Effect of ground electrode on charge injection and surface potential of corona charged polyethylene film |
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| Institution: | 1. University of Southampton, University Road, Southampton, SO17 2GR, United Kingdom;2. School of Chemistry and Biological Engineering, University of Science & Technology Beijing, Beijing 100083, China;3. State Key Laboratory of Electrical Insulation and Power Equipment, Xi''an Jiaotong University, Xi''an 710049, China;4. Global Energy Interconnection Research Institute, Beijing, 102200, China;1. Institut PPRIME, Département Fluide-Thermique-Combustion, Université de Poitiers, Boulevard Pierre et Marie Curie, BP 30179, 86962 Futuroscope-Chasseneuil, France;2. Departamento de Electrónica y Electromagnetismo, Universidad de Sevilla, Facultad de Física, Avenida Reina Mercedes s/n, 41012 Sevilla, Spain;3. Departamento de Física Aplicada III, Universidad de Sevilla, ESI, Camino de los Descubrimientos s/n, 41092 Sevilla, Spain;1. Chair for Multicomponent Materials, Faculty of Engineering, Christian-Albrechts-Universität zu Kiel, 24143, Kiel, Germany;1. Songshan Lake Materials Laboratory, Dongguan, 523808, China;2. Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China;3. Department of Building Science, School of Architecture, Tsinghua University, Beijing, 100084, China;4. Beijing Key Laboratory of Indoor Air Quality Evaluation and Control, Beijing, 100084, China;5. Key Laboratory of Eco Planning & Green Building, Ministry of Education (Tsinghua University), Beijing, 100084, China |
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| Abstract: | The surface potential decay measurement is a simple and low cost tool to assess electrical properties of insulation materials; therefore, understanding the physical mechanisms of the surface potential decay becomes necessary. With our recent space charge measurement results on corona charged samples, bipolar charge injection on corona charged samples had been observed. Based on this new fact, it is anticipated that the ground electrode should have significant effect during corona charging and subsequently decay processes. In the paper, low density polyethylene (LDPE) film with gold ground electrode was compared with LDPE film with aluminium ground to study effect of ground electrode on charge injection and surface potential decay processes. Charging current during the corona charging, surface potential decay and space charge dynamics after corona charging in the samples with either gold coated or aluminium ground electrode were measured. Differences have been observed for gold ground electrode when compared with aluminium ground electrode. Higher work function of gold electrode is responsible for the observed differences. A preliminary simulation has also attempted to show that the bipolar injection may take place in corona charged LDPE films. |
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