General Electric Company

Ge Energy Power Conversion Technology Gmbh

Otiscelecator Company

Michael Bernhard Kocur

Michael Mann

Owen Jannis Schelenz

Alistair Martin Waddell

Christian Meyer

Thomas Brueckner

Mark Aaron Chan Chan

Stefan Spannhake

Robert Oesterle

Peter Walden

Gunter Blechschmidt

Peter Nadolny

Owen Schelenz

Provided is a premagnetization device for a converter system that is connectable to a three-phase electrical grid that has a three-phase power transformer, a converter connected to the power transformer and a circuit-breaker on the grid side of the power transformer. The premagnetization device is premagnetizes the power transformer in a state isolated from the grid. The premagnetization device uses a single-phase reference voltage (Uref) that has a fixed relationship to the grid voltage (Ugrid) with regard to the voltage parameters, in order to generate, based on the measured instantaneous reference voltage (Uref) and the known fixed parameter relationships, by actuating the converter, a three-phase alternating voltage synchronous to the grid voltage (Ugrid) on the grid side of the power transformer.

Device and method for premagnetization of a power transformer in a converter system

A heat removal assembly for use with a power converter that includes a condenser and an evaporator coupled in flow communication with the condenser. The evaporator is configured to channel working fluid therebetween. The evaporator includes a supply housing, a receiving housing, and at least one expansion housing extending between the supply housing and the receiving housing. The at least one expansion housing includes a flow inlet defined at the supply housing and a flow outlet defined at said receiving housing, and the flow inlet is sized smaller in cross-sectional size than the flow outlet.

Heat removal assembly for use with a power converter

Method for controlling the drive of a conveyor device ( ), especially in the form of an escalator or moving sidewalk, switchable between load operation and no-load operation, having a drive motor ( ) and a frequency changer ( ) controllable at least with respect to frequency and phase position of its output voltage, in which the drive motor ( ) in load operation is fed with a line voltage with essentially constant line frequency and in no-load operation with the frequency changer output voltage, the phase difference between the phase position of the line voltage and the phase position of the frequency changer output voltage is determined, the phase position of the frequency changer output voltage is corrected according to the determined phase difference and therefore essentially brought into agreement with the phase position of the line voltage and switching is produced as soon as this agreement is reached.

Switch over from the mains supply to a frequency converter by a phase correction process for an escalator drive

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Berlin, Germany

Michael Bernhard Kocur