Design and operating experience of a 40 MW, highly-stabilized power supply
- Los Alamos National Lab., NM (United States)
- Florida State Univ., Tallahassee, FL (United States). Nationa High Magnetic Field Laboratory
- ABB Industrial Systems, New Berlin, WI (United States)
- Alpha Scientific Electronics Inc., Hayward, CA (United States)
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.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- National Science Foundation, Washington, DC (United States); Florida State Energy Office, Tallahassee, FL (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 102487
- Report Number(s):
- LA-UR-95-1854; CONF-9510203-3; ON: DE95015254; CNN: Grant DMR 9016241
- Resource Relation:
- Conference: IEEE/Industrial Application Society conference, Orlando, FL (United States), 8-12 Oct 1995; Other Information: PBD: [1995]
- Country of Publication:
- United States
- Language:
- English
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Design and preliminary test results of the 40 MW power supply at the National High Magnetic Field Laboratory
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