51 / 2018-08-20 13:39:56

Partial Discharge Detection and Structure Optimization of a Bushing of 10 kV Switchgear Cabinet

switchgear cabinet,bushing,live detection,finite element method,electric field intensity,structure optimization

Abstract-Bushing of 10 kV switchgear cabinet is prone to partial discharge. Though live detection can find out partial discharge, the mostly used ultrasonic(AE) and transient earth voltage(TEV) methods have some limitations. This paper introduces a typical case which detected bushing erosion based on ultrasonic(AE) and Ultra-high frequency (UHF) methods. Furthermore, this paper simulates the electric field distribution of bushing using finite element method(FEM), which confirms the live detection conclusion that the metal plate and the busbar were not connected and thus led to local electrical field distortion and suspended discharge. At last, this paper optimized the structure of bushing of 10 kV switchgear based on finite element method(FEM) and insulation structure optimization principles. The optimized bushing of 10 kV switchgear has a significantly better electrical performance and can effectively avoid partial discharge caused by the defects produced during installation and operation.