Back flashover (lightning)

A flashover of insulation resulting from a lightning stroke to part of a network or electrical installation that is normally at ground potential.

Comment: The typical example of such an event occurs when a lightning flash strikes the pole or shield wire of a transmission or distribution line, resulting in a flashover of the line insulators.

Source: UIE Guide to Quality of Electriical Supply for Industrial Installations, Part VI: Transient and Temporary Overvoltages and Currents