According to the NF C 17-102 , September 2011, Annex C standard, the ESE air terminals must be  tested in HV Lab (calculation of the advanced triggering time Δt). INDELEC conducted these tests in French independent labs (Renardières HV Lab, Cediver lab in Bazet) as well as abroad (Belgium, Canada, South Korea, China, Czech Republic, India), INDELEC is also conducting tests in its own HV lab in North of France for research and development of new products purposes.

The high voltage laboratory used to assess the PREVECTRON®, contained the following equipment:

  • A direct current generator designed to simulate the ambient atmospheric field during a storm;
  • A surge generator allowing induced rapid stimulation of the pre-strike electric field.

These two generators fed a plate positioned above the air terminal being tested.

The PREVECTRON® air terminal and the single rod used as a reference are positioned one after the other so as to be at the same vertical distance beneath the plate.

The wave generator increases the electric field between the upper plate and the ground. This impulse field superposes upon the permanent field of the D.C. generator.

With this set-up a breakdown is produced between the tip and the plate. This breakdown short-circuits the generator leading to the wave form’s returning abruptly to zero.

With the single rod, this breakdown is produced in a high «ESingle Rod» field. With a PREVECTRON® lightning conductor however, the breakdown is produced earlier and in a less-intense field (EESE).

The time gained allows the lightning conductor’s effectiveness to be accurately measured