Computer-base relaying samples the values of the current, voltage, and by use of A/D converters, change these analog values to digital form and then send them to the computer.

• 计算机继电保护可每秒进行多次电流、电压以及其它量的采样，通过A/D转换器将这些模拟量转变成数字量，然后送入计算机。