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| Experimental Analysis on Corona Inception Voltage of Rod-Plane Air Gaps under DC and AC Composite Voltage |
| Zhang Jinglan1, Fu Yuke1, Lu Tiebing2, Qi Lei2, Bian Xingming2, Zhu Junyu1, Zhao Guoliang3, Wei Xiaoguang3 |
1. High Voltage and EMC Beijing Area Major Laboratory North China Electric Power University Beijing 102206 China;
2. State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China;
3. Global Energy Interconnection Research Institute Beijing 102200 China |
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Abstract In order to obtain the corona characteristics of electrodes under AC and DC composite voltage, the test platform with series circuit was established by using a stainless rod to plane electrode. Herein, one electrode was applied with positive DC voltage, and the other one was applied with AC voltage. The corona criterion was the change of ultraviolet photon counting. The characteristics of the corona inception voltage were studied under two different voltage-applying modes, two kinds of DC polarity and two different voltage-elevating methods for the electrodes. The influence of rod radius and air gap on corona inception voltage was also investigated. It was found that, in the same atmospheric conditions and electrode arrangement, because of the influence of space charge, the corona inception voltage under voltage-applying mode, where rod electrode with positive DC and plate electrode with AC, was higher than that under the inverse mode. In the range of rod-plate air gap of 0~5cm, by the voltage-elevating method of fixed DC component, the corona inception voltage, which was obtained by the sum of DC and AC effective components under the composite voltage, increased with the increase of the DC component and decreased with the increase of the AC component by the other voltage-elevating method of fixed AC component. And the relationship between AC and DC components was linear. The results lay a solid foundation for further studies on the corona mechanism of electrodes and the accurate prediction of corona inception voltage under composite voltage.
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Received: 14 October 2015
Published: 01 March 2017
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2017, Vol. 32 
