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In the power system, neutral grounding is usually adopted in small current neutral grounding system whose voltage grade does not exceed 60kV. In this way, if a single-phase ground fault occurs, due to that line voltage is still symmetric and fault-phase grounding current is very small, this system can still run 1 to 2 hours to improve the power supply reliability. However, in order to prevent the...
The scale of medium voltage networks have been expanding and cables are increasingly used so that nowadays capacitance currents are much greater than before when single line-to-ground faults happen. And the harm of an arcing ground overvoltage is extremely severe in an ungrounded system. To solve the problem put forward, the neutral of a medium voltage network is grounded with petersen coils or low...
In this paper, firstly, ITER power supply and its AC/DC converter in 2001 design have been introduced. Some import criteria such as FSC and internal bypass are reviewed and researched. The system overvoltage and low frequency oscillation have also been studied. Then some proposals to improve the ITER design and baseline have been presented, and these proposals have been validated and supported by...
NSTX at Princeton Plasma Physics Laboratory (PPPL) requires sophisticated plasma positioning control system for stable plasma operation. TF magnetic coils and PF magnetic coils provide electromagnetic fields to position and shape the plasma vertically and horizontally respectively. NSTX utilizes twenty six coil power supplies to establish and initiate electromagnetic fields through the coil system...
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