On-site testing for mobile particles in GIS under impulse voltages

Abstract

The work models the performance of mobile particles in compressed-gas-insulated substations under an intentionally applied impulse voltage of reduced magnitude. The subsequent microdischarges are used to detect the presence of particles and identify their approximate sizes. A comprehensive computer model is described. It describes and interrelates the potential and field distributions on and around the particle, particle lifting and movement, timing of the initial microdischarge, and the complete pattern of the microdischarges as might be detected by an external monitoring circuit.<>