Abb Research Ltd.

Abb Ab

Hygienteknik Sverige Ab

Stefan G Johansson

Udo Fromm

Sture Lindahl

Mats Leijon

Jan Svensson

Tord Bengtsson

Willy Hermansson

Gunnar Russberg

Christian Sasse

Lennart Ängquist

Marek Fulczyk

Gabriel Olguin

Thorsten Shütte

Magnus Callavik

In a mop head () having a handle attachment () that is displaceable along a frame (), the handle attachment has a slider () that is displaceable (direction S) in a guide groove () in the frame. The slider has at least one engagement surface for frictional engagement with a respective cooperating surface of the guide groove and biasing means that with a force bias the surface/-s of the slider against the cooperating surface/-s of the guide groove. The handle attachment with the slider are depressable against the force from the biasing means, for relieving the engagement between the surface/-s of the slider and of the guide groove.

Displaceable attachment

A power compensator for an electric power transmission line. The power compensator includes a voltage source converter, a capacitor and an energy storage device. The energy storage device includes a high voltage battery having a short circuit failure mode, a first main switch and second main switch for disconnecting the battery from the capacitor, and a control unit for operating the first and second switch.

Power compensator and method for providing a black start with that compensator

A high voltage AC transmission cable system for transmitting power between two points, each connected to one or more power networks, and a method to operate the system. At least one transformer is arranged at each end of the AC transmission cable, wherein at least one of the transformers is arranged to operate the transformer at a voltage whereby losses due to reactive power transport and dielectric losses are minimized. The AC cable is run at a variable voltage regulated such that the voltage is a function of the load for the transmission cable. This operating voltage is not necessarily the same as the nominal voltages in the connection points. A control and communication system and a graphical user interface for carrying out the method are also provided.

System for transmission of electric power

The present invention relates to a ground fault detection arrangement for a synchronous three-phase electrical machine, and an electrical system comprising a ground fault detection arrangement and a synchronous three-phase electrical machine. The ground fault detection arrangement injects an off-nominal frequency voltage between a neutral point of the synchronous three-phase electrical machine and ground and measure resultant currents to detect a ground fault.

Ground fault detection

A rotating asynchronous converter and a generator device having a first stator connected to a first AC network with a first frequency f, and a second stator connected to a second AC network with a second frequency f. The converter has a rotor which rotates in dependence of the first and second frequencies f, f. The stators each have at least one winding formed of at least one current-carrying conductor, and an insulation system, formed of semiconducting layers each forming an equipotential surface, and a solid insulation between the semiconducting layers.

Rotating asynchronous converter

Growing community of inventors

Vasteras, Sweden

Stefan G Johansson