Container House Electric Protection

Electric protection for container houses requires comprehensive handling from multiple aspects such as grounding, anti-static measures, electrical layout, insulation protection, and lightning protection. The specific measures are as follows:

Grounding System

• Equipment Grounding: The electrical equipment inside the container must be reliably grounded to reduce the risk of electric shock. Each grounding terminal of the internal components of the electrical equipment and the cable shielding layer should be connected to the equipment's own 100mm² grounding copper bar using a 4mm² yellow-green bicolored grounding wire. This 100mm² grounding copper bar should then be connected to the equipotential grounding network inside the container using a 6mm diameter bolt and a 100mm² copper cable. Each piece of equipment should be grounded separately, and series connection is strictly prohibited.
• Equipotential Grounding Network: Below the anti-static floor of the energy storage container, lay a dedicated 250mm² grounding copper bar along the direction of the electrical equipment layout. Connect the ends of this dedicated copper bar to form an equipotential grounding network inside the container and lead it out to the grounding point outside the container.
• Grounding Point Requirements: The container should provide at least 2 grounding points that meet the most stringent electrical standards in the form of copper bars, and these points should be located on the diagonal of the container. Finally, use a 250mm² grounding copper bar or more than 4 copper strip cables with a cross-sectional area of not less than 50mm², equipped with copper bolts with a diameter of not less than 10mm, to connect to the main grounding network outside the container at a single point. The grounding resistance should not exceed 4Ω, and multi-point connection methods should not be used.

Anti-Static Measures

• Anti-Static Floor: The floor of the energy storage system container can use a fully steel load-bearing anti-static floor or a thick wood-based ceramic anti-static floor. The system resistance value of the anti-static floor is 1×10⁶1×10⁹Ω, and the surface resistance value is 2.5×10⁴1.0×10⁹Ω. At a temperature of (21±1.5)℃ and a relative humidity of 30%, the static voltage should not exceed 2500V, which can effectively discharge static charges and prevent the generation of static electricity.

Electrical Layout and Insulation Protection

• Reasonable Layout: The technical performance, identification, safety, and wiring methods of the electrical equipment inside the container must comply with the relevant provisions of national or industry standards to avoid short circuits, electric leaks, and other accidents caused by the equipment being too close to each other.
• Insulation Protection: The passageways in the box-type energy storage battery room should be paved with high-quality flame-retardant insulation mats with an insulation voltage of not less than 5kV. The insulation mats should be fully laid in the passageways and gaps between equipment cabinets throughout the container and should be neatly and aesthetically cut.

Lightning Protection Measures

• Lightning Protection System Configuration: The lightning protection grounding of the energy storage system should be carried out in strict accordance with relevant specifications. The roof of the container must be equipped with a high-quality lightning protection system with reliable connections. The lightning protection system should be connected to at least 2 grounding bars provided by the container for users through grounding flat steel or grounding round steel.