Abstract
With the proposal of urban synthesis underground transmission pipeline, the use scenario of GIL will become more and more widespread. When GIL is used at power distribution grid, in order to reduce the line loss and improve surge-impedance loading, compact GIL was designed. Three-phase tri¬post insulator is an important part of it. However, metal defects often appear in GIL. It would weaken the insulation strength if it is not restrained or cleaned up in time. To support the design of GIL particle collector and provide suggestions for cleaning up in the production process, this paper analyzed the influence of metal defects on electric field distribution in detail. A finite element simulation model of three-phase tri-post insulator was built by COMSOL Multiphysics. Metal defects on the insulator surface and near the grounded shell were researched and analyzed. The maximum value of electric field strength changes with the location, axial position, height and size in varying degree. The result can provide reference for design parameters of particle collector like action range, and also provide basis for maintenance.
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