Lightning protection design measures and requirements for building photovoltaic power generation systems
1. The choice of the construction site of the solar photovoltaic power generation system or power station should be avoided as far as possible in locations and occasions that are prone to lightning strikes. At the same time, try to avoid the projection of the lightning rod from falling on the solar cell array components.
2. According to the site conditions, different protective measures such as lightning rods, lightning protection strips, and lightning protection nets can be used to protect against direct lightning strikes to reduce the probability of lightning strikes, and multiple evenly arranged down conductors should be used as much as possible to introduce lightning strike current into the ground. The shunting effect of multiple down-conductors can reduce the lead wire voltage drop of the down-conductors, reduce the risk of side-impact, and reduce the magnetic field strength generated by the down-conductor leakage.
3. In order to prevent lightning induction, all-metal objects of the entire photovoltaic power generation system, including the outer frame of the battery module, equipment, chassis/cabinet shell, metal conduit, etc., should be equipotential connected to the joint grounding body, and they should be independently grounded. Equipotential bonding of photovoltaic power generation systems.
4. The grounding types of photovoltaic power generation systems mainly include lightning protection grounding, safety protection grounding, working grounding and shielding grounding.
When safety protection grounding, working grounding, shielding grounding and lightning protection grounding share a set of grounding devices, the grounding resistance shall be determined according to the minimum value among them. If the lightning protection has a separate grounding device, the other three groundings should share a set of grounding devices, and the grounding resistance should not be greater than the minimum value.
When conditions permit, the lightning protection grounding system should be set up separately as far as possible, not shared with other grounding systems, and ensure that the distance between the grounding body of the lightning protection grounding system and the public grounding body is kept more than 3m underground.
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