The Correlation of Transformer Oil Electrical Properties with Water Content Using a Regression Approach

Abdi, S.; Harid, Noureddine; Safiddine, Leila; Boubakeur, A.; Haddad, A.

doi:10.3390/en14082089

Cited by 21 publications

(2 citation statements)

References 32 publications

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“…Insulating oil serves in insulation, arc suppression, and cooling in power systems [7][8][9]. The accurate detection of microwater is critical to the safe operation of substation equipment [10][11][12][13][14]. Furthermore, microwave technology is used for subgrade soil moisture detection [15] and steam turbine wet steam measurement [16].…”

Section: Introductionmentioning

confidence: 99%

Modification of the Maxwell–Wagner Heterogeneous Dielectric Model for Heterogeneous Polymers and Emulsions

Qian

Yan

et al. 2022

Polymers

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In heterogeneous polymers and emulsions, the volume fraction of the discrete phase and the frequency of electromagnetic waves affect the accuracy of the dielectric model. The integral method was used to modify the Maxwell–Wagner (M–W) heterogeneous dielectric theory, and a new model for the complex dielectric constant of polymers and emulsions was established. The experimental data were compared with the results of the M–W heterogeneous dielectric integral modification model and other theoretical models for different frequencies and volume fractions of the discrete phase. We discovered that with a decreasing volume fraction of the discrete phase, the dominant frequency range of the integral modification model expanded. When the volume fraction of the discrete phase is 10%, the dominant frequency range reaches 3 GHz. When the volume fraction of the discrete phase is 1%, the dominant frequency range reaches 4 GHz. When the volume fraction of the discrete phase is 0.06%, the dominant frequency range of the real part reaches 9.6 GHz, and the dominant frequency range of the imaginary part reaches 7.2 GHz. These results verify the advantages of the M–W modification model, which provides a theoretical basis to study the dielectric properties of polymers and emulsions, as well as for microwave measurement.

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Section: Introductionmentioning

confidence: 99%

Modification of the Maxwell–Wagner Heterogeneous Dielectric Model for Heterogeneous Polymers and Emulsions

Qian

Yan

et al. 2022

Polymers

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“…In [13,14], oil condition assessment was performed using Markov networks. In [15,16] fuzzy logic was applied, and in [17][18][19] regression models were used. Considering that under real operating conditions the condition of oils is evaluated by comparing the measured values of indicators with maximum permissible values (MPV), which are regulated by international or national standards [20,21], in [22][23][24] a correction of MPV indicators of transformer oils was performed.…”

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confidence: 99%

Analysis of distribution laws of transformer oil indicators in 110-330 kV transformers

Shutenko

Ponomarenko

2021

Electrical Engineering & Electromechanics

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Introduction. Ensuring the operational reliability of power transformers is an urgent task for the power industry in Ukraine and for most foreign countries. One of the ways to solve this problem is the correction of maximum permissible values of insulation parameters. However, such a correction is fundamentally impossible without an analysis of the laws of distribution of diagnostic indicators in the equipment with different states. The purpose of the research is to analyse the laws of distribution of the quality indicators of transformer oil with different states in 110 and 330 kV transformers. Novelty. It was found that both 330 kV autotransformers and 110 kV transformers have the displacements between the mathematical expectations of the distribution density of usable oil indicators. It caused by different service life of the analysed transformers and different values of load factors. This indicates the need to consider the influence of these factors when correcting the maximum permissible values of oil indicators. Also, the presence of displacement between the distribution densities of some indicators of usable oil in 110 kV transformers and 330 kV autotransformers has been revealed. It indicates a different intensity of oxidation reactions in transformers with different voltage class. In order to reduce the heterogeneity of initial data the procedure of statistical processing of in-service test results has been proposed as a method. This procedure combines the use of a priori information about the service life of equipment and values of load factors with the elements of statistical hypothesis testing. The results of the analysis of the distribution laws of transformer oil indicators with different states have shown that for both usable and unusable oil the values of oil indicators obey the Weibull distribution. Values of the shape and scale parameters for each of the obtained indices arrays have been obtained, as well as calculated and critical values of the goodness-of-fit criteria. Practical value. Obtained values of the distribution law parameters of the transformer oil indicators with different states, considering the service life and operating conditions allow to perform the correction of the maximum permissible values of the indicators using the statistical decision-making methods.

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Improved Methods for Diagnosing an Autotransformer with a Defect in a High-Voltage Bushing

Zaitsev,

Kishnevsky,

Oborskyi

et al. 2023

Lecture Notes in Mechanical Engineering

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The Correlation of Transformer Oil Electrical Properties with Water Content Using a Regression Approach

Cited by 21 publications

References 32 publications

Modification of the Maxwell–Wagner Heterogeneous Dielectric Model for Heterogeneous Polymers and Emulsions

Modification of the Maxwell–Wagner Heterogeneous Dielectric Model for Heterogeneous Polymers and Emulsions

Analysis of distribution laws of transformer oil indicators in 110-330 kV transformers

Improved Methods for Diagnosing an Autotransformer with a Defect in a High-Voltage Bushing

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