is increased, and detection performance indexes are not reduced; the catalytic combustion detector is used to substitute a vulnerable thermal conductivity detector, so cost is lowered down, and difficulty in operating and maintaining the chromatograph is reduced.

Description

technical field [0001] The invention relates to a gas chromatographic analysis method, in particular to a gas chromatographic process for analyzing transformer oil with double detectors for one injection. Background technique [0002] Under normal conditions, oil and paper insulation materials in oil-filled electrical equipment will gradually age and decompose under the action of heat and electricity, producing a small amount of low-molecular hydrocarbons, carbon dioxide, and carbon monoxide. If there is latent overheating or discharge failure in the equipment, the generation of these gases will be accelerated, and some characteristic gases will appear. The analysis and determination of the dissolved gas components and content in insulating oil is one of the very important testing items for oil-filled electrical equipment manufacturing and operation departments, and it is an effective tool for judging latent failures of oil-filled electrical equipment during the factory ins...

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Problems solved by technology

Among them, the double-column split secondary sampling process usually adopts the needle-clamping operation method, which requires high operating quality of the test personnel. Because of the use of the clamping-needle sampling operation method in the work, the baseline jumping instability phenomenon often occurs; double-column splitting The one-time sample injection process of column splitting adopts one-time sample injection, splits according to a certain ratio, and part of the H is separated by the TDX01 column. 2 , 0 2 , CO, C0 2 , the other part is separated by GDX502 column to separate C1-C2 hydrocarbons, and each component is detected by its own detector. This process has fast analysis speed and simple operation, but the instrument has three detectors, which increases the cost of the instrument; double-column series switching The one-time sampling process has high requirements on the instrument. One is the addition of expensive six-way valve components, and the other is strict requirements for switching. The phenomenon of jumping on the baseline and not falling back for a long time

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