A: Lightning is divided into direct lightning and induction lightning. Direct lightning is the lightning directly falling on the lightning objects, causing the greatest damage; induced lightning is the induced high voltage generated by the electromagnetic wave generated by lightning on the conductor, which makes the electrical appliances connected to the conductor over-voltage and damage.

In the power grid, multi-stage lightning arresters have been installed, but the residual voltage of the former stage lightning or the lightning induced voltage near the inverter will still cause damage to the inverter.

Solution: install lightning arrester in inverter control cabinet.

The incoming line arrester can adopt power lightning protection module, slide installation and parallel grounding. The arrester module is gap discharge, the impulse discharge current is 15kA (10 / 350 μ s), and the working voltage is 250V. It is also possible to use parallel varistor in the power line for lightning protection.