Experimental Study on Branch and Diffuse Type of Streamers in Leader Restrike of Long Air Gap Discharge

CHEN She (陈赦); ZENG Rong (曾嵘); ZHUANG Chijie (庄池杰); ZHOU Xuan (周旋); DING Yujian (丁玉剑)

doi:10.1088/1009-0630/18/3/15

Plasma Science and Technology > 2016 > 18(3): 305-310. > DOI: 10.1088/1009-0630/18/3/15

CHEN She (陈赦), ZENG Rong (曾嵘), ZHUANG Chijie (庄池杰), ZHOU Xuan (周旋), DING Yujian (丁玉剑). Experimental Study on Branch and Diffuse Type of Streamers in Leader Restrike of Long Air Gap Discharge[J]. Plasma Science and Technology, 2016, 18(3): 305-310. DOI: 10.1088/1009-0630/18/3/15

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Experimental Study on Branch and Diffuse Type of Streamers in Leader Restrike of Long Air Gap Discharge

1Department of Electrical and Information Engineering, Hunan University, Changsha 410082, China 2Department of Electrical Engineering, Tsinghua University, Beijing 100084, China 3China Electric Power Research Institute (CEPRI), Beijing 100192, China

Funds: supported by the Fund of the National Priority Basic Research of China (2011CB209403) and National Natural Science Foundation of China (Nos. 51325703, 51377094, 51577098)

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Received Date: September 07, 2015

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Abstract

Abstract

One of the main problems in the Ultra High Voltage (UHV) transmission project is to choose the external insulation distance, which requires a deep understanding of the long air gap discharge mechanism. The leader-streamer propagation is one of most important stages in long air gap discharge. In the conductor-tower lattice configuration, we have measured the voltage, the current on the high voltage side and the electric field in the gap. While the streamer in the leader-streamer system presented a conical or hyperboloid diffuse shape, the clear branch structure streamer in front of the leader was firstly observed by a high speed camera in the experiment. Besides, it is found that the leader velocity, width and injected charge for the branch type streamer are greater than those of a diffuse type. We propose that the phenomenon results from the high humidity, which was 15.5-16.5 g/m³ in our experiment.
- ultra high voltage,
- long air gap discharge,
- streamer,
- leader,
- restrike

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References (1)

References

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