一般意义上的过电压保护是对工频过电压保护的，工频过电压，往往产生在操作过程中，其电压波形的频率还是维持在50Ｚ。在对相地之间的过电压提供保护的同 时，又对相间过电压提供保护。

Overvoltage protection in general is to protect the power frequency over-voltage, the power frequency over-voltage is often generated in the operation process, the frequency of its voltage waveform is maintained at 50Z. The protection of interphase overvoltage is provided while protecting the overvoltage between phases.

避雷器是保护雷电过电压，这种过电压波形前端很陡，频率很高，但后续电流很小，避雷器可以将雷电波的峰值泄放，从而使后面的电气安全。

Lightning arrester is to protect the lightning over-voltage, this kind of over-voltage waveform is very steep at the front, the frequency is very high, but the follow-up current is very small, the arrester can discharge the peak value of the lightning wave, so that the back of the electrical safety.

避雷器是过压后短路泄放，

Lightning arrester is over-voltage, short-circuit leakage,

过压保护器是过电压分断保护

Overvoltage protector is overvoltage breaking protection

过电压保护器是在电压超过整定值后，保护器断开电源，起到保护作用。

The overvoltage protector is that the protector breaks off the power supply after the voltage exceeds the setting value, and plays a protective role.

避雷器在遇雷击时，直接将高电压大电流导入接地系统，并断开电源以避免电源因雷电产生的高压影响。

When lightning strikes a lightning arrester, the high voltage and high current are introduced into the grounding system directly, and the power is switched off to avoid the influence of the high voltage caused by the lightning.