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Ulf Schümann

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international symposium on discharges and electrical insulation in vacuum | 2014

Combined experimental and theoretical study of constriction threshold of large-gap AMF vacuum arcs

Norbert Wenzel; Andreas Lawall; Ulf Schümann; S. Wethekam

High-speed videos of high current large-gap drawn vacuum arcs are compared to 3D ab-initio plasma simulations for different short circuit currents and external axial magnetic fields. In the experiments, defined arc modes and constriction thresholds are observed in quantitative agreement with the simulations. For the diffuse mode at high currents pronounced ring structures in the energy flux to the anode are well reproduced by the theoretical model. A detailed quantitative theoretical understanding of high current large-gap vacuum arcs is concluded.

Archive | 2010

Vacuum switching tube

Roman Renz; Ulf Schümann

Archive | 2008

Vacuum switchgear has housing and contact system with two electrical contact elements, which is connected together by mechanical controller of outside electrical

Ulf Schümann; Andreas Dipl.-Ing. Stelzer

Archive | 2014

Vacuum switching tube, has contact system for switching and/or disrupting current guided over tube and comprising fixed and movable contacts, and conductor element for electrical connection with contacts and arranged in hollow body

Jörg Teichmann; Frank Richter; Ulf Schümann; Frank Graskowski

Archive | 2012

Switching device i.e. load circuit breaker, has drive unit including delay element, where breaker unit is transferable into time window after switching operation while another breaker unit is transferable into closed position

Holger Schumann; Ulf Schümann; Unni Suresh; Jörg Teichmann

Archive | 2008

Procedure for the production of tube shaped component useful as shielding in a vacuum interrupter, comprises filling a section of a tubular cavity of molten form in axial direction with a low melting metal

Klaus Gessner; Ulf Schümann; Andreas Dipl.-Ing. Stelzer

Archive | 2017

tubo de comutação de vácuo.

Roman Renz; Ulf Schümann

Archive | 2017

Elektrische Schaltkammer mit erhöhter dielektrischer Spannungsfestigkeit und deren Herstellungsverfahren

Ulf Schümann; Stephan Wethekam

Archive | 2017

ELECTRICAL SWITCHING DEVICE HAVING PARALLEL SWITCHING PATHS

Karsten Freundt; Hartmut Kaletta; Andreas Malitz; Ulf Schümann; Erik D. Taylor

Archive | 2016

Switching contact of a vacuum interrupter comprising supporting bodies

Frank Graskowski; Ulf Schümann; Uwe Jahnke; Andreas Lawall; Lydia Baron

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Jörg Teichmann

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Frank Graskowski

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Holger Schumann

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Unni Suresh

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Roman Renz

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Andreas Lawall

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Christoph Luft

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Gernot Swiatkowski

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Ludvik Godesa

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Marcel Brzank

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