输电线路带固定间隙避雷器动作次数计算新方法

A New Method for Calculating the Operation Times of Lightning Arresters with Fixed Clearance on Transmission Lines

避雷器计数器的动作次数是判断避雷器运行状况的主要依据之一,但人工和无人机航拍读取避雷器动作次数不仅实施难度大,且部分数据无法获取。文中提出一种根据雷电定位系统、输电线路设备台账数据与防雷机理相结合的带固定间隙避雷器动作次数计算的新方法,并通过实际算例对该方法的有效性进行验证。首先,由输电线路与雷电流参数确定线路的引雷区,并根据避雷器安装时间和雷电定位系统历年数据统计引雷区的所有雷电流;然后,利用规程法计算该线路的反击耐雷水平,根据改进电气几何模型计算该线路的最大、最小绕击雷电流值和雷电绕击率;最后,通过分析反击雷与绕击雷致闪络个数来计算出带固定间隙避雷器的动作次数。实例验证表明,该新方法计算的动作次数与实际动作次数基本相吻合,能有效地计算反击雷致避雷器动作的次数与绕击雷致避雷器动作次数的概率。

The operation times of arrester counter is one of the main indexes for judging the operation status of arrester.It is very difficult to calculate the operation times of arrester through the artificial and unmanned aerial photographs.So a new method was proposed to calculate the number of actions of arrester with fixed clearance based on the data of lightning location system,transmission line equipment account and lightning protection mechanism.The effectiveness of the method was verified by a practical example.Firstly,lightning-induced area of the line was determined by the parameters of transmission line and lightning current,and all lightning currents in lightning-induced area were calculated according to the installation time of lightning arresters and the data of lightning positioning system over the years.Then,the lightning resistance level of the line was calculated with method of regulations,and the maximum and minimum lightning current value and lightning shielding rate of the line were calculated based on the improved electrical geometric model.Finally,the operation times of arrester with fixed clearance was calculated by analyzing the number of flashover caused by counterattack lightning and encircling lightning.The case study shows that the operation times calculated by this new method are basically consistent with the actual operation times,and it can effectively calculate the probability of action times of arrester caused by counterattack lightning and encircling lightning.