A mathematical contribution to the analysis of moisture migration in power transformer oil-paper insulation systems

Marques, André P.; Sousa, Felipe Resende de Carvalho; Brito, Leonardo da Cunha; Ribeiro, Cacilda J.; Azevedo, Cláudio Henrique Bezerra; Santos, Jose

doi:10.1109/demped.2015.7303661

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…4. Note that the calculated values, using the one-dimensional approach described by Marques et al (2015), fall within the error range presented by the monitoring device, indicating the accuracy of the method.…”

Section: Typical Loadingsupporting

confidence: 56%

“…2, an algorithm was developed for the study off the effects of moisture and temperature in the paper-oil insulation system, by means of load variation. It consists of the use of a one-dimensional model of moisture dynamics (Marques et al 2015), which uses the finite difference method, combined with Eqs. (1)-(13), and that enable the pointwise evaluation of the aforementioned parameters.…”

Section: Methods To Classify the Combined Effects Of Moisture By Meansmentioning

confidence: 99%

“…• The first phase consists in simulating the migration of moisture in the transformer's oil-paper insulation system, using a one-dimensional model based on finite differences, presented in Marques et al (2015). • The second phase consists in examining the harmful effects of moisture and partial ratings of the transformer, considering these effects.…”

Section: Methods To Classify the Combined Effects Of Moisture By Meansmentioning

confidence: 99%

“…The second case study considers the above-mentioned transformer supplying power to a group of consumers on a typical day, with a maximum load of 90% of its rated power. This was a real case, observed in the field, in which a moisture monitoring system was installed on a transformer of a local utility (Marques et al 2015), as shown in Fig. 3.…”

Section: Typical Loadingmentioning

confidence: 99%

See 3 more Smart Citations

Method for Rating and Analyzing the Combined Effects of Moisture and Temperature on the Oil–Paper Insulation System of Power Transformers by Means of Load Variations

Sousa

Ribeiro

Marques

et al. 2020

J Control Autom Electr Syst

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This paper presents an innovative method devised to study some of the harmful effects of moisture on power transformers, considering the possible formation of bubbles and free water. Its novelty stems from the fact that it comprises: (a) a rating system from "A" to "E" and their respective recommended actions and (b) an analysis that involves varying the different levels of electrical loads applied to the equipment. The importance of this work is confirmed when power transformers are exposed to unfavorable conditions that can critically affect their insulation. To this end, a tool to study moisture was developed, which uses the finite difference method, based not only on the experience of experts/analysts but also on existing studies in the area and on the analysis of a database of actual field tests. The contribution of this work is an efficient method, implemented via a computational algorithm, which provides a technique for the real-time or offline rating of power transformers, helping maintenance teams to diagnose problems and decide whether or not to repair the equipment. The tool provided the satisfactory results, which are presented in a case study of a real transformer operating at the local electric utility company. These results were obtained by applying different levels of electrical loads, for which thermal simulations were performed.

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Section: Typical Loadingsupporting

confidence: 56%

Section: Methods To Classify the Combined Effects Of Moisture By Meansmentioning

confidence: 99%

Section: Methods To Classify the Combined Effects Of Moisture By Meansmentioning

confidence: 99%

Section: Typical Loadingmentioning

confidence: 99%

See 2 more Smart Citations

Method for Rating and Analyzing the Combined Effects of Moisture and Temperature on the Oil–Paper Insulation System of Power Transformers by Means of Load Variations

Sousa

Ribeiro

Marques

et al. 2020

J Control Autom Electr Syst

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show abstract

A General Methodology for Evaluation and Classification of Oil-Immersed Power Transformers: Application to Electrical and Physicochemical Parameters

Brito

Marques²,

Ribeiro

et al. 2019

J Control Autom Electr Syst

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Simulation Analysis of Moisture Dynamics in Oil/Pressboard System under Variable Temperature

Jiang

et al. 2020

2020 IEEE 3rd International Conference on Dielectrics (ICD)

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A mathematical contribution to the analysis of moisture migration in power transformer oil-paper insulation systems

Cited by 5 publications

References 6 publications

Method for Rating and Analyzing the Combined Effects of Moisture and Temperature on the Oil–Paper Insulation System of Power Transformers by Means of Load Variations

Method for Rating and Analyzing the Combined Effects of Moisture and Temperature on the Oil–Paper Insulation System of Power Transformers by Means of Load Variations

A General Methodology for Evaluation and Classification of Oil-Immersed Power Transformers: Application to Electrical and Physicochemical Parameters

Simulation Analysis of Moisture Dynamics in Oil/Pressboard System under Variable Temperature

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