INSTRUCTION FOR THE PROTECTION OF UNSYSTEMIC ELECTRICAL SCHOLALS BY HIGHNERGY RESTRAINTS WITH STEEL TRANSIENTS.

摘要

An overvoltage protective device specifically designed for non-symmetric transmission circuits, such as coaxial lines. A coiled section (13.1-6) of a coaxial line (8.1-6) branched off from a coaxial cable (6) wound with a number of turns is disposed within a fully closed second compartment (4) of a metal housing (1). Such a coiled section of a coaxial line together with one or more voltage-dependent current conducting components (16, 17) connected to the outer conductor of said coaxial line (8.1-6), forms a filter which effectively attenuates spurious radiation from said outer conductor at the output side of said filter, said radiation being caused by a destructive EM-pulse. The transmission characteristics of the coaxial line (8.1-6) including said coiled section (13.1-6) are not detrimentally affected by such a filter. An overvoltage protective according to the invention makes it, by its structure, feasible to lead one or more coaxial transmission lines through a wall portion of an enclosed space of the Faraday cage type, while on the other hand an effective protection is provided against destructive radiation such as caused by an EM-pulse.