Protection of the MFTF accel power supplies

Conference · Mon Nov 12 04:00:00 EST 1979

OSTI ID:5677663

Wilson, J H; Wood, J C

The MFTF experiment's Sustaining Neutral Beam Power Supply System (SNBPSS) includes twenty-four 95 kV, 80 A accel dc power supplies (ADCPS). Each power supply includes a relatively high-impedance (20 percent) rectifier transformer and a step voltage regulator with a 50-100 percent voltage range. With this combination, the fault current for some postulated faults may be lower than the supply's full load current at maximum voltage. A design has been developed which uses protective relays and current-limiting fuses coordinated to detect phase and ground faults, DC faults, incorrect voltage conditions, rectifier faults, power factor correction capacitor faults, and overloads. This unusual solution ensures fast tripping on potentially destructive high-current faults and long-time delays at lower currents to allow 30 second pulse operation. The ADCPS meets the LLL specification that all major assemblies be self-protecting, that is, able to sustain external faults without damage to minimize damage due to internal faults.

• Research Organization: Aydin Energy Div., Palo Alto, CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5677663
• Report Number(s): UCRL-82950; CONF-791102-112
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700203* -- Fusion Power Plant Technology-- Power Supplies
Energy Storage
700205 -- Fusion Power Plant Technology-- Fuel
Heating
& Injection Systems
CIRCUIT BREAKERS
ELECTRICAL EQUIPMENT
ELECTRONIC EQUIPMENT
EQUIPMENT
EQUIPMENT PROTECTION DEVICES
FAILURES
MAGNETIC MIRRORS
MFTF DEVICES
NEUTRAL BEAM SOURCES
OPEN PLASMA DEVICES
POWER SUPPLIES
SAFETY
THERMONUCLEAR DEVICES
TRANSFORMERS