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

Abstract

A contact unit for an on-load tap changer comprises a connector body and a contact holder coupled to each other, wherein the connector body is configured to connect the contact holder to a contact of the on-load tap changer. The contact unit further comprises a contact element coupled to the contact holder and configured to make electrical contact to a contact element of a contact device for the on-load tap changer. The contact unit further comprises drive and guiding means coupled to the contact holder such that the contact element is movable driven and linearly guided in a direction away from the connector body.

1 . A contact unit for an on-load tap changer, comprising:
 a connector body and a contact holder coupled to each other, wherein the connector body is configured to connect the contact holder to a contact of the on-load tap changer;   a contact element coupled to the contact holder and configured to make electrical contact to a contact element of a contact device for the on-load tap changer; and   drive and guiding means coupled to the contact holder such that the contact element is movable driven and linearly guided in a direction away from the connector body, characterized in that wherein the drive and guiding means comprise at least one linear ball bearing and an axis arranged inside the bearing configured to provide linearly guided movement of the contact element of the contact unit;   a further contact holder coupled to the connector body;   a further contact element coupled to the further contact holder and configured to make electrical contact to a contact element of a contact device for the on-load tap changer; and   further drive and guiding means coupled to the further contact holder such that the further contact element is movable driven and linearly guided in a direction away from the connector body; and   wherein the contact holders, the contact elements and the corresponding drive and guiding means are coupled to the connector body such that the directions the corresponding contact elements are movable along enclose a predetermined angle.   
     
     
         2 . The contact unit of  claim 1 , wherein the contact element of the contact unit comprises a rotatable roller to make electrical contact to a contact element of a contact device for the on-load tap changer. 
     
     
         3 . The contact unit according to  claim 1 , wherein the contact element of the contact unit comprises a slider to make electrical contact to a contact element of a contact device for the on-load tap changer. 
     
     
         4 . The contact unit according to  claim 1 , wherein the drive and guiding means comprise a spring configured to act a spring force driving the contact element of the contact unit away from the connector body. 
     
     
         5 . The contact unit according to  claim 1 , wherein the drive and guiding means comprise a further linear bearing and a further axis arranged inside the further bearing and wherein the contact element of the contact unit is arranged between the bearings. 
     
     
         6 . A contact system for an on-load tap changer, comprising:
 a contact unit comprising:
 a connector body and a contact holder coupled to each other, wherein the connector body is configured to connect the contact holder to a contact of the on-load tap changer; 
 a contact element coupled to the contact holder and configured to make electrical contact to a contact element of a contact device for the on-load tap changer; and 
 drive and guiding means coupled to the contact holder such that the contact element is movable driven and linearly guided in a direction away from the connector body, wherein the drive and guiding means comprise at least one linear ball bearing and an axis arranged inside the bearing configured to provide linearly guided movement of the contact element of the contact unit; 
 a further contact holder coupled to the connector body; 
 a further contact element coupled to the further contact holder and configured to make electrical contact to a contact element of a contact device for the on-load tap changer; and 
 further drive and guiding means coupled to the further contact holder such that the further contact element is movable driven and linearly guided in a direction away from the connector body; and 
 wherein the contact holders, the contact elements and the corresponding drive and guiding means are coupled to the connector body such that the directions the corresponding contact elements are movable along enclose a predetermined angle; and 
   a contact device with a contact terminal and a contact element configured to provide power supply due to interaction of the contact elements of the contact unit and the contact device.   
     
     
         7 . The contact system according to  claim 6 , wherein the contact element of the contact device comprises a curved shape and extends along a ring section. 
     
     
         8 . The contact system according to  claim 6 , wherein the contact elements of the contact unit and the contact device comprise a respective contact surface configured to face each other along the direction the contact element of the contact unit is movable. 
     
     
         9 . An on-load tap changer for setting a gear ratio, comprising:
 a rotatable contact ring; and   a contact system comprising:
 a contact unit comprising:
 a connector body and a contact holder coupled to each other, wherein the connector body is configured to connect the contact holder to a contact of the on-load tap changer; 
 a contact element coupled to the contact holder and configured to make electrical contact to a contact element of a contact device for the on-load tap changer; and 
 drive and guiding means coupled to the contact holder such that the contact element is movable driven and linearly guided in a direction away from the connector body, wherein the drive and guiding means comprise at least one linear ball bearing and an axis arranged inside the bearing configured to provide linearly guided movement of the contact element of the contact unit; 
 a further contact holder coupled to the connector body; 
 a further contact element coupled to the further contact holder and configured to make electrical contact to a contact element of a contact device for the on-load tap changer; and 
 further drive and guiding means coupled to the further contact holder such that the further contact element is movable driven and linearly guided in a direction away from the connector body; and 
 wherein the contact holders, the contact elements and the corresponding drive and guiding means are coupled to the connector body such that the directions the corresponding contact elements are movable along enclose a predetermined angle; and 
 
 a contact device with a contact terminal and a contact element configured to provide power supply due to interaction of the contact elements of the contact unit and the contact device, 
   wherein the contact device is configured stationary and the contact unit is connected to the rotatable contact ring such that its contact element is driven and linearly guided in the direction away from the connector body and towards the contact element of the contact device.   
     
     
         10 . The contact system according to  claim 6 , wherein the contact element of the contact unit comprises a rotatable roller to make electrical contact to a contact element of a contact device for the on-load tap changer. 
     
     
         11 . The contact system according to  claim 6 , wherein the contact element of the contact unit comprises a slider to make electrical contact to a contact element of a contact device for the on-load tap changer. 
     
     
         12 . The contact system according to  claim 6 , wherein the drive and guiding means comprise a spring configured to act a spring force driving the contact element of the contact unit away from the connector body. 
     
     
         13 . The contact system according to  claim 6 , wherein the drive and guiding means comprise a further linear bearing and a further axis arranged inside the further bearing and wherein the contact element of the contact unit is arranged between the bearings. 
     
     
         14 . The on-load tap changer according to  claim 9 , wherein the contact element of the contact device comprises a curved shape and extends along a ring section. 
     
     
         15 . The on-load tap changer according to  claim 9 , wherein the contact elements of the contact unit and the contact device comprise a respective contact surface configured to face each other along the direction the contact element of the contact unit is movable. 
     
     
         16 . The on-load tap changer according to  claim 9 , wherein the contact element of the contact unit comprises a rotatable roller to make electrical contact to a contact element of a contact device for the on-load tap changer. 
     
     
         17 . The on-load tap changer according to  claim 9 , wherein the contact element of the contact unit comprises a slider to make electrical contact to a contact element of a contact device for the on-load tap changer. 
     
     
         18 . The on-load tap changer according to  claim 9 , wherein the drive and guiding means comprise a spring configured to act a spring force driving the contact element of the contact unit away from the connector body. 
     
     
         19 . The on-load tap changer according to  claim 9 , wherein the drive and guiding means comprise a further linear bearing and a further axis arranged inside the further bearing and wherein the contact element of the contact unit is arranged between the bearings.