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Adjustable Method and Implementing Device for Direct Current Ice-Melting Discharge Clearances

Author(s)

Mingzhen Lei*, Dejun Qin, Wei Zhang

Affiliation(s)

Liuzhou Bureau of Ultra-high Voltage Transmission Company of China Southern Power Grid Co., Ltd., Liuzhou, Guangxi, China *Corresponding Author

Abstract

In response to the significant threat of ice damage faced by power transmission lines during ice-melting periods, traditional adjustments of discharge clearances in the direct current ice-melting process often rely on manual tower climbing operations. This approach not only suffers from low efficiency and high safety risks but also struggles to meet the rapid response requirements under complex meteorological conditions. To address these challenges, this paper introduces a method and complementary implementing device for adjusting discharge clearances in direct current ice-melting processes. The device achieves this by reliably serially connecting the downlead conductors on both sides of the pole through specialized downlead conductor clamps and integrating a remotely controllable automatic knife switch, constructing an electrically isolated discharge clearance adjustment mechanism. During lightning protection period, the remote control device at the base of the tower closes the electric knife switch to establish an electrical pathway. As the ice-melting period commences, the same remote control system remotely opens the knife switch, facilitating flexible adjustment of ice-melting clearances. This method effectively replaces the traditional manual tower climbing short-circuit method, significantly improving operational convenience and response speed. Real-world operational results demonstrate that this device can swiftly, efficiently, and safely complete the task of adjusting discharge clearances, markedly enhancing the overall efficiency of direct current ice-melting operations. Furthermore, it enhances dielectric reliability, ensures the safety of operators, and offers new technical support for ice disaster prevention in power transmission lines.

Keywords

Discharge Clearances; Electric Knife Switch; Remote Control Device; Power Transmission Line Safety

References

[1]Gong Qingwu, Feng Ruifa, Li Wei, et al. Location Method for Lightning Striking OPGW Based on the State of Polarization of Light. High Voltage Engineering, 2016, 42(2): 612-618. [2]Jiang Xingliang, Meng Zhigao, Zhang Zhijin, et al. Critical Ice-Melting Current of Ice-Covered OPGW and Its Impacting Factors. Transactions of China Electrotechnical Society, 2016, 31(9): 174-180. [3]Qi Zheng, Rao Zhi, Yang Linlin. Research of current distribution between OPGWs in overhead transmission system with grounding fault at any point. Power System Protection and Control, 2016, 44(2): 86-94. [4]Zhang Yunpeng, Ji Tian, Wei Huayong. Analysis and Calculation of Fault Current for Optical-fiber Composite Overhead Ground Wire in Power System Fault of Complex Transmission Line. Automation of Electric Power Systems, 2015, 39(16): 132-137. [5]Huang Shuangde, Kuang Sicong, Li Xinjiang. Development of Measuring Tool for Arc Angle Discharge Gap of Deicing Ground Wires of Transmission Lines. Electric Engineering Technology, 2024(11): 117-119. DOI: 10.19768/j.cnki.dgjs.2024.11.028. [6]Wang Lei, Sun Peng, Ma Yutang, et al. Theoretical Analysis on Effect of Ground Wire Insulation on Lightning Protection Performance of 500 kV Weiganjia Transmission Line. High Voltage Apparatus, 2014, 50(9): 76-81. [7]Huang Xiuqian, Qiu Ping, Fu Yufeng, Zhao Chun, Ren Hua, Lei Mengfei. Research on Lightning Protection Performance and Renovation Scheme of a Typical 500 kV Ground Wire Insulated Transmission Line. Smart Grid, 2015, 3(8): 744-748. [8]Hao Xiapeng, Zhang Yaoqiang, Miao Dong, et al. Research on the application of sectional fixed DC ground wires de-icing method for 500 kV transmission lines. Electrotechnical Application, 2025, 44(04): 126-131. DOI: CNKI: SUN: DGJZ.0.2025-04-017. [9]Fu Chuanyue, Liao Weixing, Huang Kaimin, et al. Research Progress on Motor Operating Mechanism of High Voltage Switchgear. Science &Technology Vision, 2024, 14(25): 110-116. DOI: CNKI: SUN: KJSJ.0.2024-25-029. [10]Liu Xianbao, Lyu Bin. Study on Factors Affecting the Motion Process of Indoor High Voltage Isolation Switch Mechanism. China Electrical Equipment Industry, 2024, (01): 32-38. DOI: CNKI: SUN: DQGY.0.2024-01-009.