Transactions of China Electrotechnical Society  2024, Vol. 39 Issue (9): 2916-2924    DOI: 10.19595/j.cnki.1000-6753.tces.230088
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The Impact of Ice Accumulation Shape on the DC High Current Ice-Melting Time for a Single Conductor on Power Transmission Line
Yang Guolin, Jiang Xingliang, Wang Maozheng, Hu Jianlin, Zhang Zhijin
Xuefeng Mountain Energy Equipment Safety National Observation and Research Station Chongqing University Chongqing 400044 China

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Abstract  In winter, the icing of transmission lines has emerged as a significant threat to power grid safety. Scholars have diligently researched and developed numerous de-icing methods, categorizing them based on their working principles into mechanical, thermal melt-icing, passive, and other methods. Despite these alternatives, DC high current melt-icing technology remains the preferred choice for transmission line de-icing. This study focuses on the actual operating conditions of single wire icing shapes on transmission lines, using three wire types (LGJ-240/30, LGJ-300/50, and LGJ-400/35) to calculate and analyze the DC high current melt-icing time for both circular and wing-shaped ice.
Under the same wire type, an increase in melt-icing current density leads to a shorter melt-icing time for circular ice. For instance, when the current density increased from 1.5 A/mm² to 3 A/mm², the melt-icing time for circular ice decreased by 21.78%, 22.13%, and 22.55% for the three wire types. Similarly, with the same melt-icing current density, a larger wire cross-section results in a shorter circular ice melt-icing time. Comparing wire types from LGJ-240/30 to LGJ-400/35, the latter's melt-icing time was 70.73%, 72.26%, and 73.25% of the former across the three current densities.
The impact of melt-icing current density on circular ice melt-icing time is more significant than the wire type under the same ice-covered environment. The pattern of melt-icing time variation with current density and wire type for wing-shaped ice mirrors that of circular ice, but numerically, the melt-icing time for wing-shaped ice is notably smaller. The ratio β, representing the wing-shaped ice melt-icing time to circular ice melt-icing time, ranges from 9.27% to 11.55%, with an average of 10.49%. In natural DC high-current melt-icing, LGJ-300/50 wire's wing-shaped ice melt-icing time was 10.6% of the circular ice melt-icing time, and for LGJ-400/35 wire, it was 8.3%. Consequently, the paper suggests inhibiting circular ice formation to promote wing-shaped ice growth as a means to reduce DC high current melt-icing time and decrease energy consumption.
Key wordsPower transmission lines      circular ice      wing-shaped ice      ice-melting time      DC high current     
Received: 18 January 2023     
PACS: TM85  
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Yang Guolin
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Yang Guolin,Jiang Xingliang,Wang Maozheng等. The Impact of Ice Accumulation Shape on the DC High Current Ice-Melting Time for a Single Conductor on Power Transmission Line[J]. Transactions of China Electrotechnical Society, 2024, 39(9): 2916-2924.
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