Transactions of China Electrotechnical Society  2015, Vol. 30 Issue (18): 237-245    DOI:
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The Corona Characteristics of the Conductor Attached with Water Drops under AC Electrical Field
Hu Qin1, Wu Zhi2, Shu Lichun1, Jiang Xingliang1, Yang Shuang1, Xu Qingpeng1
1. State Key Laboratory of Power Transmission Equipment &
System Security and New Technology Chongqing University Chongqing 400044 China;
2. State Grid Chongqing Nan’an Power Supply Company Chongqing 400060 China

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Abstract  Conductor corona, which would bring huge impacts, is one of the significant factors that should be taken into account during design and operation of transmission line. However, rains are momentous to the corona characteristics of conductors. Combined with 2D and 3D Finite Element Simulations, AC corona test has been carried out with water drops adhered to its surface inside a small corona cage, to figure out the corona characteristics of the conductor. The result shows that: the first and foremost, the corona inception voltage of conductor with water drops is much lower than that of conductor with few drops. Besides, according to the burst types of the water droplets, the first breakup voltage and the minimum micro-drops jetting voltage are used to represent the stability degree of the drops in the electric field. The first breakup voltage and the minimum micro-drops jetting voltage, which were measured under the circumstance of conductor with three water droplets attached to its surface, are lower than those of one-drop-condition. Next, water droplets are forced to vibrate by twice the frequency of electric field under the AC electric field. And different vibration position of the water droplet means different distortion of the electric field. In this case, intermittent-period of corona occurs. Last but not the least, the result of 3D finite element simulation shows that the maximum space field distribution and the volume of high field intensity region of three-drops-conduct are greater than that in one-drop-condition. Therefore, it is indicated that the three-drop-condition has a more severe impact on electric field distortion.
Key wordsAC electric field      corona      water droplet      breakup      vibration      space field distribution     
Received: 20 January 2014      Published: 20 October 2015
PACS: TM852  
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Hu Qin
Wu Zhi
Shu Lichun
Jiang Xingliang
Yang Shuang
Xu Qingpeng
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Hu Qin,Wu Zhi,Shu Lichun等. The Corona Characteristics of the Conductor Attached with Water Drops under AC Electrical Field[J]. Transactions of China Electrotechnical Society, 2015, 30(18): 237-245.
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