TAP CHANGER FOR A TRANSFORMER

摘要

The invention relates to a tap changer for a transformer, consisting of a plurality of mutually parallel, spaced-apart contact bars (2) which are arranged in a circle around a center longitudinal axis (MLA) and a contact arrangement (5) which is rotatable in relation to the contact bars (2). In order to produce a convection cooling effect, the contact bars (2) are at least partially hollow, each bar having at least one first opening (6) for a cooling medium to flow into the bar and at least one second opening (7) for a cooling medium to flow out and the first and second opening (6, 7) being arranged at a distance to each other along the center longitudinal axis (MLA).