Detection of power transformer bushing faults and oil degradation using frequency response analysis

Hashemnia, Naser; Abu-Siada, A.; Islam, Syed

doi:10.1109/tdei.2015.005032

Cited by 76 publications

(44 citation statements)

References 27 publications

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“…Even though the bushing capacitance is dominant, the other one was also evaluated using Maxwell. The analysis of bushing influence of FR curve can be found in the literature [26], where changes are visible in the high frequency range. Authors' experiments show that the FR of a transformer changes in the LF range (up to 10 kHz) after connecting additional capacitance to the bushing in the other phase rather than the tested one, and in this way modifying the total capacitance of the object [9], which will be presented in Section 4.…”

Section: Modeling Resultsmentioning

confidence: 99%

The Influence of Capacitance and Inductance Changes on Frequency Response of Transformer Windings

et al. 2019

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Frequency Response Analysis (FRA) is a test method used for assessment of mechanical condition of transformer active parts. Its biggest problem is the interpretation of test results, namely the relationship between scale of differences between compared curves and the decision for further operation of the given transformer. Very often visible differences between two FRA curves do not mean that there is a deformation in the winding. The cause of the curve shift may come from other elements of the transformer that influence inductive or capacitive parameters. This paper takes under consideration the influence of both capacitance and inductance changes on transformer frequency response (FR). The analysis is performed with the computer model of a transformer and also some experimental results are presented, showing the influence of capacitance and inductance changes on the FR of real transformers. The results of research showed that this influence may lead to misleading effects on the shape of FR characteristics. The paper presents an analysis that can be used in the assessment of FRA measurement, especially in the case of uncertain data comparison results.

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Section: Modeling Resultsmentioning

confidence: 99%

The Influence of Capacitance and Inductance Changes on Frequency Response of Transformer Windings

et al. 2019

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“…[1][2][3][4][5][6][7][8][9][10] In addition, there are few more attempts made to expand the potential of FRA method to assess the condition of bushings and power cables. [10][11][12][13][14][15][16][17][18] This approach is reasonable as the presence of moisture and material degradation in the insulation geometry of transformers and bushings can be identified at very low frequencies (μHz till Hz) and at very high frequencies (few kHz till MHz, in some cases GHz). 3,4,[19][20][21][22][23][24] So, a simple comparison of the measured spectra (magnitude/phase response) with the respective "signature" data would reveal the insulation status of high voltage apparatus appropriately.…”

Section: Introductionmentioning

confidence: 99%

Nonconventional measurements on insulation materials high voltage bushings and power cables using frequency response analysis method

Arumugam

2020

Engineering Reports

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Power utilities desire an alternate noninvasive test method for assessing the diagnostic status of power apparatus. The primary reason is to minimize the economic constraints and ensure lifetime and reliability of power apparatus within shorter duration. In this context, frequency response analysis (FRA) method is increasingly recommended. The underlying principle of fault diagnosis using FRA method focuses on correlating the insulation condition to the changes in the magnitude and phase frequency response function. Existing practices validates the usage of FRA method in ascertaining the insulation integrity of transformers. Further attempts to expand the potential of FRA in method in determining the insulation status of power apparatus other than transformers, lack scientific and experimental evidence. To fill this gap, a research on using FRA method in assessing the insulation condition of high voltage bushings and power cables is initiated. Initially, test samples of insulation materials that are commonly used in bushings and cables are selected. The chosen samples are prepared in such a way that they represent common defect conditions that inflict premature material degradation and failures. These samples are grouped accordingly, placed on test cells, subjected to nonconventional FRA tests and their diagnostic status are respectively ascertained through comparative analysis. Following this, the pertinent findings are validated on actual bushings and power cables installed on a power transformer. In summary, the findings of this studies not only validate the usage of FRA method but provides the missing scientific and technical evidences and indices that could be used for diagnosing power apparatus. K E Y W O R D S bushings, cables, frequency response analysis, nonconventional, transformersThis is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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“…Carbon monoxide (CO) and carbon dioxide (CO 2 ) can be produced due to cellulose degradation, atmospheric leak or as a result of long term oxidation of transformer oil [7]. The amount of produced gases and the rate of generation reflect the general health condition of the transformer and can be used to identify various transformer internal faults and can be employed along with other transformer condition monitoring parameters to estimate the remnant operational life of the transformer [8][9][10][11]. Partial discharge activity produces H 2 and CH 4 while arcing generates all gases including traceable amount of C 2 H 2 [12].…”

Section: Introductionmentioning

confidence: 99%

Improved Consistent Interpretation Approach of Fault Type within Power Transformers Using Dissolved Gas Analysis and Gene Expression Programming

Abu-Siada

2019

Energies

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Dissolved gas analysis (DGA) of transformer oil is considered to be the utmost reliable condition monitoring technique currently used to detect incipient faults within power transformers. While the measurement accuracy has become relatively high since the development of various off-line and on-line measuring sensors, interpretation techniques of DGA results still depend on the level of personnel expertise more than analytical formulation. Therefore, various interpretation techniques may lead to different conclusions for the same oil sample. Moreover, ratio-based interpretation techniques may fail in interpreting DGA data in case of multiple fault conditions and when the oil sample comprises insignificant amount of the gases used in the specified ratios. This paper introduces an improved approach to overcome the limitations of conventional DGA interpretation techniques, automate and standardize the DGA interpretation process. The approach is built based on incorporating all conventional DGA interpretation techniques in one expert system to identify the fault type in a more consistent and reliable way. Gene Expression Programming is employed to establish this expert system. Results show that the proposed approach provides more reliable results than using individual conventional methods that are currently adopted by industry practice worldwide.

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Detection of power transformer bushing faults and oil degradation using frequency response analysis

Cited by 76 publications

References 27 publications

The Influence of Capacitance and Inductance Changes on Frequency Response of Transformer Windings

The Influence of Capacitance and Inductance Changes on Frequency Response of Transformer Windings

Nonconventional measurements on insulation materials high voltage bushings and power cables using frequency response analysis method

Improved Consistent Interpretation Approach of Fault Type within Power Transformers Using Dissolved Gas Analysis and Gene Expression Programming

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