Method and device for judging GIS partial discharge amount by using SF6 acidic decomposer concentration

Abstract

The invention discloses a method and a device for judging GIS partial discharge amount by using SF6 acidic decomposer concentration. The device comprises GIS equipment (1) taking an SF6 gas as an insulating medium, a GIS equipment gas taking valve (2), an SF6 acidic decomposer concentration detection device (3), an ultrasonic partial discharge sensor (4), an ultrasonic partial discharge detectiondata processing and display (5), an ultrahigh-frequency partial discharge sensor (6) and an ultrahigh-frequency partial discharge detection data processing and display (7). The method comprises the following steps of: oxidizing a low-valence sulfide in an SF6 acidic decomposer into a water-soluble high-valence sulfur oxide SO3 by using the SF6 acidic decomposer concentration detection device; dissolving the SO3 in water to generate H2SO4, performing titration on the H2SO4 by using a standard alkali liquor, and calculating mass concentration of the acidic decomposer represented by the S element; and combining the detection result with the ultrahigh frequency and ultrasonic partial discharge analysis results, and comprehensively judging the discharge amount of the GIS equipment. According tothe method and the device, the latent partial discharge capacity in the GIS equipment can be precisely judged, and the stable operation of the power grid is ensured.

Description

technical field [0001] The present invention relates to a kind of SF 6 The invention relates to a method and a device for judging the partial discharge amount of GIS by acid decomposition product concentration, which belong to the technical field of substation detection. Background technique [0002] In recent years, with the rapid growth of the national economy and electricity consumption, the number of domestic substations has also increased day by day, and the price of land has also risen. Therefore, new substations generally choose gas-insulated metal-enclosed switchgear (GIS) with a small footprint, which means with SF 6 Gas consumption is also increasing day by day. When partial discharge occurs in GIS internal equipment, SF as an insulating medium 6 The gas will decompose, affecting the insulation strength of equipment and causing unplanned power outages. Therefore, for SF in GIS equipment 6 The detection of gas decomposition products is more important. [0003]...

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Problems solved by technology

[0003] The electric power industry mainly uses ultra-high frequency electromagnetic waves, ultrasonic waves, SF 6 Gas decomposition products are detected to determine whether there is discharge and discharge type in the equipment, but the magnitude of partial discharge cannot be accurately measured, and the signal amplitude can only be measured by UHF and ultrasonic sensors. SF 6 The concentration of gas decomposition products only stays at the stage of isolated analysis of multiple decomposition product components, and no correlation between the total concentration of decomposition products and the magnitude of partial discharge has been found, and there is no relevant information available for reference.

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