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Computer-aided analysis of high-speed protective relays

Computer-aided analysis of high-speed protective relays

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© The Institution of Electrical Engineers
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Most of the modern distance relays are designed to avoid overreaching due to the transient d.c. component of the fault current, whereas a more likely source of transients in e.h.v. systems is the oscillatory discharge of the system charging current into the fault. Until now attempts have not been made to reproduce these transients in the laboratory. This paper describes an analogue and an accurate digital simulation of these harmonic transients. The dynamic behaviour of a typical polarised mho-type relay is analysed, and results are presented. The paper also advocates the use of active filters for filtering the harmonics associated with e.h.v. system, and hence, to improve the speed of response and accuracy of the protective relays.

Inspec keywords: computer aided analysis; relay protection; electrical engineering applications of computers; simulation; relays; transients

Other keywords: harmonics; electrical engineering applications of computers; high speed protective relays; digital simulation; oscillatory discharge; analogue simulation; dynamic behaviour of mho type relay; distance relays; active filters; transients; computer aided analysis; EHV; line charging effects

Subjects: Power system protection; Power engineering computing

References

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      • A.R. Warrington , C. Van . (1971) , Protective relays: their theory and practice.
    2. 2)
      • L. Perez-Cavero , A. Wright . Simulation of power-system fault currents and voltages for protective-equipment testing. Proc. IEE , 11 , 1604 - 1610
    3. 3)
      • G.K. Laycock , P.G. McLaren . Filtering applications in static distance relays. Proc. IEE , 3 , 313 - 317
    4. 4)
      • J.M. Cooley , J.W. Tukey . (1965) An algorithm for the machine calculation of complex Fourier series, Math. Comput..
    5. 5)
      • F.L. Hamilton , N.S. Ellis . Developments in bench testing facilities for protective gear. Reyrolle Rev. , 21 - 29
    6. 6)
      • Kothari, G.C., Parthasarthy, K., Ashok Kumar, B.S., Khincha, H.P.: `Digital transient analysis of power system and transducers for relay analysis', Paper C73, presented at the IEEE Summer meeting, and e.h.v./u.h.v. conference, 15–20 July 1973, Vancouver, Canada.
    7. 7)
      • E.J. Foster . Active-lowpass filter design. IEEE Trans. , 104 - 111
    8. 8)
      • Krishnan, V.: `Introduction to fast Fourier transforms', Presented at the annual conference of the Computer Society of India, 1972, Bombay.
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