Method and apparatus for leakage monitoring for oil-immersed electrical transformers

Feng, Xianyong; Mousavi, Mirrasoul

Method and apparatus for leakage monitoring for oil-immersed electrical transformers

Patent · Mon Jan 28 23:00:00 EST 2019

OSTI ID:1499125

Feng, Xianyong; Mousavi, Mirrasoul

The present invention comprises an apparatus and method for detecting a loss of oil from an oil-immersed transformer, based on fitting a transformer top-oil temperature model to online measurements in an iterative optimization process that yields fitted values for a first model parameter representing the top-oil temperature rise over ambient temperature and a second model parameter representing the oil time constant. Among the several advantages seen in the contemplated apparatus and method is the reduction in required instrumentation, whereby transformer oil leaks are indirectly detected without requiring pressure sensors or mechanical floats, although the presence of such sensors is not excluded by the teachings herein.

Research Organization:: ABB Inc., Cary, NC (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: OE0000547

Assignee:: ABB Inc. (Cary, NC)

Patent Number(s):: 10,192,677

Application Number:: 14/457,768

OSTI ID:: 1499125

Country of Publication:: United States

Language:: English

References (6)

A new method for the calculation of the hot-spot temperature in power transformers with onan cooling Radakovic, Z.; Feser, K. IEEE Transactions on Power Delivery, Vol. 18, Issue 4 https://doi.org/10.1109/TPWRD.2003.817740	journal	October 2003
Temperature responses to step changes in the load current of power transformers Nordman, H.; Rafsback, N.; Susa, D. IEEE Transactions on Power Delivery, Vol. 18, Issue 4 https://doi.org/10.1109/TPWRD.2003.817516	journal	October 2003
Dynamic Thermal Modelling of Power Transformers Susa, D.; Lehtonen, M.; Nordman, H. IEEE Transactions on Power Delivery, Vol. 20, Issue 1 https://doi.org/10.1109/TPWRD.2004.835255	journal	January 2005
A fundamental approach to transformer thermal modeling. I. Theory and equivalent circuit Swift, G.; Molinski, T. S.; Lehn, W. IEEE Transactions on Power Delivery, Vol. 16, Issue 2 https://doi.org/10.1109/61.915478	journal	April 2001
Predicting transformer temperature rise and loss of life in the presence of harmonic load currents Gouda, O. E.; Amer, G. M.; Salem, W. A. A. Ain Shams Engineering Journal, Vol. 3, Issue 2 https://doi.org/10.1016/j.asej.2012.01.003	journal	June 2012
A fundamental approach to transformer thermal modeling. II. Field verification Swift, G.; Molinski, T. S.; Bray, R. IEEE Transactions on Power Delivery, Vol. 16, Issue 2 https://doi.org/10.1109/61.915479	journal	April 2001

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