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Analysis and Solution Proposal for Improving the Resiliency of High Voltage Cathode Power Supply

Pouresmaeil, Kaveh | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51318 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Kaboli, Shahriyar; Safdarian, Amir
  7. Abstract:
  8. High voltage power supplies (HVPS) are widely used to supply the vacuum tubes. The function of this power supply is disturbed by some internal and external faults. One of the external faults is the arc fault in the tube. The amount of delivered energy from the HVPS to the tube is an important issue during the arc fault in the tube. The conventional protection mechanism consists of a shunt crowbar device which divert the fault current from the tube arc. The crowbar circuit is usually built with thyristor in most cases. This type of crowbar cannot be turned off simply by protection command. It is a drawback since if the fault is transient such as arc in the load or false fault detection is occurred due to noise, the output of the power supply is shortened for a long time. Thus, the restoration time of these power supplies is excessive. In this thesis, IGBT based crowbar device is studied to overcome this issue. In the proposed protection mechanism crowbar device can be reopened intentionally after closing. Another type of the fault is tinternal fault, one of the most probable fault is the fault in the rectifier diodes. In this thesis, a new arrangement of diodes is introduced to increases the reliability of the rectifier and power supply. A theoretical analysis is presented to compare power supply performance in the presence of the conventional crowbar device with the IGBT based crowbar. Experimental results are presented to demonstrate practical considerations of the proposed crowbar structure and its appropriate performance. This paper shows that high voltage power supply has more fault-resiliency and less restoration time with IGBT based crowbar and proposed arrangement of diodes
  9. Keywords:
  10. Monte Carlo Simulation ; Protection ; Crowbar ; Resiliency Matrix ; Semiconductor Switch ; High Voltage Power Supply

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