Time Optimization of Dielectric Response Measurements (original) (raw)

2005

Abstract

Determination of moisture in paper and pressboard of HV apparatus insulation is a feature of dielectric response method. Dielectric spectroscopy in frequency (FDS) and in time (PDC and RVM) domain are forms of dielectric response measurements. However one disadvantage of this method is the time consuming procedure. It takes several hours and shorter procedures give information only with lower accuracy. In this paper is shown that the transformation of data from time domain gives frequency domain data with sufficient accuracy in the low frequency range. Hamon has shown that with the data of polarization current at a time t the dielectric loss at a frequency f=0.1/t can be calculated. This means data of 1000s represent data of 0.1mHz. The proposed measurements of dielectric response are performed from 1kHz to 10mHz with FDS method and from 1s to 1000s with PDC method. This saves time of dielectric measurements and gives reliable data for the determination of the moisture content of so...

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