Search

Showing total 16,977 results
Start Over Search Limiters References Available Journal ieee access Publisher institute of electrical and electronics engineers (ieee)
16,977 results

43. Influence of Aging on Creepage Discharge Characteristics of Oil-Paper Insulation Under AC-DC Combined Voltage

Author

Liang Bin, Zhou Yuanxiang, and Jin Fubao

Subjects
Aging, Materials science, General Computer Science, 020209 energy, 02 engineering and technology, 01 natural sciences, law.invention, Dc voltage, law, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Arc flash, creepage discharge, General Materials Science, Composite material, Transformer, 010302 applied physics, AC-DC combined voltage, General Engineering, inception voltage, Electrode, oil-paper insulation, lcsh:Electrical engineering. Electronics. Nuclear engineering, Stage (hydrology), DC voltage component, lcsh:TK1-9971, Voltage
Abstract

There is a relative lack of research on the development of creepage discharge in aged oil-paper insulation subjected to AC-DC combined voltage in converter transformers. In this study, based on the physical and chemical properties of oil-paper, we propose a sphere-plate electrode model to study the creepage discharge parameters and characteristic spectra of aged oil-paper subjected to AC-DC combined voltage. The results show that the creepage discharge inception voltage of aged oil-paper is related to the AC voltage component of the AC-DC combined voltage. However, when the DC voltage component is 60 kV, the flashover phenomenon was found to occur in one of the severely aged samples before the AC voltage was applied. Despite being subjected to the same DC voltage, the flashover phenomenon did not occur in three other samples aged to different degrees. Large-amplitude discharges were found to appear earlier in the severely aged samples. At the same creepage discharge stage, as the aging time of the oil-paper increased, the number of large-amplitude discharges was found to rapidly increase, and the time interval between adjacent discharges was found to gradually decrease. At each stage of the creepage discharge, the small-amplitude discharge has a “hump” shaped distribution. The larger the DC voltage component, the shorter the endurance time of aged oil-paper, and the more severe the damage to the oil-paper. The DC voltage component was found to have an accelerating effect on the development of creepage discharge in aged oil-paper insulation.

Published
2021