Contact system for an on-load tap changer and on-load tap changer

Abstract

A contact system (1) for a tap changer comprises a first and a second fixed contact unit (20) each with at least one fixed electrical contact element (24), and a movable contact unit with at least one movable electrical contact element (10). The moveable contact unit comprises a two-level driving contact with contact portions (11, 12) which are arranged offset to each other with respect to a rotation axis (R2) of the moveable contact element (10). The contact system (1) further comprises a driving unit (3) to rotationally drive the movable contact element (10) towards the respective fixed contact element (24) of the associated fixed contact unit (20). The driving unit (3) comprises a two-level driving contact with protrusions (6, 7) which are arranged offset to each other with respect to a rotation axis (R1) of the driving unit (3). The movable contact unit and the driving unit (3) are configured so that a first state, in which the movable contact element (10) is in electrical contact with the contact element (24) of the first fixed contact unit (20), and a second state, in which the moveable contact element (10) is in electrical contact with the contact element (24) of the second fixed contact unit (20), are settable.

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