PROJECT TITLE :

Quantitative study of electric conduction in mineral oil by time domain and frequency domain measurement

ABSTRACT:

Polarization and depolarization current measurement may be a non-harmful testing methodology to check the dielectric properties of insulating materials. 2 varieties of mineral oils with totally different aging times have been studied using both time domain and frequency domain strategies separately. In this paper, a unique approach to understanding the correlation between the electric conduction in time domain and frequency domain has been proposed. When the charge carriers drift to the electrodes, they'll be blocked and accumulated close to the electrode. The quantity of charge in the vicinity of electrode has been estimated. Within the depolarization period, these charge layers will come back to the bulk resulting in an exceedingly depolarization current. During this paper, an analytical resolution to the time dependence of the depolarization current has been developed and used to fit the experimental results. The field and temperature dependence of the polarization and depolarization current are used to check the characteristics of charge carriers in mineral oil. The calculated conductivity has been used to simulate the frequency response in mineral oil and therefore the simulating results have been compared with the experimental data.