DocumentCode :
3129418
Title :
Ground fault detection in NSTX coil power system
Author :
Ramakrishnan, S. ; Neumeyer, C. ; Marsala, R. ; Schneider, H. ; Gernhardt, R. ; Baker, E.
Author_Institution :
Princeton Plasma Phys. Lab., NJ, USA
fYear :
2003
fDate :
14-17 Oct. 2003
Firstpage :
383
Lastpage :
386
Abstract :
The National Spherical Torus Experiment (NSTX) has been designed and installed in the existing facilities at Princeton Plasma Physic Laboratory (PPPL). Most of the hardware, plant facilities, auxiliary sub-systems, and power systems originally used for the Tokamak Fusion Test Reactor (TFTR) have been used with suitable modifications to reflect NSTX needs. The NSTX power system has eleven (11) circuits. Each circuit is a floating DC system. Ground detection and protection device is provided for each circuit. The TFTR ground detection scheme had to be modified for the new application. The coaxial helicity injection system (CHI) requires special scheme to detect grounds in the main power loop since the circuit can be back fed from during neutral beam injection. For CHI, the vacuum vessel is divided into a) inner vessel and b) outer vessel, insulated from one another. Special ground protection devices are being designed for the CHI. An additional system to detect grounds and generate alarms while performing maintenance on the vacuum vessel has also been installed. This was necessary to maintain the insulation integrity of the vessel. Also techniques used to trouble shoot vessel grounds are outlined. This paper describes the changes and addition to the electrical power circuit ground detection and monitoring for the NSTX magnet systems and CHI electrodes.
Keywords :
Tokamak devices; coils; earthing; fault diagnosis; fusion reactor operation; power supplies to apparatus; power supply circuits; power system faults; NSTX coil power system; NSTX magnet systems; National Spherical Torus Experiment; Tokamak Fusion Test Reactor; coaxial helicity injection system; electrical power circuit; electrodes; floating DC system; ground detection scheme; ground fault detection; ground protection device; insulation integrity; main power loop; neutral beam injection; vacuum vessel; vessel grounds; Circuits; Coils; Electrical fault detection; Fusion reactor design; Insulation; Laboratories; Physics; Plasmas; Power system faults; Power system protection;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Fusion Engineering, 2003. 20th IEEE/NPSS Symposium on
Conference_Location :
San Diego, CA, USA
Print_ISBN :
0-7803-7908-X
Type :
conf
DOI :
10.1109/FUSION.2003.1426664
Filename :
1426664
Link To Document :
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