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Traditional cable insulation status diagnosis method is comprised of withstand voltage experiment. However, withstand voltage experiment injures the insulation part. Insulation resistance and tanδ provide the limited information because of single frequency test. However polarization and depolarization(PDC) can be used for determining the ageing extent of the cables. Existing equipments have...
Dielectric response(DR) measurement has been deployed as a non-destructive and potential diagnostic method for moisture or aging condition of power system apparatuses. In order to promote the application of DR method, development of precise, easy-to-use and cost-effective testing devices is an urgent issue, in which accurate acquisition of the insulation current is critical. In this paper, a DR testing...
With the increasing consumption of power cable in urban areas, its ampacity becomes a hot research spot. At present, lots of researches about ampacity and temperature field concentrate on one single-core cable. However, pluralities of cables are laid intensively in duct banks for a real power system. Compared to single cable, if several cables are running at the same time, those cables' temperature...
Prior to flasshover across solid dielectrics under steady-state high voltage excitation in vacuum, there are charging phenomena occurring on insulator surface, which significantly affect the developing process of flashover. In this paper, based on the secondary electron emission avalanche model (SEEA) and Monte Carlo simulation method, the theoretical analysis of surface charge density on insulation...
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