500kV紧凑型线路带电作业用保护间隙

为减少线路走廊用地及增大输送容量，500kV紧凑型线路已在我国建设投运。由于塔头尺寸较小，使带电作业成为突出问题，需要研究新的带电作业方法对500kV紧凑型线路加装保护间隙的带电作业方式进行研究，采用真型塔试验研究及计算分析相结合的方法，研究保护间隙的结构及尺寸、作业方式、保护作用、保护范围等。研究结果表明加装保护间隙应用于500kV紧凑型线路带电作业是可行和安全的，保护间隙可起到控制放电路径和限制过电压幅值的作用，使带电作业的危险率显著降低。另外，当带电作业间隙对塔头尺寸起控制作用时，采用加装保护间隙的作用方式，不仅可提高作业的安全性，而且可减少塔头尺寸及造价，具有很大的经济效益。

Portable Protect Gaps for live work on 500 kV compact transmission lines

To decrease the hallway of the transmission lines and increase the transmission capacity,500kV compact transmission lines have already been set to work.Live working on500kV compact transmission lines becomes an outstanding problem because of the smaller size of the tower.So the new live working method needs to be researched.This paper presents result of research on Portable Protective Gaps for live working on500kV compact transmission lines,such as the construction,size,working method,the protection function and the protection scope etc.The research results show that the application of Portable Protective Gaps for live working on500kV compact transmission lines is reasonable and safe.It can control the flashover path and limit the amplitude of over-voltage,decrease the dangerous rate of live working obviously.Moreover,Portable Protective Gaps can not only increase the security of live working,but also reduce the size and cost of the tower.So it will play an important part in economy.