University of SaskatchewanHARVEST
  • Login
  • Submit Your Work
  • About
    • About HARVEST
    • Guidelines
    • Browse
      • All of HARVEST
      • Communities & Collections
      • By Issue Date
      • Authors
      • Titles
      • Subjects
      • This Collection
      • By Issue Date
      • Authors
      • Titles
      • Subjects
    • My Account
      • Login
      JavaScript is disabled for your browser. Some features of this site may not work without it.
      View Item 
      • HARVEST
      • Electronic Theses and Dissertations
      • Graduate Theses and Dissertations
      • View Item
      • HARVEST
      • Electronic Theses and Dissertations
      • Graduate Theses and Dissertations
      • View Item

      A DIGITAL TRANSFORMER DIFFERENTIAL AND RESTRICTED EARTH FAULT RELAY

      Thumbnail
      View/Open
      Shah_Dennis_V_1981_sec.pdf (6.055Mb)
      Date
      1981-08
      Author
      Shah, Dennis Vidyavilas
      Type
      Thesis
      Degree Level
      Masters
      Metadata
      Show full item record
      Abstract
      Many kinds of relays are used to detect faults in power transformers. Two of these relays are the restricted earth fault and transformer differential relays. The concepts of harmonic restraint and variable percentage of differential characteristic have been widely used in the conventional transformer differential relays. In the past ten years several methods have been proposed for designing digital transformer differential relays. This project investigates the feasibility of designing a digital differential and restricted earth fault relay. The differential protection segment includes the harmonic restraint and variable percentage differential characteristic features. Non-recursive digital filters are used to determine the fundamental and harmonic frequency components of the transformer currents. The filters have been designed using the least error squares approach, the Fourier series method and the frequency sampling method. The frequency responses of the designed filters have also been investigated. A digital logic implementing the restricted earth fault and transformer differential relay has been developed. The relay has been tested using simulated internal faults and magnetizing inrush conditions. Some test results are also included.
      Degree
      Master of Science (M.Sc.)
      Department
      Electrical and Computer Engineering
      Program
      Electrical Engineering
      Supervisor
      Sachdev, M. S.
      Copyright Date
      August 1981
      URI
      http://hdl.handle.net/10388/8055
      Collections
      • Graduate Theses and Dissertations
      University of Saskatchewan

      University Library

      © University of Saskatchewan
      Contact Us | Disclaimer | Privacy