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| Study on Leakage Current Characteristics of Conductor-Plane Short Air Gap under Vegetation Fire Condition |
| Huang Daochun1, Lu Wei1, Yao Tao2, Xia Jun1, Quan Wanlin1 |
1. School of Electrical Engineering and Automation Wuhan University Wuhan 430072 China;
2. State Key Laboratory of Power Grid Environmental Protection China Electric Power Research Institute Wuhan 430074 China |
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Abstract In order to study the leakage current characteristics of air gaps and its effect on gap discharge characteristics under flame condition, the discharge experiments of 45cm conductor-plane gap under different vegetation flames were carried out. The process of charge generation in vegetation flames was analyzed, the leakage current characteristics and the discharge voltages of the gap were discussed at the same time. The leakage current characteristics of the gap under vegetation flame with different combustion intensities were compared. The results show that under 12kV positive DC voltage, the leakage current peak value of the gap under fir branch flame is 27mA, and the straw flame is only 8.3mA; the breakdown voltage of the gap under the fir branch flame is about 44% of that under the straw flame condition. There is an obvious polarity effect of the leakage current under the condition of flame, and the leakage current under positive voltage is larger than that under negative polarity. When the burning intensity of vegetation in the gap increases, the gap breakdown voltage decreases significantly, and a relatively stable leakage current has been formed in the gap before the gap breakdown.
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Received: 13 November 2018
Published: 02 September 2019
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2019, Vol. 34 
