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Surface charge dynamics studied by the temporal evolution of the corona charging current
Institution:1. KTH-Royal Institute of Technology, School of Electrical Engineering, Teknikringen 33, SE-100 44, Stockholm, Sweden;2. DIT-Dar es Salaam Institute of Technology, Department of Electrical Engineering, P.O. Box 2958, Dar es Salaam, Tanzania;1. Department of Mathematics and Computer Science, Izmir University, Izmir 35350, Turkey;2. L.N. Gumilyov Eurasian National University, Astana, Kazakhstan;1. IRAMIS, LIONS, UMR NIMBE CEA-CNRS, CEA-Saclay, F-91191 Gif-sur-Yvette Cedex, France;2. Institute of Solid State Physics, Russian Academy of Sciences, 2 Academician Ossipyan Str., Chernogolovka, Moscow District 142432, Russia;1. Rutgers, The State University of New Jersey, Piscataway, NJ 08854, United States;2. The University of Texas at Arlington, Arlington, TX 76019, United States;3. The University of North Carolina at Charlotte, Charlotte, NC 28223, United States;1. Commissariat à l’énergie atomique et aux énergies alternatives, Centre de Marcoule, BP 17171, 30207 Bagnols-sur-Cèze Cedex, France;2. Université de Pau et de Pays de l’Adour, Laboratoire SIAME, Avenue de l’Université, BP 1155, 64 013 Pau Cedex, France
Abstract:The decay of surface charges deposited on the dielectric material by the partial discharge (PD) activity has a great impact on the repetition of partial discharges. In this work, the effect of dielectric placed on the surface of ground electrode in a needle-plane configuration on the discharge activity was investigated, with the application of a periodic negative step voltage. The charge decay mechanisms on a corona charged dielectric surface were investigated based on a comparison between experiments and a FEM-based numerical model. The comparison indicates that the surface charges may decay due to different mechanisms depending on the applied stress.
Keywords:Corona discharge  Surface charge decay  Bulk conduction  Surface conduction  Diffusion
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