Lightning is mainly divided into two hazards: direct lightning strikes and indirect lightning strikes.
Protection against direct lightning strikes: set up metal lightning protection grounding conductors on tall buildings, including lightning rods, lightning protection belts, and grounding devices, which can release the huge thunderstorm cloud charge. All electrical equipment in the photovoltaic system cannot protect against direct lightning strikes.
Inductive lightning protection: Photovoltaic systems have lightning protection modules in electrical equipment such as combiner boxes and inverters to protect against indirect lightning strikes. The inverter has two levels of lightning protection and three levels of lightning protection. The second level of lightning protection uses lightning protection modules, which are generally used in medium and large photovoltaic power plants. There are no tall buildings around the power station. The third level of lightning protection uses lightning protection devices. It is used for household small-scale photovoltaic power plants, and there are tall buildings around the power plant.
Distributed photovoltaic power generation systems are equipped with lightning protection devices, so there is no need to disconnect them in normal lightning weather. If there is a strong thunderstorm, for safety reasons, it is recommended to disconnect the DC switch of the inverter or combiner box and cut off the circuit connection with the photovoltaic module to avoid damage caused by induced lightning.
The operation and maintenance personnel should do a good job of testing the lightning protection facilities at ordinary times to ensure that the air receptors, down conductors and grounding systems are normal, ensure that the short-circuit resistance of the lightning protection grounding system is below 4 ohms, and regularly test the performance of the lightning protection module in the equipment. Prevent failures so that thunderstorms do not damage equipment.