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Now the switchgear is extensively used in the power grid. The temperature rise of switchgear issues have attracted people's great attention. The heat production and dissipation effect of the main circuit conductor is be taken into consideration comprehensively. The heat generated by the main circuitis is calculated by thermo-electricity coupled analysis. The key issue in thermal analysis of switchgear...
A novel intelligent switched capacitor AC contactor is proposed in this paper. This kind of intelligent AC contactor is developed by modifying the control circuit and the structure of a general AC contactor. It is especially designed to improve the power factor of a system through the reactive compensation of its switching capacitors. It adopts a novel approach, where the system's capacitors switch...
current and its detection in a low-voltage distribution system, an improved variable dimension progression prediction method, which is based on grey power model, is proposed in this paper. The time response function of this model is optimized as well. Moreover, the algorithm is employed to predict the actual short-circuit current on line. The simulation results indicate the feasibility and effectiveness...
An interleaved single-stage AC-DC converter is presented to reduce line current harmonics, achieve power factor correction and eliminate reactive power. An integrated buck-zeta converter is adopted to reduce the voltage stress on medium DC bus. Thus power semiconductors with low voltage stress can be used in the converter. Since buck converter is operated in the discontinuous conduction mode (DCM),...
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