In order to measure the moisture content of oil-paper insulation more accurate

and explore the influence of acid on moisture content measurement

thus providing reliable guidance for insulation condition assessment of transformer

in this paper

we made two groups of oil-paper insulation samples with different moisture content and acid value under laboratory conditions and studied the influence of organic acids on moisture by using polarization/depolarization current. The results show that moisture content will have effect on the distribution of acetic acid between oil and paper

but no effect on stearate; acetic acid and stearate have different influences on depolarization current curves

acetic acid has effect on the tail of depolarization current curves

while stearate mainly impact the first stage of depolarization current curves; acetic acid and stearate affect moisture content of oil and insulating-paper respectively

and there is a certain proportional relationship

so we can consider some compensation method to obtain the accurately moisture content of different parts of oil-paper insulation in practice.