Method for Lightning Flashover Warning of Overhead Transmission Lines
Yu Zeng · Gao dianya jishu · 2013
Current lightning warning methods of overhead transmission lines are generally aiming at forecasting or warning the forthcoming lightning for a certain region,and they are not capable to forecast the flashover risk of transmission lines caused by lightning strikes.Therefore,we propose a method to realize lightning flashover warning of overhead transmission lines.The implementation procedure of the method is as follows.Using the information of lightning detection networks and satellite cloud pictures,the location and movement trend of thunder clouds are real-time monitored.The atmospheric electric field meters installed near the transmission lines are utilized to detect the distance between the thunder cloud and the lines.With that distance and the real-time lightning information from the lightning detection network,the lightning warning,lightning strike warning,and lightning flashover warning of transmission lines are started sequentially.The warning levels and risk degrees are given with regular intervals until the warnings are terminated.An example of some 220 kV line is presented to describe the warning process in detail.The proposed method considers more comprehensively in improving its warning accuracy and spatial precision,and the operability of its warning information is improved obviously,thus it has actual engineering application value.