| 摘要 |
PURPOSE:To enable opening and closing of a vacuum switch in a prescribed number of times for unidirectional revolution of an output shaft of an on-load tap changer by so constructing it that a revolving lever may execute reciprocatory rotations in a prescribed number of times for unidirectional revolving motion of an energy storing mechanism. CONSTITUTION:When the output shaft 1 of an energy storing mechanism rotates in one direction, a roller 23 urged by a cam 2 moves rightwardly in the figure, a revolving lever 20 rotates counterclockwise, an arm 21A is moved downwardly and an arm 21B is moved upwardly. In this manner, a connector 11B moves upwardly, and a movable electrode 10B accordingly moves upwardly, so that a vacuum switch B is closed by its vacuum self-closing force. On the other hand, a vacuum switch A retains in closed state. When the shaft 1 is further rotated in the same direction, the arm 21A urges the connector 11A to open the switch A. In this manner a make-before break function is imparted to the opening and closing sequence of the switches A, B. Further, when the cam 2 is so formed that the roller 23 executes reciprocatory motion for the revolution of the shaft 1, it can open and close the vacuum switches in a prescribed number of times. |
