Overvoltage arrester with air gap

H - Electricity – 01 – T

Patent

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317/25

H01T 4/02 (2006.01) H01T 4/12 (2006.01)

Patent

CA 2000766

For reducing the engineering cost of construction and manufacture for the air gap associated with the second electrode in an overvoltage arrester with air gap connected in parallel, the arrester (22) is enclosed by a cylindrical metal sleeve (28). One edge (19) of this metal sleeve contacts the first electrode (3) of the arrester, while the other edge (14) is laid over inwardly and grips the auxiliary electrode (27) placed on the second electrode (25) with interposition of an insulating disk (26). The outside diameter of this auxiliary electrode (27) is greater than the outside diameter of the second electrode (25). For the centering of the arrester (22) in the metal sleeve (28) the distance between the arrester and the metal sleeve is smaller, at least at three points over the circumference, than the required radial safety distance between the metal sleeve and the second electrode. This can be achieved, for example, by several punctiform depressions (30) of the metal sleeve arranged uniformly distributed over the circumference or also by an annular constriction (29).

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