Research on Optimization of Protection Level of 750 kV Station Surge Arrester

A study was conducted on the optimization of the protection level of lightning arresters for 750 kV system stations, and an overvoltage suppression optimization measure was proposed for line side lightning arresters with a rated voltage of 600 kV. The feasibility of using a rated voltage 600 kV lightning arrester on the 750 kV line side was analyzed. The rated voltage of the lightning arrester on the 750 kV system line side can be selected as 600 kV, and the existing rated voltage 600 kV lightning arrester can be directly used on the line side. Adjusting the rated voltage of the 750 kV line side lightning arrester from 648 kV to 600 kV can reduce the operating overvoltage level and help eliminate the closing resistance of the line circuit breaker within a certain length range.