Surge arrester

Details Surge arrester Surge arrester

H - Electricity

01

T

317/25

H01T 1/22 (2006.01)

Patent

CA 1126330

ABSTRACT OF THE DISCLOSURE The invention relates to a surge arrester having a gas-filled housing in which copper electrodes, in the form of stepped truncated cones, face each other and are spaced apart by a tubular insulating element. The electrodes have walls which are thicker in the vicinity of their active sur- faces, than the conical walls in the vicinity of the transition to the insulating element. This surge arrester is noteworthy for its small dimensions, satisfactory alternating-current and surge-current carrying capacity, and long service life, combined with low surge voltage response and high extinction voltage. To this end, the active surfaces of the copper electrodes are pro- vided, according to the invention, with indentations such as a deep honeycomb or concentric rings in which an electrode-activating mixture, consisting of aluminum powder and magnesium oxide, is anchored. A gas-filled surge arrester according to the invention is particularly suitable for the protection of communications lines.

330768

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