VACUUM ARC-EXTINGUISHING CHANGEOVER SELECTOR

摘要

A changeover selector with a vacuum arc-extinguishing circuit comprises: a central shaft (601); a moving contact (603) driven by the central shaft to rotate; and a first fixed contact (604) and a second fixed contact (605) which are circumferentially arranged on an insulating lath of a cage body of the changeover selector. The moving contact is rotated under the drive of the central shaft and then switched between the first fixed contact and the second fixed contact, and the moving contact and the first fixed contact and the second fixed contact compose a main circuit for changeover selection. A vacuum arc-extinguishing branch containing a vacuum tube (607) is connected to the main circuit for changeover selection in parallel, and the vacuum tube is opened after the moving contact is separated from the first fixed contact and is closed before the moving contact is electrically connected to the second fixed contact. The changeover selector with a vacuum arc-extinguishing circuit has the advantages of a simplified mechanism and reliable control, solves the problem of pollution of transformer oil due to the fact that the changeover selector generates an electric arc; and the structure size is small, thereby being able to reduce the occupied space of the changeover selector, save the space of a transformer box body, and reduce the costs of transformers and transformer oil.