Abb Research Ltd.

Abb Power Grids Switzerland Ag

Hitachi Energy Switzerland Ag

Torbjörn Wass

Tord Bengtsson

Manoj Pradhan

Göran Eriksson

Goran Eriksson

The present disclosure relates to a cable for a high voltage winding of an electromagnetic induction device. The cable includes a conductor having a width w, and a shield arranged around at least a portion of the conductor, wherein in any cross-section of the conductor the conductor has rounded corners with a radius r in the range w/5&#x3c;r&#x2264;w/3. A high voltage electromagnetic induction device having a cable forming a high voltage winding is also disclosed.

High voltage cable for a winding and electromagnetic induction device comprising the same

A method and a device for estimating the winding clamping force on a winding package of a transformer or a reactor, the winding package comprising at least one winding with connections and an iron core. The device includes a current pulse generator configured to generate a current pulse sufficient to excite the winding, means for supplying the current pulse to the winding, a sensor for measuring vibrations of the transformer or the reactor generated by the current pulse, and a computing unit configured to calculate a mechanical resonant frequency based on the measured vibrations and to estimate the clamping forces on the winding packages based on the calculated mechanical resonant frequency and a predetermined relation between the expected mechanical resonant frequency and the clamping force.

Method and device for estimating the clamping force on a winding package of a transformer or a reactor

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Västerås, Sweden

Torbjörn Wass