Journal ArticleDOI
Cellulose insulation in oil-filled power transformers: Part I - history and development
T.A. Prevost,T.V. Oommen +1 more
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A brief discussion on the development of electrical grade paper/pressboard for transformer use from the raw materials, improvements made, and particularly the use of thermal upgrading agents to extend the useful life of transformers is presented in this article.Abstract:
This paper presents a brief discussion on the development of electrical grade paper/pressboard for transformer use from the raw materials, improvements made, and particularly the use of thermal upgrading agents to extend the useful life of transformersread more
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Proceedings ArticleDOI
Diagnosis of present-day cellulosic insulating materials used in electrical power industry
TL;DR: A simple equation to predict dielectric strength using ASTM electrode system, considering the effect of stray or edge capacitances has been proposed for cellulosic insulating materials like diamond dotted paper, paper phenolic sheets, cotton phenolic sheet, leatheroid, and presspaper which are in use present time as discussed by the authors.
Journal ArticleDOI
Investigations of the Applicability of Oil-Palm Empty Fruit Bunch as Paper Insulation in Transformers
TL;DR: In this article , empty fruit bunch (EFB) is regarded as waste in the oil palm industry and is abundantly available as a renewable energy source, particularly in Southeast Asian countries.
Journal ArticleDOI
Mechanism study of the conductivity characteristics of cellulose electrical insulation influenced by moisture
TL;DR: In this article , the microscopic mechanism of moisture changing the characteristics of charge transport in cellulose insulation and attempts to reveal the related conductivity mechanism was investigated and several simulation and experimental methods were utilized comprehensively.
Proceedings ArticleDOI
Investigating the Effect of Aging on Space Charge Dynamics in Oil-Impregnated Paper Insulation
TL;DR: In this paper , a PEA (Pulsed Electro-Acoustic) technique is used to estimate the trapped charge density and electric field distribution across the test samples, and a noticeable space charge density was observed within fresh (unaged) oil-impregnated sample if compared with the aged oil-imregnated paper samples.
Proceedings ArticleDOI
Breakdown characteristics of thermally degradated oil-impregnated insulation
TL;DR: In this article, the authors investigated the possible changes of time-to-breakdown of OI insulation characterized by different levels of thermal aging and showed that the breakdown voltage remains constant over the period of thermal ageing.
References
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Journal ArticleDOI
Evaluation of the Thermal Stability of Electrical Insulating Paper
TL;DR: In this article, a laboratory method for evaluating the thermal stability of chemically treated insulating paper is presented that measures the performance at various stages of deterioration, makes direct numerical comparisons, and can be used to establish specifications for the treated paper used to build 65°C-rise transformers.
Journal ArticleDOI
History of Transformers
TL;DR: In this paper, the basic elements of transformers, including two independent coils and a closed iron core, are described and compared to the transformer energy distribution networks that are used today, from experimental devices of the 1830s to the first transformer systems of the 1880s.
Journal ArticleDOI
A Century of Progress in Electrical Insulation 1886-1986
TL;DR: In this article, a 100-year review examines the development of electrical insulation subdivided into materials, test methods and standards, and concludes that electrical insulation can be classified into three categories:
Journal ArticleDOI
Transformer Invented 75 Years Ago
A. A. Halacsy,G. H. von Fuchs +1 more
TL;DR: A brief history of the early days of the transformer's development is presented in this paper, where the first commercial installation of a transformer was celebrated 75 years ago, and the first transformer was installed in a commercial building.
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Review of chemical indicators of degradation of cellulosic electrical paper insulation in oil-filled transformers
A.M. Emsley,G.C. Stevens +1 more