Gas-chromatography detection method used for power transformer oil

Abstract

The invention relates to a gas chromatography detection method used for detecting power transformer oil, adopting an analyzing system with one time sampling, parallel double columns, one time shunt and simultaneous detection of two detectors. An auxiliary loading gas way is added in a gas loading inlet pipe of a detection system. The regulation is implemented according to the air flow of a main loading gas way, the air flow of the auxiliary loading gas way and a needle valve which is added on the auxiliary loading gas way in a compulsory shunting way. Thus, a detected sample is shunted into two chromatographic columns which are connected with the main loading gas way and the auxiliary loading gas way in parallel for analyzing hydrocarbon compositions and H2, CO and CO2 compositions to finish the composition analysis of the transformer oil. A nickel reformer which can control temperature is added on the gas way after the chromatographic column separation of the auxiliary loading gas way and the detection of a thermal conducting detector. The auxiliary loading gas way and the main loading gas way reformed by the nickel reformer together enter a flame ionization detector through a tee for the detection. A hydrogen pipe from a hydrogen inlet to the left end inlet of the reformer in the auxiliary loading gas way is connected in parallel with a hydrogen pipe from an original hydrogen inlet to the flame ionization detector.

Description

technical field [0001] The invention relates to a gas chromatography detection device and detection technology, in particular to a gas chromatography detection method for power transformer oil detection. Background technique [0002] At present, domestic special gas chromatographs used for power transformer oil detection generally adopt an analysis technology system of one-time sample injection, two-column parallel connection, one-time split flow, and three detectors for simultaneous detection. However, due to the performance of domestic gas chromatography instruments, such as: detector sensitivity, automatic control, furnace technology and overall performance of the instrument (such as repeatability and reproducibility), there is a certain gap compared with imported similar products. [0003] Therefore, in order to avoid the above-mentioned weaknesses of domestic chromatographic instruments, some power users also choose Shimadzu GC-14B, GC-14C, and GC-2014 chromatographs im...

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Problems solved by technology

However, because the power transformer oil gas chromatograph produced by Agilent is based on the European ASTM standard (different from the domestic detection technology process design), there is a big difference between the chromatographic standards implemented in the domestic power system industry, and the price is expensive. Each set is more than 40 It is difficult to be widely accepted by domestic users

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