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| Calculation of jump height for uneven ice-shedding of overhead transmission lines |
| ZHANG Yuzhuo1, JIANG Yue2, LI Xiaoting2, ZHOU Wenwu2, TAN Haowen2,ZHANG Xiaoli2, SUN Qing1 |
1.School of Human Settlements and Civil Engineering, Xian University, Xi’an 710054, China;
2.Northwest Electric Power Design Institute CO., Ltd., China Power Engineering Consulting Group, Xi’an 710075, China |
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Abstract Under the action of heating, natural wind or man-made external force, the icing of the transmission line will fall off in the whole span or at a part of one span, causing the transmission line to jump. This leads to accidents such as flashover between conductors or between conductors, line tripping, broken strands, and the collapse of transmission towers, which seriously threaten the safety of the power system. In this paper, referring to the actual 750kV transmission line project, a finite element model of continuous-span split conductors is established. Analyze the influence of the number of spans, span, height difference, ice thickness, wind speed, ice-shedding rate and insulator string length on the jump height caused by uniform and uneven ice-shedding of conductors. Discuss the relationship between the jump height caused by the two ice-shedding methods, and define the ice-shedding wire length in the case of uneven ice-shedding as the conversion span. Comparing the accuracy of the existing calculation formulas for the jump height of conductors, a jump height coefficient for uneven ice-shedding is proposed. The research shows that: when the ice-shedding load is the same, the jumping height of the conductor caused by uneven ice-shedding is greater; there is a certain proportional relationship between the jump height during uneven ice-shedding and the jump height of complete ice-shedding under the conversion span; obtain the calculation formulas of jump heights for uniform ice-shedding and uneven ice-shedding of conductors. The maximum relative error of the uniform ice-shedding jump height calculation formula proposed in this paper is 11.8%, and the relative error of the uneven ice-shedding jump height calculation formula is greater than 10% only accounts for 13.2% of the total number of results, which is a high calculation accuracy and helps to determine the phase ground or inter-phase safety gap when line design.
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Received: 19 May 2022
Published: 15 June 2023
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