Affiliation:
1. Qingdao University of Science and Technology, Qingdao, 266061 China
2. Technical University of Sofia, Industrial Engineering Department, Kliment Ohridski 8, Sofia,1000 Bulgaria
Abstract
Simulation analysis plays an important role in Systems Theory nowadays. In order to reveal the mechanism of space charge injection and generation in the process of liquid dielectric breakdown, the discharge of transformer oil between needle-plane electrodes under high electric field is studied. Based on the 2-D hydrodynamic model and Poisson equation of electric field, the system simulation model of oil discharge by different charge generation mechanism is established, based on which the inception and propagation process of discharge is simulated by COMSOL. By system simulation, the temporal and spatial distribution of the electric field intensity, space charge density, electric potential and temperature of transformer oil is obtained and deeply analyzed. The simulation results prove that the space charge generated by metal field emission and ionic disassociation are neither of the major factor for streamer formation in transformer oil, while the Zener molecular ionization and impact ionization are the major factors. Our research improves the understanding of the inception, propagation and breakdown process for discharge in transformer oil, and also the ionization mechanism in the liquid dielectric
Publisher
North Atlantic University Union (NAUN)
Subject
Electrical and Electronic Engineering,Signal Processing
Reference16 articles.
1. Mauricio Aljure, Marley Becerraand Mattias E Karlsson. On the injection and generation of charge carriers in mineral oil under highelectric fields. J. Phys. Commun. 2019, 3(4):15-27
2. Li Yuan, Mu Hai-Bao, Deng Jun-Bo, Zhang Guan-Jun andWang Shu-Hong. Simulational study on streamer discharge intransformer oil under positive nanosecond pulsevoltage J. Acta Phys. Sin. 2013,62(13):96-108
3. Jouya Jadidian. Charge Transport and Breakdown Physics inLiquid/Solid Insulation Systems. 2013, 102:150
4. Wang Qi, Wang Meng, Wang Jue Yan and Ping. Two-phase streamer characteristics in transformeroil under nanosecond impulses voltages J.HIGH POWER LASER AND PARTICLE BEAMS 2020,32(12): 99-105
5. Luo En-Ze, Liu Yun-Peng, Liu Wei-Dong, Chen Lu-Jun and Zheng Mao-Sheng. Modification of the Fowler-Nordheim Formula for Actual Emitters. J. ACTA ELCTRONICA SINICA. 1996, 24(3): 5-9