Transient dynamics of packet-like space charge in low-density polyethylene at high temperatures |
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| Institution: | 1. State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China;2. School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China;1. Université de Poitiers (CNRS, ISAE-ENSMA), 86962, Futuroscope, France;2. Toyohashi University of Technology, 7 Toyohashi, 441-8580, Japan;1. TÜV SÜD Process Safety, Basel, Switzerland;2. Swiss Process Safety, Basel, Switzerland;1. College of Food Science and Engineering/Collaborative Innovation Center for Modern Grain Circulation and Safety/Key Laboratory of Grains and Oils Quality Control and Processing, Nanjing University of Finance and Economics, Nanjing 210023, China;2. Department of Statistics/Quantitative Life Sciences Initiative, University of Nebraska-Lincoln, Lincoln, NE 68583, USA |
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| Abstract: | Among features observed in polyethylene-based materials under high fields, packet-like space charge are frequently reported but without complete theory explaining their formation and propagation. The present contribution reports transient dynamics of packet-like space charge in low-density polyethylene (LDPE) under multi-field coupling conditions based on pulsed electro-acoustic (PEA) method. The measurements were carried out under ?125 kV/mm at 20 °C, 40 °C, and 60 °C. Space charge results reveal systematic occurrence of positive packet-like space charge in all samples generated at the anode and then moved toward the cathode. It is observed that higher temperatures contribute to the migration of packet-like space charge and field distortion. Based on the detailed injection model of packet-like space charge, it is shown that electrode injection plays a major role in the formation of positive packet-like space charge, the total amount and depth not only depend on the temperature, but also the negative charges dynamics. Packet-like space charge phenomena at different temperatures still feature NDM relationship with the nonlinear increase of migrate velocity as the rise of temperature. |
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| Keywords: | Low-density polyethylene Space charge Conduction current Multi-field coupling Charge injection Carrier mobility |
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