Gas-discharge overvoltage arrester

H - Electricity – 01 – T

Patent

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Details

H01T 4/02 (2006.01) H01C 7/12 (2006.01) H01T 1/14 (2006.01)

Patent

CA 2121642

A gas-filled three-electrode overvoltage arrester may be developed in such a manner that it has dependable "fall-safe" and "vent-safe" behavior. For this purpose, a two-arm spring clip (10) is fastened to the center electrode (1). The ends of the two-arm spring clip (10) rest, with the interpositioning of a spacer (20, 21; 22, 23), against the ends of the end electrodes (2, 3). The end of each arm of the spring clip bears a cap (14, 15) which is provided with a flange-like edge (16, 17). One end of the connecting wire (6, 7) of each end electrode has the shape of a ring (61, 71) which is fastened at the end side to the end electrode. The ring of the connecting wire and the flange-like edge of the cap are opposite each other and are held apart by a disk-shaped fusible pellet (20, 22) and a cylindrical part (21, 23) having insulating properties. The cylindrical part consists either of a temperature-resistant insulating material or of a metal-oxide varistor.

Cette invention concerne un limiteur de tension à gaz à trois électrodes monté de façon à assurer un fonctionnement fiable à "sécurité intégrée". cette fin, un clip à ressort bibranche (10) est fixé à l'électrode centrale (1). Les extrémités du clip (10) reposent par l'intermédiaire d'un espaceur (20,21; 22, 23) contre les extrémités des électrodes latérales (2,3). l'extrémité de chacune des branches du clip à ressort, on trouve un capuchon (14, 15) à rebord (16, 17). Une extrémité du fil de connexion (6, 7) de chacune des électrodes latérales a la forme d'un anneau (61, 71) qui est fixée à l'extrémité desdites électrodes. L'anneau du fil de connexion et le capuchon à rebord se font face et sont séparés par un disque fusible (20, 22) et une pièce cylindrique (21, 23) à propriétés isolantes. La pièce cylindrique est fait soit d'un matériau isolant insensible à la température soit d'une varistance à oxyde métallique.

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