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In this paper the inrush current due to an arbitrary excitation of a three phase transformer after a fault is modeled in time domain. The approach proposed, although using several simplifying assumptions, seems promising in order to calculate the optimal time to close the circuit after a fault when solid state switching are used. This technique may be useful for many applications, among them the switching...
During the last decade, insulated-gate bipolar transistorbased electronic devices have increasingly been adopted to control the power supply of drives associated with Type I randomwound rotating machines, and new reliability problems have surfaced [1]. Pulse width modulator drives that are associated with these machines produce voltage waveforms having fast rise time fronts, and overvoltages at the...
This paper shows that power efficiency in the power supply with PFC is improved drastically by using the new FRD with high avalanche capability. Firstly the new FRD is applied to the output rectifier of 3 kW output power in order to reduce the loss of it. High frequency switching loss decreases because the new FRD has faster trr. Secondly, we apply the new FRD to the PFC circuit. In the PFC circuit,...
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