Simulation of surface flashover probability distribution with gas-solid charge transport/multiplication coupling of epoxy resin

被引：0
|
作者：
Cai S. [1 ]
Min D. [1 ]
Wu Q. [2 ]
Gao Z. [1 ]
Li S. [1 ]
Qin S. [2 ]
Zhu S. [3 ]
机构：
[1] State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an
[2] Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang
[3] State Grid Anhui Electric Power Research Institute, Hefei
来源：
Zhongguo Kexue Jishu Kexue/Scientia Sinica Technologica | 2022年 / 52卷 / 04期
关键词：
Epoxy resin; Failure probability assessment; Surface charge transport; The distribution shape parameter; Weibull-distribution of surface flashover voltage;
D O I：
10.1360/SST-2021-0413
中图分类号：
学科分类号：
摘要：
The insulation failure of key equipment in power systems caused by gas-solid interface flashover of basin insulators is a key scientific problem that must be solved urgently. The time and space scales of gas electron multiplication and solid-surface charge evolution span multiple orders of magnitude, resulting in an unclear physical mechanism of the gas-solid coupling interface discharge of a basin insulator. A gas-solid coupling surface flashover model was established considering three junction point charge injection, solid surface charge transport, and gas collision ionization. The violent collision ionization in the gas caused by electrons emitted from the solid was taken as the surface flashover criterion. The key parameters characterizing surface charge transport and gas collision ionization were extracted based on gas-solid coupling surface flashover, and a model considering random variables was established to simulate the flashover voltage distribution of epoxy resin. The flashover voltage obeys the Weibull distribution when the charge transport parameters are Gaussian random variables, and the simulation results are consistent with the experimental results. By comparing the simulation and experimental results, it is found that the characteristic flashover voltage and distribution parameter are mainly controlled by the gas and solid media, respectively, and each charge transport random variable has a different effect on the distribution shape parameter. The Weibull distribution of flashover voltage consistent with the experimental results can be obtained by adjusting the standard deviation of charge transport random variables. This research explains the relationship between the Weibull distribution of flashover voltage and the charge transport and gas collision ionization parameters, providing an effective method to simulate the probability distribution characteristics of flashover voltage, which can also be used to evaluate the failure probability of the gas-solid interface under a certain voltage. © 2022, Science Press. All right reserved.
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页码：639 / 650
页数：11
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