With the development of the electrical power industry, the enhancement in voltage level yields new challenges to insulation of high voltage power equipment. Such challenges become even more remarkable as the compactness and the miniaturization of the equipment are required by power consumers. Accordingly, insulation safety plays a very important role in the reliable service of the equipment. Electric charges appearing in insulating material or at the material surface have been recognized as a critical reason for electric field distortion which triggers insulation breakdown failure. Understanding of the charge behaviour is thereby essential for the design and the ageing evaluation of insulation installed in the equipment. Over the past 40 years, the progresses of measuring techniques have enabled researchers the in-depth investigation of the charge dynamic behaviour and its related insulation performance. This Special Session aims to present the most recent advances in electric charge related studies including measuring technique, theory, modelling, design and especially its role in modulating the performance of insulating materials.

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Dr. Zhonglei Li is currently an associate professor at the School of Electrical and Information Engineering, Tianjin University. He mainly engaged in research on the insulation failure mechanism, space charge modulation and the methods to enhance the insulation performance of high-voltage AC/DC cables. He is the senior member of CSEE, the member of Power Transmission and Transformation Materials Committee, the young member of the CSEE High Voltage Technical Committee and the CES Plasma and Applications Technical Committee. He is also the member of IEEE PES DC Power Transmission and Transformation Equipment Subcommittee. He has published 70 SCI papers such as IEEE TDEI, and had a h-index of 25 in Google Scholar. The applicant published 2 monograph as an associate editor, and publication 5 English monographs in the field of power cable insulation.

Dr. Xiaolong Li received his Ph.D. degree from Tianjin University in 2017. He worked as a Research Fellow at The University of Liverpool from 2018 to 2019. He is currently an associate professor at the School of Electrical Engineering, Shenyang University of Technology. He is also the Director of The Institute of High Voltage and Power System, Deputy Director of Department of Electrical Engineering at this university. He has been actively engaged in research on surface charge simulation and measurement, insulation performance of GIS/GIL, gas discharge and switching technology. He is a young member of the CSEE High Voltage Technical Committee and the CES Plasma and Applications Technical Committee. He is also the Deputy Secretary-General of the Sub-Technical Committee on Basic Theory of Electric Arc in IEEE PES (China).