How should the shielding of the power cable in an energy storage system PCS be grounded?

Grounding the shielding layer of PCS power cables (such as AC output and DC input cables) is crucial for suppressing radiated and conducted interference. A double-ended grounding method should be used, meaning the shielding layer should be reliably grounded at both the PCS cabinet outlet and the load end (such as a transformer or power grid connection point). This provides a low-impedance metallic return path for high-frequency common-mode noise currents in the cable, allowing the noise current to flow back to the source through the shielding layer, rather than through spatial radiation or forming an uncontrollable loop through the ground.

Key points for grounding implementation:

1. 360-degree overlap: Use shielded cable connectors or metal clamps to ensure a 360-degree full-circumference contact between the shielding layer and the grounding terminal, rather than a "pigtail" single-point connection, to guarantee low impedance at high frequencies.

2. Low-impedance grounding: The grounding terminal should be connected to the low-impedance grounding busbar of the PCS cabinet.

3. Maintain continuity: The shielding layer must maintain electrical continuity at any joint in the cable.