Journal of Electrical Engineering and Technology

The Korean Institute of Electrical Engineers (대한전기학회)
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Winding Temperature Measurement in a 154 kV Transformer Filled with Natural Ester Fluid

  • Kweon, Dongjin (Transmission & Distribution Laboratory, Korea Electric Power Research Institute) ;
  • Koo, Kyosun (Transmission & Distribution Laboratory, Korea Electric Power Research Institute)
  • Received : 2012.03.13
  • Accepted : 2012.06.25
  • Published : 2013.01.02
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Abstract

This paper measures the hot spot temperatures in a single-phase, 154 kV, 15/20 MVA power transformer filled with natural ester fluid using optical fiber sensors and compares them with those calculated by conventional heat run tests. A total of 14 optical fiber sensors were installed on the high-voltage and low-voltage windings to measure the hot spot temperatures. In addition, three thermocouples were installed in the transformer to measure the temperature distribution during the heat run tests. In the low-voltage winding, the hot spot temperature was $108.4^{\circ}C$, calculated by the conventional heat run test. However, the hot spot temperature measured using the optical fiber sensor was $129.4^{\circ}C$ between turns 2 and 3 on the upper side of the low-voltage winding. Therefore, the hot spot temperature of the low-voltage winding measured using the optical fiber sensor was $21.0^{\circ}C$ higher than that calculated by the conventional heat run test.

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References

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  1. Multi-field Coupling Simulation and Experimental Study on Transformer Vibration Caused by DC Bias vol.10, pp.1, 2015, https://doi.org/10.5370/JEET.2015.10.1.176
  2. A review of critical evaluation of natural ester vis-a-vis mineral oil insulating liquid for use in transformers: Part II vol.23, pp.3, 2016, https://doi.org/10.1109/TDEI.2016.005371