Part II of the paper shows the effect of temperature and electric field on the space charge accumulation (bulk and superficial charge) in direct current cable joints with Ethylene-propylene rubber/Cross–linked polyethylene insulation. The bulk charge was determined by using some electroacoustic pulses (the pulsed electroacoustic method (PEA)) and the superficial charge was determined experimentally - from the measured bulk charge - , as well as by computation - using the electrical conductivity and permittivity. The results show that both the electric field and the temperature increase the space charge values. Moreover, even after the voltage cancellation, there are residual charges that produce a residual electric field, whose values can be higher than the partial discharges and/or electrical treeing inception values.

Keywords: Dc cable joints, Cross-linked polyethylene, Ethylene-propylene rubber, Space charge, Electric field, Electrical conductivity.