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Thermal ageing of cellulose paper insulation
1976 IEEE International Conference on Electrical Insulation, 1976Results are presented of investigations into the thermal ageing behavior of cellulose paper insulation in which tests have been carried out between 100C and 160C on well-dried samples of cellulose paper contained in sealed glass vessels in an atmosphere of initially dry nitrogen gas.
W. G. Lawson, M. A. Simmons, P. S. Gale
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Biodegradable Insulating Liquids used in Paper Oil Insulating System
2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE), 2020Biodegradable ester-based electro insulating fluids have been tested for many dielectric properties and have been proposed and already used in electric devices as the substituent for mineral oil. Some properties are advantageous as high flash and fire point (> 250°), low impact of the water content on dielectric properties (H 2 O saturation hundreds ...
Pavel Trnka +4 more
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Concentration of total sugar produced by insulating paper in oil-paper insulation system
IEEE Transactions on Dielectrics and Electrical Insulation, 2019As sugar is an important intermediate in the early stage in the degradation of cellulose, this paper proposes to use the concentration of total sugar as an indicator of the degree of aging of insulating paper in an oil-paper insulation system. The oil-paper insulation system was simulated at 90, 100 and 110°C, and total sugar concentration in ...
Chen Chen +3 more
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IEEJ Transactions on Electrical and Electronic Engineering, 2020
The transformer is a core device of the power system, and it is generally considered that the aging of insulating paper is important to the transformer. The aging process of insulating paper is the degradation process of cellulose. If it can be detected regularly, the aging of oil–paper insulating systems can be monitored conveniently.
Chen Chen +3 more
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The transformer is a core device of the power system, and it is generally considered that the aging of insulating paper is important to the transformer. The aging process of insulating paper is the degradation process of cellulose. If it can be detected regularly, the aging of oil–paper insulating systems can be monitored conveniently.
Chen Chen +3 more
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Mechanical uniformity of paper-insulated cables
Electrical Engineering, 1938Application of a recently developed method whereby it is possible virtually to see the voids in the layer structure of high voltage cable insulation shows most such insulation to be mechanically irregular. Lack of mechanical uniformity in the cable as manufactured is responsible for much of the ionization after the load cycle, and probably to a great ...
K. S. Wyatt, D. L. Smart, J. M. Reynar
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Aging of Transformer Insulation Paper
Journal of Macromolecular Science, Part A, 1996Abstract As a transformer ages, the chemical and physical properties of the cellulose insulation materials in the transformer change, and the paper loses its strength and becomes brittle. The average molecular weight of the cellulose chains decrease with age, and degradation products are formed, including water, carbon monoxide, carbon dioxide, and ...
Tri T. Le +2 more
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Tests of paper-insulated high-tension cable
Journal of the A.I.E.E., 1926The paper deals with those tests which are involved in specifications. The discussion is from the standpoint of the purpose and significance of the various standard tests which are made rather than that of the technique of the details of testing. A considerable number of data are given. The subjects treated are purpose and importance of tests of cable;
C. L. Dawes, P. L. Hoover
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Oil stresses in impregnated-paper insulation
Electrical Engineering, 1945RECENT EXPERIMENT on fully impregnated cable-type paper insulation, has shown that under certain conditions use of a paper of low density results in a higher dielectric strength than does the use of a paper of higher density.1 It has also been shown that failure of such insulation usually begins in the oil channels between successive turns of paper ...
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Electro-insulating Paper Degradation in Various Electro-insulating Fluids
Revista de Chimie, 2018The durability and safe operation of electrical equipment and devices with mixed insulation systems (solid/fluid - electro-insulating paper/oil) is determined by the insulation aging under simultaneous and synergic actions of electrical, thermal and chemical stress factors etc. In this context, degradations of insulating paper exposed to thermal aging
Iosif Lingvay +4 more
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Electrical Engineering, 1931
THIS abstract of a preliminary report gives some results of a study of the life of impregnated paper insulation under way at the School of Engineering, Johns Hopkins University. The work is being supported by the subcommittee on impregnated paper-insulated cable research of the National Electric Light Association.
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THIS abstract of a preliminary report gives some results of a study of the life of impregnated paper insulation under way at the School of Engineering, Johns Hopkins University. The work is being supported by the subcommittee on impregnated paper-insulated cable research of the National Electric Light Association.
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