Electric Field Distribution in HVDC Cable Joint in Non-Stationary Conditions

Accessories such as joints and terminations represent weak points in HVDC cable systems. The DC field distribution is intimately dependent on the thermal conditions of accessory material properties. Moreover, there no available method to probe charge these conditions. In this work, non-stationary conditions, both thermally electrically, computed considering crosslinked polyethylene (XLPE) insulation different insulating materials (silicone, rubber, XLPE) for a 200 kV joint assembled same geometry. used, i.e., temperatures up 70 °C, with properties considered, dielectric time constant appears order or longer than one several hours. This indicates that physical phenomena need be considered modelling electric distribution. Both radial tangential distributions are analysed, focus given under stress cone ground side near central deflector high voltage joint. We show position maximum varies way not easy anticipate. Under cone, smallest obtained having highest electrical conductivity. results from shift towards which geometrical features produce weaker axial component field. At level deflector, it clear higher when mismatch between conductivity two insulations larger. addition, grows function stress. work shows precise data probing 3D.