Técnicas para el diagnóstico de transformadores de potencia: Una revisión crítica

Henao, Juan David Zorrilla; Fernández, Alexander Céspedes; Gómez, Diego Fernando García

doi:10.4067/s0718-33052020000200184

Cited by 3 publications

(3 citation statements)

References 39 publications

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“…Another of the main events that generates the operating output of a transformer are ground faults, which are generated by failures in the bushings or loss of dielectric strength associated with overloads that initiate electric arcs towards the grounded parts of the transformer. (Zorilla et al, 2020). The following tests have traditionally been used to diagnose the condition of a transformer:…”

Section: Electrical Testsmentioning

confidence: 99%

“…Due to the above, the importance of avoiding such problems has been considered through preventive maintenance programs that carry out reliable diagnostic tests applied to the transformer, which seek to identify the problem before it becomes critical and in this way the problem is identified. can carry out the respective corrective measures (Zorilla et al, 2020). Therefore, to provide guarantees in the provision of preventive maintenance service, in a timely manner, the identification, attention and prevention of potential failures that may be found in the electrical system is required, fundamentally in the power transformers, since these would represent high costs, especially due to the unexpected stoppage of activities and unscheduled corrective processes (Villacrés et al, 2021).…”

Section: Introduction }mentioning

confidence: 99%

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Programming code using the Duval method for diagnosing power transformers and direct way

Rueda Flores,

Pachacama Campaña,

Marrero Ramírez

2023

SIJIS

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A transformer is a piece of equipment of great value in a public or private power substation in that it allows power to be supplied to the production processes. Thus, as it is used, the equipment is exposed to different environmental conditions such as level of contamination, salinity. , height, humidity, among others, as well as energy demand and quality, causing different types of electrical and thermal stress inside. That is why the objective of this study is to implement a programming code using the Duval method for the diagnosis of power transformers. For this, programming based on the supervised learning algorithm is used as a methodology to process the gas concentration levels contained in the dielectric oil obtained from the analysis of dissolved gases and for its interpretation the Duval method is used, which is presented in IEEE C57.104™-2019 standard. The designed code individually processes the dissolved gas analysis reports as well as large quantities of reports from the same transformer or from different ones, allowing the comparison of historical data of the equipment or equipment and the evaluation of its status according to the electrical stress to which it is subjected.

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Section: Electrical Testsmentioning

confidence: 99%

Section: Introduction }mentioning

confidence: 99%

Programming code using the Duval method for diagnosing power transformers and direct way

Rueda Flores,

Pachacama Campaña,

Marrero Ramírez

2023

SIJIS

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“…Un tiempo después, importantes instituciones normativas como la IEEE y la IEC presentaron diversos estándares relacionados al análisis de los gases disueltos; en 1991 se publica el estándar C57.104.1991 "Guía para la interpretación de gases generados en transformadores inmersos en aceite", así mismo, la IEC publica la guía IEC 60599 para la interpretación de los gases disueltos. Estas guías han tenido varias actualizaciones en los últimos veinte años [11].…”

Section: Sensores De Gases Disueltos En Aceiteunclassified

Monitoreo en línea de transformadores de potencia. Una revisión crítica de sensores de temperatura, humedad del aceite y gases disueltos

Salamanca

Cespedes

Aponte

2021

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Los transformadores de potencia son uno de los activos más importantes que conforman las redes eléctricas. Cuando uno de estos activos presenta una falla repentina que involucra la suspensión del suministro de electricidad a los centros de consumo, puede conllevar consecuencias críticas para el sistema de potencia. La mayoría de este tipo de fallas en el transformador, están relacionadas con altos niveles de temperatura, humedad o deterioro de su sistema de aislamiento. Debido a lo anterior, durante las últimas décadas los sistemas de monitoreo en línea para transformadores de potencia han venido adquiriendo una mayor relevancia e integración a las redes y subestaciones eléctricas. En este trabajo se realiza una revisión crítica de tres de los sensores en línea más importantes para la operación y funcionamiento del transformador, como lo son: temperatura, humedad del aceite y gases disueltos. Inicialmente, se realiza una introducción referente a la importancia del transformador de potencia y el concepto de monitoreo en línea. Luego, se presenta una breve descripción con los principales hitos históricos de dichos sensores al igual que algunos de sus aspectos técnicos generales. Además, se proponen algunos criterios de comparación y selección citando ejemplos y casos estadísticos de interés. Finalmente, se presentan las conclusiones y recomendaciones del estudio.

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A New Method for Complex Impedance Measurement of Power Transformers via a Continuous Wavelet Transform

Gómez-Luna,

Candelo-Becerra,

Vasquez

2024

Energies

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The Fourier transform is widely accepted as the time-to-frequency conversion procedure, although it has some limitations. Currently, measurements in the time domain are usually transient (non-periodic waveforms) within a finite window time and discrete (non-continuous) sampled signals. The accuracy of the Fourier transform decreases as the window time and sampling frequency decrease. This is where the wavelet transform proves to be a valuable tool in this analysis. This paper presents a novel method for estimating the complex electrical impedance of power transformers by analyzing transient electrical signals with the continuous wavelet transform. The great importance of knowing the complex electrical impedance of the transformer is that it allows knowing the state and condition of the internal parts, such as the core and the windings, whose behavior depends on the frequency with which the transformer is fed. The wavelet transform is employed in the proposed method to improve the analysis of the frequency response (FRA), following the same procedure commonly used with the Fourier transform. The proposed method is validated by performing an experimental test on a 28 MVA power transformer. The results show that the new method using the continuous wavelet transform is a power tool that enhances the extraction of the total electrical impedance curve (magnitude–phase) compared to the Fourier transform. This enables real-time frequency response analysis in transformers, facilitating accurate diagnosis.

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Técnicas para el diagnóstico de transformadores de potencia: Una revisión crítica

Cited by 3 publications

References 39 publications

Programming code using the Duval method for diagnosing power transformers and direct way

Programming code using the Duval method for diagnosing power transformers and direct way

Monitoreo en línea de transformadores de potencia. Una revisión crítica de sensores de temperatura, humedad del aceite y gases disueltos

A New Method for Complex Impedance Measurement of Power Transformers via a Continuous Wavelet Transform

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