Transformer winding temperature estimation based on tank surface temperature

Wenyu Guo; Jaury Wijaya; Daniel Martin; Nick Lelekakis

doi:10.1117/12.880615

14 April 2011 Transformer winding temperature estimation based on tank surface temperature

Wenyu Guo, Jaury Wijaya, Daniel Martin, Nick Lelekakis

Proceedings Volume 7981, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011; 79812Y (2011) https://doi.org/10.1117/12.880615
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2011, San Diego, California, United States

Abstract

Power transformers are among the most valuable assets of the electrical grid. Since the largest units cost in the order of millions of dollars, it is desirable to operate them in such a manner that extends their remaining lives. Operating these units at high temperature will cause excessive insulation ageing in the windings. Consequently, it is necessary to study the thermal performance of these expensive items. Measuring or estimating the winding temperature of power transformers is beneficial to a utility because this provides them with the data necessary to make informed decisions on how best to use their assets. Fiber optic sensors have recently become viable for the direct measurement of winding temperatures while a transformer is energized. However, it is only practical to install a fiber optic temperature sensor during the manufacture of a transformer. For transformers operating without fiber optic sensors, the winding temperature can be estimated with calculations using the temperature of the oil at the top of the transformer tank. When the oil temperature measurement is not easily available, the temperature of the tank surface may be used as an alternative. This paper shows how surface temperature may be utilized to estimate the winding temperature within a transformer designed for research purposes.

Citation Download Citation

Wenyu Guo, Jaury Wijaya, Daniel Martin, and Nick Lelekakis "Transformer winding temperature estimation based on tank surface temperature", Proc. SPIE 7981, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011, 79812Y (14 April 2011); https://doi.org/10.1117/12.880615

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