The low-frequency transmission system has significant technical and economic advantages in offshore wind power transmission and other applications, and it is necessary to develop low-frequency arresters and other equipment based on the impact of frequency and engineering practice. Based on the 220 kV low-frequency transmission project in Hangzhou, research has been conducted on the key performance and parameters of arresters under low-frequency voltage, including aging resistance, voltage distribution, rated voltage, protection level, and operating duty. It is proposed that arresters under low-frequency voltage have better aging resistance; The voltage distribution performance of arresters under low-frequency voltage is better than that of power frequency arresters; The recommended rated voltage of the 220 kV arrester is 192 kV, and the protection level of the arrester can be optimized by more than 10% compared to conventional arresters; An equivalence test method for low-frequency arrester operating duty using a power frequency power supply was proposed, and experimental operating duty test research was conducted, resulting in the development of a low-frequency arrester.