Study on the Transition from Glow Corona to Streamer Discharge of the UHVDC Overhead Transmission Line During the Downward Leader Descending Process
夏德智1, 贺恒鑫1*,*, 陈杉杉1, 殷禹2, 李鹏2, 余军3, 何俊佳1, 陈维江3
1.华中科技大学电气与电子工程学院强电磁工程与新技术国家重点实验室,湖北省 武汉市 430074
2.中国电力科学研究院有限公司,北京市 海淀区 100192
3.国家电网公司,北京市 西城区 100031
XIA Dezhi1, HE Hengxin1,*, CHEN Shanshan1, YIN Yu2, LI Peng2, YU Jun3, HE Junjia1, CHEN Weijiang3
1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology), Wuhan 430074, Hubei Province, China
2. China Electric Power Research Institute, Haidian District, Beijing 100192, China
3. State Grid Corporation of China, Xicheng District, Beijing 100031, China
基金项目:
国家重点研发计划项目(2016YFB0900801);
国家自然科学基金项目(51607076);
国家电网公司科技项目(GYW17201600056);
National Key R&D Program of China (2016YFB0900801);
Project Supported by National Natural Science Foundation of China (51607076);
Science and Technology Project of State Grid Corporation of China (GYW17201600056);
In order to study the effect of corona space charge on the initiation of subsequent streamer discharges of the UHVDC overhead transmission line during thunderstorms, a 2D numerical simulation model is established to calculate the distribution of the corona space charge during a thunderstorm based on a second-order accurate finite volume method and Kaptzov’s assumption. The accuracy of the model was verified by comparing the measured and simulated corona discharge current of horizontal single line under dynamic electric field. The corona current waveform and space charge distribution characteristics of a typical ±1100kV UHVDC overhead transmission line subjected to the thundercloud and the downward leader was calculated. It is concluded that the descending process of downward leader will significantly increase the density of positive ions in vicinity of ground wires, where the distance to the ground wire is in the range of about 0.5m. The maximum value of corona discharge current of the conductor and the ground wire increases 6~7 orders of magnitude in response to the downward leader, when compared with the steady state value under the thundercloud electric field. As the increasing of the positive ion density near the surface of the ground wire, the location of the maximum electric field will moves far away from the surface of the ground wire. It will trigger the initiation of the subsequent streamer discharge. The work lays a foundation for further study on the influence of the space charge layer on the lightning attachment to UHVDC overhead transmission line.
KEY WORDS :thunderstorm;UHVDC overhead transmission line;second-order accurate finite volume method;corona space charge;downward leader;streamer;
图7
下行先导阶段线路表面附近电晕空间电荷随先导头部距地高度的变化
Fig. 7
Variation of corona space charge distribution near the surface of lines over the height of the downward leader tip during the descent of the downward leader
图11
地线GW1和GW2电晕向流注转化时刻对应的下行先导头部临界高度
Fig. 11
The critical height of the downward leader head corresponding to the time when corona translates into streamer for the ground wire GW1 and GW2
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