220kV马墨线雷害事故分析及对策探讨

220 kV马墨线是韶关地区的一条骨干线路,自建成投产以来发生多起雷害事故.为此,对该线路现有防雷措施及具体雷害事故原因进行了分析,并就事故杆塔现有防雷措施参数对其耐雷水平进行计算,得出了该线路的雷害事故主要是雷击杆塔或避雷线引起的反击.在具体事故分析的基础上,针对现有防雷措施存在问题及不足,主要采取了降低杆塔接地电阻...

Analysis of the Lightning Accident of 220 kV Ma-mo Transmission Line and Counter Measures

220 kV Ma-mo transmission line is one of the key lines of shaoguan district,there have been many lightning accidents since the transmission line puts into operation.The author analyzes the existing lightning protection measures and the cause of lighting accident of Ma-mo 220kV transmission line and also calculates the lightning withstand level of the line using the existing parameter of the lightning protection measures of the accident tower.It is concluded that the lightning accident of the line is mainly caused by strike back of lightning strike on tower or lightning wire.Based on accident analysis,the transmission line has been reconstructed by decreasing grounding resistance of tower to avoid the defects and problems of the existing lightning protection measures.Because of the terrain of the tower is special,the traditional reduction resistance measures cannot reduce the grounding resistance to the theory value,the author analyzs SYJ type grounding device and designs the specifications of the device according to the target value.In addition,the author adopts installation of transmission line arrester and setting up coupling line as the supplementary measures for line reconstruction.After the measures mentioned in the paper were implemented,the lightning protection effect is better.