Effects of thermal-electrical aging and flame retardance on flash point and breakdown voltage of insulating oil

doi:10.16265/j.cnki.issn1003-3033.2026.S1.0012

Abstract

Abstract:

In response to the increased fire risk caused by the aging of transformer insulating oil, the commercially available mineral insulating oil was selected as the research subject. Accelerated thermal aging and breakdown discharge aging tests were carried out to measure the flash points and breakdown voltages of insulating oils at different aging degrees. The results show that the breakdown voltage is affected more significantly by aging, while the flash point undergoes a relatively minor decline. The flame retardant can increase the flash point and breakdown voltage of insulating oil. After 40 days of thermal aging, the breakdown voltage of the flame-retardant insulating oil hardly changes, remaining above 50.0 kV. However, the flash point of the flame-retardant insulating oil is lower than that of the unmodified insulating oil. After 40-times continuous breakdown discharges, both the flash point and breakdown voltage of the flame-retardant insulating oil increase slightly.

Key words: mineral insulating oil, aging, flash point, breakdown voltage, flame retardance

CLC Number:

X936

Zhu Xinghua, Ma Xiang, Yuan Bo, Zhang Yi, Zhao Chengshou. Effects of thermal-electrical aging and flame retardance on flash point and breakdown voltage of insulating oil[J]. China Safety Science Journal, 2026, 36(S1): 75-80.

Figures/Tables 8

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