摘要
110 kV燕江线大部分经过电阻率较高的山区,线路跳闸率高。通过燕江线2006年5月—2008年6月雷击故障统计,运用向量电气几何模型分析了雷击故障的原因,得出:高地势、大档距和大接地电阻是造成燕江线跳闸率偏高的三个主要原因。指出采用接地长度最长的放射状接地形式,结合GPF-94降阻剂可有效降低杆塔接地电阻;同时采取将绝缘子原来每串7片增加到每串8～9片,增加塔顶拉线及安装线路避雷器等防雷措施,以提高线路防雷水平。
The 110 kV Yan-jiang transmission line of Qinzhou Power Supply Bureau is situated in mountainous areas of the high earth-resistivity with a very high line trip rate. From statistics of strike failures of the 110kV Yan-jiang transmission line from May 2006 to June 2008, the causes of the lightning faults were analyzed with the vector electrical geometric model. The transmission line＇s high trip rate contributes to high altitude, long span and high grounding resistance. Utilizing the longest radial profile grounding combined with physical resistance-reducing agent can effectively reduce the tower＇s grounding resistance. Some available methods such as increasing the number of insulator string units from seven to 8-9 units, the pole top wire and installing line arresters to improve the line＇s ligh-ning protection level are recommended.
出处
《电瓷避雷器》
CAS
2008年第6期36-40,共5页
Insulators and Surge Arresters
关键词
跳闸率
接地电阻
向量电气几何模型
防雷措施
trip rate
grounding resistance
vector electrical geometric model
lightning protection
