Patent ID: 8743524
Filing Date: 2014-06-03
Classification: H01T

Abstract:
1. An arrester for lightning protection of elements of electrical facilities or of an electric power line, the arrester comprising an insulating body made of a solid dielectric, two main electrodes mechanically coupled to the insulating body, and two or more intermediate electrodes arranged between the main electrodes and mutually displaced at least along the longitudinal axis of the insulating body, the intermediate electrodes configured to enable a discharge to occur between each of the main electrodes and the intermediate electrode adjacent to said each of the main electrodes and between adjacent intermediate electrodes, characterized in that the intermediate electrodes are located inside the insulating body and are separated from a surface thereof by an insulation layer having a thickness exceeding a precalculated diameter D k of a channel of said discharge, wherein a plurality of discharge chambers are formed between the adjacent intermediate electrodes, the discharge chambers being open to the surface of the insulating body, and wherein a cross-sectional area S of the discharge chambers in a zone of the discharge channel formation is selected to satisfy a condition S<D κ ·g, where g is a minimal distance between the adjacent intermediate electrodes.