张奇星,李籽剑,张强.压缩气流灭弧条件下配网线路雷击跳闸率计算[J].电测与仪表,2022,59(7):64-71. zhang qi xing,li zi jian,zhang qiang.Calculation of Lightning Strike Tripping Rate of Distribution Line under Condition of CDPD[J].Electrical Measurement & Instrumentation,2022,59(7):64-71.
压缩气流灭弧条件下配网线路雷击跳闸率计算
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.
