Effect of Aging Degree on Partial Discharge Degradation of Oil-paper Insulation

This study conducts thermal aging treatment to study the effect of thermal aging on the PD degradation process of the oil-paper insulation. The partial discharge inception voltages, extinction voltages, carbon mark, and microscopic morphology of samples are analyzed. The results show that thermal ag...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2021-12, Vol.28 (6), p.2099-2107
Main Authors: Wang, Yongqiang, Wang, Ziqi, Zeng, Zhuo, Fei, Ruoyu, Shang, Jing
Format: Article
Language:English
Subjects:
Aging
Carbon
Degradation
Dielectric barrier discharge
Discharges (electric)
Electric contacts
Electric fields
Electron bombardment
Heat treatment
Horizontal orientation
Insulation
Nondestructive testing
Oils
paper insulation
Partial discharges
Surface discharges
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Summary:This study conducts thermal aging treatment to study the effect of thermal aging on the PD degradation process of the oil-paper insulation. The partial discharge inception voltages, extinction voltages, carbon mark, and microscopic morphology of samples are analyzed. The results show that thermal aging does not reduce the partial discharge inception voltages of oil-paper but can make the spark produced in the oil-paper more difficult to extinguish. At the initial stage, thermal aging has little effect on the development of partial discharge in normal direction of samples, while in later stages, the effect begins to appear; thermal aging reduces the insulation performance between layers of oil impregnated paper and accelerates the carbon trace growth rate in the horizontal direction. In this model, the first layer is most severely bombarded by electrons, and this layer is most obviously affected by the electric field in the normal direction at the contact point between the electrode and the insulating paper. The lower layer is affected by the horizontal and vertical electric fields; therefore, a large area of fiber looseness occurs on the surface of the oil impregnated paper. The degree of deterioration is proportional to the endurance time and aging time, and the damage degree of oil impregnated paper decreases with the increase of the number of layers.
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2021.009611