Modeling of Dielectric Dissipation Factor Measurement from Very Low to Power Frequency

Abstract

In this paper, an experimental study followed by equivalent circuit modeling for dielectric dissipation factor (DDF) or tanδ measurement over the power frequency (50 Hz) to very low frequency (0.1 Hz) range is presented. Here, the dielectric loss is investigated using two different short sections of service-aged 11-kV cross-linked polyethylene cable, and later the experimental result is validated by employing the extended Debye and Cole-Cole model. The implemented model is realised by a number of parallel R-C relaxation branches, where each branch represents a distinct polarising event. In the modeling, Debye relaxation complies with the experimental DDF at the higher frequency; however, for the low frequency zone, the calculated value from the simulated model deviates from the experimental result. On the other hand, the DDF response from the Cole-Cole model matches well with the measurement at all tested frequencies. Finally, the implementation of Jonscher power law regarding conductivity improves the modeling performance.