How should the PCSSPD of an energy storage system be coordinated with EMC grounding?

Surge protectors (SPDs) used in PCS must be closely integrated with the EMC grounding system to effectively discharge surge energy and prevent the introduction of new interference. Key points for integration:

1. Proximity grounding and low impedance: The SPD's grounding wire should be as short and thick as possible, directly connected to the main grounding busbar of the equipment or cabinet to minimize the impedance and inductance of the discharge path, which is crucial for limiting residual voltage.

2. Equipotential bonding: SPDs are typically installed at equipment ports (power line and signal line entrances). Their grounding terminals should be equipotentially bonded to the grounding points of port filters and cable shields to ensure potential balance among port components during surges, preventing internal discharge.

3. Coordination with EMC filters: SPDs (especially MOV type) may generate some high-frequency noise when discharging surge current. Therefore, SPDs are usually installed outside the EMC filter (on the line inlet side) to allow the filter to attenuate this noise and prevent it from entering the equipment.