• DocumentCode
    1377942
  • Title

    Inverse-time underfrequency relay

  • Author

    Hoft, R. G.

  • Author_Institution
    General Electric Company, Schenectady, N. Y.
  • Volume
    75
  • Issue
    6
  • fYear
    1957
  • Firstpage
    625
  • Lastpage
    629
  • Abstract
    THIS PAPER describes a magnetic inverse-time underfrequency relay unit. It contains a relay which is operated when the frequency of an aircraft alternator drops below 380 cps (cycles per second). The time required for the relay to pick up is an inverse function of how far the frequency is below 380 cps. The complete unit contains a frequency-sensitive circuit which provides a voltage signal proportional to alternator frequency for driving a magnetic amplifier which has a very long time constant. The output of the magnetic amplifier is the coil of the underfrequency relay.
  • Keywords
    Magnetic circuits; Magnetic cores; Magnetic flux; Relays; Resistors; Saturation magnetization; Voltage control;
  • fLanguage
    English
  • Journal_Title
    American Institute of Electrical Engineers, Part I: Communication and Electronics, Transactions of the
  • Publisher
    ieee
  • ISSN
    0097-2452
  • Type

    jour

  • DOI
    10.1109/TCE.1957.6372568
  • Filename
    6372568
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1377942