Design and operating experience of a 40 MW, highly-stabilized power supply

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Four 10 MW, highly-stabilized power supply modules have been installed at the National High Magnetic Field Laboratory in Tallahassee, FL, to energize water-cooled, resistive, high-field research magnets. The power supply modules achieve a long term current stability if 10 ppM over a 12 h period with a short term ripple and noise variation of <10 ppM over a time period of one cycle. The power supply modules can operate independently, feeding four separate magnets, or two, three or four modules can operate in parallel. Each power supply module consists of a 12.5 kV vacuum circuit breaker, two three-winding, step-down transformers, ... continued below

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15 p.

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Boenig, H.J.; Ferner, J.A.; Bogdan, F.; Morris, G.C. & Rumrill, R.S. July 1, 1995.

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  • Boenig, H.J. Los Alamos National Lab., NM (United States)
  • Ferner, J.A. Florida State Univ., Tallahassee, FL (United States). Nationa High Magnetic Field Laboratory
  • Bogdan, F.
  • Morris, G.C. ABB Industrial Systems, New Berlin, WI (United States)
  • Rumrill, R.S. Alpha Scientific Electronics Inc., Hayward, CA (United States)

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Description

Four 10 MW, highly-stabilized power supply modules have been installed at the National High Magnetic Field Laboratory in Tallahassee, FL, to energize water-cooled, resistive, high-field research magnets. The power supply modules achieve a long term current stability if 10 ppM over a 12 h period with a short term ripple and noise variation of <10 ppM over a time period of one cycle. The power supply modules can operate independently, feeding four separate magnets, or two, three or four modules can operate in parallel. Each power supply module consists of a 12.5 kV vacuum circuit breaker, two three-winding, step-down transformers, a 24-pulse rectifier with interphase reactors, and a passive and an active filter. Two different transformer tap settings allow rated dc supply output voltages of 400 and 500 V. The rated current of a supply module is 17 kA and each supply module has a one-hour overload capability of 20 kA. The isolated output terminals of each power supply module are connected to a reversing switch. An extensive high-current bus system allows the modules to be connected to 16 magnet cells. This paper presents the detailed design of the power supply components. Various test results taken during the commissioning phase with a 10 MW resistive load and results taken with the research magnets are shown. The effects of the modules on the electrical supply system and the operational behavior of the power factor correction/harmonic filters are described. Included also are results of a power supply module feeding a superconducting magnet during quench propagation tests. Problems with the power supply design and solutions are presented. Some suggestions on how to improve the performance of these supplies are outlined.

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15 p.

Notes

OSTI as DE95015254

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  • IEEE/Industrial Application Society conference, Orlando, FL (United States), 8-12 Oct 1995

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  • Other: DE95015254
  • Report No.: LA-UR--95-1854
  • Report No.: CONF-9510203--3
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 102487
  • Archival Resource Key: ark:/67531/metadc624634

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • July 1, 1995

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • Aug. 24, 2016, 1:38 p.m.

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Boenig, H.J.; Ferner, J.A.; Bogdan, F.; Morris, G.C. & Rumrill, R.S. Design and operating experience of a 40 MW, highly-stabilized power supply, article, July 1, 1995; New Mexico. (digital.library.unt.edu/ark:/67531/metadc624634/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.