Evaluation of the Electric Field of a Single-Core Power Cable at the Inner Conductor Radius

Dielectric strength is a very important parameter for cables. It can vary according to temperature and frequency. The complex electrical permittivity of the Cross-linked polyethylene (XLPE) and Copper Polyester/Mylar band layers of a cable determine the maximum electric field created inside the cable operating at sinusoidal voltage. The value of this electric field should be less than the dielectric strength of the materials used. The electrical characteristics of XLPE and Copper Polyester tape depend on frequency and temperature. In a power cable, the temperature depends on the radial position, which makes it difficult to calculate the cable’s electric field. In this study, it was shown how to calculate the electric field of the cable by using XLPE and Copper Polyester band data taken from the literature and numerical integration. It was found that the calculated value is less than the Dielectric strength value of XLPE material. It has been shown how the electric field of the power cable under investigation changes according to frequency and temperature.