A TY-Type Clamp for Rapid Repair of Disconnected Downlead Conductors on Overhead Ground Wires in Ice-Melting Lines

DOI: https://doi.org/10.62517/jes.202502406

Author(s)

Mingzhen Lei*, Dejun Qin, Haifan Li

Affiliation(s)

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

Abstract

In recent years, the challenge of ice accumulation on power lines in southern China has been increasingly prominent due to frequent occurrences of extreme cold weather conditions. During the ice-melting process of the 500kV lines under the Southern Power Grid jurisdiction, there have been several instances of fuse blowing at the junctions between tower ground wires and NY-type clamps, particularly when the contact resistance between the downlead conductors and tension-resistant clamps is excessively high. This leads to a rapid temperature increase in the joint area due to Joule heating effects, resulting in interruptions in the ice-melting process and an expansion of ice formation along the transmission lines, posing a threat to the operational safety of tower equipment. Addressing the critical issues affecting the anti-icing capability of the power grid, and considering the high current intensity, concentrated operating time, and demanding conductive performance of the ice-melting process, a structurally optimized, superbly conductive, and conveniently installable TY-Type Clamp has been devised to replace the existing downlead line clamps and form an ice-melting line. By optimizing contact pressure and conductive area, this clamp markedly reduces contact resistance, effectively suppressing localized overheating during ice-melting, achieving the objective of swift repairs for disconnected downlead conductors on overhead ground wires in ice-melting lines. It furnishes a reliable technical solution for rapidly restoring ice-melting operations and preventing accidents from escalating during ice accumulation periods, holding vital engineering significance in enhancing the power grid's resilience against ice disasters.

Keywords

Transmission Lines; Ice-Melting; Rapid Repair of Downlead Conductors; TY-type Clamps

References

[1] Pan Hao, Zhou Fangrong, Geng Hao, et al. Calculation method for ice-melting current and ice-melting time of double-conductor heating ground wire. Smart Power, 2025, 53(03): 62-68. [2] Hu Yu. Research on ice coating and melting risk analysis and improvement scheme of Zhaotong power grid transmission lines. Kunming University of Science and Technology, 2021. [3] Li Xiaoyan, Yao Guijiao, He Mingxia, et al. Development of crimped ground wire current-carrying clamp. Mechanical and Electrical Information, 2018, (30): 128-129. [4] Li Ronghao. Transmission line ice coating thickness early warning system based on IDBO-LSSVM. Anhui University of Science and Technology, 2025. [5] Liu Jie. Research and application of full-process prediction method for ice coating on overhead transmission lines. Rural Electrification, 2025, (04): 46-49. [6] Lei Mingzhen, Zhang Yuan, Xu Wentao. Research on ice-melting technology for ground wire of high-voltage transmission lines. Automation Application, 2023, 64(20): 127-129. [7] Fang Yili, Gu Li, Li Qi, et al. Design and analysis of automatic wiring device for ground wire ice melting. Mechanical and Electrical Information, 2016, (27): 98-99. [8] Chen Zusheng. Brief analysis on optimization and transformation method of fitting connection in ground wire ice-melting section. Telecom World, 2015, (11): 170-171. [9] Wang Junhao, Yan Kun, Zhao Pinxian, et al. An auxiliary insulation device for live connection of section drainage wire. Electrical Engineering, 2022, (16): 97-98+101. [10] Tong Yang, Hu Jie. Analysis on fracture problems of four types of compression-type clamps and research on prevention strategies. Hydropower and New Energy, 2021, 35(09): 52-55. [11] Luo Yixin. Analysis on grip force composition and research on detection method of compression-type strain clamp. North China Electric Power University, 2024.