35 kV Overhead Transmission Line Lightning Strike Fault Analysis and Lightning Protection Research
In order to improve the lightning withstand level of 35 kV overhead transmission lines in Yucheng City,and to study the temperature rise and potential changes of lightning arresters after lightning strikes,this study focuses on typical lines and arrester models. First the electromagnetic transient calculation program EMTP-ATP is used to establish the cor-responding 35 kV transmission line model to calculate the lightning protection level of the line when the top of the trans-mission line tower or lightning protection line is struck by lightning,and analyze the impact of differentiated lightning pro-tection strategy on line lightning protection level. The influence of factors such as the erection of lightning protection wire,tower impulse grounding resistance and the selection of lightning arrester on the lightning resistance level of the line is analyzed. Then finite element simulation software is used to calculate the temperature rise and electric potential change of the arrester after lightning strike. The results show that the lightning protection level of 35 kV transmission lines can be improved by adopting the whole line of lightning protection lines,reducing grounding resistance of the tower,and in-stalling line lightning arresters. In addition,after a lightning strike,the arrester temperature shows a clear and stable up-ward trend,and electric potential and electric field show a rapid rise first and then a downward trend. Appropriately in-stalling lightning arresters has a more significant effect on improving lightning resistance and is more economical.
万方数据
维普
