| 摘要 |
<p>The present invention relates to a method and a system for a pre-selector with contacts in a tap changer of a transformer. The system comprises a moveable part (2) being connected to one of the contacts of the pre-selector and being arranged to be pivotally moveable around a pivot point (3) between a first and a second end position. The system further comprises a first and a second spring (4,5) arranged to act on the said moveable part.
When the moveable part is pivotally moved past a first knee position, the force from the first spring is acting in the same direction as the started pivotal movement towards the second end position.</p> |
