Change-over switch for tap-changing regulating transformers

Details Change-over switch for tap-changing regulating transformers Change-over switch for tap-changing regulating transformers

H - Electricity

01

H

306/327

H01H 19/20 (2006.01) H01H 9/00 (2006.01)

Patent

CA 1118826

Abstract of the Disclosure A spring-drive for load change-over switches of tap-changing regulating transformers. The drive is intended for use in connection with change-over switches having main arcing contacts and current-carrying contacts engaged and disengaged in a pre- determined sequence during change-over operations. The drive includes at least one compression spring arranged between a first slide operable by an eccentric driven by a drive shaft, and a second slide driving the change-over switch by the intermediary of a crankshaft. The crankshaft is adapted to be arrested at the end of each operating cycle when the current-carrying contacts of the change-over switch are in engagement by a pair of pawls each engaging one of a pair of recesses forming part of the crankshaft. To avoid malfunction of the drive mainly due to changes in temperature of its surroundings, a pair of additional recesses form- ing part of the crankshaft are provided. Each pair of additional recesses is arranged ahead of one of the pair of recesses as seen in the direction of motion of the crankshaft so that the crankshaft may be arrested by one of the pair of pawls when the crankshaft is in a position that corresponds to the closed position of the main arcing contacts, but short of the maximal travel thereof that corresponds to the closed position of the current-carrying contacts. -1-

321547

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