Winding Temperature Measurement in a 154 kV Transformer Filled with Natural Ester Fluid

Title & Authors
Winding Temperature Measurement in a 154 kV Transformer Filled with Natural Ester Fluid
Kweon, Dongjin; Koo, Kyosun;

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 $\small{108.4^{\circ}C}$, calculated by the conventional heat run test. However, the hot spot temperature measured using the optical fiber sensor was $\small{129.4^{\circ}C}$ 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 $\small{21.0^{\circ}C}$ higher than that calculated by the conventional heat run test.
Keywords
Power transformer;Hot spot temperature;Temperature measurement;Optical fiber;Heat run test;
Language
English
Cited by
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Journal of Electrical Engineering and Technology, 2015. vol.10. 1, pp.176-187
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A review of critical evaluation of natural ester vis-a-vis mineral oil insulating liquid for use in transformers: Part II, IEEE Transactions on Dielectrics and Electrical Insulation, 2016, 23, 3, 1705
2.
Multi-field Coupling Simulation and Experimental Study on Transformer Vibration Caused by DC Bias, Journal of Electrical Engineering and Technology, 2015, 10, 1, 176
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