Research on Location Method of PD Signal for Metal-Clad Switchgear

摘要

It is well known that the occurrence of partial discharge phenomena within switchgears can lead to their destruction. Early detection can avoid failures of electrical equipment. The work of this paper mainly provides theoretic foundation for precise partial discharge (PD) location in switchgears. Hyperboloid method and spatial grid search method are proposed to locate PD source with transient earth voltage (TEV) test. Finite-difference time-domain (FDTD) is used to simulate the propagation process of TEV signal and validate the proposed method. Laboratory test on operating switchgear was conducted and the test results were in consistent with the simulation.