University of SaskatchewanHARVEST
  • Login
  • Submit Your Research
  • 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
      • College of Graduate and Postdoctoral Studies
      • Electronic Theses and Dissertations
      • View Item
      • HARVEST
      • College of Graduate and Postdoctoral Studies
      • Electronic Theses and Dissertations
      • View Item

      A MICROPROCESSOR-BASED SYSTEM FOR PROTECTION OF POWER TRANSFORMERS

      Thumbnail
      View/Open
      Sidhu_Tarlochan_Singh_1989_sec.pdf (6.777Mb)
      Date
      1989-09
      Author
      Sidhu, Tarlochan Singh
      Type
      Thesis
      Degree Level
      Doctoral
      Metadata
      Show full item record
      Abstract
      Differential, overcurrent and ground fault relays are used for protecting transformers in electric. power systems. Several algorithms, that perform these functions and are suitable for implementation on microprocessors, have been proposed in the past. This thesis describes and evaluates an improved technique for modelling inverse-time overcurrent relay characteristics. This technique, which is used in a digital overcurrent relaying algorithm, is simple and requires a modest amount of computer memory. The proposed algorithm performs most computations in an off-line mode and, therefore, requires few on-line computations. The performance of the algorithm is evaluated using computer simulations. Some test results are reported in the thesis. Digital algorithms that can detect winding faults in power transformers are described in the thesis. The algorithms use non-linear models of a transformer to determine its health. The algorithms take the non-linearity and hysteresis of the transformer core into account, however, these do not explicitly become part of the algorithms. They are suitable for protecting transformers whose winding currents can not be measured at the terminals. The performance of the algorithms is studied for a variety of operating conditions simulated on a digital computer using the Electro-Magnetic Transient Program (EMTP). Some results of the simulation studies are reported in the thesis. The proposed algorithms for overcurrent relaying and transformer winding protection are implemented in a microprocessor-based system. The design implementation and, testing of the system are presented in the thesis. The system includes a man-machine interface for changing relay settings and relay software, and for uploading the relay signals for further analysis. The performance of the system was checked in the laboratory. The testing procedure and some test results are also presented.
      Degree
      Doctor of Philosophy (Ph.D.)
      Department
      Electrical and Computer Engineering
      Program
      Electrical Engineering
      Copyright Date
      September 1989
      URI
      http://hdl.handle.net/10388/8369
      Collections
      • Electronic Theses and Dissertations
      University of Saskatchewan

      University Library

      © University of Saskatchewan
      Contact Us | Disclaimer | Privacy