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Summary In this paper, the authors propose a new method for identification of magnetizing inrush current phenomena. In general, the identification is performed using the current waveform. However, saturation of current transformers makes it impossible to obtain such a waveform. Therefore, the authors introduce an identification method using the voltage waveform, in which the transformer saturation voltage does not occur. By applying Aitken's Δ2 process, it is shown that the new identification method gives accurate saturation start and end times.

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In this paper, we propose a new type of phase converter that has a new configuration with a core, shading ring, a single-phase ac winding and two output windings. The induced voltages in the output windings are proportional to the fluxes that link the windings and are similar in principle to those of in a transformer. But the phase angle between the induced voltages is not equal as the flux that l i n h each output winding is not equal due to a shading effect which makes the lag. By setting the proper shading ring, 2-phase and 3-phase output voltages are obtained from the single-phase source. This new type of converter makes the induced voltages with good sine waveform because it does not contain switching elements and is not based on ferro-resonance. Experimental results show the effectiveness of the proposed structure.