• Title/Summary/Keyword: Pancake

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Test of a High Temperature Superconducting Power Transformer (고온초전도변압기 특성시험)

  • Lee, H.J.;Cha, G.S.;Kim, W.S.;Han, S.Y.;Ryu, K.W.;Choi, K.D.
    • Proceedings of the KIEE Conference
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    • 1999.11b
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    • pp.33-35
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    • 1999
  • This paper describes the test results of the single phase 3kVA high temperature superconducting power trans-former. The tapes are made with Bi-2223 and have silver alloy as the matrix. Four double pancake windings are used in total. Among them two double pancake windings are connected in series for high voltage winding and two double pancake windings are connected in parallel for low voltage winding. The rated voltages of each winding are 220/110 V. Fundamental characteristics are obtained through short circuit and no load tests. The over load capability and characteristics are investigated.

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Simulation of Quench in Pancake-shaped Superconducting Magnet Using a Quasi-three-dimensional Model

  • Wang, Qiuliang;Yoon, Cheon-Seog;Kim, Kee-Man
    • Progress in Superconductivity
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    • v.1 no.2
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    • pp.125-134
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    • 2000
  • A quench phenomenon is caused by an external disturbance in a superconducting magnet, where the magnet is operating in a cryogenic environment. The heat coupling between the layers and pancakes of the magnet can induce the normal zone propagation with fast speed. In order to analyze quench behavior in a pancake-shaped superconducting magnet, a quasi-three-dimensional model is proposed. A moving mesh finite volume method is employed in solving the heat conduction equation. The quench process of the superconducting magnet is studied under the various operating conditions and cooling conditions.

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Optimal Design and fabrication of Prototype DC Reactor for Inductive Superconducting fault Current Limiter (유도형 고온초전도 한류기용 Prototype 직류 리액터의 설계와 제작)

  • 김태중;강형구;고태국
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.16 no.12S
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    • pp.1292-1298
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    • 2003
  • In this paper, dc reactor lot the inductive high-Tc superconducting fault current limiter (SFCL) was optimally designed by finite element method(FEM). The Prototype high-Tc do reactor was manufactured and compared to the results of design. This dc reactor consists of 4∼stacked double pancake coils which are wounded with Bi-2223 wire coated with SUS315L. Kapton tape is used for the insulation of turn to turn and layer to layer. Each pancake is connected in series by soldering Finally, optimal design and manufacture method lot the dc reactor is suggested in this paper. Through the comparison of result of optimal design and experimental result of prototype high-Tc superconducting dc reactor, reliance on the design of the high-Tc dc reactor tot the 1.2 kV/80 A SFCL is proved.

Properties of a HTS magnet consisting of pancake windings by using the E-J method

  • Kim, Young-Min;Kang, Myung-Hun;Paik, Kyoung-Ho;Cha, Guee-Soo;Jeon, Chang-Wan
    • Progress in Superconductivity and Cryogenics
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    • v.13 no.4
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    • pp.26-29
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    • 2011
  • In a High temperature superconducting (HTS) tape with high aspect ratio, the magnetic field applied to the HTS tape can be different considerably within the HTS tape. The current distribution in the HTS tape is generally non-uniform because the current distribution is strongly dependent on the applied magnetic field. Non-uniform current distribution in a HTS tape has not been properly considered when the critical current has been estimated. This paper shows the calculation of critical current of a HTS magnet consisting of pancake windings. Non-uniform distribution of current in the HTS tape is considered during the calculation of the critical current. Results of calculation show the current concentrated in the middle part of the HTS tape which is used for one pancake winding.

The Characteristics Analysis of a HTS Transformer (고온초전도변압기의 특성해석)

  • Lee, Hui-Jun;Cha, Gwi-Su;Lee, Yong-Uk;Han, Song-Yeop
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.49 no.1
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    • pp.27-31
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    • 2000
  • This paper presents the performance evaluation of an HTS transformer. Numerical calculation by finite element method was used to evaluate the performance. BSCCO-2223 HTS tapes and double pancake winding were adopted in this design. Four double pancake windings were used in total. Among them two windings were connected in series for high voltage winding and two windings are connected in parallel for low voltage winding. Propertied of various type of the winding arrangement were examined. Characteristics of the transformer during the transient which was caused by sudden short were simulated. The current limiting effect, temperature rise and resistance growth of the superconducting winding were shown.

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Optimizing Recipes of Mung Bean Pancake for Teenagers

  • Lee, Jin-Wha;Shin, Eun-Soo;Ryu, Hong-Soo
    • Preventive Nutrition and Food Science
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    • v.15 no.4
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    • pp.340-347
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    • 2010
  • To standardize the recipes for healthy fast food market potentiality, a sensory acceptability analysis, instrumental texture analysis and nutritional evaluation were performed on Korean style mung bean pancake (MPC) and modified MPC containing squid meat and soybean. Optimal ingredient formulation was revealed to be 34% mung bean, 49% pork and 17% vegetables for traditional MPC, and 21% pork, 66% squid meat and 13% soybean for modified MPC, using response surface methodology. Flavor and hardness correlated highly with overall acceptability, rather than appearance and color of traditional MPC. Higher squid levels raised adhesiveness, springiness and resilience of modified MPC, but the higher soybean levels decreased these textural attributes. Protein, lipid and total calories of modified MPC were lower than those of traditional MPC. Degree of gelatinization of modified MPC was superior to traditional MPC.

AC Losses of the Multi-stacked HTS tapes and Pancake Coil (고온초전도 적층선재의 손실과 적층선재로 제작한 팬케이크 권선의 손실)

  • Lee Seung-Wook;Kim Yong-Sub;Lee Hee-Joon;Cha Gueesoo;Lee Ji-Kwang
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.776-778
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    • 2004
  • In this paper, we present effect of the stacked HTS tapes. AC losses of HTS pancake windings with stacked tapes are shown. Magnetic flux density in the HTS winding under operating conditions was calculated by FEM. AC loss of the pancake winding were measured and compared with the calculated loss by using AC losses of the stacked samples. Test results show that measured results generally agreed well with the calculated value by using AC loss of 4-stacked sample data.

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Stability Against Heat Pulse for Bi-2223 HTS Pancake Coils with Different Ag/SC Ratio (은비가 다른 Bi-2223 고온초전도 팬케이크 코일의 히트펄스에 대하 안정성)

  • 장현만;오상수;하홍수;하동우;류강식;김상현
    • Progress in Superconductivity and Cryogenics
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    • v.1 no.2
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    • pp.43-48
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    • 1999
  • The normal zone propagation (NZP) velocity and V-I characteristics of two Bi-2223 pancake coils with different Ag/SC ratio were investigated based on the experimental results and broad resistive transition were obesved in two coils. The measured NZP velocity of coil was found to be faster due to increase of Ag/SC ratio, and agree well with calculated data from two dimensional heat balance equation.

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Quench Properties of Bi-2223 Pancake Coils with Different Ag/SC Ratio (은비가 다른 Bi-2223 팬케이크 코일의 ?치 특성)

  • 장현만;오상수;하홍수;하동우;장국렬;류강식;김상현
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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    • 1999.02a
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    • pp.109-112
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    • 1999
  • The normal zone propagation (NZP) velocity and V-I characteristics of two Bi-2223 pancake coils with different Ag/SC ratio were investigated by experiment. Non-uniformity of Ic and broad restive transition was oberserbed in two coils. The NZP velocity of azimuth direction is faster than radius direction, and the NZP velocity of coil with higher Ag/SC ratio is faster than another coil with lower Ag/SC ratio.

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AC Losses of the HTS Double Pancake Winding (고온초전도 더블 팬케이크 권선에서 발생하는 교류손실 측정)

  • 이승욱;이희준;임형우;차귀수;이지광
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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    • 2003.02a
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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.

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