Lightning is mainly divided into two types of hazards: direct lightning strikes and indirect lightning strikes.
Protection against direct lightning strikes: Metal lightning protection wires are installed on tall buildings, including lightning rods, lightning strips, and grounding devices, which can release the huge thunderstorm cloud charge. All electrical equipment in the photovoltaic system cannot protect against direct lightning strikes.
Protection against inductive lightning: The photovoltaic system has lightning protection modules in electrical equipment such as junction boxes and inverters to protect against indirect lightning strikes. The inverter has secondary and tertiary lightning protection. The secondary lightning protection uses lightning protection modules and is generally used in medium and large photovoltaic power stations. There are no tall buildings around the power stations. The tertiary lightning protection uses lightning protection devices and is generally used in small household photovoltaic power stations. There are tall buildings around the power stations.
Distributed photovoltaic power generation systems are equipped with lightning protection devices, which do not need to be disconnected in normal thunderstorm weather. If you encounter strong thunderstorms, for safety reasons, it is recommended to disconnect the DC switch of the inverter or junction box and cut off the circuit connection with the photovoltaic components to avoid harm caused by inductive lightning.
Operation and maintenance personnel should regularly inspect lightning protection facilities to ensure the normal operation of lightning arresters, down conductors and grounding systems, ensure that the short-circuit resistance of the lightning protection grounding system is below 4 ohms, and regularly inspect the performance of lightning protection modules in the equipment to prevent failure. This ensures that the equipment will not be damaged even on rainy days.
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