避雷器安装方案对线路耐雷性能的影响研究
Influence of Arrester Installation Scheme on Line Lightning Protection Performance
-
摘要:
雷击跳闸是输电线路总故障跳闸的主要原因，安装线路避雷器是防止线路雷击跳闸的有效措施。为降低线路雷击跳闸率，提高线路安全性，利用电磁暂态计算程序(ATP-EMTP)，采用绝缘子串和空气间隙先导法、修正电气几何法对一条500 kV单回线路未加装线路避雷器时的反击性能和绕击性能进行了仿真建模计算，对影响因素进行了分析，提出了避雷器的安装原则，对不同安装方案进行了对比研究。研究表明，线路避雷器可以有效提升线路的防雷性能，对水平布置的单回线路，防止反击时避雷器应重点安装在较高呼高、冲击接地电阻较大的杆塔两边相导线上，防止绕击时应重点安装在较高呼高、较大地面倾角时的下坡侧边相导线上。研究成果有助于指导线路避雷器安装的选点和设计工作。 Abstract:Use of surge arrester is an effective measure to prevent the transmission line from lightning trip which is mostly caused by lightning strike. In order to reduce the lightning trip rate and improve the operation safety, the performance against shielding failure and back striking of a 500 kV single circuit line without a line surge arrester are simulated by ATP-EMTP In this paper. The influencing factors of the performance are analyzed, the installation principle of lightning arrester is put forward, and thus a comparative study of different installation schemes is carried out. The research shows that the surge arrester can effectively improve the lightning protection performance of the line. For the horizontal wire arrangement of single circuit, arrester should install at higher towers of more impulse grounding resistance on both sides of the phase conductors to prevent back striking, while of large ground obliquity on downhill side phase conductors to prevent the shielding failure. The research results are helpful to guide the line arrester installation location and design work.
下载:
