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Corona Onset Characteristics of Bundle Conductors in UHV AC Power Lines at 2200 m Altitude

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Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense, North China Electric Power University, No. 619 North of Yonghua Street, Baoding 071003, China
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State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, No. 2 Beinong Road, Beijing 10206, China
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State Grid Hebei Maintenance Branch, No. 98 Fuqiang Road, Shijiazhuang 050070, China
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State Grid Xinjiang Electric Power Research Institute, No. 33 Changchun Middle Road, Wulumuqi 830001, China
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Authors to whom correspondence should be addressed.
Energies 2018, 11(5), 1047; https://doi.org/10.3390/en11051047
Received: 7 April 2018 / Revised: 19 April 2018 / Accepted: 19 April 2018 / Published: 25 April 2018
(This article belongs to the Section Electrical Power and Energy System)
The corona onset characteristic of bundle conductors is an important limiting factor for the design of UHV AC power lines in high-altitude areas. An experimental study on the corona characteristics of 8 × LGJ630, 6 × LGJ720, 8 × LGJ720 and 10 × LGJ720 bundle conductors commonly used in UHV power lines under dry and wet conductor conditions, as well as artificial moderate and heavy rain conditions, was conducted in Ping’an County, Xining City (elevation 2200 m). By using the tangent line method, the corona onset voltages and onset electric field of four types of conductors at high altitudes are obtained for the first time. In addition, the calculation model of corona onset voltage considering the outer strands’ effect on the electric field and the geometric factor in the corona cage in high altitude areas is established. The comparison of the calculation results and experimental results under dry conditions verifies the model’s correctness. Based on the results, an optimal selection scheme for high altitudes is proposed. The roughness coefficient was also calculated and analysed: the roughness coefficient of bundled conductors was between 0.59 and 0.77, and the roughness coefficient of the wet conductor was between the dry and rainy conditions. Both the experimental data and the calculation model can provide a reference for conductor selection for UHV AC power lines for use in high-altitude areas. View Full-Text
Keywords: UHV AC (Ultra-High-Voltage Alternative Current) power lines; corona onset characteristic; high altitude; calculation model considering outer strands UHV AC (Ultra-High-Voltage Alternative Current) power lines; corona onset characteristic; high altitude; calculation model considering outer strands
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Huang, S.; Liu, Y.; Chen, S.; Zhou, G.; Zhuang, W. Corona Onset Characteristics of Bundle Conductors in UHV AC Power Lines at 2200 m Altitude. Energies 2018, 11, 1047.

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