Calculation method of lightning trip-out rate of transmission line under jet stream arc-extinguishing condition

Jet stream arc-extinguishing lightning protection gap (JSALPG) is an initiative arc-extinguishing lightning protection method aiming at suppressing insulator arc-establishing. In order to calculate the lightning trip-out rate under jet stream arc-extinguishing (JSA) condition, firstly, we acquired an approximate ideal arc-establishing coefficient (about 0.02) and the arc-establishing rate formula under JSA condition by experimental statistics and probability analysis. Secondly, we established the calculation models of lightning trip-out rate under JSA condition by using the regulations method. Finally, we selected a typical example of 35 kV line for verification. The theoretical calculation results show that the annual average lightning trip-out rate at plain and mountainous area of this line have dropped to 0.380 8 and 0.384 2 times/(100 km·a), respectively, and the drop ratios are 95.53% and 96.06% respectively. The practical operation results show that the above two factors have dropped to 0.530 3 and 0.564 1 times/ (100 km·a), respectively and the drop ratios are 93.78% and 94.21%, respectively. The results above preliminarily verify that the validation of theoretical calculation method and the operation effect of JSALPG. ©, 2015, Gaodianya Jishu/High Voltage Engineering. All right reserved.