US 11,177,086 B2Granted

On-load tap changer, regulating transformer with on-load tap changer, and method for connecting an on-load tap changer

AssigneeMaschinenfabrik Reinhausen GmbH

InventorsAndreas Stocker, Marco Hoerl, Christian Hammer

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Abstract

An on-load tap changer includes: a fine selector, including: fixed contacts having a commutation contact, connectable with a main winding, and tap contacts, connectable with an associated tap of regulating windings; first and second arms that selectably contact the fixed contacts; a preselector, switchable between first and second settings, connectable with the regulating and main windings, and having: first, second, and third preselector fixed contacts, connectable in the first setting with the first preselector fixed contact and in the second setting with the second preselector fixed contact; and a load changeover switch, switchable between first and second changeover settings, and including: a first terminal connected with the first arm, a second terminal connected with the second arm, and a diverter line connected in the first changeover setting with the first terminal and in the second changeover setting with the second terminal.

Claims13

Dependent claims

A method for switching an on-load tap changer, wherein the on-load tap changer comprises:

a fine selector, which comprises:
a plurality of selector fixed contacts comprising a commutation contact, which is connectable with a main winding of a regulating transformer, and a plurality of tap contacts, which are respectively connectable with an associated tap of a regulating winding of the regulating transformer;
a first selector arm, which is configured to selectably contact each of the selector fixed contacts;
and
a second selector arm, which is configured to selectably contact each of the selector fixed contacts;
a preselector, which is switchable over from a first setting to a second setting, and conversely, which is connectable with the regulating winding and the main winding, and which comprises:
a first preselector fixed contact,
a second preselector fixed contact, and
a third preselector fixed contact, which is connected in the first setting with the first preselector fixed contact, and in the second setting, connected with the second preselector fixed contact;
and
a load changeover switch, which is switchable over from a first changeover setting to a second changeover setting, and conversely, and which comprises:
a first terminal connected with the first selector arm,
a second terminal connected with the second selector arm, and
a diverter line connected in the first changeover setting with the first terminal and in the second changeover setting with the second terminal;
wherein the method comprises, when the preselector is to be switched over, then:
the first selector arm and the second selector arm are set in such a way that one of the first selector arm or the second selector arm contacts the commutation contact and the other one of the first selector arm or the second selector arm does not contact any of the tap contacts, and
switching over of the load changeover switch begins before switching over of the preselector has ended.

14 more elements

An on-load tap changer for a regulating transformer, the on-load tap changer comprising:

a fine selector, which comprises:
a plurality of selector fixed contacts comprising a commutation contact, which is connectable with a main winding of the regulating transformer, and a plurality of tap contacts, which are respectively connectable with an associated tap of a regulating winding of the regulating transformer;
a first selector arm, which is configured to selectably contact each of the selector fixed contacts;
and
a second selector arm which is configured to selectably contact each of the selector fixed contacts;
a preselector, which is switchable over from a first setting to a second setting, and conversely, which is connectable with the regulating winding and the main winding, and which comprises:
a first preselector fixed contact,
a second preselector fixed contact, and
a third preselector fixed contact, which is connected in the first setting with the first preselector fixed contact, and which is connected in the second setting with the second preselector fixed contact;
a load changeover switch, which is switchable over from a first changeover setting to a second changeover setting, and conversely, and which comprises:
a first terminal connected with the first selector arm,
a second terminal connected with the second selector arm, and
a diverter line connected in the first changeover setting with the first terminal and in the second setting with the second terminal;
and
a common drive shaft for the preselector, the fine selector, and the load changeover switch,
wherein the preselector, the fine selector, and the load changeover switch are each separately coupled to the drive shaft,
wherein the preselector comprises a preselector base plate with a first side and a second, opposite side, and
wherein the drive shaft extends through the preselector base plate and is rotatably mounted thereon.

15 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/333,598Filed 7 Sep 2017
Priority: DE 10 2016 117 526.916 Sep 2016
Published: US 2019/0228922 A125 Jul 2019
Granted: 16 Nov 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H01H 9/0016
Tap change devices: contact arrangements for tap changers
H01F 29/04
With tappings on coil or winding; with provision for rearrangement or interconnection of windings: having provision for tap-changing without…
H01H 9/0027
Tap change devices: operating mechanisms
H01H 9/0033
Operating mechanisms: with means for indicating the selected tap or limiting the number of selectable taps