GB1251180A - - Google Patents

Abstract

1,251,180. Mechanical switches. E. SCHEUBECK. 12 June, 1970 [18 June, 1969], No. 28519/70. Heading H1N. A non-load change-over switch for tap changers of regularing transformers has fixed main and auxiliary contacts 11, 12, 13, 14 on an insulating cylinder and has movable main and auxiliary contacts 21, 22, 23, 24 guided in radial slots of at least one guide plate, and for each phase a switch segment 35 is rotatably and slidably mounted centrally on a stationary bolt 42, is also rotatably and slidably connected with a star wheel 30 and is provided with arcuate slots 36 in which movable contacts 21, 22, 23, 24 engage by means of roller pins 41. As shown, segment 35 is urged ourwardly by spring 40 and is pivoted on pin 39 in slot 32 in star wheel 30. In the position shown in Fig. 5, main contacts 11, 12 are closed and the spring loaded permanent main contact 51 at the top of the Figure is engaged with permanent fixed main contact 55. If star wheel 30 is rotated clockwise by drive tube 29 (mounted on the drive shaft 33, Fig. 1 (not shown) for the step selector (not shown)) segment 35 rotates in an anticlockwise direction about pin 42 as pin 39 moves round so that auxiliary contacts 22, 12 close and contacts 11, 21 and 51, 55 open, Fig. 6 (not shown). As star-wheel 30 is rotated further clockwise, segment 35 rotates further anticlockwise so that auxiliary contacts 13, 23 close and contacts 12, 22 open, Fig. 7 (not shown). As star-wheel 30 is rotated further clockwise main contacts 14, 24 close and the permanent main contacts 51, 55 at the bottom of the Figure close and contacts 13, 23 open Fig. 8 (not shown). Contacts 51 are connected to contacts 21, 24 by flexible leads 56, Fig. 2 (not shown), contacts 21 and 22 and contacts 23 and 24 are connected by flexible leads 48, Fig. 2, and contacts 22 and 23 are both connected to bolt 42 by flexible leads 47, Fig. 2, and bolt 42 is connected by bars 44, Fig. 1 (not shown) and straps 46, Fig. 1, with a star point output contact 45. There are two sets of contacts electrically connected together for each phase, spaced axially, and one guide plate 27, Fig. 1, for each set of contacts and one star wheel 30 disposed between the guide plates. An are chamber 34, Figi 2, is around each pair of contacts.