换流站交流滤波器的暂态额定值计算用于配置适当的避雷器，以保护滤波器中的电抗器和电阻器设备，确定交流滤波器内各设备的绝缘水平和暂态冲击电流。以±800 kV锦屏—苏南特高压直流输电工程为例，介绍了交流滤波器暂态额定值的计算方法，包括避雷器选取的方案，电容、电抗、电阻等元件绝缘水平确定的原则，以及确定其他重要参数所需要的暂态电压和电流的计算方法，可为高压直流输电工程交流滤波器内电容器、电抗器、电阻器、避雷器和电流互感器等设备选择提供依据。

The transient rated calculation of AC filters in converter station is used to choose the suitable arresters for protecting the reactors and resistors in filter, also for determining the insulation levels and transient impulse currents of the devices in AC filters. Taking ±800 kV Jinping Sunan UHV DC Power Transmission Project as an example, the calculation methods of transient rating for AC filters are introduced in detail, including the schemes of arrester choosing, the determination principle of insulation levels for AC filters components (capacitance, reactance, resistance, etc.), as well as the calculation method of transient voltages and currents for other important parameters determination. The methods and parameters introduced are the important references for equipment selection, such as capacitors, reactors, resistors, arresters and current transformers in AC filters in HVDC power transmission project.