Design and preliminary test results of the 40 MW power supply at the National High Magnetic Field Laboratory

Author

Boenig, Heinrich J. ; Bogdan, Ferenc ; Morris, G.C. ; Ferner, James A. ; Schneider-Muntau, Hans J. ; Rumrill, Ronald H. ; Rumrill, Roonal H.

Author_Institution

Nat. High Magnetic Field Lab., Los Alamos Nat. Lab., NM, USA

Volume

30

Issue

4

fYear

1994

fDate

7/1/1994 12:00:00 AM

Firstpage

1774

Lastpage

1777

Abstract

Four highly stabilized, steady-state, 10 MW power supplies have been installed at the National High Magnetic Field Laboratory in Tallahassee, FL. Each supply consists of a 12.5 kV vacuum circuit breaker, two three-winding, step-down transformers, a 24-pulse rectifier with interphase reactors and freewheeling diodes, and a passive and an active filter. Two different transformer tap settings allow DC supply output voltages of 400 and 500 V. The rated current of a supply is 17 kA and each supply has a one hour overload capability of 20 kA. The power supply output bus system, including a reversing switch at the input and 2×16 disconnect switches at the output, connects each supply to 16 different magnet cells. The design of the power supply is described and preliminary test results with a supply feeding a 10 MW resistive load are presented

Keywords

active filters; circuit breakers; electromagnets; passive filters; power supplies to apparatus; power transformers; rectifiers; vacuum insulation; 10 MW; 12.5 kV; 17 kA; 20 kA; 24-pulse rectifier; 40 MW; 400 V; 500 V; DC supply output voltages; National High Magnetic Field Laboratory; active filter; disconnect switches; electromagnets; freewheeling diodes; high field magnet; highly stabilized steady-state; interphase reactors; magnet cells; overload capability; passive filter; power supply; power supply output bus; preliminary test results; rated current; resistive load; reversing switch; three-winding step-down transformers; transformer tap settings; vacuum circuit breaker; Circuit breakers; Circuit testing; Laboratories; Magnetic fields; Magnetic switching; Power supplies; Rectifiers; Steady-state; Switches; Transformers;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.305601

Filename

305601