On-load tap changer, tap-changing transformer for voltage regulation and method for implementing tap changer in the tap-changing transformer

Patent metadata

Field	Value
Publication number	US-2016181024-A1
Application number	US-201414906331-A
Country	US
Kind code	A1
Filing date	Aug 1, 2014
Priority date	Aug 27, 2013
Publication date	Jun 23, 2016
Grant date	—

Abstract

In an on-load tap changer ( 10 ) for controlling voltage of a tapped transformer ( 15 ) it is provided that
the tapped transformer ( 15 ) has at least one regulatable phase ( 16 ) that has a first winding ( 20 ) and a second winding ( 30 ); the first winding ( 20 ) has a regulating winding ( 21 ) with even-numbered winding taps ( 23 ) and a main winding ( 22 ), and the second winding ( 30 ) has a regulating winding ( 31 ) with odd-numbered winding taps ( 33 ) and a main winding ( 32 ); the first winding ( 20 ) and the second winding ( 30 ) having the regulating windings ( 21, 31 ) of the even-numbered and of the odd-numbered winding taps ( 23, 33 ), are inductively coupled; the on-load tap changer ( 10 ) has a selector ( 40 ) for the alternating power-free preselection of the even-numbered or odd-numbered winding taps ( 23, 33 ) to be switched.

First claim

1 . An on-load tap changer for controlling voltage of a tapped transformer wherein
the tapped transformer has at least one regulatable phase that has a first winding and a second winding; the first winding has a regulating winding with even-numbered winding taps identified with even numbers and a main winding; the second winding has a regulating winding with odd-numbered winding taps identified with odd numbers and a main winding; the first winding and the second winding are inductively coupled; the on-load tap changer has a selector for the alternating power-free preselection of the even-numbered or odd-numbered winding taps to be switched.

2 . The on-load tap changer according to the claim 1 wherein
the selector has a first selector part for the regulating winding with the even numbered winding taps and a second selector part for the regulating winding with the odd-numbered winding taps for the power-free preselection of the winding taps to be switched.

3 . The on-load tap changer according to claim 1 , the tap changer comprising
a load diverter switch for carrying out the switching between the even-numbered or the odd-numbered winding taps of the regulating windings preselected load-free by the selector.

4 . The on-load tap changer according to claim 1 wherein
the first selector part has first and second selector arms for the even numbered winding taps;
the second selector part has first and second selector arms for the odd numbered winding taps;
the first selector part is electrically conductively connected with the even-numbered winding taps of the regulating winding of the first winding via step contacts;
the second selector part is electrically conductively connected with the odd-numbered winding taps of the regulating winding of the second winding via step contacts;
each selector arm is electrically conductively connected with respectively one dissipation rail and with respectively one step contact of the corresponding regulating winding;
each dissipation rail is electrically conductively connected with the load diverter switch.

5 . The on-load tap changer according to claim 4 , wherein
the first selector arm of the first selector part is mechanically coupled to the second selector arm of the second selector part; the first selector arm of the second selector part is mechanically coupled to the second selector arm of the first selector part.

6 . The on-load tap changer according to claim 4 , wherein
the first selector arm of the first selector part can be move independently of the second selector arm of the first selector part; the first selector arm of the second selector part can be moved independently of the second selector arm of the second selector part.

7 . The on-load tap changer according to one of claim 4 , wherein
the first selector arm of the first selector part can be moved independently of the first selector arm of the second selector part; the second selector arm of the first selector part can be moved independently of the second selector arm of the second selector part.

8 . The on-load tap changer according to one of claim 4 , wherein
the step contacts connected with the even-numbered winding taps are in a vertical row; the step contacts connected with the odd-numbered winding taps are in a vertical row; the selector arms can be moved linearly vertically.

9 . The on-load tap changer according to claim 4 , wherein
the load diverter switch has a first switching side and a second switching side; the first switching side disconnects or connects the first dissipation rail of the first selector part and the second dissipation rail of the second selector part; the second switching side disconnects or connects the second dissipation rail of the first selector part and the first dissipation rail of the second selector part.

10 . The on-load tap changer according to claim 9 , wherein
each switching side has at least one mechanical switch, two vacuum switching tubes, and one resistor; each mechanical switch is connected in series with a first switching branch with a vacuum switching tube and with a parallel second switching branch with a vacuum switching tube and a resistor connected in series therewith.

11 . The on-load tap changer according to the claim 9 , wherein
each switching side has at least one mechanical switch, two vacuum switching tubes, and one resistor; a first switching branch is connected in parallel to a second switching branch; the first switching branch has a mechanical switch and a vacuum switching tube connected in series; the second switching branch has a mechanical switch, a vacuum switching tube, and a resistor connected in series.

12 . The on-load tap changer according to claim 11 , wherein
each switching side has at least one mechanical switch, two vacuum switching tubes, and one resistor; each mechanical switch is connected in series with a vacuum switching tube and is connected in series with a first switching branch with a resistor and with a second switching branch with a vacuum switching tube; the first and the second switching branch are connected in parallel.

13 . The on-load tap changer according to claim 1 , wherein
each switching side has a permanent main contact that is connected in parallel to the first and second switching branch.

14 . The on-load tap changer according to claim 1 wherein
each switching side has a permanent main contact that directly conductively disconnects from each other or conductively connects with each other the first and the second dissipation rail.

15 . The on-load tap changer according to claim 1 , the tap changer comprising
a motor drive that is coupled to the selector and/or to the load diverter switch; and/or a driven shaft that couples the motor drive to the selector and/or to the load diverter switch; and/or a transmission that couples the motor drive to the driven shaft or to the selector and/or to the load diverter switch; and/or a drive shaft that couples the motor drive to the transmission.

16 . The on-load tap changer according to claim 1 , the tap changer comprising
an electrically insulating post with an upper post end and a lower post end that can be fixed to a base that is at ground potential; wherein the selector is fixed to the upper post end and arranged above the upper post end; and/or the load diverter switch is fixed to the upper post end and arranged above the upper post end, in particular below the selector; and/or the transmission is fixed to the upper post end and arranged above the upper post end, in particular below the selector and/or above the resistors, or fixed to the lower post end and arranged below the lower post end, in particular in the base; and/or the motor drive is fixed to the lower post end and arranged below the lower post end; and/or the drive shaft or the driven shaft runs through the post from the lower post end to the upper post end.

17 . The on-load tap changer according to claim 1 wherein
each resistor is a cast iron resistor.

18 . The on-load tap changer according to claim 1 , the tap changer comprising
a second selector for a second phase to be regulated of the tapped transformer; a third selector for a third phase to be regulated of the tapped transformer; a second load diverter switch that is assigned to the second selector; a third load diverter switch that is assigned to the third selector; wherein the selectors are arranged at the corners of a triangle; the motor drive is coupled to the second and the third se

Assignees

• Reinhausen Maschf Scheubeck

Inventors

• Hammer Christian
• Sachsenhauser Andreas
• Raedlinger Konrad
• Weidinger Max
• Schuster Thomas

Classifications

• H01H9/0011 Primary

  Voltage selector switches · CPC title

• G05F1/147

  with motor driven tap switch · CPC title

• H01H9/0027 Primary

  Operating mechanisms · CPC title

• H01H9/0038

  making use of vacuum switches · CPC title

• H01H9/0016

  Contact arrangements for tap changers · CPC title