The Movement Process of Metal Particles in GIS Under High Pressure

Abstract

Gas Insulated Switchgear (GIS) is a complete set of switchgear, such as circuit breaker, disconnector, bus bar, which enclosed in a metal shell filled with SF <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</sub> gas grounding. The presence of internal metal particles will cause partial discharge of GIS, leading to insulation breakdown. The main purpose of this paper is to study the particle movement rules of different shapes and sizes based on different types of voltage, so as to determine a kind of fault map. The fault map is used to estimate the shape and size of the metal particles that cause GIS partial discharge. Based on this purpose, the movement of metal particles under the action of high voltage AC, DC and pulse signals are simulated by electric field simulation and mechanical analysis. The results show that there is no regularity in the movement of particles under AC and DC, but there is regularity in the movement of particles under pulse voltage. Different types and sizes of particles have different trajectories. The movement height of particles is directly proportional to the length of particles, the applied voltage and inversely proportional to the half diameter of particles.