Electric field behavior around an HVDC laboratory termination

Gas-solid interfaces are integral parts in insulation systems of HVDC apparatus. The DC electric field distribution in these systems can significantly vary by the change of system parameters, e.g. voltage level and gas/solid conductivity, and hence the performance of the HVDC apparatus might be considerably affected. To understand the behaviour of DC electric field in an air-solid insulation system, different voltage levels up to -600 kV DC have been applied to a dry-type HVDC laboratory termination with EPDM insulating sheds. The electric field distribution around the termination has been measured along the termination length. This paper presents and analyses those electric field measurement results. Simulations have been carried out and the results have been compared to the measurement…