When the surge voltage occurs, it will conduct quickly to limit the voltage amplitude to a certain value. This kind of device is used in parallel between the line and the reference ground. Under normal voltage, its impedance is very high, which has no effect on the operation of the circuit When a very high surge voltage is applied to it, its impedance becomes very low, bypassing the surge energy. A common characteristic of surge suppression devices is that the impedance is different with and without surge voltage. Therefore, the scheme of using ordinary filter and ferrite core to filter and absorb is basically invalid Gas discharge tubes, varistors, silicon transient voltage absorbing diodes, semiconductor discharge tubes and other special surge protection devices must be used. The biggest feature of lightning surge test is that the energy is particularly large.
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