压缩气流灭弧条件下配网线路雷击跳闸率计算

压缩气流灭弧防雷间隙是一种冲击电弧诱导型灭弧防雷装置,它通过灭弧管道的特殊排列结构使得冲击电弧能够被优先吸引进入在压缩管道内并形成压力梯度产生自膨胀气流,在各个相邻灭弧管道拐点处粉碎性截断电弧直至电弧熄灭。为了计算在安装压缩气流灭弧防雷间隙后的雷击跳闸率,文中根据并联间隙与绝缘子串的放电电压分布特性得出了灭弧防雷装置的有效保护系数,通过数理统计的方法处理了试验数据,得出了安装压缩气流灭弧防雷间隙后配网线路上的建弧率,同时建立了压缩气流灭弧防雷间隙下的雷击跳闸计算模型。通过算例计算了某线路在安装灭弧装置前后的雷击跳闸率,通过数据分析可知安装压缩气流灭弧防雷间隙后有效降低了雷击跳闸率。

Calculation of Lightning Strike Tripping Rate of Distribution Line under Condition of CDPD

CDPD is an impact arc inducing arc extinguishing lightning protection device. Through the special arrangement structure of the arc extinguishing pipeline, the impact arc can be preferentially attracted into the compression pipeline and form a pressure gradient to generate a self-expansion air flow. Finally, the arc is comminuted at the inflection point of each adjacent arc extinguishing duct until the arc extinguishes. In order to calculate the lightning strike trip rate after the arc extinguishing and lightning protection gaps are installed, the effective protection factor of the arc extinguishing lightning protection device is first obtained based on the discharge voltage distribution characteristics of the parallel gap and the insulator string, and then processed by the mathematical statistics method. The experimental data shows the arc build-up rate on the distribution network after installation of compressed air flow arc extinguishing and lightning protection clearance, and at the same time, the calculation model of lightning stroke tripping under the arc extinguishing and lightning protection gap of compressed air is established. Finally, the lightning tripping rate before and after the arc extinguishing device is installed on a line is calculated through an example. Through data analysis, it can be seen that the installation of the compressed gas arc extinguishing and lightning protection gap effectively reduces the lightning strike trip rate.