1. simple lightning protection measures
① make a simple lightning protection device outside the equipment to protect solar panels and electrical equipment from direct lightning strikes.
② for the power supply line between the equipment and the solar panel, install a lightning arrester, the model is selected according to the working voltage of the dc load.
③ the down conductor of the lightning arrester and the grounding wire of the arrester must be well grounded to achieve the purpose of rapid discharge.
2. complex lightning protection measures
① install a first-level lightning protection device between the solar panel and the inverter. the model is selected according to the large no-load voltage of the on-site inverter.
② install a second-level lightning protection device between the inverter and the power distribution cabinet and between the power distribution cabinet and the load equipment. the model is selected according to the working voltage of the power distribution cabinet and the power supply equipment;
③ all lightning protection devices must be well grounded.
3. grid-connected lightning protection measures
① install a first-level power lightning protection device between the photovoltaic cell module and the inverter or power regulator for protection. this is the main way for the power supply line to enter the room from the outside, so it must be protected against lightning electromagnetic pulses. the specific model is determined according to the on-site situation.
② install a second-level power surge protector between the inverter and the power distribution board for protection. the specific model is determined according to the on-site situation.
③ install a third-level power surge protector between the power distribution board and the load to protect the load equipment from being damaged by surge over-voltage. the specific model is determined according to the field equipment.
④ all lightning protection devices must be properly grounded, and the grounding of all equipment must be connected to the public ground.