摘要
针对当前输电线路故障开断重要原因的雷电绕击事故阐述了输电线路雷电屏蔽体系的构成、绕击发生的原因及绕击防护新措施的思路,提出了地线上加装水平侧向短针的绕击防治新措施。雷击模拟试验的研究结果表明,水平短针长度大于间隙的临界电晕半径时,该措施能显著防治绕击事故。根据长间隙放电理论、现场运行经验和模拟试验结果提出实际线路加装长度20cm或稍长的侧针,保护范围约6m。
Lightning shielding failure is still one of the important causes of transmission line fault interruption. The system of lightning shielding of transmission line, the reason of shielding failure and the protection measure are expounded. A new protection measure of lightning shielding of transmission line is presented, which overhead ground wire is equipped with short horizontal side needles. Through lightning simulation test, the study shows that, when the length of the needle exceeds the critical corona radius of the gap, the probability of shielding failure decreases obviously. Combining the discharge theory of long gap, the operation experience and the result of simulation test, when the length of the short horizontal side needle is 20 cm or above in operation, the protection zone is about 6 m.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2005年第7期37-38,41,共3页
High Voltage Engineering
关键词
输电线路
绕击
侧针
transmission line
lightning shielding failure
side needle
