Study on Application of Line Lightning Arrester on 110 kV Xuan-Shi Transmission Line

With an example of 110 kV Xuan-Shi transmission line of Lu-Zhou,it is detailed on how to select the ZnO arrester erecting position to improve the lightning withstanding level of transmission line.First,we should identify the need to focus on the protection area by analyzing the tower line parameters and the terrain.Second.through theoretical analysis and electromagnetic transient simulation,we could compare the lightning protection effects of different methods of installation arresters.Impact of impulse grounding resistance on lightning withstand level and the absorbed discharge energy of lines lightning arresters was analyzed in this paper,in this way the required ZnO arrester parameters were determined.Though the 110 kV Xuan-Shi lightning withstand level of transmission line simulation calculation,the lightning withstand level of tower,most likely subjected to thunder strike,can be increased from 76 kA to 410 kA.Therefore,installation of reasonable line arrester at specific line sections can significantly increase the lightning withstand level of transmission line.