How to suppress EPS lightning-induced overvoltage?

To suppress transient overvoltages induced in long cables (such as power lines and signal lines) by nearby lightning strikes, EPS systems require multi-layered protection:

1. Port SPD installation: Install appropriate surge protection devices at the power and signal line entrances. For example, use MOV (such as the 14D series) or GDT for power lines, and low-capacitance TVS diodes or semiconductor discharge tubes (TSS) for signal lines.

2. Good shielding and grounding: Use shielding for all incoming and outgoing cables and ground them at both ends to provide a low-impedance shielding return path for induced currents, reducing the energy coupled into the core wires. The cabinet itself should also be well grounded.

3. Line filtering: After the SPD, use filters such as common-mode inductors to further attenuate high-frequency oscillation components that are not completely absorbed by the SPD.

4. Secondary protection for internal circuits: Add low-power TVS or filter circuits to the power and signal pins of critical chips as a last line of defense.

5. Use isolated interfaces: Use isolated transceivers for long-distance communication to cut off the overvoltage path caused by ground potential differences.