摘要
输电线路的雷击跳闸次数一般占线路总跳闸次数的50%以上。降低输电线路雷击跳闸率的主要措施之一是降低线路杆塔的冲击接地电阻,在高土壤电阻率地区,采用传统的方法难以使杆塔的冲击接地电阻满足要求。以石墨为主要原料而制成的接地模块,可有效地降低杆塔接地装置的工频接地电阻,尤其可大幅降低杆塔的冲击接地电阻,从而降低输电线路的雷击跳闸率。
The number of lightning-stroke trip-out in transmission line is usually above 50% in total number of lightningstroke trip-out.One of the main measure to reduce transmission line lightning-stroke trip-out rate is reducing impulse grounding resistance of line tower. In high resistance rate zone,Using traditional method is diffcult to let impulse grounding resistance meet requirement. The grounding module made up by graphite can efficiently reduce power frequency grounding resistance of twoers grounding device, especially reduce impulse grounding resistance of towers by a wide margin, Thereby reduce lightning-stroke trip-out rate of transmission line.
出处
《江西电力》
2006年第5期7-9,26,共4页
Jiangxi Electric Power
关键词
输电线路
雷击跳闸率
接地模块
接地电阻
冲击系数
transmission line
lightning-stroke trip-out rate
grounding module
grounding resistance
impulse factor
