Study on Capture Efficiency of Particle Trap and Performance Improvement Method for DC GIL/GIS

Whether the metal particles in dc GIL/GIS can be effectively captured by particle traps affects its safety and stability operation. In this article, a test platform simulation of the real structure is set up to study the influence law of the particle trap on the capture rate. The effect of the key structure parameters and shielding balls on the capture rate of the up-lift particle trap is studied, and a surface coating strategy on the particle trap is proposed to improve the trapping efficiency of the trap. The results show that increasing the length and height of the trap can improve the capture efficiency of the particle, while a too-large or too-small grid is not conducive to trap capture. With the initial lifting position (ILP) of the particle away from the particle trap, the capture rate decreases. The cone-shaped structure is conducive to the particles moving toward the trap direction and the hollow structure had the trapping efficiency of the particles. The research observations also indicate that the shielding balls with cone-shaped outside and hollow inside can improve the capture rate of the particle trap by 37.2% on average. Furthermore, it is found that the surface coating of the particle trap can isolate the charge transfer when moving particles arrive, which can increase the capture rate of the particle trap by 17.2% on average. Accordingly, typical trajectories of particles captured and escaped are analyzed and discussed. This work provides a significant idea to design the particle traps and the controlling strategies of dc GIL/GIS particle pollution.