Finite Element simulation based sensitivity analysis of UHF sensing modes for PD detection

Ultra-High-Frequency (UHF) method is an effective approach to PD detection. Currently the UHF couplers applied for partial discharge monitoring are classified into three types according to their installation places: internal couplers, external couplers and dielectric window couplers. Sensitivity analysis of these three sensing modes is carried out based on Finite Element Method simulation by using real GIS model. Simulation results indicate that the sensitivity of dielectric window couplers are nearly equivalent with that of internal couplers, while it apparently exceeds the sensitivity of external ones. Considering some other advantages of dielectric window sensors such as easy dismantling, having no impact on electrical equipment operating, convenience for maintenance, the article proposes to popularize dielectric window sensing mode for UHF PD detection.