PV grid-connected cabinet is the key equipment to connect the PV power generation system with the public power grid, it is very important to ensure its safe and stable operation. The following are some considerations in the use and management of PV grid-connected cabinets:
1. **Choose a suitable grid-connecting cabinet**:
- Confirm that the capacity, voltage level and other technical parameters of the grid-connecting cabinet meet the needs of the PV power generation system.
- Select grid-connected cabinets that comply with national standards and industry regulations, and ensure that they have the appropriate certification mark.
2. **Installation environment**:
- The grid-connected cabinet should be installed in a dry, well-ventilated environment free of corrosive gases and flammable and explosive hazards.
- Ensure that the installation location is easy to operate and maintain, while avoiding direct sunlight.
3. **Safety measures**:
- Ensure that the grid-connecting cabinet is equipped with protection functions such as short circuit, overload and leakage.
- All wiring must be firm and reliable, and the terminals should be checked regularly to prevent loosening.
- The grid-connected cabinet should be equipped with suitable circuit breakers and its performance should be checked regularly.
4. **Grounding and lightning protection**:
- The grid-connected cabinet must be reliably grounded, and the grounding resistance should be in accordance with national standards.
- Install lightning protection devices to protect the equipment from lightning damage.
5. **Operation and Maintenance**:
- Operators must be professionally trained to understand the structure, performance and operating procedures of the grid-connecting cabinet.
- Conduct regular maintenance and inspection of the grid-connecting cabinet, including cleaning, fastening and testing of protection devices.
- Replace damaged parts in time to ensure that the grid-connecting cabinet is always in good condition.
6. **Marking and warning**:
- The grid-connecting cabinet should be clearly labeled with the parameters of all incoming and outgoing lines, including voltage, current, phase sequence, etc.
- Necessary warning labels, such as “High Voltage Danger”, “No Touching”, etc. should be affixed.
7. **Monitoring and recording**:
- Install a grid-connected monitoring system to monitor the operation status of the PV power generation system in real time.
- Record the operation data and maintenance of the grid-connected cabinet for easy analysis and troubleshooting.
8. **Compliance with regulations**:
- Comply with national and local laws and regulations related to grid-connected PV power generation.
- All necessary approval procedures should be completed before grid connection to ensure that the grid connection operation is legal and compliant.
9. **Emergency plan**:
- Formulate an emergency plan, including countermeasures for emergencies such as grid-connected cabinet failures and fires.
- Conduct regular emergency drills to improve the ability to respond to emergencies.
Through the above precautions, the safe operation of the PV grid-connected cabinet can be effectively ensured and the stability and reliability of the PV power generation system can be promoted.
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