Study on the effect of impulse voltage withstandability on the thermally-aged transformer paper

Murthy, T.S.R.; Yugandhar, U.; Gupta, S.C.; Bhoomaiah, A.; Kuntia, J.S.

doi:10.1109/elinsl.2004.1380436

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…It is interesting to note that there are some similar reports on ageing effects on the dielectric characteristics of pressboard insulation in the literature. For example, in laboratory accelerated aged paper where the breakdown strength of the paper remains almost unchanged even after 6 months of ageing at 120 °C [8]. It is found that density has a significant effect on the breakdown voltage of the paper regardless of ageing years as shown in Figure 3.…”

Section: Figure 2breakdown Voltage Of Service Aged Paper Impregnatedmentioning

confidence: 85%

Examining dielectric properties of paper ageing in scrapped transformers

Badr¹,

Nasrat²,

Ibrahim³

2015

International Journal of Innovative Research in Electrical, Ele

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Experimental Study of degradation of oil impregnated paper has attracted enormous attention over the past 20 years worldwide. Outside the controlled conditions of the laboratory, however the real situation is more complex due to loading change, ambient temperature, fluctuation and sudden impulse impact. Therefore, interests in forensic examinations of scrapped old transformers have increased in recent years since it may be a way to obtain under-service ageing information and connecting the laboratory ageing experiment with the reality. This paper presents the effect of ageing on the breakdown voltage and examines the effect of oil quality on the breakdown voltage of the paper. Tests results of service-aged papers taken from three failed power transformers. The result indicated that ageing has a small reduction effect on the breakdown voltage, whereas the breakdown voltage is affected more by the density of the paper and the quality of the oil.

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Section: Figure 2breakdown Voltage Of Service Aged Paper Impregnatedmentioning

confidence: 85%