Abb Technology Ag

Hitachi Energy Switzerland Ag

Abb Schweiz Ag

Abb Power Grids Switzerland Ag

Georges Dormia

Toufann Chaudhuri

Philippe Stefanutti

Harry Zueger

Yann Cuenin

Nicolas Hugo

Bernard Descollaz

Lakhdar Gaoua

Lorenzo Dus

Vincent Brungard

A transformer assembly with shrinkage compensation during drying or curing of the windings including: a core having two yokes and two legs, a winding provided about at least one of the two legs of the core, the winding being insulated by an insulating material, a metal profile per yoke, extending in parallel to the respective yoke and being mounted to it, and two pistons seated in the metal profiles, the pistons being movable along their axial direction which is parallel to the longitudinal axis of the at least one winding, wherein the at least two pistons exert a force on the at least one winding in an axial direction of the windings.

Transformer assembly with shrinkage compensation

The present disclosure is concerned with a multilevel converter including a transformer arrangement comprising at least two transformer units, each with primary and secondary windings and a transformer core structure. The latter are merged into one shared transformer core comprising at least one return limb that is part of the closed magnetic flux paths of the at least two transformer units. Sharing return limbs among individual transformer units, in particular when fed with primary voltage signals that have a certain phase shift between each other, helps to reduce the volume and weight as compared to an individual transformer core structure for each of the transformer units. The multilevel converter is beneficially used in railway traction applications.

Multilevel converter and method of converting a supply voltage

Growing community of inventors

Douvaine, France

Georges Dormia