Chin.Phys.Lett.    2016, Vol. 42 Issue (4) : 1018-1027     DOI: 10.13336/j.1003-6520.hve.20160405019
Special Issue for the 61th Anniversary of High Voltage Department of Xi'an Jiaotong University |
Development Processes of Positive and Negative DC Corona Under Needle-plate Electrode in the Air
LIU Min1, TANG Ju1,2, PAN Cheng2
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chong-qing 400030, China;
2. School of Electrical Engineering, Wuhan University, Wuhan 430072, China
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Abstract In order to investigate the development processes of DC corona in dry air, a PD(partial discharge) measurement system was constructed, and a series of experiments about positive and negative corona under a needle-plane electrode with variable gap distance were conducted. Experimental results reveal that the positive corona will successively experience the processes of burst streamer discharge, periodic streamer discharge, glow discharge and brush streamer discharge when the applied voltage increases, while the negative corona will experience the discharge process of Trichel, which is divided into three stages, namely, the early, mid, and jagged, and glow discharge. In addition, the pulse amplitude and repetition rate of positive corona in burst streamer discharge stage will hardly change with increase in gap distance under the same voltage increase, but the increase range of them and the maximum value of pulse amplitude will decline in the brush streamer discharge stage, and the maximum value of repetition rate increases. For the negative corona, the pulse amplitude ,the maximum value of pulse amplitude and the increase rates of pulse repetition in Trichel discharge stages will drop, while the maximum values of repetition rates are very close. The reasons of causing the difference discharge development can be attributed to the different ways of positive and negative space charge gathering or migrating, while the electric field of ionization area is strengthened or weakened by the space charges for their different transfer rate.
Keywords DC      corona      discharge stage      needle-plane model      space charge      discharge parameter     
Issue Date: 10 January 2017
 Cite this article:   
LIU Min, TANG Ju, PAN Cheng. Development Processes of Positive and Negative DC Corona Under Needle-plate Electrode in the Air[J]. Chin.Phys.Lett.,2016, 42(4): 1018-1027.
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http://cpl.iphy.ac.cn/newweb/EN/10.13336/j.1003-6520.hve.20160405019
http://cpl.iphy.ac.cn/newweb/EN/Y2016/V42/I4/1018
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