Four lines of lightning protection for power lines:

Lightning break is a common problem, power line break, insulator flashover, resulting in a large area of power failure, loss of electricity sales and serious personal injury accidents and resulting huge economic losses.

A, shielding (blocking): lightning rod, lightning rod, use cable and other measures, not around the strike not directly hit the wire;

Two, insulator flashover (blocking): strengthen insulation, improve grounding and other measures, use lightning arrester;

Iii. Flash burning transfer (thinning): Even if the insulator flashover, it should not be transformed into a stable power frequency arc as far as possible, so as to improve the reliability of arc extinguishing, change the arc path, transfer the failure point, and switch without tripping. For this reason, the power frequency electric field intensity of the insulator should be reduced or the neutral point of the grid should be ungrounded or pass through the arc suppression ring. This allows most single-phase ground faults caused by lightning strikes to be eliminated automatically without short-circuit and tripping between phases.

Four, no power outage: This is the last line of defense, even if the switch trip will not interrupt the power supply. To this end, it can adopt automatic reclosing or double circuit, ring network power supply and other measures.