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Some important aspects of oil power transformer thermal protection

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Abstract

The original transient thermal model of transformers with ONAN cooling was developed in a previous work by the authors. The parameters of the model are determined from inexpensive measurements in the short-circuit heating experiment. Two problems exist in the on-line application of the model: unknown starting hot-spot temperature and variation in the thermal parameters in a long-term transformer operation. Both are discussed in this paper, and the solution through the application of a thermal observer is also discussed.

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Acknowledgement

The research was supported by the Alexander von Humboldt Foundation.

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Authors and Affiliations

  1. Institute for Power Transmission and High-voltage Technology, University of Stuttgart, Pfaffenwaldring 47, 70569, Stuttgart, Germany

    Z. Radakovic & K. Feser

Authors
  1. Z. Radakovic
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  2. K. Feser
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Correspondence to Z. Radakovic.

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Radakovic, Z., Feser, K. Some important aspects of oil power transformer thermal protection. Electr Eng 86, 1–8 (2003). https://doi.org/10.1007/s00202-003-0178-2

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  • DOI: https://doi.org/10.1007/s00202-003-0178-2

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