A Review of Knowledge-Based Defect Identification via PRPD Patterns in High Voltage Apparatus

Abstract

Partial discharge (PD) as one of well-known signatures of defects in the insulation system of high voltage equipment has been studied over eight decades. It is of a great interest to power grid operators and owners to identify and distinguish local weak spots in insulation system of the key components of power system by using the obtained PD information to make timely decision thus to avoid any unexpected failures in the system. This article reviews the research progress of PD in high voltage apparatus, including motors and generators, cables, transformers and gas insulated equipment, with attempts to assess the severity of different types of PD initiating defects as well as key PD features that can be selected for classifying defects. Experimental and on-site test results for each type of discharge and defect associated are summarized and discussed. Also, development of these defects during operation of equipment caused by changes in physical and chemical parameters of defect and/or insulation, and its impact on phaseresolved PD pattern variation are thoroughly explained. It is expected that this paper can provide a comprehensive guideline for PD data analysis of available PD information extracted by conventional PD acquisition instruments for both engineers and asset managers of high voltage apparatus. INDEX TERMSPartial Discharge (PD), high voltage motor, power cable, power transformer, GIS, GIL. Tohid Shahsavarian received the Bachelor's degree in Electrical Engineering from the University of Tabriz in 2011, and the Master's degree from the University of Science and Technology (IUST) in 2013. Then, he worked in the Department of Transmission and Distribution in Monenco Iran Consulting Engineers Company.He is currently working toward the Ph.D. degree at the Electrical and Computer Engineering Department of the University of Connecticut, and his research interests include the partial discharge analysis and risk assessment of AC and DC power cables, enhancement of insulation performance in electrical and electronic components for aerospace application, reliability analysis and protection of HVAC/HVDC grids, geomagnetic disturbances (GMD).

Study of partial discharges measurement cycles effect on defect recognition for underground cable joints

“…Phase-resolved partial discharge (PRPD) representation is a widely recognized method that offers clear and consistent visualization of PD sources [9]. It effectively extracts features from PD signals and elucidates the phase-position paths concerning the sinusoidal voltage applied [10][11][12][13]. In this study, PRPD data were acquired using a PD detector, providing the relationship between the working frequency phase angle (φ), number of PD discharges (n), and magnitude of charge (q).…”