Evaluation of FRA and VM Measurements Complementarity in the Field Conditions

Banaszak, S.; Kornatowski, E.

doi:10.1109/tpwrd.2015.2497370

Cited by 15 publications

(6 citation statements)

References 10 publications

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“…The FRA and VM methods can be utilized for joint analysis as their results are complementary, as described by the authors in [9]. The VM method is based on analyzing the vibrations generated by the core and windings separately, which can be recorded both in a transient state (caused by the inrush current in windings) and steady state (caused by the magnetostriction phenomenon in the core).…”

Section: The Analysis Of Fra and Vm Measurement Resultsmentioning

confidence: 99%

Quality Index for Assessment of the Mechanical Condition of Transformers’ Active Part with Frequency Response and Vibroacoustic Measurements

Kornatowski,

Banaszak,

Molenda

2024

Energies

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The paper describes the application of the numerical tool quality index for an objective evaluation of complementary frequency response analysis (FRA) and vibroacoustic method (VM) test methods. These diagnostic methods are used in the industrial practice of transformer diagnostics for the assessment of the mechanical condition of windings and a core. The quality index is based on a numerical comparison of the curve obtained from measurements and the reference curve in a frequency domain. The quality index is based on estimators for the covariance, variance, and expected values. First, both methods of analysis were applied to a group of transformers of similar construction, leading conclusions on quality index values being quickly drawn. Next, it was applied to another transformer’s FRA and VM measurement results. The results showed problems with its mechanical condition, thus confirming that the proposed methods can be used in the practical assessment of transformers with these two diagnostic methods. The assessment of transformer’s active-part mechanical condition with complementary FRA and VM methods can be performed much more easily with the proposed quality indices.

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Section: The Analysis Of Fra and Vm Measurement Resultsmentioning

confidence: 99%

Quality Index for Assessment of the Mechanical Condition of Transformers’ Active Part with Frequency Response and Vibroacoustic Measurements

Kornatowski,

Banaszak,

Molenda

2024

Energies

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“…The proposed definition of the quality index, based on the statistical properties of compared datasets, may be successfully adapted for other methods of analysis of similarities or differences between curves, such as vibroacoustic diagnostics of transformers (VM) [28], or even into other fields in science and industry.…”

Section: Discussion Of Frqi Resultsmentioning

confidence: 99%

Frequency Response Quality Index for Assessing the Mechanical Condition of Transformer Windings

Kornatowski

Banaszak

2019

Energies

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Frequency response analysis (FRA) is a popular method for assessing a transformer’s mechanical condition. The paper proposes a new method for interpreting the frequency response measurement results. The currently used numerical indices only give one value, which may be misleading in the analysis, while the proposed frequency response quality index (FRQI) tool analyses three separate features in the whole frequency range. The applied numerical calculations technique allows for estimations of not only the values of the average quality indices, but also locally for given frequency ranges of the analysed spectrum. It allows for determination of the problems that can be found in the active part of a transformer. The presented results come from three transformers, representing cases of typical faults. Two of them are from industry, while one was used for deformational tests in laboratory conditions. The proposed FRQI method showed its usefulness in FRA test results analysis and may be introduced into the automated assessment of such data. Each of the component parameters is sensitive to other types of differences observed between the compared frequency response curves, and may be used as a good quality detection tool.

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“…However, for a comprehensive assessment of the technical condition, it is necessary to determine possible deformations and loosening of the windings. This is additionally possible using combined SFRA and VM on-site tests [16], which are only included in the more advanced TrafoGrade system. The developed algorithm for determining the health index contains numerical values mainly in the range of 0 to 10 points.…”

Section: Health Index IImentioning

confidence: 99%

Condition Assessment of Power Transformers Based on Health Index Value

Bohatyrewicz

Płowucha²,

Subocz

2019

Applied Sciences

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In electric power systems, health index algorithms are mostly used for evaluation of the transformer population. In this method, some assessment criteria are insensitive when it comes to judging the technical state of the edges of the age spectrum. This paper presents a new health index calculation method that aims to improve the overall effectiveness of the assessment. The proposed algorithm is based on regularly conducted oil diagnostics and easily available maintenance data to enable estimation and updating of the device’s health status in short intervals from an operational point of view. This method is compared to another health index algorithm built from the same parameters, but with different weights and an alternative result assessment philosophy. The two health index calculation methods are tested on a population of 96 power transformers and then compared to results obtained with an expert system, which is based on much more advanced diagnostic tests to determine the technical condition of the unit. The results of the experiment show that proper selection of weighting factors of the transformer’s technical condition parameters during health index calculation may help in simplifying its assessment while maintaining satisfactory accuracy in comparison to a highly advanced expert method.

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Evaluation of FRA and VM Measurements Complementarity in the Field Conditions

Cited by 15 publications

References 10 publications

Quality Index for Assessment of the Mechanical Condition of Transformers’ Active Part with Frequency Response and Vibroacoustic Measurements

Quality Index for Assessment of the Mechanical Condition of Transformers’ Active Part with Frequency Response and Vibroacoustic Measurements

Frequency Response Quality Index for Assessing the Mechanical Condition of Transformer Windings

Condition Assessment of Power Transformers Based on Health Index Value

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