The Working Principle of Dmsgi, Early Streamer Emission Lightning Conductor- Protector The Protector is an active lightning conductor designed to conform to the French standard NF C 17 102 (July 1995) for ESE lightning conductors. Its working principle evolves from local electrostatic field that develops naturally around the system as a thunderstorm begins to gather. In the event of a descending lightning an inbuilt triggering device generates high-tension pulses at the conductor tip causing a corona effect. As the downward leader approaches the ground powerful upward streamers get triggered off aided by a strong venturi effect that is built in the system. The early synchronization between the downward and upward leaders thus achieved by the Protector easily meets the triggering advance timing (AT) as laid down in the French standard NF C17102