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

Feng, Xianyong; Mousavi, Mirrasoul

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

Abstract

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.

Inventors:: Feng, Xianyong; Mousavi, Mirrasoul

Issue Date:: 2019-01-29

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

Sponsoring Org.:: USDOE

OSTI Identifier:: 1499125

Patent Number(s):: 10192677

Application Number:: 14/457,768

Assignee:: ABB Inc. (Cary, NC)

Patent Classifications (CPCs):: G - PHYSICS G01 - MEASURING G01M - TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES

G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES

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G - PHYSICS G01 - MEASURING G01M - TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES
G01M3/002 - {by using thermal means}

G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G01N25/18 - by investigating thermal conductivity
G01N25/72 - Investigating presence of flaws

H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01F - MAGNETS
H01F2027/406 - {Temperature sensor or protection}
H01F27/402 - {Association of measuring or protective means}

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DOE Contract Number:: OE0000547

Resource Type:: Patent

Resource Relation:: Patent File Date: 2014 Aug 12

Country of Publication:: United States

Language:: English

Citation Formats


                    Feng, Xianyong, and Mousavi, Mirrasoul. Method and apparatus for leakage monitoring for oil-immersed electrical transformers.  United States: N. p., 2019. 
        Web.

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                    Feng, Xianyong, & Mousavi, Mirrasoul. Method and apparatus for leakage monitoring for oil-immersed electrical transformers.  United States.

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                    Feng, Xianyong, and Mousavi, Mirrasoul. Tue .  
        "Method and apparatus for leakage monitoring for oil-immersed electrical transformers".  United States.  https://www.osti.gov/servlets/purl/1499125.

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@article{osti_1499125,

  title        = {Method and apparatus for leakage monitoring for oil-immersed electrical transformers},

  author       = {Feng, Xianyong and Mousavi, Mirrasoul},

  abstractNote = {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.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {2019},

  month        = {1}

}

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Works referenced in this record:

System for monitoring and modeling operation of a transformer
patent, August 2016

Tostrud, Mark D.; Stewart, Peter Graham; Ziegler, Ryan
US Patent Document 9,419,430
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/9419430

A new method for the calculation of the hot-spot temperature in power transformers with onan cooling
journal, October 2003

Radakovic, Z.; Feser, K.
IEEE Transactions on Power Delivery, Vol. 18, Issue 4
https://doi.org/10.1109/TPWRD.2003.817740

Cooling system for power transformer
patent, September 2012

Hoffman, Gary R.; Anderson, Jeffrey G.
US Patent Document 8,260,472
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/8260472

Dynamic Thermal Modelling of Power Transformers
journal, January 2005

Susa, D.; Lehtonen, M.; Nordman, H.
IEEE Transactions on Power Delivery, Vol. 20, Issue 1
https://doi.org/10.1109/TPWRD.2004.835255

A fundamental approach to transformer thermal modeling. I. Theory and equivalent circuit
journal, April 2001

Swift, G.; Molinski, T. S.; Lehn, W.
IEEE Transactions on Power Delivery, Vol. 16, Issue 2
https://doi.org/10.1109/61.915478

Predicting transformer temperature rise and loss of life in the presence of harmonic load currents
journal, June 2012

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

Textured-surface quartz resonator fluid density and viscosity monitor
patent, August 1998

Martin, Stephen J.; Wiczer, James J.; Cernosek, Richard W.
US Patent Document 5,798,452
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A fundamental approach to transformer thermal modeling. II. Field verification
journal, April 2001

Swift, G.; Molinski, T. S.; Bray, R.
IEEE Transactions on Power Delivery, Vol. 16, Issue 2
https://doi.org/10.1109/61.915479

Temperature responses to step changes in the load current of power transformers
journal, October 2003

Nordman, H.; Rafsback, N.; Susa, D.
IEEE Transactions on Power Delivery, Vol. 18, Issue 4
https://doi.org/10.1109/TPWRD.2003.817516

Condition diagnosing
patent, November 2005

Stenestam, Bengt-Olof
US Patent Document 6,962,435
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/6962435

Tap changer condition diagnosing
patent, August 2006

Stenestam, Bengt-Olof; Andersson, Gunnar
US Patent Document 7,089,145
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/7089145

Control system for a transformer or reactor
patent, October 2008

Stenestam, Bengt-Olof; Andersson, Gunnar
US Patent Document 7,444,266
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/7444266

Tap changer monitoring
patent, December 2006

Stenestam, Bengt-Olof; Andersson, Gunnar
US Patent Document 7,145,760
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/7145760

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Similar Records

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

Abstract

Citation Formats

System for monitoring and modeling operation of a transformer patent, August 2016

A new method for the calculation of the hot-spot temperature in power transformers with onan cooling journal, October 2003

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Dynamic Thermal Modelling of Power Transformers journal, January 2005

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journal, October 2003

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patent, September 2012

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Predicting transformer temperature rise and loss of life in the presence of harmonic load currents
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