Common defects of GIS equipment

Common defects of GIS equipment

GIS equipment includes circuit breakers, busbars, disconnectors, current and voltage transformers, grounding switches, arresters, bushings and transition elements, etc., and they are all assembled in a closed metal enclosure filled with SF6 gas to achieve conductor-to-phase interphase , Shell, ports and reliable insulation between ports. GIS is used more and more widely in the power grid due to the advantages of small space, convenient installation and high reliability. GIS is highly reliable, but if it is not properly controlled during manufacturing, assembly and installation, it may cause defects such as poor contact, number of particles, floating potential, dust, metal tips, etc. If these defects are not found in time, once If a fault occurs, it will take a long time to repair, causing great impact and loss.

In the detection of GIS equipment, the application of partial discharge detection and gas composition detection technology has become more and more common, and has also achieved many results. However, the problems in application experience and the differences in equipment structure, the existing partial discharge detection methods can not completely determine whether there is a defect inside the device, nor can it intuitively and visually determine the location of the internal defect in the GIS device, so in some cases The following created obstacles for the development of GIS equipment detection strategies. The X-ray digital imaging technology can realize the visual imaging of the non-disintegrated internal structure of the equipment on the suspicious air chamber or part of the GIS equipment.

According to the defect analysis of GIS equipment, three types of defects, such as common foreign body, assembly and material, can be detected by X-ray digital imaging technology.

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