线路避雷器对雷击线路电磁暂态过程影响的分析与辨识
发布时间：2018-09-06 17:48
【摘要】：输电线路承担着输送电能的任务,线路走廊地形复杂、气候多变,雷电活动频繁,雷击故障造成输电线路故障占所有故障的40%～70%,且雷电绕击导线率高,行波故障测距装置已成为220kV及以上电压等级输电线路的标准配置。为了提高输电线路的耐雷水平,线路在经过重雷区、地势高处以及站端装设避雷器,但是国内外尚未查询到关于避雷器动作对雷击故障行波是否产生影响的分析研究,本文分析了线路避雷器动作对雷击线路电磁暂态过程的影响,并从单端行波信息中总结出去影响规律。从仿真雷电绕击导线、雷击塔顶、雷击避雷线档距中央三种情况下,再结合实测雷击故障数据研究分析了雷击闪络或未闪络线路避雷器动作对雷击故障行波的影响,得出不同位置的避雷器动作会使故障行波受到不同程度的影响。避雷器动作后时不仅雷击故障行波的波头幅值减小,还使初始行波的波头下降沿存在转折、突变或者后续存在振荡过程等特征,增加了单端行波测距对波头的识别难度。通过站端采集的波形形态也可判断出站端避雷器动作,还是沿线避雷器动作。对后期提高线路精确定位、雷击性质辨识与研究雷电流反演恢复奠定基础。依据避雷器动作对雷击行波影响特征,采用最小二乘拟合和相关系数分析、图像边缘检测方法结合马氏距离可实现采集到的行波有无避雷器动作影响的辨识;若有避雷器动作再用小波模极大值、HHT、Hough变换进行避雷器距闪络点的位置辨识。避雷器距闪络点较远时使波头后续呈现一个振荡过程,增加了单端测距对故障点反射波的辨识难度,通过采用music频率估计算法结合多分辨小波分解可屏蔽后续振荡的影响,有效地辨识出故障点反射波,即可确定避雷器的位置。确定动作避雷器的位置有利于后续对避雷器的运行维护及使用寿命估算。
[Abstract]:Transmission lines undertake the task of transmitting electric energy. The topography of the corridor is complex, the climate is changeable, the lightning activities are frequent, the lightning strike fault causes the transmission line fault to account for 40% of all the faults, and the lightning conductor rate is high. Traveling wave fault location device has become the standard configuration of 220kV and above voltage level transmission lines. In order to improve the lightning resistance level of transmission lines, the lines are installed with lightning arresters in heavy mined areas, high terrain and station ends. However, no research has been done at home and abroad on the impact of lightning arrester action on the lightning strike fault traveling wave. In this paper, the influence of lightning arrester action on the electromagnetic transient process of lightning strike line is analyzed, and the law of influence is summarized from the single terminal traveling wave information. In this paper, the influence of lightning flashover or non-flashover line action on the lightning strike fault wave is analyzed from the three conditions of simulating lightning wound conductor, lightning tower top and lightning strike line distance between the three cases, and combining with the measured lightning strike fault data, the lightning arrester action of lightning stroke flashover or non-flashover line is studied and analyzed. It is concluded that the action of arrester at different positions will affect the fault traveling wave to different extent. After the lightning arrester is operated, not only the amplitude of the wave head of the lightning strike fault traveling wave is reduced, but also the initial traveling wave's wave head falls along the turning point, the sudden change or the subsequent oscillation process, etc., which makes it more difficult to identify the wave head by single terminal traveling wave ranging. The action of lightning arrester or the action of lightning arrester along the line can also be determined by the waveform form collected at the station end. It lays a foundation for improving the accurate location of the line, identifying the lightning strike property and researching the restoration of the lightning current inversion in the later stage. According to the characteristics of lightning arrester action on lightning traveling wave, the least square fitting and correlation coefficient analysis are adopted, and the image edge detection method combined with Markov distance can be used to identify whether the lightning arrester action is affected by the collected traveling wave. The location of lightning arrester from the flashover point is identified by using the wavelet modulus maximum and HHT Hough transform if there is a lightning arrester action. When the lightning arrester is far away from the flashover point, the wave head presents an oscillating process, which makes it more difficult to identify the reflected wave of the fault point by single terminal location. The influence of subsequent oscillation can be shielded by using music frequency estimation algorithm combined with multi-resolution wavelet decomposition. The location of the arrester can be determined by effectively identifying the reflected wave at the fault point. Determining the location of the action arrester is beneficial to the operation maintenance and service life estimation of the arrester.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM863
[Abstract]:Transmission lines undertake the task of transmitting electric energy. The topography of the corridor is complex, the climate is changeable, the lightning activities are frequent, the lightning strike fault causes the transmission line fault to account for 40% of all the faults, and the lightning conductor rate is high. Traveling wave fault location device has become the standard configuration of 220kV and above voltage level transmission lines. In order to improve the lightning resistance level of transmission lines, the lines are installed with lightning arresters in heavy mined areas, high terrain and station ends. However, no research has been done at home and abroad on the impact of lightning arrester action on the lightning strike fault traveling wave. In this paper, the influence of lightning arrester action on the electromagnetic transient process of lightning strike line is analyzed, and the law of influence is summarized from the single terminal traveling wave information. In this paper, the influence of lightning flashover or non-flashover line action on the lightning strike fault wave is analyzed from the three conditions of simulating lightning wound conductor, lightning tower top and lightning strike line distance between the three cases, and combining with the measured lightning strike fault data, the lightning arrester action of lightning stroke flashover or non-flashover line is studied and analyzed. It is concluded that the action of arrester at different positions will affect the fault traveling wave to different extent. After the lightning arrester is operated, not only the amplitude of the wave head of the lightning strike fault traveling wave is reduced, but also the initial traveling wave's wave head falls along the turning point, the sudden change or the subsequent oscillation process, etc., which makes it more difficult to identify the wave head by single terminal traveling wave ranging. The action of lightning arrester or the action of lightning arrester along the line can also be determined by the waveform form collected at the station end. It lays a foundation for improving the accurate location of the line, identifying the lightning strike property and researching the restoration of the lightning current inversion in the later stage. According to the characteristics of lightning arrester action on lightning traveling wave, the least square fitting and correlation coefficient analysis are adopted, and the image edge detection method combined with Markov distance can be used to identify whether the lightning arrester action is affected by the collected traveling wave. The location of lightning arrester from the flashover point is identified by using the wavelet modulus maximum and HHT Hough transform if there is a lightning arrester action. When the lightning arrester is far away from the flashover point, the wave head presents an oscillating process, which makes it more difficult to identify the reflected wave of the fault point by single terminal location. The influence of subsequent oscillation can be shielded by using music frequency estimation algorithm combined with multi-resolution wavelet decomposition. The location of the arrester can be determined by effectively identifying the reflected wave at the fault point. Determining the location of the action arrester is beneficial to the operation maintenance and service life estimation of the arrester.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM863
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相关期刊论文 前10条
1 许飞;董新洲;王宾;施慎行;;考虑二次回路暂态传变特性的单端组合测距算法及其应用[J];中国电机工程学报;2015年20期
2 束洪春;曹璞t，
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