On-load tap changer

Patent metadata

Field	Value
Publication number	US-9762161-B2
Application number	US-201314382327-A
Country	US
Kind code	B2
Filing date	Mar 25, 2013
Priority date	Apr 20, 2012
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

An on-load tap changer for uninterrupted switching between different winding taps of a tapped transformer has a plurality of fixed selector contacts electrically connected with the individual winding taps, arranged in a line, and actuatable by two longitudinally displaceable movable selector contacts. Two vacuum interrupters serve for the uninterrupted switching of each phase. A motor drive actuates the on-load tap changer. The entire load changeover switch is arranged by a transmission module on the underside of a transformer cover.

First claim

The invention claimed is:

1. An on-load tap changer for uninterrupted switching between different winding taps of a tapped transformer, wherein
at least one selector contact unit has a plurality of fixed selector contacts that are arrayed along a line and each electrically connected with a respective one of the winding taps,
the fixed selector contacts are actuatable by two longitudinally displaceable movable selector contacts,
for the uninterrupted switching, two vacuum interrupters are provided for each phase as well as a motor drive for introducing a drive movement into the on-load tap changer,
the on-load tap changer is supported by a transmission module on an underside of a transformer cover,
a rotational movement generated by the motor drive is transmissible by the transmission module to a threaded spindle engaged with a spindle nut provided at a center slide carriage so as to longitudinally displace the center slide carriage along guide rods,
other slide carriages are operatively connected with the center slide carriage by a similarly longitudinally displaceable guide link that is mechanically coupled with the center slide carriage, so that the remaining slide carriages in turn are so mechanically coupled with the center slide carriage by the guide link that not only the selector contact units, but also the vacuum interrupters for the uninterrupted load switching are thereby simultaneously actuatable.

2. The on-load tap changer according to claim 1 , wherein the transmission module comprises a flange-like sealing module.

3. The on-load tap changer according to claim 1 , wherein a support plate of a dielectric material has a first side provided with the at least one selector contact unit and at a second side provided with switching means for the uninterrupted switching.

4. The on-load tap changer according to claim 3 , wherein each slide carriage is supported by two parallel arranged guide rods that are in turn mounted on the support plate by cross members.

5. The on-load tap changer according to claim 3 , wherein the movable selector contacts are each received in a contact support and cooperate with fixed selector contacts arranged at the support plate.

6. The on-load tap changer according to claim 1 , wherein the at least one selector contact unit comprises a slide carriage, a contact support and movable selector contacts that cooperate with at least one fixed selector contact.

7. The on-load tap changer according to claim 1 , wherein the at least one selector contact unit is displaceable along the guide rods by the respective slide carriage such that it is able to run through a regulating range of the on-load tap changer.

8. The on-load tap changer according to claim 1 , wherein the movable selector contacts of a phase in each stationary operational setting connect at least one of the fixed selector contact of the same phase of the on-load tap changer.

9. The on-load tap changer according to claim 1 , wherein two of the movable selector contacts are resiliently mounted in a contact support.

10. The on-load tap changer according to claim 1 , wherein
a movable switch contact of each of the vacuum interrupters is pivotably and mechanically operatively connected with a coupling element and a control lever,
provided at a pivotable connection between the corresponding coupling element and the control lever on a side facing the support plate is a roller that rolls along a profiled upper side of a guide link under partially maintained contact so that the respective vacuum interrupter is operable by a longitudinal displacement of the guide link in dependence on the profiling of the upper side thereof.

11. The on-load tap changer according to claim 1 , wherein the fixed selector contacts are mounted on a contact strip fastened to a support plate by respective spacers.

12. The on-load tap changer according to claim 1 , wherein the motor drive drives not only a threaded spindle that in turn is operatively connected with the selector contact unit, but also a camshaft that actuates the switching means for the uninterrupted switching in such a manner that both the movable switching contacts and the vacuum interrupters for the uninterrupted switching are thereby actuated.

13. The on-load tap changer according to claim 1 , for use in voltage regulation of a distributing transformer.

14. An on-load tap changer for uninterrupted switching between different winding taps of a tapped transformer, wherein
at least one selector contact unit has a plurality of fixed selector contacts that are arrayed in a line and each electrically connected with a respective one of the winding taps,
the fixed selector contacts are actuatable by two longitudinally displaceable movable selector contacts,
for the uninterrupted switching, two vacuum interrupters are provided for each phase as well as a motor drive for introducing a drive movement into the on-load tap changer,
the on-load tap changer is supported by a transmission module carried on an underside of a transformer cover,
each slide carriage is supported by two parallel arranged guide rods that are in turn mounted on the support plate by cross members,
the cross-members form a mechanical abutment for the at least one selector contact unit that is displaceable along the guide rods in such a way that a regulating range of the on-load tap changer is mechanically limited.

15. An on-load tap changer for uninterrupted switching between different winding taps of a tapped transformer, wherein
at least one selector contact unit has a plurality of fixed selector contacts that are arrayed along a line and each electrically connected with a respective one of the individual winding taps,
the fixed selector contacts are actuatable by two longitudinally displaceable movable selector contacts,
for the uninterrupted switching, two vacuum interrupters are provided for each phase as well as a motor drive for introducing a drive movement into the on-load tap changer,
the on-load tap changer is carried by a transmission module mounted on an underside of a transformer cover,
the fixed selector contacts are mounted on a contact strip fastened to a support plate by respective spacers,
the contact strip has at its longitudinal side a control link having two sides each provided with several lobes.

16. An on-load tap changer for uninterrupted switching between different winding taps of a tapped transformer, wherein
at least one selector contact unit with a plurality of fixed selector contacts that are arrayed along a line and each electrically connected with a respective one of the individual winding taps,
the fixed selector contacts are actuatable by two longitudinally displaceable movable selector contacts,
for the uninterrupted switching, two vacuum interrupters are provided for each phase as well as a motor drive for introducing a drive movement into the on-load tap changer,
the on-load tap changer is carried by a transmission module mounted on an underside of a transformer cover,
the fixed selector contacts are mounted on a contact strip fastened to a support plate by respective spacers,
the contact strip has at its longitudinal side a control link having two sides each provided with several lobes,
a profile of the lobes is so dimensioned that the movable selector contacts of the corresponding selector contact unit between two adjacent fixed selector contacts lift off the currently connected fixed selector contact, since the movable selector contacts again connect the next fixed selector contact after switching has been completed.

17. An on-load

Assignees

• Pankofer Martin
• Stocker Andreas
• Reinhausen Maschf Scheubeck

Inventors

• Pankofer Martin
• Stocker Andreas

Classifications

• H02P13/06 Primary

  by tap-changing; by rearranging interconnections of windings · CPC title

• H01H9/0027

  Operating mechanisms · CPC title

• H01F29/04

  having provision for tap-changing without interrupting the load current · CPC title

• H01H33/666

  Operating arrangements · CPC title

• H01H9/0038 Primary

  making use of vacuum switches · CPC title