MANUAL DRIVE FOR STEP TRANSFORMER WINDING TAP CHANGERS Russian patent published in 2013 - IPC H01H9/00 H01F29/04 

FIELD: electricity.

SUBSTANCE: invention relates to a manual drive for stepwise control of a step transformer winding tap changer with a locking device, without power consumption. Besides, there is a master shaft, on which per one change there are several manual rotations implemented. There is also a control mechanism, which converts these rotations exactly into one rotation of a geared wheel per one change. The locking mechanism comprises a rotary inner key and a latch rotating around the axis of rotation and a stop, which corresponds to the stop slot of the master shaft, and a stop cam, which corresponds to the slot of the geared wheel of the control mechanism. Due to actuation of the inner key, the latch rotates from the locked position so that the stop and the stop cam are disengaged from the appropriate slots.

EFFECT: higher reliability of protection in respect to undeliberate or deliberate incorrect usage of a manual drive.

7 cl, 10 dwg