Patent ID: 9127751
Filing Date: 2015-09-08
Classification: F16H,H01F,H01H,Y10T

Abstract:
1. A gearbox for a tap changer, which gearbox has an input drive shaft arranged to be connected to a motor and includes a diverter switch drive output with a diverter shaft, which diverter switch drive output is arranged to be connected for actuation of breakers in a diverter switch of the tap changer, characterized in that the gearbox further includes first and second selector arm drive outputs, arranged for actuation of a tap selector of the tap changer, reduction gear means connecting the input drive shaft to the diverter switch drive output and to each of the selector arm drive outputs timing connection means arranged to connect the reduction gear means to each of the selector arm outputs, wherein the gearbox is arranged such that a plurality of revolutions of the input drive shaft completes one operation cycle for the tap changer, during which operation cycle the diverter switch drive output rotates 150° to 180° , and during which operation cycle in a first mode one of the selector arm outputs rotates an angle in the range of 90° to 180° , which rotation occurs during a fraction of the operation cycle and the other is stationary, and during which operation cycle in a second mode both the selector arm outputs are stationary, whereby the first mode represents that the input drive shaft rotates in the same direction as in the nearest preceding operation cycle, and the second mode represents that the input drive shaft rotates in the opposite direction as in the nearest preceding operation cycle.