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Investigation on bubbling phenomenon in oil-paper insulation
IEEE Transactions on Dielectrics and Electrical Insulation, 2017Bubbling phenomenon usually arises from overheated cellulose insulation in oil, which is known for deleterious effects on the insulation strength of oil-immersed transformers. In this paper, the experiment was conducted on a self-heating conductor wrapped with insulation paper.
Meng Gao +5 more
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Dielectric properties of rapeseed oil paper insulation
2007 Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, 2007This paper presents the basic physical, chemical and electrical properties of a type of rapeseed oil based dielectric liquid. Dielectric properties including relative dielectric permittivity, dissipation factor, and breakdown voltage of the rapeseed oil paper insulation are presented and also compared with those parameters of mineral transformer oil ...
null Jian Li +3 more
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Drying of already impregnated oil-paper insulation
Proceedings of Conference on Electrical Insulation and Dielectric Phenomena - CEIDP '96, 2002It is well known that oil-paper insulation is prepared, such that the paper installed in the high voltage apparatus is first dried with the influence of the high vacuum and elevated temperature. Then, under vacuum the paper is impregnated with oil.
L.M. Nikoloski, D.D. Hristovski
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Moisture diffusion invegetable oil-paper insulation
2011 IEEE International Conference on Dielectric Liquids, 2011Vegetable insulating oils are fire-resistant and environment-friendly liquid dielectrics. This paper presents an experiment system to simulate moisture diffusion in oil-paper insulation system based on vegetable insulating oils. A mathematical model is presented for moisture diffusion in vegetable oil-paper insulation based on the Fick's second law. By
null Zhaotao Zhang +3 more
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IEEE Transactions on Dielectrics and Electrical Insulation, 2020
In this paper, a method of aging diagnosis under different oil-paper ratios is proposed by investigating the accelerated thermal aging data with different oil-paper ratios. Aged oil-paper insulation samples with oil-paper ratios of 10:1, 15:1 and 20:1 are obtained by accelerated thermal aging tests.
Yongkuo Zhou +3 more
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In this paper, a method of aging diagnosis under different oil-paper ratios is proposed by investigating the accelerated thermal aging data with different oil-paper ratios. Aged oil-paper insulation samples with oil-paper ratios of 10:1, 15:1 and 20:1 are obtained by accelerated thermal aging tests.
Yongkuo Zhou +3 more
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Discharges in combined transformer oil/paper insulation
Proceedings of 1999 IEEE 13th International Conference on Dielectric Liquids (ICDL'99) (Cat. No.99CH36213), 2003Discharge signatures and breakdown levels have been recorded for combined transformer oil/impregnated paper insulation subjected to AC high voltage. Different electrode geometries have been studied, varying from the point-plane gap to a semi-homogeneous sphere-plane configuration.
G. Berg, L.E. Lundgaard
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Research of electrophysical properties of oil-paper insulation
Proceedings of the 2014 15th International Scientific Conference on Electric Power Engineering (EPE), 2014The transformer plays an important role in providing a reliable and efficient electricity supply and is one of the most critical equipment in electric power transmission and distribution systems. The mineral oil paper insulation system is successfully used in transformers for many years.
Lukas Lison +3 more
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Condition assessment of oil-paper insulated bushings
2009 IEEE Electrical Insulation Conference, 2009Bushings failures are responsible for a large number of costly forced outages of transformers, breakers and reactors. Almost half of the bushing failures are catastrophic in nature and may pose danger to personnel and other equipment in vicinity. Many techniques are available for assessing the dielectric condition of oil-paper insulated power apparatus
B. K. Gupta, John Densley, Arun Narang
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Impregnation model and experimental investigation of vegetable insulating oil-paper insulation
2014 ICHVE International Conference on High Voltage Engineering and Application, 2014Due to the fact that the viscosity of vegetable insulating oil is greater than that of mineral insulating oil, it is necessary to investigate the impregnation characteristics of vegetable insulating oil in transformer boards. The impregnation mechanism was studied using an analytical model and the impact of oil-paper insulation impregnated with the ...
null Guojun Lu +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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