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Conceptual Design of a Single Phase 33 MVA HTS Transformer with a Tertiary Winding
이승욱,김우석,한송엽,황영인,최경달,Lee, S.W.,Kim, W.S.,Hahn, S.Y.,Hwang, Y.I.,Choi, K.D. The Korean Superconductivity Society 2006 Progress in superconductivity Vol.7 No.2
We have proposed a 3 phase, 100 MVA, 154 kV class HTS transformer substituting for a 60 MVA conventional transformer. The power transformer of 154 kV class has a tertiary winding besides primary and secondary windings. So the HTS transformer should have the 3rd superconducting winding. In this paper, we designed conceptually the structure of the superconducting windings of a single phase 33 MVA transformer. The electrical characteristics of the HTS transformer such as % impedance and AC loss vary with the arrangement of the windings and gaps between windings. We analyzed the effects of the winding parameters, evaluated the cost of each design, and proposed a suitable HTS transformer model for future power distribution system.
최지훈(J.H. Choi),이승욱(S.W. Lee),박명진(M.J. Park),김우석(W.S. Kim),최경달(K.D. Choi) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
We have proposed a 100 MVA, 3 phases, 154 ㎸ class HTS transformer which will substitute for 60 MVA conventional transformer. In this paper, we designed conceptually the structure of the superconducting windings of a single phase 33 MVA transformer. The power transformer of 154 ㎸ class has a tertiary winding besides primary and secondary windings. So the HTS transformer should have the 3rd superconducting winding, it makes the cost of the HTS transformer high and the efficiency low. Further more we considered On Load Tap Changer (OLTC) in HTS power transformer. OLTC equipment is required for fitting to a power transformer by which the voltage ratio between the windings can be varied while the transformer is on load. We analyzed the electrical characteristics of the HTS transformer such as magnetic stress and AC loss.
Design of Superconducting Magnets for a 600 kJ SMES
박명진,곽상엽,이승욱,김우석,한승용,최경달,한진호,이지광,정현교,성기철,한송엽,Park, M.J.,Kwak, S.Y.,Lee, S.W.,Kim, W.S.,Hahn, S.Y.,Choi, K.D.,Han, J.H.,Lee, J.K.,Jung, H.K.,Seong, K.C.,Hahn, S.Y. The Korean Superconductivity Society 2006 Progress in superconductivity Vol.8 No.1
The design of superconducting magnets for a 600 kJ SEMS was discussed. The basic constraint conditions in the design of a 600 kJ SMES magnet were V-I loss(<1 W), inductance of magnet(<24 H), the number of Double Pancake Coils(DPC about 10), the number of turns of DPC(<300), outer diameter of DPC(close to 800 mm) and total length of HTS wire in a DPC(<500 m). As a result of optimum design, we obtained design parameters of the 600 kJ SMES magnet with two operating currents, 360 A and 370 A, which are in the limited conditions without V-I loss. V-I loss of each operating current was calculated with design parameters and V-I characteristic of the HTS wire. As a result of calculations, V-I losses with operating currents of 360 A and 370 A were 0.6 W and 1.86 W, respectively. Even though all design parameters of the SMES magnet in case of operating current of 360 A were in the restricted conditions, V-I loss of SMES magnet showed a tendency to generate at local DPCs, which are located on the top and the bottom of the SMES magnet more than that of the other DPCs.