In view of the current limitation of measurement method for the moisture content of pressboard internal transformer structure of oil paper insulation

the broadband dielectric response method is used to realize non-destructive transformer insulation pressboard moisture measurement. The XY equivalent model is used to simulate the main insulation structure of actual transformer

and the moisture content in pressboard can be fitted by frequency domain dielectric spectrum measurement. Meanwhile

test insulation pressboard moisture of oil paper insulation system in different temperature comparison of the test results is obtained with the traditional chemical titration method. It can be seen that test results using broadband dielectric response method are consistent with the data of pressboard moisture content using traditional chemical method

which can meet the requirements of pressboard moisture nondestructive measurement in the internal insulation of power transformers.