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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:
;
Issue Date:
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):
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01F - MAGNETS
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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.
Feng, Xianyong, & Mousavi, Mirrasoul. Method and apparatus for leakage monitoring for oil-immersed electrical transformers. United States.
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.
@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:

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


Dynamic Thermal Modelling of Power Transformers
journal, January 2005


A fundamental approach to transformer thermal modeling. I. Theory and equivalent circuit
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Predicting transformer temperature rise and loss of life in the presence of harmonic load currents
journal, June 2012


A fundamental approach to transformer thermal modeling. II. Field verification
journal, April 2001


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