The Function And Installation Points Of Secondary Surge Protector

Or when the power transmission line is struck by direct lightning, the huge energy conducted will be discharged. At the junction of each zone (including LPZ1 zone) after the first protection zone, a voltage limiting type surge protective device is installed as a second, third or higher level protection. The second level surge protector is a protective device for the residual voltage of the previous level surge protection device and the induced lightning strike in the zone.

Parameters of SPD and its working principle.

(1) Maximum continuous withstand voltage Uc (rms) refers to the maximum AC voltage or DC voltage that can be continuously applied to the SPD.

(2) Residual voltage Ur refers to the residual voltage value at the rated discharge current In.