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Title: Protection of the MFTF accel power supplies

Abstract

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.

Authors:
;
Publication Date:
Research Org.:
Aydin Energy Div., Palo Alto, CA (USA)
OSTI Identifier:
5677663
Report Number(s):
UCRL-82950; CONF-791102-112
TRN: 80-006372
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: 8. symposium on engineering problems of fusion research, San Francisco, CA, USA, 13 Nov 1979
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; NEUTRAL BEAM SOURCES; POWER SUPPLIES; SAFETY; CIRCUIT BREAKERS; FAILURES; MFTF DEVICES; TRANSFORMERS; ELECTRICAL EQUIPMENT; ELECTRONIC EQUIPMENT; EQUIPMENT; EQUIPMENT PROTECTION DEVICES; MAGNETIC MIRRORS; OPEN PLASMA DEVICES; THERMONUCLEAR DEVICES; 700203* - Fusion Power Plant Technology- Power Supplies, Energy Storage; 700205 - Fusion Power Plant Technology- Fuel, Heating, & Injection Systems

Citation Formats

Wilson, J H, and Wood, J C. Protection of the MFTF accel power supplies. United States: N. p., 1979. Web.
Wilson, J H, & Wood, J C. Protection of the MFTF accel power supplies. United States.
Wilson, J H, and Wood, J C. Mon . "Protection of the MFTF accel power supplies". United States. https://www.osti.gov/servlets/purl/5677663.
@article{osti_5677663,
title = {Protection of the MFTF accel power supplies},
author = {Wilson, J H and Wood, J C},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/5677663}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1979},
month = {11}
}

Conference:
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