Research on Influence of Line Arrester on UHV DC System Protection

When the Ultra High Voltage Direct Current (UHV DC) line is struck by lightning, it may cause the protection action of the DC system. In this paper, a simulation analysis model of the lightning transient process of UHV DC line is established, and the influence of the line arrester and its installation position and quantity on the protection action is systematically studied. The research results show that line arresters can reduce the impact of lightning overvoltage on UHV DC system protection and prevent lightning strikes from causing DC system protection under certain conditions. The more line arresters are installed along the line, the more significant the effect.