Humidity effects on the ground-level resultant electric field of positive DC conductors

Haibing LI (李海冰); Jie ZHU (朱杰); Wei YANG (杨威); Xu ZHANG (张旭); Donglai WANG (王东来); Junyu ZHU (朱俊谕); Xingming BIAN (卞星明)

doi:10.1088/2058-6272/ab0a3f

Plasma Science and Technology > 2019 > 21(7): 74001-074001. > DOI: 10.1088/2058-6272/ab0a3f

Haibing LI (李海冰), Jie ZHU (朱杰), Wei YANG (杨威), Xu ZHANG (张旭), Donglai WANG (王东来), Junyu ZHU (朱俊谕), Xingming BIAN (卞星明). Humidity effects on the ground-level resultant electric field of positive DC conductors[J]. Plasma Science and Technology, 2019, 21(7): 74001-074001. DOI: 10.1088/2058-6272/ab0a3f

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Humidity effects on the ground-level resultant electric field of positive DC conductors

¹ State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, People’s Republic of China
² State Key Laboratory of Advanced Transmission Technology, Global Energy Interconnection Research Institute, Beijing 102211, People’s Republic of China
³ State Grid Suzhou Electric Power Supply Company, Suzhou 215008, People’s Republic of China

Funds: This work was supported by National Key Research and Development Program of China Grant No. 2016YFB0900800, Fok Ying-Tong Education Foundation China Grant No. 151058, the State Key Laboratory of Advanced Power Transmission Technology Grant No. GEIRI-SKL-2018-014, the Fundamental Research Funds for the Central Universities Grant No. 2019MS011 and Young Elite Scientists Sponsership Program by CAST Grant No. 2016QNRC001.

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Received Date: November 06, 2018

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Abstract

Abstract

The effects of humidity on the ground-level resultant electric field around positive DC conductors were studied both experimentally and numerically. Experiments were carried out in an artificial climate chamber, the results of which showed that the photon count and the groundlevel resultant electric field strength both increased with increasing relative humidity. Numerical calculations for different values of relative humidity were carried out, including solutions of the positive corona inception voltage and the ion-flow field, for which a photoionization model and the upstream finite element method were employed, respectively. In order to analyze the effects of humidity, three main factors were considered: the ionization coefficient, the attachment coefficient in the photoionization model and the modified ion mobility of the charged water particles. The results indicated that, with increasing relative humidity, increasing values of the effective ionization coefficient were responsible for a reduction in the inception voltage, and the reduction reinforced the ground-level resultant electric field. Moreover, due to the charged water particles and the lower ion mobility with increasing relative humidity, the space charge density distribution was enhanced, which also strengthened the ground-level resultant electric field.
- corona discharge,
- humidity,
- electric field

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References

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