A flux pump is a kind of power source that energizes superconducting magnets usually embedded in the cryogenic system. Therefore, heat loss through current leads eliminated, allowing for more efficient cooling design. winding technique, so-called "wind-and-flip," had been proposed by authors to realize jointless HTS coil perfect resistanceless closed loop, which may enable induce persistent an wound with second-generation tape. In this paper, we investigated charging/discharging...

Development of a 600 kJ Superconducting Magnetic Energy Storage (SMES) system is in progress by Korean Electric Research Institute (KERI). High-temperature superconducting (HTS) wires are going to be used for the winding system. The design HTS windings presented this paper. We considered BSCCO-2223 wire windings. operating temperature was decided 20 K which will accomplished conduction cooling method using cryo-coolers. Auto-Tuning Niching Genetic Algorithm adopted an optimization magnets...

Conductor on round core (CORC) is one of high temperature superconducting (HTS) conductors with large current capacity. CORC stacks HTS tapes to increase the can have various structures according how we stack tapes. The direction spiral winding in each layer and overlapped area affect AC losses because mainly depend perpendicular magnetic fields We measured magnetization short samples structures. Each sample has a different number layers, layer, area. confirmed best structure least loss.

High Temperature Superconducting (HTS) cables for large current capacity are being studied in several forms power device applications. Currently, the developed DC applications rather than AC However, if a technology reducing loss is developed, it will be possible to apply HTS various devices. Twisted Stacked-Tape Cable (TSTC) one of cables. It made by stacking and twisting multiple tapes capacity. The TSTC should twisted uniformity distribution each tape. Since tape has wide thin film shape,...

Twisted stacked-tape cable (TSTC) is one of the high temperature superconducting (HTS) conductors with a large current capacity. These HTS cables for currents need their strands to be transposed even distribution. The strands, stacked tapes, in TSTC can by twist. Moreover, twist also decouple filaments an strand when tape striated. We made short samples striated or non-striated tapes verify effect magnetization loss reduction. were 4 mm that did not have copper stabilizers. In this paper,...

A 600 kJ HTS SMES system has been developed for power stabilization as a national project in Korea. Successful operating tests of the were recently completed. In this paper, 2.5 MJ class with magnets single solenoid, multiple solenoid and modular toroid type optimized using multi-modal optimization technique named multi-grouped particle swarm (MGPSO). The objective was to minimize total length superconductor wires satisfying some equality inequality constraints. stored energy constraints...

A 2.5 MJ Superconducting Magnetic Energy Storage System (SMES) is being developed as a national R&D project in Korea. It 2nd phase of total 3 phases program. In 1, we 600 kJ SMES which had the maximum storage over 1 MJ. Its magnet was an HTS solenoid, whereas for 2 toroid composed 28 double pancake coils. The final target to develop 5 SMES, will start from next year. operating temperature be below 20 K by conduction cooling. this paper, present and compare conceptual designs shape...

It has been well known that a coated conductor (CC), 2G superconducting tape, shows higher critical current and better performance than the 1G, BSCCO one. However, there still no way to make joint with CC, so it almost impossible build CC magnet in persistent mode. As viable solution for this, we have proposed special winding technology called Wind-and-Flip method. new possibility generation of mode CC. First, partially cut wide tape into two pieces along except at both end parts like...

The high temperature superconducting (HTS) conductors for electrical power devices and machines should have large current capacity low AC loss. Conductors on round core (CORC) is one of the promising that characteristics. It consists helically wound HTS tapes copper. We simulated a striated tape CORC with multiple in parallel. Two width 6 mm emulated 12 striation three 4 two striations, so on. performance depends diameter former pitch helical winding. First, we investigated characteristics...

A 1 MVA single phase high temperature superconducting (HTS) transformer was manufactured and tested. The rated voltage of primary secondary HTS are 22.9 kV 6.6 respectively. BSCCO-2223 tape used for windings transformer. In order to reduce AC loss generated in the winding, concentrically arranged winding adopted Single 4 parallel tapes were considering each current core fabricated as a shell type made laminated silicon steel plate. And GFRP cryostat with room bore also manufactured....

A SMES magnet can be operating in three different modes: charging, storing, and discharging. The eddy current losses magnetization are generated during charging discharging the system. per cycle mainly period because is generally shorter that for charging. Magnetization In this paper, we investigated a decrease according to shapes of conduction cooling plates. plate having small was designed by dividing slitting. Also, toroidal coil constructed with many pancake coils were analyzed using 3-D...

A 600 kJ superconducting magnetic energy storage system (SMES) project with high temperature superconductor (HTS) started as a national in Korea. The HTS model coils were designed and fabricated for preliminary test prior to the creation of full scale prototype. Single reinforced BSCCO-2223 wires used operating was decided be 20 K. Even though an SMES is not AC-powered device, time-varying currents during charging discharging periods lead generation time-variation fields applied AC loss. In...

A large bore double pancake coil(DPC) was designed and tested with 2G HTS wire to develop the conduction cooled superconducting magnet central field intensity of 3 T at 20 K operating temperature clear 100 mm room temperature. The effect insulation between turns coils tested. Two without turn were wound using 4 wide conductor. temporary result suggests that coil electrical can be protected from higher over current shows improved stability.

We had proposed a winding method, the so-called "wind-and-flip," which enables persistent current-mode operation of high-temperature superconducting (HTS) pancake coil. Two coils been fabricated using this method and tested in liquid nitrogen bath with an external magnetic field. The result showed that time stability was not good enough to use for resonance imaging or nuclear when they were magnetized by field cooling at 77 K. In paper, test results stacked HTS coil center 1 T are presented....

We fabricated superconducting magnet using second-generation (2G) high-temperature wire by SuNAM. Magnetic field strength at the center is 4 T, and room temperature bore diameter 203 mm. The consists of 30 double pancake coils (DPCs) with inner 245 mm outer 297 All pancakes were wound no-insulation method performance tested separately before assemble. Tested DPCs resistively connected HTS tape(splice joint), assembled coil was conduction cooled a two-stage Gifford-McMahon cryo-cooler to...

Superconducting magnetic energy storage (SMES) systems with High Temperature (HTS) wires have been actively developed world-wide. A 600 kJ class SMES Bi-2223 HTS wire has in development as a national project since 2004 and is currently approaching the final testing stage of first three phases. In second phase project, several MJ will be developed. this paper, designs magnets for 5 DI-BSSCO YBCO coated conductor are presented compared.

HTS transformers which have been developed until now had only fundamental structures. Among the auxiliary functions of conventional transformers, voltage regulating is most important one. For regulation, are equipped with on load tap changers (OLTCs). In this paper, we investigate possibility transformer OLTC. case study, designed a single phase 33 MVA It one three individual composes 3 phase, 100 transformer. expected to substitute for 60 in Korea. The parameters an varied due gap length...

It is well known that HTS (high temperature superconductor) promising for magnet applications, but it has been almost impossible so far to apply them magnets in persistent current mode because of poor qualities their superconducting joints at higher as lower index values. To get rid the non-superconducting from an magnet, a wind-and-flip technique demonstrating operation using YBCO coated conductors had suggested. This paper presents experimental results measured drift pancake coil which was...

A 100 MVA, commercial class high temperature superconducting (HTS) transformer was designed. In this paper the cryogenic system to extract heat generated at winding due AC loss and penetration through wall current lead keep under design is presented. The operation set 67 K increase critical reduce amount of HTS tape usage volume. concentrically arranged loss. consists main cryostat with windings secondary cooler, cryopump exchanger inside. liquid nitrogen entering 65 assumed be leaving K....

Recently, it is proposed to make striations on the YBCO coated conductor and transpose each other as one of solutions decrease perpendicular magnetization loss. For large power application using HTS, stacked packing conductors should be used because current carrying capacity a single limited. The has different AC loss characteristics from screening currents in adjacent affect local magnetic field at position conductors. In this paper, we research effect by stack, striation transposition...

A 2.5 MJ HTS superconducting magnetic energy storage (SMES) system is under development to compensate the sag or instantaneous black out for a utility side. The toroidal-type structure adapted reduce perpendicular field and stray at outside of SMES. magnet shows small field. However, parallel much larger than one. Therefore, Lorentz force tape can be so strong stress analysis should carried verify that maximum hoop normal are in appropriate range. In addition, overall inward an pancake...

This paper describes the electrical analysis and performance test result of windings a 10 HP homopolar fully superconducting synchronous motor. The motor has high temperature (HTS) armature field coils. stationary coils make cooling system simple easy because there is no cryo-moving part. design magnetization loss generated in are performed by finite element method. critical current results 2G wire, pancake coil for winding race track reported.

A 2.5 MJ HTS SMES is being developed as a national program in Korea. This paper presents design results of modular magnets for the toroidal SMES. We considered choice BSCCO-2223 or ReBCO tapes conductors Operating temperature was decided to be 20 K which could accomplished by conduction cooling with couple GM cryo-coolers. Key factors may include minimization total conductor requirement and low AC loss.