Modeling of the Partial Discharge Process in a Liquid Dielectric: Effect of Applied Voltage, Gap Distance, and Electrode Type

Energies

Wenxia Sima²  Chilong Jiang²  Paul Lewin¹  Qing Yang² 

[1] Tony Davies High Voltage Laboratory, School of Electronics and Computer Science, University of Southampton, Southampton SO17 1BJ, UK; E-Mail:;State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China; E-Mails:

关键词: partial discharge;    discharge current;    microscopic model;    space charge;   

DOI  :  10.3390/en6020934

来源: mdpi

【 摘 要 】

The partial discharge (PD) process in liquid dielectrics is influenced by several factors. Although the PD current contains the information representing the discharge process during the PD event, it is difficult to determine the detailed dynamics of what is happening in the bulk of the liquid. In this paper, a microscopic model describing the dynamics of the charge carriers is implemented. The model consists of drift-diffusion equations of electrons, positive and negative ions coupled with Poisson’s equation. The stochastic feature of PD events is included in the equation. First the model is validated through comparison between the calculated PD current and experimental data. Then experiments are conducted to study the effects of the amplitude of the applied voltage, gap distance and electrode type on the PD process. The PD currents under each condition are recorded. Simulations based on the model have been conducted to analyze the dynamics of the PD events under each condition, and thus explain the mechanism of how these factors influence the PD events. The space charge generated in the PD process is revealed as the main reason affecting the microscopic process of the PD events.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.