Stepped Propagation Characteristics of Leader for Positive Discharge in Long Air Gaps

被引：0
|
作者：
Wang P. [1 ]
Liu X. [1 ]
Lü F. [1 ]
Geng J. [1 ]
Ding Y. [2 ]
Yao X. [2 ]
机构：
[1] Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense, North China Electric Power University, Baoding
[2] China Electric Power Research Institute, Haidian District, Beijing
来源：
Dianwang Jishu/Power System Technology | 2021年 / 45卷 / 02期
关键词：
Leader; Long air gap discharge; Photomultiplier tube; Stepped propagation; Switching impulse;
D O I：
10.13335/j.1000-3673.pst.2020.0169
中图分类号：
学科分类号：
摘要：
The leader development is the main process of long air gap discharge. It is of great significance to obtain the optical shape and instantaneous optical power information of the discharge channel for analyzing the characteristics of the leader development. Based on the photomultiplier tube, a comprehensive observation platform of 3-m rod-plane gap discharge is constructed with high-speed cameras and other equipment to measure the instantaneous optical power and simultaneously take the optical image of the discharge channel under the application of the positive standard switching impulse voltage. The test results show: At the same operating impulse voltage, there are several branches of stepped propagation in leader channel. Based on the instantaneous optical power signal of the discharge channel collected by the photomultiplier tube with the characteristics of rapid response, the spatiotemporal distribution characteristics of the leader development speed are obtained by combining discharge process picture with the growth rate relatively fast at the beginning, about 2.25×105m/s; and the development rate slowed down to 5.21×104m/s subsequently when the flow of the leader head is inhibited by the distorted electric field generated by the positive charge. The experimental data in this paper further reveals the characteristics of the leader development of rod-plane discharge, which will provide reference for the follow-up rod-plane discharge test and physical model research. © 2021, Power System Technology Press. All right reserved.
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页码：818 / 824
页数：6
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