Time domain dielectric response of field grading sleeves subjected to high humidity and temperatures

Abstract

It is experienced that MV XLPE cable links including heat shrink cable joints can have a high electrical conductivity compared to the XLPE cable insulation. The field grading sleeve included in the joint design is proposed to be responsible for the reduced insulation resistance and is therefore studied in this paper. New field grading sleeves are aged in the laboratory at temperatures up to 150 °C in both dry and humid conditions. The degree of ageing is determined by DSC measurements, the mechanical properties are determined by tensile strength testing, and the electric properties are characterized by time domain dielectric response measurements. The results show that after only a few days above the melting point of 104 °C the tensile strength of the material is strongly reduced. The electrical conductivity is strongly dependent on the degree of thermal ageing of the sleeve material but also the water content. The combination of significant thermal degradation and a high water content results in particularly high conductivity values. It is shown that the increase of the conductivity after ageing at 150 °C for 15 days is five orders of magnitude for wetted field grading sleeves measured at 30 °C.

A Surrogate Model for the Rapid Evaluation of Electromagnetic-Thermal Effects under Humid Air Conditions

“…Nevertheless, the work mentioned above shares a limitation: the influence of humid air on the device was not considered. Given that devices can work on rainy or windy days, the fluid field composed of the surrounding humid air also couples with the thermal field, acting together on electronic devices [17][18][19]. Therefore, it is essential to consider the coupling effects of electromagnetics, heat, and humid air to contribute to improving the accuracy of modeling and simulation for the entire system.…”