Lightning arrester, also known as Surge Protective Device (SPD), Surge Protector Device ), It is an electronic device that provides security protection for various electronic devices, instruments, and communication lines. When a surge current or voltage suddenly occurs in an electrical circuit or communication line due to external interference, SPD can conduct and divert in a very short time, thereby avoiding damage to other devices in the circuit caused by the surge.
Do lightning arresters need to be installed in the external distribution box of the charging station?
Answer: Usually not needed. For AC charging stations, there is an onboard lightning protection circuit; For DC charging stations, a separate lightning arrester is installed at the AC input end inside the charging station.
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The lightning arrester circuit is a single-phase parallel anti lightning surge circuit based on varistors and gas discharge tubes. It consists of a composite symmetrical circuit consisting of three varistors and one discharge tube, providing full protection for common mode and differential mode. The varistor MOV4 is connected in parallel with the power sources L and N, mainly to clamp the voltage between the L and N lines. The varistors MOV1 and MOV3 are connected in series with the discharge tube FDG1 and grounded. The series connection of MOV1 and FDG1 is mainly used to discharge the surge current on the N line, while the series connection of MOV3 and FDG1 is mainly used to discharge the surge current on the L line. When overvoltage occurs on the L/N line, the resistance of the varistor decreases, and the surge current is discharged to ground through the discharge tube FDG1 to protect the power supply from damage. When the pressure-sensitive short circuit fails, fuse F4 melts, disconnecting the short circuit circuit.
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