Understanding Thunder and Lightning

Thunder and lightning are atmospheric discharge phenomena, with lightning currents being microsecond-level instantaneous currents equivalent to high-frequency currents in the megahertz range. Photovoltaic systems may be affected by direct lightning strikes and inductive lightning, causing direct harm to equipment and circuits or inducing overvoltages that can damage electronic devices and circuits. Therefore, effective lightning protection grounding is of utmost importance.

Implementation of Lightning Protection Grounding

I. Lightning Protection Grounding in Photovoltaic Systems

1. Grounding on the DC Side

• Cross-connection of component frames

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• Effective connection of components to support structures

  

• Grounding of support structures

  

   

These measures aim to ensure effective grounding between photovoltaic components and support structures, preventing direct harm from lightning to the system.

2. Grounding on the Inverter Side

• *Operational grounding

  

• *Protective grounding

  

   

The grounding of the AC output terminal of the inverter needs to ensure proper wiring, and the visual grounding hole on the inverter's outer casing should be repeatedly grounded, providing dual protection for the inverter and ensuring the safety of operational personnel.

3. Grounding on the Distribution Box Side

• *SPD surge protection grounding

  

   

• *Casing grounding

  

Grounding for surge protection devices (SPD) and the grounding of the distribution box casing are crucial steps in preventing the system from being affected by lightning strikes. Additionally, the grounding of equipment inside the casing should be connected to the PE bus, ensuring the overall grounding quality of the system.

II. Consequences of Poor Grounding

1. Non-compliant grounding may lead to inverter errors, impacting the normal operation of the system and, consequently, the revenue of the solar power plant.

2. Improper grounding poses risks to personal safety and property, increasing overall safety hazards.

Conclusion

Lightning protection grounding in photovoltaic systems is paramount, as it not only ensures the long-term stable operation of the system but also effectively reduces the risk of lightning strikes, ensuring the safety of personnel and property. During installation, attention should be given to details to enhance installation quality, coupled with regular maintenance to mitigate post-operation risks and minimize losses to the solar power plant. Through rational lightning protection grounding measures, photovoltaic systems can generate power safely and efficiently under various weather conditions.

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