Abstract
A scientific consensus is emerging on the benefits of direct current (DC) distribution in medium voltage (MV) power systems of ships and cities. At least 50% space savings and increased power transfer capacity are estimated with enhanced voltage DC operation of electric cables. The goal of this research is to contribute to developing the empirical knowledge on the insulation performance in order to validate the feasibility of such anticipated gains of DC versus alternating current (AC), and to determine the comparative impact of different operational conditions from a component engineering point of view. The partial discharge (PD) activity in cables is measured under AC and DC conditions as an indicator of insulation performance. Specifically, PDs in defects at the semicon-insulation interface are studied in terms of inception voltage, repetition rate and discharge magnitude. Empirical understanding is drawn for operating voltage and frequency dependence of the discharge behavior in such voids in the range of 10 to 20 kV and 0 to 0.1 Hz, respectively. The change in PD activity with void evolution post temperature-induced ageing process is explored.
Highlights
In shipboard power systems, space limitations make direct current (DC) a favorable option, as compared to alternating current (AC), as this can lead to reduction in cable size for the same power level [1,2]
In urban areas, need for compact power redirection with emerging energy intensive distributed resources is driving the necessity of medium voltage (MV) DC distribution
In [10], it is mentioned that the rate of deterioration is expected to be greater for voids adjacent to the electrode, as compared to those completely enclosed within the dielectric
Summary
Space limitations make direct current (DC) a favorable option, as compared to alternating current (AC), as this can lead to reduction in cable size for the same power level [1,2]. In urban areas, need for compact power redirection with emerging energy intensive distributed resources is driving the necessity of medium voltage (MV) DC distribution For these applications, an underlying assumption is that as compared to AC, a higher DC voltage can be imposed on the insulation [4,5,6]. Solid insulation systems typically consist of dielectric materials of sufficiently high breakdown strengths bridging the gap between the high and low voltage electrodes. Their function is to provide mechanical support to the electrodes while withstanding electric and thermal stresses for long durations of time, sometimes on the order of tens of years as is the case with underground cable systems. This study concentrates on voids existing at semiconducting (semicon)-dielectric interface
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