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Disruption of microbial cell within waste activated sludge is a key step to the treatment of the sludge. Pulsed electric field (PEF) has been utilized to damage the cell microstructure so as to accelerate the sludge treatment. In this paper, with the purpose of improving the cell disruption efficiency of PEF, a dc corona assisted PEF method has been proposed. Corona discharge triggered by dc voltage...
Nano-MgO particles were added in epoxy with particle weight ratios of 1, 3, 5, 7 wt%. Tracking experiments were carried out by using dc voltage. The tracking process was recorded by a high speed camera. The relation of tracking failure with the adding rate and applied voltage was investigated. Obtained results indicated that with increasing adding rate from 0 to 5 wt%, number of drops needed in tracking...
Moisture in oil-immersed transformer will become small bubbles suspending in insulation oil at high temperature. In order to investigate the influence of suspending bubbles on tracking failure of oil-impregnated pressboard in oil-paper insulation, a model based on needle-plate electrodes was established. This model was used to study effect of the number of suspending bubbles generated by dropped distilled...
Partial discharge (PD) measurement is a promising method for condition assessment of insulation systems in smart grid. Conventional PD measuring systems have some difficulties in the measurements especially under on-line and noisy conditions. There is a growing tendency to use new measuring systems for the detection of PD pulses in 10kV switchgears. In this paper, a new PD detection method based on...
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