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-9941064-B2
Application number	US-201414906331-A
Country	US
Kind code	B2
Filing date	Aug 1, 2014
Priority date	Aug 27, 2013
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

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

The invention claimed is:

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;
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;
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 regulating winding has a respective dissipation rail;
each selector arm is electrically conductively connected with the respective dissipation rail and with the respective step contact of the corresponding regulating winding; and
each dissipation rail is electrically conductively connected with a load-diverter switch between the even-numbered or the odd-numbered winding taps of the regulating windings.

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

3. The on-load tap changer according to claim 1 , wherein
the first selector arm of the first selector part is mechanically coupled to the second selector arm of the second selector part; and
the first selector arm of the second selector part is mechanically coupled to the second selector arm of the first selector part.

4. The on-load tap changer according to claim 1 , wherein
the first selector arm of the first selector part can move independently of the second selector arm of the first selector part; and
the first selector arm of the second selector part can moved independently of the second selector arm of the second selector part.

5. The on-load tap changer according to claim 1 , wherein
the first selector arm of the first selector part can moved independently of the first selector arm of the second selector part; and
the second selector arm of the first selector part can moved independently of the second selector arm of the second selector part.

6. The on-load tap changer according to claim 1 , 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; and
the selector arms can be moved linearly vertically.

7. The on-load tap changer according to claim 1 , 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; and
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.

8. The on-load tap changer according to claim 7 , wherein
each switching side has at least one mechanical switch, two vacuum switching tubes, and one resistor; and
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.

9. The on-load tap changer according to claim 8 , wherein
each switching side has a permanent main contact connected in parallel to the first and second switching branch.

10. The on-load tap changer according to the claim 7 , 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; and
the second switching branch has a mechanical switch, a vacuum switching tube, and a resistor connected in series.

11. The on-load tap changer according to claim 10 , 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; and
the first and the second switching branch are connected in parallel.

12. The on-load tap changer according to claim 7 , 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.

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

14. 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 at ground potential;
wherein
the selector is fixed to the upper post end and arranged above the upper post end; or
the load-diverter switch is fixed to the upper post end and arranged above the upper post end, in particular below the selector; or
the transmission is fixed to the upper post end and arranged above the upper post end, in particular below the selector or above the resistors, or fixed to the lower post end and arranged below the lower post end, in particular in the base; or
the motor drive is fixed to the lower post end and arranged below the lower post end; or
the drive shaft or the driven shaft runs through the post from the lower post end to the upper post end.

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

16. 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 assigned to the second selector;
a third load-diverter switch assigned to the third selector;
wherein
the selectors are arranged at corners of a triangle;
the motor drive is coupled to the second and the third selector or to the second and the third load-diverter switch.

17. A tapped transformer for voltage regulation t

Assignees

• Reinhausen Maschf Scheubeck

Inventors

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

Classifications

• H01F29/02

  with tappings on coil or winding; with provision for rearrangement or interconnection of windings · CPC title

• H01H9/0016

  Contact arrangements for tap changers · CPC title

• H01H9/0038

  making use of vacuum switches · CPC title

• H01H9/0011 Primary

  Voltage selector switches · CPC title

• G05F1/147

  with motor driven tap switch · CPC title