• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제4B권2호
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• pp.54-58
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• 2004

This paper presents the iron core design method of a high temperature superconducting (HTS) transformer considering voltages per turn (V/T). In this research, solenoid type HTS coils were selected for low voltage (LV) winding and double pancake coils for high voltage (HV) winding, just as in conventional large power transformers. V/T is one of the most fundamental elements used in designing transformers, as it decides the core cross sectional area and the number of primary and secondary winding turns. By controlling the V/T, the core dimension and core loss can be changed diversely. The leakage flux is another serious consideration in core design. The magnetic field perpendicular to the HTS wire causes its critical current to fall rapidly as the magnitude of the field increases slowly. Therefore in the design of iron core as well as superconducting windings, contemplation of leakage flux should be preceded. In this paper, the relationship between the V/T and core loss was observed and also, through computational calculations, the leakage magnetic fields perpendicular to the windings were found and their critical current decrement effects were considered in relation to the core design. The ％ impedance was calculated by way of the numerical method. Finally, various models were suggested.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 B
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• pp.723-724
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• 2006

In this study, superconducting coil arrangements and cryostat concept design were conducted for the development of 13.2kV/630A bifilar winding type high temperature superconducting(HTS) fault current limiter(FCL) with YBCO coated conductor(CC) wire. The coil consists of several layers with unique non-inductive solenoid winding method. Six types of HTS coil arrangements were investigated for the optimal insulation design of HTS FCL. And, conceptual design of cryostat was conducted for the decrement of thermal invasion and the prevention of low voltage insulation breakdown in the LHe which is used as pressurization gas in sub-cooling condition of liquid nitrogen(LN2). As the results, it was found that the modified suspended type cryostat with horizontal coil arrangement is beneficial to the insulation design of 13.2kV level bifilar winding type HTS FCL.

• 한국초전도ㆍ저온공학회논문지
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• 제15권1호
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• pp.35-39
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• 2013

The superconducting Homopolar motor is manufactured and tested. Homopolar motor system is simple and solid as the field coil of the motor is fixed near the stator coil without rotating system. In this paper, a 5 kW fully superconducting homopolar motor which has high temperature superconducting armature and field coils is manufactured and tested in liquid nitrogen. The critical current test results of the used 2G superconducting wire, pancake coil for rotor winding and race-track coils for armature winding are reported. Also, the test result of rotating and operating performance is presented. The operating frequency is to be 5 Hz for low-speed rotating. The developed fully superconducting Homopolar motor is the world's first.

• 한국초전도저온공학회:학술대회논문집
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• 한국초전도저온공학회 2003년도 추계학술대회 논문집
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• pp.230-233
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• 2003

This paper deals with the fabrication of high temperature superconducting(HTS) solenoid for DC reactor of 6.6㎸/200A inductive superconducting fault current limiter(SFCL). The winding machine which is suitable to wind HTS wire was manufactured. The proper inductance was calculated by circuit simulation and G10-FRP bobbin was fabricated with this inductance, HTS solenoid was wound by using the winding machine. The V-I characteristic of completed DC reactor in sub-cooled nitrogen(65K) was measured. The full quench current of this magnet is about 490A.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 B
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• pp.1133-1135
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• 2004

Superconducting transmission power cable is one of interesting parts in power application using high temperature superconducting wire. One of important parameters in high-temperature superconducting (HTSC) cable design is transport current distribution because it is related with current transmission capacity and ac loss. In this paper, the transport current and magnetic field distributions at conducting layers were investigated through the analysis of the equivalent circuit for HTSC power cable with shield layer. The transport current distribution due to the pitch length and winding direction was improved in case of HTSC power cable with shield layer.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 B
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• pp.720-722
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• 2001

The high temperature superconductor transformer gains interests from the industries. This paper examined characteristics of the laboratory scale three phase HTS transformer and Brandt equation is used to calculate the loss by perpendicular magnetic field in transformer winding. To estimate the performance of the three phase HTS transformer no load characteristics, short circuit characteristics are calculated by using finite element method. Transient characteristics of sudden short circuit during full load operation have been examined. Effect of the resistance growth in the HTS wire from the quench of the wire is included in the calculation.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1994년도 추계학술대회 논문집
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• pp.175-178
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• 1994

In this study, the design program for optimal wire batch around service line is made to improve the dielectric strength at the primary winding using Finite Element Method. The automatic convergence algorithm for finding of limit object value using loop circulation method is developed to make the optimal design simulator The modulation method is suggested to make division time faster which is very important for full program efficiency. As a result, the program execution time is reduced about 32% and the optimal wire batch design is obtained.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2005년도 춘계학술대회 논문집
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• pp.119-122
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• 2005

In this study, the design simulation for optimal wire batch around service line was made to improve the dielectric strength at the primary winding using Finite Element Method. The automatic convergence algorithm for finding of limit object value using loop circulation method was developed to make the optimal design simulator. The modulation method was suggested to make division time faster which was very important for full simulation efficiency. As a result, the simulation time was reduced and the optimal wire batch design was obtained.

• 한국초전도저온공학회:학술대회논문집
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• 한국초전도저온공학회 1999년도 제1회 학술대회논문집(KIASC 1st conference 99)
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• pp.134-137
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• 1999

This paper describes the design, code of a $\mu$SMES device that we developed. The 0.7MJ $\mu$SMES coil was wound with high winding tension of about 14kbf/$mm^{2}$ in order to prevent wire motion from Lorentz force. This coil was charged up to a current of 1820A with a ramping rate of about 10A/s, where a quench occurred. This quench current is sbout 82% fo the coil critical current.

• 한국초전도저온공학회:학술대회논문집
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• 한국초전도저온공학회 2003년도 학술대회 논문집
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• pp.246-249
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• 2003

AC loss which is generated in an HTS wire varies with the direction of the magnetic field. This paper calculated and measured the AC loss in the HTS double pancake windings. Brandt equation is used to calculate the loss by perpendicular magnetic field. Calorimetric method is used to measure the AC loss. Results of calculated AC loss are compared with measured AC loss.