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Relevant bibliographies by topics / Moisture in transformers

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Journal articles

Academic literature on the topic 'Moisture in transformers'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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Journal articles on the topic "Moisture in transformers"

1

Rexhepi, Vezir, and Petar Nakov. "Condition assessment of power transformers status based on moisture level using fuzzy logic techniques." Journal of Mechatronics, Electrical Power, and Vehicular Technology 9, no. 1 (2018): 17. http://dx.doi.org/10.14203/j.mev.2018.v9.17-24.

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Power transformers are one of the most expensive components; therefore the focus on their status and its continuous operation is the primary task. In the power systems, condition assessment of performance and reliability is based on the state of components, measurements, testing and maintenance as well as their diagnosis. Hence, condition assessment of power transformer parameters is the most important regarding their status and finding incipient failures. Among many factors, the most factors that affects the safe operation and life expentancy of the transformer is the moisture in oil. It is k

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2

Suleiman, Abubakar Abdull, Rubiatul A. B. Zainir, Nor Asiah Muhamad, and Nouruddeen Bashir. "Comparative Study on Effect of Temperature & Moisture on Transformer Insulation Conductivity." Applied Mechanics and Materials 284-287 (January 2013): 1126–30. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.1126.

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It has been acknowledged that the insulation of the power transformers is the main cause of their failures. This can easily be attributed to the fact that all power transformers connected to electrical power networks bears loads and the load causes temperature rise and degradation of the cellulose paper. The by-product of the degradation includes moisture. The high temperature and moisture combine to accelerate the rate of insulation breakdown by increasing the material conductivity, σ and also increase the aging rate of the transformer. This paper has reviewed some transformer assessments and

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3

Sutan Chairul, Imran, Yasmin Hanum Md Thayoob, Young Zaidey Yang Ghazali, Mohd Shahril Ahmad Khiar, and Sharin Ab Ghani. "Formation and Effect of Moisture Contents to Kraft Paper’s Life of In-Service Power Distribution Transformer." Applied Mechanics and Materials 793 (September 2015): 114–18. http://dx.doi.org/10.4028/www.scientific.net/amm.793.114.

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Examples of solid and liquid electrical insulations for power transformer are mineral oil and cellulose based paper. As transformers performed their function to step-up or step-down voltage level, its’ insulations will be degraded. Paper insulation is considered the most critical component in a transformer insulation system because it is not easily replaced if compared to oil where it is easily reconditioned in-order to remove water and contaminants. Studies show that temperature, moisture contents and oxygen contributed to paper insulation degradation. Moisture and furanic compound were produ

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4

Gavrilă, Doina Elena, Ilies Ciprian, and Horia Catalin Gavrilă. "Applying the Recovery Voltage Method (RVM) to Study the Degradation of High Power Transformer Insulation." Advanced Materials Research 911 (March 2014): 260–65. http://dx.doi.org/10.4028/www.scientific.net/amr.911.260.

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Good operation of power transformers is very important because they are among the most expensive equipment in the network generation, transmission and electricity distribution. It became necessary regular monitoring of such systems and determinate the life of a transformer, it preventing breakdown and corresponding loss occurrence.Ageing in the insulation system of power transformers is determinate by influence of air, moisture, temperature, mechanical and electrical stresses and insulation contamination. One of the most important ageing indicators in transformers is the water content in the s

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5

M.Jamail, N. A., N. A. Azali, E. Sulaiman, Q. E. Kamarudin, S. M. N. S. Othman, and M. S. Kamarudin. "Breakdown Characteristic of Palm and Coconut Oil with Different Moisture." Indonesian Journal of Electrical Engineering and Computer Science 12, no. 1 (2018): 363. http://dx.doi.org/10.11591/ijeecs.v12.i1.pp363-369.

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<p>Oils acts as insulation and cooling agent in the transformer. Petroleum-based oils are widely used in transformers due to their qualified properties as good insulation materials. Unfortunately, the used of petroleum-based oils has adverse effects on environment in the event of any failure to transformers such as tank leakage or explosions. Therefore, researchers have been studied and have found environmentally friendly oil that is suitable as substitutes in transformer. Thus, breakdown voltage tests using direct current and alternating current with the addition of different water cont

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6

Gutten, Miroslav, Daniel Korenciak, Peter Brncal, and Roman Jarina. "Frequency Diagnostics of Insulating System of Power Transformers." Electrical, Control and Communication Engineering 16, no. 1 (2020): 1–7. http://dx.doi.org/10.2478/ecce-2020-0001.

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AbstractThe paper presents experimental diagnostics of the oil-paper insulating system of power transformers using progressive frequency method. The first part of the paper deals with the basic information about diagnostics of power oil transformers. The second part of the paper deals with the use of frequency domain spectroscopy (FDS) for power oil transformers. This method is used in the analysis of insulating condition of power transformer with the system of oil-paper. It was found that the results of these tests are highly influenced by the operating temperature during the experimental mea

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7

Gizzatova, I. D., V. K. Kozlov, and D. M. Valiullina. "Determination of the true water content, the nature of the impurities and their concentration in transformer oil." E3S Web of Conferences 124 (2019): 05005. http://dx.doi.org/10.1051/e3sconf/201912405005.

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During the operation of transformers, the insulating oil is aging, therefore, there is the deterioration of its insulating properties, which is determined by multiple physico-chemical processes. The most dangerous factor, from the point of view of preserving the operational reliability and resource of a power transformer, is the moisture content of the insulation. Most methods for determining moisture content have measurement errors. These errors are largely dependent on impurities that are contained in the oil. The modified Fisher method proposed in the article allows determining the amount o

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8

Zhang, Yiyi, Jiaxi Li, Xianhao Fan, Jiefeng Liu, and Heng Zhang. "Moisture Prediction of Transformer Oil-Immersed Polymer Insulation by Applying a Support Vector Machine Combined with a Genetic Algorithm." Polymers 12, no. 7 (2020): 1579. http://dx.doi.org/10.3390/polym12071579.

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The support vector machine (SVM) combined with the genetic algorithm (GA) has been utilized for the fault diagnosis of transformers since its high accuracy. In addition to the fault diagnosis, the condition assessment of transformer oil-immersed insulation conveys the crucial engineering significance as well. However, the approaches for getting GA-SVM used to the moisture prediction of oil-immersed insulation have been rarely reported. In view of this issue, this paper pioneers the application of GA-SVM and frequency domain spectroscopy (FDS) to realize the moisture prediction of transformer o

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9

Vasilevskij, V. V., and M. O. Poliakov. "Reproducing of the humidity curve of power transformers oil using adaptive neuro-fuzzy systems." Electrical Engineering & Electromechanics, no. 1 (February 23, 2021): 10–14. http://dx.doi.org/10.20998/2074-272x.2021.1.02.

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Introduction. One of the parameters that determine the state of the insulation of power transformers is the degree of moisture content of cellulose insulation and transformer oil. Modern systems of continuous monitoring of transformer equipment have the ability to accumulate data that can be used to reproduce the dynamics of moisture content in insulation. The purpose of the work is to reproduce the curve of the of humidity of transformer oil based on the results of measuring the temperature of the upper and lower layers of oil without the need for direct measurement of moisture content by spe

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10

Gutten, M., M. Šebok, D. Korenčiak, et al. "Frequency Domain Diagnostics of Transformer Insulation." Devices and Methods of Measurements 10, no. 4 (2019): 353–59. http://dx.doi.org/10.21122/2220-9506-2019-10-4-353-359.

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The first part of paper deals with the base information about diagnostics of power transformers. In this part are presented differently insulating methods, for example method of recovery voltage method, method of polarization and depolarization currents and chromatographic analysis.The second part of paper deals use of method of frequency domain spectroscopy for oil power transformers. This method is used in analysis insulating condition of power transformer with system of oil-paper. It was found, that the results of these tests are highly impacted by the operating temperature during the exper

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