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Investigating the effect of temperature gradient on field distribution in polymeric MV-HVDC model cable through simulation and space charge measurement
Abstract
One of the major issues in the development of synthetic insulation HVDC cables is space charge accumulation in the insulation and the consequent distortion of the electric field under voltage. In addition, the current flow through the conductor is a source of heat which results in a temperature gradient and therefore a conductivity gradient along the cable insulation radius because the electrical conductivity of polymeric materials is mostly an increasing function of temperature. Also, the conductivity is field dependent, in a field range covering the design field of DC cables. To satisfy a constant current flow across the cable radius under steady state condition, such situation necessarily results in a redistribution of the electric field and therefore an accumulation of space charge within the bulk of the insulation. The aim of the present contribution is to investigate the influence of temperature gradient on the accumulation of space charge and distribution of electric field in polymeric MV-HVDC model cable through simulation and measurements.