| 摘要 |
A contact arrangement consisting essentially of copper or of a copper alloy, for load selectors of stepping transformers, having at least one cylindrical contact roller which is guided in a moving contact carrier and can roll off along a predetermined rolling track on the essentially flat surface of a stationary contact piece. In this case, in the ex-works state, the surface of the stationary contact piece is provided with grooves which run obliquely with respect to the rolling track, and the surface of the cylindrical contact roller is provided with helical grooves. In this case, the contact roller is arranged such that the grooves cross one another when the contact roller rolls off on the surface of the contact piece. |
