Hitachi Energy Switzerland Ag

Abb Schweiz Ag

Abb Technology Ag

Filip Grecki

Wojciech Piasecki

Magdalena Ostrogorska

Krzysztof Obrebski

Marcin Czopek

Pawel Aloszko

Didier Cottet

Max Claessens

Marek Fulczyk

Przemyslaw Balcerek

Bernhard Wunsch

Pawel Klys

Arne Schroeder

Radoslaw Jez

Lukasz Bachorz

Marcin Szewczyk

Witold Sobczak

Torsten Nilsson

Krzystof Obrebski

A converter apparatus includes a string of electrically interconnected modules that includes a first group of modules comprising a first module and a second group of modules comprising a second module. A first screen is connected to a first defined electric potential and is located adjacent the first group of modules and a second screen is connected to a second defined electric potential and is located adjacent the second group of modules. During operation of the converter apparatus a resonance loop is created from the first module via the first and second screens and the second module back to the first module. A damping unit is located in the resonance loop and is set to dampen electromagnetic noise.

Converter arrangement

The subject of the present application is a cover for distribution transformer filled with a dielectric liquid, equipped with electronic device integrated with the cover which is applied for transmission and distribution of electric energy. The cover is characterized in that the electronic device is immersed in the dielectric liquid filling a cooling compartment fixed on the cover; the cooling compartment has side walls, a top wall and a bottom wall which bottom wall is matched in the window made in the cover and the bottom wall forms a thermal barrier between the interior of the electric power device and the interior of the cooling compartment and the both interiors of the cooling compartment and of the electric power device are hermetically closed together.

Cover for a distribution transformer filled with a dielectric liquid

The subject of the application is a power electronic tap changer module for transformer using power electronic elements connected to sections of a primary winding of the transformer. The power electronic tap changer module is equipped with valves having a pair of a thyristor or transistors connected with a controller and the valves are connected in series with the fuses, respectively. The module is equipped with an additional oversized tap line having an oversized valve rated for short circuit current, which valve is connected with an overvoltage triggering circuit. The oversized valve is equipped with a pair of thyristor or transistors connected with a thermally protected voltage suppressing device.

Power electronic tap changer module for transformer

The invention relates to a device for measuring the direct component of alternating current, applicable in current measuring systems where a low direct component of alternating current and a high amplitude of the alternating component of alternating current occur. The device for measuring the direct component of alternating current comprises a current-carrying wire () around which there is located a magnetic core () provided with a gap () in which a magnetic field sensor () with insulated terminals () is located and it comprises a shorted compensating winding () or () which is made in the form of a single turn coil placed on the core ().

Device for measuring the direct component of alternating current

Growing community of inventors

Cracow, Poland

Filip Grecki