Analyzer for gas dissolved in mobile type insulating oil and detection method of gas dissolved in mobile type insulating oil

Abstract

The invention discloses a detection method for analysis of gas dissolved in insulating oil in high voltage electric oil filling equipment. An instrument system capable of performing single column separation, automatic feeding, program control switching and analysis by a single detector is adopted. The detector is a specific semiconductor combustible gas detector. One six-way valve and a quantitative sampling ring as a feeding mechanism are arranged inside the analysis system and are used for achieving the functions of sampling and feeding. The method specifically comprises the following steps: in a base line state, connecting one end of the quantitative ring with sample gas to be measured through an electromagnetic valve, connecting the other end of the quantitative ring with a micro vacuum pump and the electromagnetic valve, and directly feeding carrier gas into the detector through a chromatographic column; in a feeding state, firstly, vacuuming the sampling quantitative ring, when the vacuum degree is 10KPa, closing the electromagnetic valve of the vacuum pump, and switching on the electromagnetic valve at the sample gas end; subsequently turning the six-way valve, accessing the quantitative sampling ring to a carrier gas loop and accessing to the front end of the chromatographic column; and flowing H2, CO, CH4, C2H4, C2H6 and C2H2 into the detector for detection after chromatographic column separation.

Description

technical field [0001] The invention relates to a trace mixed gas detection device and detection technology, in particular to a detection method for analyzing dissolved gas in insulating oil of high-voltage oil-filled electrical equipment. Background technique [0002] At present, domestic power transmission and transformation units need to analyze the dissolved gas in the insulating oil when overhauling high-voltage oil-filled electrical equipment. At this stage, laboratory chromatographic analysis is generally used. This method is also used by the maintenance unit to determine whether the power equipment is out of operation in accordance with. At present, gas chromatographs dedicated to electric oil-filled equipment in China generally adopt a detection system with manual syringe sampling, parallel connection of two columns, split injection, and simultaneous detection by three detectors. The detector usually adopts 1 thermal conductivity detector + dihydrogen ion flame det...

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Problems solved by technology

[0005] Aiming at the problems existing in the prior art, the object of the present invention is to overcome the disadvantages of the above-mentioned three-detector analysis system, such as multiple gas sources, complex hardware structure, low degree of automation, bulky volume, heavy quality, etc., and provide a single carrier gas (99.999 % of high-purity air), automatic sampling, and single-detector analysis of dissolved gas analysis in insulating oil, that is, a simple hardware structure, high degree of automation, small size, light weight, good shock resistance, and can move with the car. The repeatability, accuracy and sensitivity meet the requirements, which is conducive to the large-scale promotion of the analysis and detection method in the power industry

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