How to protect against electrical fast pulse (EFT) in a PCS energy storage system?

PCS protection against Electrical Fast Burst/B (EFT/B, IEC 61000-4-4) focuses on preventing rapidly rising burst interference from coupling into the system through power and signal lines. Protection strategies include:

1. Power Port Protection: Using common-mode inductors (such as the CMZ series) with Y capacitors at AC/DC power inputs to form a low-pass filter, attenuating high-frequency bursts. Ferrite rings can be connected in series on the power lines to enhance the effect.

2. Signal/Control Port Protection: Using common-mode chokes (such as the CML series) at communication and I/O ports to suppress common-mode interference, and combining them with transient voltage suppressor diodes (TVS) or ESD protection devices to absorb energy.

3. Good Grounding and Shielding: Providing a clean, low-impedance grounding reference point for the above filtering and protection devices. Proper grounding of the cabinet and cable shielding guides interference to the chassis.

4. Software Anti-interference: Adding watchdog timers, input signal debouncing, and error checking mechanisms to the MCU software as a supplement to hardware protection.