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Studying the Impulse Overloads in the Windings of a Station Service Voltage Transformer

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Abstract

One of the key factors determining the performance of a 110–500-kV station service voltage transformer (SSVT) is a compact insulation design that provides minimum winding sizes. Since SSVTs are new equipment that combine the operational features of a power transformer and the design features of a measuring voltage transformer, it is necessary to study the characteristic transient processes occurring under the impact of lightning-impulse test voltages and lightning and switching overloads in operation in order to ensure proper insulation design. The article presents the results of an experimental investigation of impulse transients in the windings of a full-scale mockup model of an active part of a 20-kV A SSVT with a rated voltage of 110 kV. The influence of grounding the low-voltage winding terminals on the maximum values and duration of impulse stresses on the longitudinal insulation of the high-voltage winding is revealed. It is shown that, unlike in the case of power transformers with disc windings, more significant effects on the insulation are produced when no load is applied on the low-voltage windings.

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References

  1. Larin, V.S., Matveev, D.A., and Nikulov, I.I., The use of power transformers from 110–500 kV overhead lines, Energoekspert, 2017, nos. 5–6.

  2. Lokhanin, A.K., Coordination of isolation of power transformers with reduced insulation level, Elektrichestvo, 2010, no.2.

  3. RD 16 312–86. Transformatory silovye. Elektricheskaya prochnost’ izolyatorov vitkov obmotok (RD 16 312–86. Power Transformers. Electric Strength of Insulation of Coil Windings), Moscow: Minist. Elektrotekh. Prom-sti SSSR, 1986.

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Authors and Affiliations

  1. Moscow Power Engineering Institute, Moscow, 111250, Russia

    A. V. Zhuikov, M. A. Kubatkin, D. A. Matveev & S. I. Khrenov

  2. All-Russian Electrotechnical Institute—branch of FSUE “RFNC-VNIITF”, Moscow, Russia

    V. S. Larin

  3. Ramensky Electrotechnical Plant “Energia”, Ramenskoe, Moscow oblast, 140105, Russia

    I. I. Nikulov

Authors
  1. A. V. Zhuikov
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  2. M. A. Kubatkin
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  3. D. A. Matveev
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  4. S. I. Khrenov
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  5. V. S. Larin
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  6. I. I. Nikulov
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Corresponding author

Correspondence to A. V. Zhuikov.

Additional information

Original Russian Text © A.V. Zhuikov, M.A. Kubatkin, D.A. Matveev, S.I. Khrenov, V.S. Larin, I.I. Nikulov, 2018, published in Elektrotekhnika, 2018, No. 5, pp. 22–26.

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Zhuikov, A.V., Kubatkin, M.A., Matveev, D.A. et al. Studying the Impulse Overloads in the Windings of a Station Service Voltage Transformer. Russ. Electr. Engin. 89, 309–312 (2018). https://doi.org/10.3103/S1068371218050139

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  • DOI: https://doi.org/10.3103/S1068371218050139

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