In the construction of photovoltaic power generation systems, lightning protection grounding is a crucial component. The quality of its construction directly impacts the safe and reliable operation of electrical equipment and the personal safety of operational personnel. This article will focus on discussing the issues related to lightning protection grounding in photovoltaic systems to ensure construction quality and grounding resistance meet design requirements.
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.
Cross-connection of component frames
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.
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.
*SPD surge protection 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.
Non-compliant grounding may lead to inverter errors, impacting the normal operation of the system and, consequently, the revenue of the solar power plant.
Improper grounding poses risks to personal safety and property, increasing overall safety hazards.
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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