西北地区粉尘对绝缘子电场分布影响的数值模拟

Jia Guimin, Zhou Yuanxiang, Sui Jiang Yuan, Ma Xudong, Jiang Ling, Wang Shengfu
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引用次数: 0

摘要

特高压直流输电线路传输容量大,具有组网功能。在直流特高压线路中大规模使用绝缘子是保证输电线路安全稳定运行的重要组成部分。一旦发生污染闪络,损失将是巨大的。西北地区具有沙尘天气频繁、风速大的特点。在沙尘天气中,可能会发生污染闪蒸等事故,造成大规模停电和火车延误。针对上述问题,以新疆维吾尔自治区和青海省的沙尘环境为背景,研究了直流电场下沙尘对绝缘子电场分布的影响,建立了风沙环境下绝缘子运行特性的数值模拟模型,分析了风速、沙尘粒径和浓度。外围流场对复合绝缘子压力和电场分布的影响。研究发现,风沙对沿绝缘子的电场和电位分布有显著影响。在多尘环境下,绝缘子两端沿棚子处的电场仍最大,粒子带电使两端电场增大,中间棚子附近的场强畸变强度与洁净环境下相同位置相比,场强值变低;沙尘暴时高压端容易产生电弧,粉尘颗粒的增加可直接扭曲沿表面的场强;风速对绝缘子表面压力的影响是明显的。随着粒径和浓度的增大,其对表面压力的影响趋于稳定。严重的电场畸变会导致绝缘子的绝缘性能失效。因此,在电网运行过程中,有必要注意风沙对绝缘子电场变化的影响,防止由此引起的污染闪络。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical Simulation of Influence of Dust on Electric Field Distribution of Insulators in Northwest China
UHV DC transmission lines have large transmission capacity and have networking functions. Large-scale use of insulators in DC UHV lines is an significant part of ensuring the safe and stable operation of transmission lines. Once a pollution flashover occurs, the losses will be huge. The northwestern region has the characteristics of frequent sand and dust weather and high wind speed. In the sand and dust weather, pollution flashovers and other accidents may occur, causing large-scale blackouts and train delays. In response to the above problems, with the sand and dust environment in Xinjiang Uygur Autonomous Region and Qinghai province as the background, the impact of sand and dust on the electric field distribution of insulators under DC field was studied, and a numerical simulation model of insulator operating characteristics under wind and sand environment was established to analyze wind speed, particle size and concentration of sand dust. The influence of peripheral flow field on the pressure and electric field distribution of composite insulators. The study found that wind and sand have a significant impact on the electric field and potential distribution along the insulator. In a dusty environment, the electric field along the shed at both ends of the insulator is still the largest, and the particle charging makes the electric field at both ends increase, and the field strength distortion intensity near the middle shed Compared with the same position in a clean environment, the field strength value becomes lower; the arc is prone to occur at the high voltage end during sandstorm, and the increase of dust particles can directly distort the field strength along the surface; the effect of wind speed on the surface pressure of the insulator is obvious. With the increase of particle size and concentration, its effect on surface pressure tends to be stable. Severe electric field distortion may cause the insulation performance of insulators to fail. Therefore, it is necessary to pay attention to the influence of wind and sand on the electric field changes of insulators during power grid operation to prevent pollution flashover caused by this.
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