长空气间隙放电通道的绝缘恢复特性

doi:10.19595/j.cnki.1000-6753.tces.191567

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摘要

输电线路因过电压引起间隙放电而跳闸后,放电通道的绝缘恢复对重合闸时间的整定具有重要的指导作用。该文在长空气间隙施加不同冲击电压,基于高速纹影技术,观测间隙耐受和间隙击穿时放电通道的绝缘恢复过程。试验结果表明：间隙耐受时,靠近电极的放电通道消散较快,并且形态类似“蘑菇云”,而远离电极的放电通道仅做径向扩张;间隙击穿时,通道演化形态类似“毛毛虫”,而且在放电通道弯曲处和分叉处,中心发光区域存在“瓶颈”现象。统计表明,间隙耐受时放电通道的绝缘恢复时间为5~25ms,且随着注入能量的增大,绝缘恢复时间呈对数增大;间隙击穿且自然风速约为2m/s时,正极性雷电冲击电压、正极性操作电压、负极性操作电压作用下放电通道的绝缘恢复时间分别为46.1~243.9ms、6.97~107.74ms和8.09~153.62ms。

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	刘晓鹏
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关键词 ：长空气间隙, 放电通道, 绝缘恢复, 形态演化, 纹影技术

Abstract：

After the transmission line trips due to gap discharge caused by overvoltage, the insulation recovery time of the discharge channel plays an important role in the setting of the reclosing time of the power system. Based on the Schlieren technique, the insulation recovery process of the discharge channel after withstanding and breakdown was observed under different impulse voltages. The test results show that when the gap withstands, the discharge channel near the electrode dissipates faster, and the evolution shape is similar to the “mushroom cloud”, while the discharge channel far away from the electrode only makes radial expansion; when the gap breaks down, the channel evolves like a “caterpillar”, and the discharge channel has a “bottleneck” phenomenon in the central illuminating area at the bend and bifurcation. The statistical results show that the insulation recovery time under different voltage levels is 5~25ms, and increases logarithmically with the increase of the injection energy when the gap withstands; when the gap breaks down and the natural wind speed is 2m/s, the insulation recovery time under the positive lightning impulse voltage, the positive switching impulse voltage and the negative switching impulse voltage with different voltage levels are 46.1~243.9ms, 6.97~107.74ms and 8.09~153.62ms, respectively.

Key words： Long air gaps discharge channel insulation recovery evolution shape Schlieren technique

收稿日期: 2019-11-19

PACS:

TM855

基金资助:

南方电网科技资助项目（ZBKJXM20180229）

通讯作者: 刘晓鹏男,1995年生,硕士研究生,研究方向为长空气间隙放电和介质恢复特性。E-mail: lxpeng@hust.edu.cn

作者简介: 赵贤根男,1989年生,博士,研究方向为长空气间隙放电机理和介质恢复特性。E-mail: zhaoxiangen@outlook.com

引用本文:

刘晓鹏, 赵贤根, 刘磊, 汪显康, 何俊佳. 长空气间隙放电通道的绝缘恢复特性[J]. 电工技术学报, 2021, 36(2): 380-387. Liu Xiaopeng, Zhao Xiangen, Liu Lei, Wang Xiankang, He Junjia. Characteristics of the Discharge Channel during the Relaxation Process in the Long Air Gap. Transactions of China Electrotechnical Society, 2021, 36(2): 380-387.

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