超高压输电线路复合绝缘子不同位置缺陷下发热特性研究
CSTR:
作者:
作者单位:

(1.国网湖南超高压输电公司,湖南 长沙 410000;2.带电巡检与智能作业技术国网公司实验室,湖南 长沙 410004;3.长沙理工大学电气与信息工程学院,湖南 长沙 410114)

通讯作者:

刘冬雄(1997—),男,硕士研究生,主要从事高电压与绝缘技术的研究;E?mail:liudongx97@163.com

中图分类号:

TM85

基金项目:

湖南省自然科学基金(2021JJ40604);湖南省教育厅科学研究项目(20C0047)


Study on heating characteristics of composite insulators in EHV transmission lines under different position defects
Author:
Affiliation:

(1.State Grid Hunan EHV Transmission Company, Changsha 410000,China;2.Live Inspection and Intelligent Operation Technology State Grid Corporation Laboratory,Changsha 410004,China;3.Changsha University of Science and Technology, Changsha 410114, China)

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    摘要:

    复合绝缘子具有质量轻、机械性能好等特点,其在超特高压输电线路中的应用越来越广泛,但随着使用年限的增加,复合绝缘子容易由于隐蔽性缺陷而发热,最终造成严重的影响。本文建立真型500 kV输电线路复合绝缘子多物理场有限元模型,研究其在高压端、低压端和中间位置存在导通性故障时的电场和温度场分布。结果表明,当存在导通性故障时,绝缘子串电场和热场均产生了较大的变化。高压端、低压端和中间位置分别设置导通性故障时,绝缘子伞裙尖端最大电场分别可达17.45 、15.95、5.62 kV/cm,温升分别可达9.3、4.4、1.8 ℃,最大温升比正常工况下的温升增加了10.6倍。此外,当存在导通性故障时,沿绝缘交界面的温度分布各有特点,例如,中端故障时,其中端存在2个明显的温度峰值。最后,进行现场的红外热像测试试验,验证试验结果与仿真结果具有很好的一致性。

    Abstract:

    Composite insulators are increasingly employed in EHV/UHV transmission lines due to their light weight and excellent mechanical properties. However, with prolonged service life, composite insulators are susceptible to hidden defects and heating, leading to serious consequences. In this paper, the multiphysical field finite element model for real?size 500 kV transmission line composite insulators is established, and the distribution of electric field and temperature field under conductive faults at high voltage end, low voltage end and middle position are calculated. The research findings yield the following conclusions: There are substantial changes in the electric field and thermal field of the insulator strings under conductive faults. Specifically, when conductive faults are introduced at the high?voltage end, low?voltage end and middle position, the maximum electric field at the tip of insulator umbrella skirt can reach 17.45, 15.95 and 5.62 kV/cm respectively, and the corresponding temperature rise can reach 9.3, 4.4 and 1.8 ℃ respectively, representing a maximum temperature rise 10.6 times higher than that under normal working conditions. In addition, the temperature distribution along the insulation interface exhibits distinctive characteristics under conductive fault conditions at different positions. For example, in the case of a fault at the middle end, two obvious temperature peaks are observed. Finally, an infrared thermal image test is carried out, and the results are in good agreement with the simulations presented in this paper.

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李 稳,李化旭,杨 力,等.超高压输电线路复合绝缘子不同位置缺陷下发热特性研究[J].电力科学与技术学报,2023,38(5):246-252.
LI Wen, LI Huaxu, YANG Li, et al. Study on heating characteristics of composite insulators in EHV transmission lines under different position defects[J]. Journal of Electric Power Science and Technology,2023,38(5):246-252.

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