Abb Research Ltd.

Abb Technology Ltd

Hitachi Energy Switzerland Ag

Abb Schweiz Ag

Abb Power Grids Switzerland Ag

Jean Mathae

Tommy Larsson

Richard Mannerbro

Lahan Konov

Martin Perols

Håkan Blomquist

Lars G Eriksson

Tommy Fräsén

Helge Österholm

Jan Ekengren

A spring unit includes a mechanical spring means having a spring direction and being located between a first spring support and a second spring support, which first and second spring supports are movable in relation to each other in the spring direction. The spring unit further includes a first actuation member facing the rear side of the first spring support and a second actuation member facing the rear side of the second spring support, which first and second actuating members are movable relative to each other and relative to the first and second spring supports in the spring direction.

Spring unit and a diverter switch

A gearbox for a tap changer. The gearbox has an input drive shaft arranged to be connected to a motor. The gearbox also has a diverter switch drive output with a diverter shaft. The diverter switch drive output is arranged to be connected for actuation of breakers in a diverter switch of the tap changer. The gearbox further has first and second selector arm drive outputs arranged for actuation of a tap selector of the tap changer. It also has reduction gear means connecting the input drive shaft to the diverter switch drive output and to each of the selector arm drive outputs. Further the gearbox has timing connection means arranged to connect the reduction gear means to each of the selector arm drive outputs. The invention also relates to a tap changer having such a gearbox and to a transformer provided with such a tap changer.

Gearbox for a tap changer, a tap changer and a transformer

A tap changer for connection to a regulating winding of a rated regulation voltage is provided. The tap changer having a linear tap selector having at least one current collector and a linear arrangement of fixed contacts. Tap changer further includes a shielding structure arranged to shield the tap selector from an external electrical field. The shielding structure includes: a first shielding part arranged to be electrically connected to a current collector; and a second shielding part formed at least partly by the fixed contacts. The first and second shielding parts are separated so that the distance between the first and second shielding parts reaches or exceeds the rated regulating voltage insulation distance of the tap changer.

Tap changer

Growing community of inventors

Ludvika, Sweden

Jean Mathae