Benjamin Baum

Dr.-Ing. Benjamin Baum

New test and measurement techniques for vacuum circuit-breakers at the high voltage level

Project Description

Over the past decades, the vacuum technology has been established in the medium voltage level as the standard switching technology for circuit breakers. This is mainly due to their relatively simple and compact design, their high possible number of current breaking events and the fact that they are virtually maintenance free. Today, the absence of an arc extinction medium like the greenhouse gas SF6 has also turned out to be beneficial. In order to implement this technology at higher voltage levels
(> 52 kV), additional investigations are necessary.

As in almost all mechanical switching devices, after the contact separation, the current, in form of an arc, is extinguished near the current zero crossing. Especially when switching capacitors, when the arc is extinguished, the load is charged to the positive or negative peak value of the supply voltage. As a result, an overvoltage of twice the amplitude appears across the open contacts. During this period, the electric stress in the vacuum bottle may exceed the dielectric strength and causes a breakdown.

Within this research project, the restrike behavior (in general the dielectric performance) of high voltage vacuum interrupters after switching capacitive loads is investigated. For this, a synthetic test circuit (specifications see below), including measurement systems to detect high- and low frequent pre-breakdown currents, will be developed.

  • Test voltage 200 kV (1-cosine shaped)
  • Inrush current up to 20 kA @ 4,25 kHz
  • Breaking current up to 2 kA @ 50 Hz

Teaching

High Voltage Technology I (WS 11/12)

High Voltage Technology II (SS 12)

Electrical Engineering and Information Technology (WS 12/13, WS 13/14, WS 14/15)

Electromagnetic Compatibility (SS 14)

Interdisciplinary Energy Project (SS 15, SS16)

Student Projects and Theses

Open

Finished

Masterthesis: Investigation of the dielectric strength of medium voltage vacuum interrupters when switching capacitive loads

Project seminar: Construction of a solid state tesla coil

Masterthesis: Design of an electromagnet at high voltage potential to influence the trajectory of electrons in vacuum tubes

Bachelorthesis: Investigation into the effect of magnetic fields on the dielectric strength and the emission currents of electrode arrangements in vacuum

Masterthesis: Start-up of a synthetic test circuit to investigate the dielectric strength of a 72.5 kV vacuum interrupter when switching capacitive loads

Bachelorthesis: Determination of the correlation between the restrike behavior of a high voltage vacuum circuit breaker and its kinematic drive chain

Masterthesis: Development of an electrical simulation model of a 72.5 kV vacuum bottle in order to compensate the influence of the test circuit and to optimize the design

Diplomarbeit: Development of a measuring software in Matlab® and LabVIEWTM to analyze test series of a 72.5 kV vacuum bottle

Project seminar: Design and construction of a 200kV switch for precise switching at the voltage zero crossing

Studienarbeit: Elaboration of a testing procedure to systematically analyze the restrike behavior of high voltage vacuum bottles

Bachelorthesis: Development of an electrical simulation model of a 72.5 kV vacuum bottle

Masterthesis: Development of a measurement system to determine the floating potential of the vapor shields of a 72.5 kV vacuum bottle

Diplomarbeit: Assembly and start-up of a synthetic test circuit to investigate the dielectric strength of a 72.5 kV vacuum bottle when switching capacitive loads

Publications

P. Halbach, B. Baum, V. Hinrichsen, K. Ermeler, J. Teichmann
Investigations of Current Instabilities before Current Zero for Typical Load Switching Applications
17th International Symposium on High Voltage Engineering, 22. – 26. August 2011, Hannover, Germany

B. Baum, H. Janssen, V. Hinrichsen
Dielectric testing of HV vacuum interrupters during capacitive current switching.
Abstract & presentation at 4th ITG International Vacuum Electronics Workshop, October 2014, Bad Honnef/Germany

B. Baum, H. Janssen, M. Holbein
Ortung von Emissionsstellen in Vakuum-Schaltrohren
Prior Art Journal, Vol. 21, p. 96, Berlin, 24. Oktober 2014
DOI 10.4421/PAPDEOTT003609

B. Baum, B.Surges, V. Hinrichsen
Dielectric Testing of HV Vacuum Interrupters during Capacitive Current Switching
19th International Symposium on High Voltage Engineering, 23. – 28. August 2015, Pilsen, Czech Republic

H. Janssen, B. Baum, V. Hinrichsen
Non-destructive Measuring Method to Locate Inhomogeneities on a Contact Surface of a Vacuum Circuit Breaker
19th International Symposium on High Voltage Engineering, 23. – 28. August 2015, Pilsen, Czech Republic

Publications

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Springe zu: 2015 | 2014 | 2011
Anzahl der Einträge: 5.

2015

Janssen, H. ; Baum, B. ; Hinrichsen, V. (2015):
Non-destructive measuring method to locate inhomogeneities on a contact surface of a vacuum circuit breaker.
In: 19th International Symposium on High Voltage Engineering (ISH 2015), Pilsen, Tschechien, 23. - 28. August 2015, [Konferenzveröffentlichung]

Baum, B. ; Surges, B. ; Hinrichsen, V. (2015):
Dielectric testing of HV vacuum interrupters during capacitive current switching.
In: 19. ISH 2015, Pilsen, Tschechien, 23. - 28. August 2015, [Konferenzveröffentlichung]

2014

Baum, B. ; Janssen, H. ; Holbein, M. (2014):
Ortung von Emissionsstellen in Vakuum-Schaltrohren.
In: Prior Art Journal, Prior Art Publishing, S. 96, 21, ISSN 2198-4778,
[Online-Edition: http://www.priorartpublishing.com],
[Artikel]

Baum, B. ; Janssen, H. ; Hinrichsen, V. (2014):
Dielectric testing of HV vacuum interrupters during capacitive current switching.
In: 4th ITG International Vacuum Electronics Workshop, Bad Honnef, 12. - 14. Oktober 2014, [Konferenzveröffentlichung]

2011

Halbach, Patrick ; Baum, B. ; Hinrichsen, V. ; Ermeler, K. ; Teichmann, J. (2011):
Investigations of Current Instabilities before Current Zero for Typical Load Switching Applications.
In: Book of abstract / ISH 2011 : August, 22 - 26, 2011, Hannover, Germany / 17th International Symposium on High Voltage Engineering. Ed.: Ernst Gockenbach.-Berlin: VDE-Verl.,2011.-ISBN 978-3-8007-3364-4, [Buchkapitel]

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