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Power-factor testing of transformer insulation
Electrical Engineering, 1941This paper points out a method for analyzing the results obtained from dissipation-factor tests of transformer insulation. Experimental data, obtained both from transformer tests, extending over the past three years, and from tests of sample insulation, indicate a definite relation between resistance and capacitance, with varying conditions of ...
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Gas-insulated power transformers
Proceedings of the IEE Part A: Power Engineering, 1960Power transformers have reached such a degree of perfection that it seems unlikely that there is room for substantial improvement in any fundamental characteristic. However, the insulation of conventional transformers is in the main dependent upon a liquid which is not only inflammable but has other undesirable characteristics.
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Analyzing method efficiency for power transformers insulation design
Eurocon 2013, 2013Insulation dimensioning requires accurate calculation of dielectric stress levels. These need to be conducted for various critical electrode configurations inside a transformer under different voltage test levels. Advanced computational tools are being used to estimate stress levels, which can then be compared to standard withstand levels.
Kosjenka Capuder +2 more
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IEEE Transactions on Electrical Insulation, 1986
Large efforts are made to improve transformer insulation. The countermeasure for partial discharge in transformer is the most important item, while the flow electrification is new problem. These topics are described in this chapter.
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Large efforts are made to improve transformer insulation. The countermeasure for partial discharge in transformer is the most important item, while the flow electrification is new problem. These topics are described in this chapter.
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Assessment of power transformer insulation condition
Proceedings: Electrical Insulation Conference and Electrical Manufacturing and Coil Winding Conference (Cat. No.01CH37264), 2002In order to make the best decisions about managing the serviceability of a huge aged transformer population, it is imperative to understand the condition of the equipment. Functional-based methodologies that consider the assessment of the condition of transformer insulation on the relevant safety margins are discussed based on practical experience ...
V. Sokolov, V. Bulgakova, Z. Berler
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Diagnosis of Power Transformer Insulation
2006 IEEE 8th International Conference on Properties and applications of Dielectric Materials, 2006Diagnosis of power transformers becomes important due to the age of the transformer in service. Diagnosis methods can be separated in integral or differential methods. Gas-in-oil analysis is a well known diagnosis method and gives information on different failures.
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Novel Insulation system in power transformer
2012 IEEE 10th International Conference on the Properties and Applications of Dielectric Materials, 2012The service life of a power transformer is governed by the condition of the insulating material. Due to deterioration of the transformer insulating material, the dielectric strength decreases and reduces the ability of the transformer to withstand Voltages.
M Aruna. +3 more
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2008 IEEE Region 10 and the Third international Conference on Industrial and Information Systems, 2008
This paper presents the experimental results of a study, which has been carried out to analyze the insulation characteristics of coconut oil in order to check the suitability as the liquid insulation in power transformers. In this study dielectric response measurements were carried out in Frequency domain at temperatures of 25 °C, 50 °C, 80 'C.
Ranawana, S. +4 more
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This paper presents the experimental results of a study, which has been carried out to analyze the insulation characteristics of coconut oil in order to check the suitability as the liquid insulation in power transformers. In this study dielectric response measurements were carried out in Frequency domain at temperatures of 25 °C, 50 °C, 80 'C.
Ranawana, S. +4 more
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Measurements of dielectric stress in EHV power transformer insulation
IEEE Transactions on Power Delivery, 1995A relatively high failure rate of the internal insulation of EHV power transformers has been reported by public utilities. This prompted a study of the safety margin of EHV transformers in service and under test. In this project, a number of transient overvoltages were digitally recorded in EHV substations and the transient voltage distribution along ...
C. Vailles +3 more
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Cooling and insulation design of power electronic transformers
Applied and Computational Engineering, 2023In the case that the usage of power electronic transformers (PETs) has become a trend, research on minimizing the energy loss of PETs is imperative. Meanwhile, the miniaturization of PETs was considered a meaningful way to relief the problem to the maximum extent. And in the problems of miniaturization, the insulation design and the cooling-down design
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