额定电压是表征避雷器特性的一个重要参数，并通过动作负载试验的验证。通常，避雷器的额定电压取安装处的工频暂时过电压，在500kV和750kV变电站，线路侧按1.4p.u.、母线侧按1.3p.u.选取。对于1000kV特高压工程，为了进一步降低系统过电压水平，采用断路器联动方式，使线路侧工频暂时过电压的持续时间缩短到0.2s，同时鉴于特高压避雷器具有良好的工频耐受特性，因此在1000kV特高压工程中避雷器额定电压的选取突破了传统的选择原则，线路侧避雷器的额定电压选用与母线侧避雷器相同的值，即828kV。
The rated voltage is an important parameter to characterize the characteristics of arrester, and it is verified by the action load test. Usually, the rated voltage of the arrester is taken as the power frequency temporary overvoltage at the installation site. In 500 kV and 750 kV substations, the line side is selected as 1.4 p.u., and the bus side is selected as 1.3 p.u. For 1000 kV UHV project, in order to further reduce the overvoltage level of the system, circuit breaker linkage is adopted to shorten the duration of temporary overvoltage of line side power frequency to 0.2s. At the same time, considering that UHV arrester has good power frequency tolerance characteristics, the selection of rated voltage of arrester in 1000 kV UHV project breaks through the traditional selection principle, line side arrester. The rated voltage is 828kV, which is the same value as the busbar arrester.