The Main Characteristics of Protective Relays

Phase and Amplitude Comparators—Relay Characteristics—General Equation for Characteristics—Inversion Chart—Resonance—Appendix
  • A. R. van C. Warrington


In this chapter a general mathematical relationship for relays will be developed which is applicable to all types of relay movement. A graphical method of showing the complete performance of any relay at pick-up will be discussed.


Impedance Diagram Phase Comparator Protective Relay Threshold Characteristic Protected Circuit 


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  1. 6.
    Suits, C. G. ‘Non-linear Circuits for Relay Applications’, Electrical Engineering, 50, December, 1931, pp. 763–765.Google Scholar
  2. 7.
    Suits, C. G. ‘Non-linear Circuits Applied to Relays’, Electrical Engineering, 52, April, 1933, pp. 244–246.Google Scholar

Copyright information

© Albert Russell van Cortlandt Warrington 1968

Authors and Affiliations

  • A. R. van C. Warrington
    • 1
  1. 1.The English Electric Company LimitedStaffordUK

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