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Impulse testing of power transformers – a model reference approach

Impulse testing of power transformers – a model reference approach

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An objective classification of faults that can occur during impulse tests on power transformers is proposed. It includes nonlinear elements, breakdown, and partial discharge events. An analysis of a layer winding in the time and frequency domains with these faults shows that current assessment methods must be used with caution. A model reference approach is proposed to distinctly improve recognition in such cases. The method is immune to changes of wave shape and the instant of fault is available by observation.

Inspec keywords: transient response; failure analysis; time-frequency analysis; power transformer testing; fault diagnosis; discharges (electric)

Other keywords: nonlinear elements; fault recognition; layer winding analysis; time/frequency domain analysis; breakdown; fault classification; model reference analysis; partial discharge events; power transformer impulse testing; failure analysis

Subjects: General circuit analysis and synthesis methods; Transformers and reactors; Gas discharges; Reliability

References

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      • E. Kuffel , W.S. Zaengl . (1986) High Voltage Engineering.
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      • P. Glaninger . Modal Analysis as a means of explaining the oscillatory behaviour of Transformer windings. Brown-Boveri Rev. , 1 , 41 - 49
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    4. 4)
      • C.K. Roy , J.R. Biswas . Studies on impulse behaviour of a transformer winding with simulated faults by analogue modelling. IEE Proc. C, Gener. Transm. Distrib. , 401 - 412
    5. 5)
      • R.C. Degeneff . A general method for determining resonance in transformer windings. IEEE Trans. Power Appar. Syst. , 2 , 649 - 655
    6. 6)
      • Malewski, R., Gokenbach, E., Maeier, R., Fellmann, K.H., Claudi, A.: `Five years of monitoring the impulse test of power transformers with digital recorders and the transfer function method', 12-201, presented at CIGRE, 1992, p. 1–6.
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