Impulse Impedance Measurements of Lightning Protection Earthings

Lightning protection earthing systems should be tested at currents with time parameters similar to those of lightnings. A method and definition of a measured value of impulse impedance are introduced. The impulse impedance was determined by a quotient of voltage drop on the tested earthing to a value of current in measure circuit. The usefulness of the impulse method for lightning protection evaluation is tested on radio base stations tower, transmission line towers, and buildings. Application of the earthing impulse meter is described in this paper.