Influence of temperature and thermal aging on breakdown voltage of oil-paper insulation

As the important part of the transformer insulating, the insulation performance of oil-paper directly affects the security and stable operation of the transformer. In order to study the influence of temperature and thermal aging on the breakdown voltage of oil-paper insulation, breakdown voltage test of transformer's oil-paper was carried out, and breakdown voltages of oil-paper insulation were obtained at different temperatures and different stages of thermal aging. Weibull distribution was used to analyze the breakdown voltage data and the influence of temperature and thermal aging on the breakdown voltage of oil-paper. Experimental results showed that the rise in temperature reduces the breakdown voltage and the dispersion of the breakdown voltage data becomes bigger at higher temperatures. Increasing thermal aging time, breakdown voltage has a small decline trend and occasionally increases in some situations.