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Performance evaluation of hybrid transfer switches in grounded and ungrounded medium-voltage electrical systems

Yasaman, H ; Sharif University of Technology | 2003

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  1. Type of Document: Article
  2. DOI: 10.1109/QSEPDS.2003.159802
  3. Publisher: Institute of Electrical and Electronics Engineers Inc , 2003
  4. Abstract:
  5. Application of a fast hybrid transfer switch (HTS) as a suitable tool for protection of sensitive electrical loads against power quality problems has attracted much attentions these days. In this paper, methods for desired control of a HTS which consists of a fast fault-detection method and a suitable firing and transfer strategy are proposed. Simulation results of a HTS under various operating conditions for two types of medium-voltage electrical systems, i.e. grounded (star connection) and ungrounded (delta connection) systems, with respect to total transfer time are presented. The results show the capability of the HTS and the proposed control methods in fast transferring of sensitive loads in case of various power quality problems in the system. It is also shown that the transfer process in an ungrounded electrical system is somewhat complicated compared to a grounded electrical system, but it does not necessarily result in longer total transfer time. © 2003 CIGRE
  6. Keywords:
  7. Circuits ; Electrical fault detection ; High temperature superconductors ; Hybrid power systems ; Medium voltage ; Power quality ; Power system protection ; Power system simulation ; Switches ; Thyristors
  8. Source: CIGRE/IEEE PES International Symposium Quality and Security of Electric Power Delivery Systems, CIGRE/PES 2003, 8 October 2003 through 10 October 2003 ; 2003 , Pages 91-96 ; 2858730156 (ISBN); 9782858730155 (ISBN)
  9. URL: https://ieeexplore.ieee.org/document/1259332