Grid-connected cabinet as the key equipment of PV power generation system connected to the grid, its normal operation is crucial to the performance and safety of the whole system. The following are some common faults of grid-connected cabinets and their solutions:
Common faults and their solutions:
1. **Grid-connecting cabinet can not be grid-connected **
- **Cause**: may be grid fault, grid-connected cabinet protection device action, communication failure, etc..
- **Solution**:
- Check whether the power grid is normally supplied.
- Check whether the protective device of the grid-connected cabinet has alarm or action, reset the protective device or find the cause of the fault.
- Check the communication line and parameter setting between the grid-connected cabinet and the upper computer.
2. **Display abnormality of grid-connecting cabinet** **Cause**: It may be the result of the following factors
- **Cause**: The display may be damaged, background data error or communication failure.
- **Solution**:
- Check whether the display is damaged and replace the display if necessary.
- Restart the background monitoring system and check whether the data is back to normal.
- Check the communication lines and interfaces to ensure normal communication.
3. **Frequent tripping of circuit breakers**
- **Cause**: May be overload, short circuit, leakage or equipment failure.
- **Solution**:
- Check whether the load exceeds the rated capacity of the circuit breaker.
- Use an insulation tester to check line insulation.
- Check whether there is a short circuit or grounding point inside the grid-connected cabinet.
- Check whether there is any abnormality in the PV power generation system, such as inverter failure.
4. **Overheating of internal components of the grid-connected cabinet**
**Cause**: May be overload, poor contact or poor heat dissipation.
**Solution**:
Check if the load current exceeds the component rated current.
Check that all connection points are firm and have good contact.
Ensure that the inside of the grid-parallel cabinet is well ventilated and clean the heat sink.
5. **Grid-connecting cabinet ground fault**
**Cause**: It may be a loose ground wire, excessive grounding resistance, or damage to the grounding system.
**Solution**:
Check whether the grounding wire is firmly connected.
Measure the grounding resistance to ensure that it meets national standards.
Check the grounding system for damage and repair if necessary.
6. **Damage to the lightning arrester of the grid-connecting cabinet**
**Cause**: Possible lightning strike or grid voltage fluctuation.
**Solution**:
Replace the damaged lightning arrester.
Check that the lightning protector is well grounded.
Consider adding additional lightning protection.
Comprehensive Measures:
- Perform regular maintenance and inspection of the grid-connected cabinet to ensure that all components operate normally.
- Do a good job of preventing dust, moisture and heat dissipation in the grid-connected cabinet.
- Record the operating data of the grid-connected cabinet, analyze the causes of faults and take preventive measures.
When dealing with any electrical faults, make sure you follow safe operating procedures and call in a professional for repairs if necessary.
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