How can the shielding effectiveness of the PCS metal cabinet in an energy storage system be guaranteed?

Ensuring the shielding effectiveness of a PCS metal cabinet requires attention to multiple aspects, including structural design, gap treatment, and material selection. The core principle is to ensure the cabinet forms a continuous, conductive enclosure. Guarantee measures include:

1. Good conductive connections: All connections between metal plates should be welded or continuous seam welded. If screw connections are used, the screw spacing must be sufficiently small (typically much smaller than 1/20 of the noise wavelength), and conductive gaskets should be used at the joints.

2. Treatment of all openings: All openings, including ventilation openings, cable entry points, display windows, and operating holes, must be treated with specialized devices such as electromagnetically shielded ventilation windows, shielded cable connectors, conductive glass, or waveguides.

3. Cabinet door treatment: Finger springs or conductive rubber gaskets must be used between the cabinet door and the door frame, ensuring sufficient contact points and closing force.

4. Surface conductive continuity: The paint layer on the inner and outer surfaces of the cabinet must be scraped off at the joints to ensure direct metal-to-metal contact.

5. Single-board grounding: The reference ground of the internal PCB should be connected to the chassis at a single point with low impedance.