Search

Your search keyword '"Liu, Fujia"' showing total 11 results
Start Over Author "Liu, Fujia" Publisher ieee
11 results on '"Liu, Fujia"'

8. A method of reducing streaming electrification at oil inlet by EHV transformers

Author

Liu Fujia, Jin Chong-Jun, and Yang Jia-Xiang

Subjects
Engineering, geography, geography.geographical_feature_category, Petroleum engineering, Transformer oil, business.industry, Two step, Electrical engineering, Electrostatics, Inlet, Pipe flow, law.invention, chemistry.chemical_compound, Electrification, chemistry, law, Petroleum, business, Transformer
Abstract

In this paper, the velocity field of EHV power transformer oil has been calculated in one step and two step section pipe models. As a result of these calculations, the optimal configuration of the oil inlet is determined to be that of a fluted cone. >

Published
2002

9. Study of influence of corona discharge on streaming electrification of transformer oil

Author

Yang Jia-Xiang, Liu Fujia, Chi Xiao-Chun, and Li Zhonghua

Subjects
Materials science, Transformer oil, business.industry, Polarity symbols, Analytical chemistry, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Distribution transformer, Oil cooling, Physics::Fluid Dynamics, Partial discharge, Corona ring, Optoelectronics, business, Corona discharge, Polarity (mutual inductance)
Abstract

The influence of corona discharge on streaming electrification by flowing transformer oil has been studied by means of a test model. The polarity effect of the charge density in the oil under applied DC voltage has been analyzed. When AC voltage is applied to the needle electrode of the needle-ring electrode system, the charge density in the transformer oil increases with increase of the amplitude of the AC voltage. When DC voltage is applied the polarity effect of the charge density occurs in the transformer oil, that is, when the DC voltage is of positive polarity, the charge density in the oil keeps increasing all the time. However, when the DC voltage is of negative polarity, the charge density in the oil changes from positive polarity at lower DC voltage to negative polarity at higher DC voltage. The test results obtained are useful for the design, manufacture, and operation of large power transformers with forced circulating oil cooling. >

Published
2002

Catalog

Books, media, physical & digital resources
See catalog results