An Electrical Switch For An On Load Tap Changer

Abstract: An electrical switch (1) for an on-load tap changer (2), said electrical switch (1) comprising: at least three electrical contacts (3a, 3b, 3c) connected to a respective electrical conductor (4a, 4b, 4c), a switch means (5) configured to be movable between a plurality of positions (P1, P2), wherein the switch means (5) in each respective position (P1, P2) physically contacts a respective combination (C1, C2) of said electrical contacts (3a, 3b, 3c) to provide electrical contact between the electrical contacts in each respective combination (C1, C2) of electrical contacts (3a, 3b, 3c), a hermetically sealed housing (6) providing an inner space (7) enclosing the electrical contacts (3a, 3b, 3c) and the switch means (5), said electrical conductors (4a, 4b, 4c) extending from the electrical contacts (3a, 3b, 3c) inside the inner space (7) of the housing (6) to an outside of the housing (6), and a control means (10) configured to control movement of the switch means (5). The inner space (7) is under vacuum or is filled with an arc suppression gas. The control means (10) comprises an operating member (8) extending from the outside of the housing (6) into the inner space (7) of the housing (6), said operating member (8) being operatively connected to the switch means (5) such that the operating member (8) is able to move the switch means (5) to the plurality of positions (P1, P2) depending on a position of the operating member (8). Also, the operating member (8) comprises an arm (9) rotatably attached to the housing (6) for rotation about a rotational axis (11), wherein the switch means (5) is attached an end portion of the arm such that the switch means (5) is movable between said plurality of positions along an arcuate path.

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