Sulfur hexafluoride decomposition product online chromatographic sampling and gas supplementing device and use method thereof

Abstract

The invention relates to a sulfur hexafluoride decomposition product online chromatography sampling and gas supplementing device. A front pressure sensor, a front control valve, a booster pump and a rear control valve are connected in parallel on a pipeline between a combined electric appliance and a sulfur hexafluoride online chromatography and recovery device at one time, and the booster pump isprovided with a rear pressure sensor and a sulfur hexafluoride gas cylinder. The method comprises a gas taking test process and a non-gas taking process in use. Through all the structures and cooperation of the two processes, the sulfur hexafluoride can be automatically taken out from the combined electric appliance. The online chromatographic device can be used for analyzing decomposition products, judging the discharge condition of the gas chamber in real time, detecting the pressure of the gas chamber in real time and supplementing gas, so that the stability of the gas chamber is ensured,and the device is suitable for intensive care of the gas chamber with familial defects and gas discharge signals, and is also suitable for online detection of key equipment.

Description

technical field [0001] The invention belongs to the technical field of on-line chromatographic sampling and gas replenishment methods, in particular to an on-line chromatographic sampling and gas replenishment device of sulfur hexafluoride decomposition products and a use method. Background technique [0002] With the development of the power industry and the improvement of voltage levels, more and more electrical equipment with sulfur hexafluoride as the insulating medium has been put into operation. When there are defects in electrical equipment, discharge phenomena often occur, such as metal particle discharge, tip discharge, suspension discharge, surface flashover and ground breakdown, etc. After this type of discharge occurs, characteristic products of different proportions and concentrations will be produced, such as SO 2 , HF, SOF 2 、CF 4 , SO2F2, H2, etc. However, the decomposition products of sulfur hexafluoride are easily absorbed by the adsorbent and the GIS t...

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Problems solved by technology

However, the decomposition products of sulfur hexafluoride are easily absorbed by adsorbents and GIS tanks after production, and the characteristic products may be lower than the minimum detection limit

[0003] At present, the chromatographic analysis of sulfur hexafluoride in substations is in an offline mode, which cannot detect the decomposition products of sulfur hexafluoride in the equipment in real time, and cannot actually reflect the decomposition of sulfur hexafluoride when a fault occurs, which is not conducive to accurately finding equipment defects, so it is urgently needed A sulfur hexafluoride online chromatographic device accurately detects the decomposition products of sulfur hexafluoride and judges the discharge type

However, the current sulfur hexafluoride on-line chromatography mainly faces an important problem: long-term gas intake from sulfur hexafluoride inflatable equipment for online tests is large, which will cause equipment air pressure to decrease, insulation performance and arc extinguishing performance.

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