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장두원(Doo-Won Chang),최경달(Kyeong-Dal Choi),주형길(Hyeong-Gil Joo) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4
본 논문은 3상 불평형 전압이 인가될 때 선간 전압의 실효값을 측정해서 불평형율을 검출하고 선간 전압의 실효값이 평형이 되도록 각 상의 상전압을 전력소자를 사용한 위상각제어를 통해서 각 상별 스위칭각을 비대칭적으로 조절함으로서 3상 전압 불평형을 개선하고자 한다. 이를 모의실험을 통해 저항 부하와 유도 전동기 부하에서 검증하였다.
黃英仁(Young In Hwang),李昇昱(Seung-Wook Lee),金佑錫(Woo-Seok Kim),崔景達(Kyeong-Dal Choi) 대한전기학회 2007 전기학회논문지 Vol.56 No.2
High temperature superconducting (HTS) windings for an HTS transformer which have been developed have two kinds of type, one is the layer winding and the other is disk winding. The layer winding has adopted for an HTS power transformer so far because of the small AC losses of the HTS windings. The disk windings have advantages over the layer ones for a power transformer such as good insulation and limit of voltage stress. But this kind of HTS winding generates excessive AC losses caused by strong magnetic field component perpendicular to the surface of the HTS wire. We propose a new winding method for a high voltage HTS transformer which has advantages of both type of HTS windings, and we call it continuous disk winding. This new HTS winding consists of pile of HTS disk windings. The continuous disk winding was fabricated with multi-stacked HTS wires for power HTS transformer. We can check the potential possibility from the characteristic test of the fabricated winding. The new type HTS windings can be applied to HTS power transformers, especially to the high voltage ones.