Figure 9-10 shows the variation law of how the AC
component and DC component in the breakdown voltage at
different temperatures changes as the pulsation coefficients
change. Through the curves in the figure, we can see that,
when the temperature is between 70~110 ℃ , the AC
component in the breakdown voltage changes slightly,
however, when the temperature is above 110 ℃ , the
breakdown voltage decreases sharply. To DC component, the
changes is slight in 70~90℃. However, the DC component
decreases obviously when the temperature is above 90℃, i.e.
the decrease of the breakdown voltage of oil-paper in
90~110℃ mainly because the reduce of the DC component.