Intragranular and intergranular behaviour of multifilamentary Bi-2223/Ag tapes

Fagnard, Jean-François; Vanderbemden, Philippe; Crate, David; Misson, Vincent; Ausloos, Marcel; Cloots, Rudi

doi:10.1016/s0921-4534(02)00947-4

Cited by 5 publications

(5 citation statements)

References 16 publications

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“…Third, the magnetic induction inside the cylinder is influenced only by macroscopic circular current loops flowing in the walls of the screen, i.e. intergranular currents; this is in contrast with the magnetic moment on a plain sample which is possibly caused by intergranular as well as intragranular currents [9,10].…”

Section: Introductionmentioning

confidence: 99%

Shielding efficiency andE(J) characteristics measured on large melt cast Bi-2212 hollow cylinders in axial magnetic fields

Fagnard

Elschner

Böck

et al. 2010

Supercond. Sci. Technol.

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We show that tubes of melt cast Bi-2212 used as current leads for LTS magnets can also act as efficient magnetic shields. The magnetic screening properties under an axial DC magnetic field are characterized at several temperatures below the liquid nitrogen temperature (77 K). Two main shielding properties are studied and compared with those of Bi-2223, a material that has been considered in the past for bulk magnetic shields. The first property is related to the maximum magnetic flux density that can be screened, B lim ; it is defined as the applied magnetic flux density below which the field attenuation measured at the centre of the shield exceeds 1000. For a cylinder of Bi-2212 with a wall thickness of 5 mm and a large ratio of length over radius, B lim is evaluated to 1 T at T = 10 K. This value largely exceeds the B lim value measured at the same temperature on similar tubes of Bi-2223. The second shielding property that is characterized is the dependence of B lim with respect to variations of the sweep rate of the applied field, dB app /dt. This dependence is interpreted in terms of the power law E = E c (J/J c ) n and allows us to determine the exponent n of this E(J) characteristics for Bi-2212. The characterization of the magnetic field relaxation involves very small values of the electric field. This gives us the opportunity to experimentally determine the E(J) law in an unexplored region of small electric fields. Combining these results with transport and AC shielding measurements, we construct a piecewise E(J) law that spans over 8 orders of magnitude of the electric field.

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Section: Introductionmentioning

confidence: 99%

Shielding efficiency andE(J) characteristics measured on large melt cast Bi-2212 hollow cylinders in axial magnetic fields

Fagnard

Elschner

Böck

et al. 2010

Supercond. Sci. Technol.

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“…Regarding the imaginary , BSCCO and SCS12050 show remanent dissipation after the transition due to the eddy currents on the silver matrix and copper stabilizer [23].…”

Section: B Magnetic Measurementsmentioning

confidence: 99%

Electrical and Magnetic Characterization of BSCCO and YBCO HTS Tapes for Fault Current Limiter Application

Lamas

Baldan

Shigue

et al. 2011

IEEE Trans. Appl. Supercond.

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Several high temperature superconductor (HTS) tapes have been developed since the late eighties. Due to the new techniques applied for their production, HTS tapes are becoming feasible and practical for many applications. In this work, we present the test results of five commercial HTS tapes from the BSCCO and YBCO families (short samples of 200 mm). We have measured and analyzed their intrinsic and extrinsic properties and compared their behaviors for fault current limiter (FCL) applications. Electrical measurements were performed to determine the critical current and the value through the V-I relationship under DC and AC magnetic fields. The resistance per unit length was determined as a function of temperature. The magnetic characteristics were analyzed through susceptibility curves as a function of temperature. As transport current generates a magnetic field surrounding the HTS material, the magnetic measurements indicate the magnetic field supported by the tapes under a peak current 1.5 times higher than the critical current, . By pulsed current tests the recovery time and the energy/volume during a current fault were also analyzed. These results are in agreement with the data found in the literature giving the most appropriate performance conductor for a FCL device (I peak = 4 kA) to be used in a 220 V-60 Hz grid.

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“…Characterization of 1 cm long samples have been previously performed [7,8]. The cooling of the coil is achieved by using a cryocooler (see Sect.…”

Section: Coil Designmentioning

confidence: 99%

Use of a High-Temperature Superconducting Coil for Magnetic Energy Storage

Fagnard¹,

Crate²,

Jamoye³

et al. 2006

J. Phys.: Conf. Ser.

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Abstract. A high temperature superconducting magnetic energy storage device (SMES) has been realised using a 350 m-long BSCCO tape wound as a "pancake" coil. The coil is mounted on a cryocooler allowing temperatures down to 17.2 K to be achieved. The temperature dependence of coil electrical resistance R(T) shows a superconducting transition at T = 102.5 K. Measurements of the V(I) characteristics were performed at several temperatures between 17.2 K and 101.5 K to obtain the temperature dependence of the critical current (using a 1 µV/cm criterion). Critical currents were found to exceed 100 A for T < 30 K. An electronic DC-DC converter was built in order to control the energy flow in and out of the superconducting coil. The converter consists of a MOS transistor bridge switching at a 80 kHz frequency and controlled with standard Pulse Width Modulation (PWM) techniques. The system was tested using a 30 V squared wave power supply as bridge input voltage. The coil current, the bridge input and output voltages were recorded simultaneously. Using a 10 A setpoint current in the superconducting coil, the whole system (coil + DC-DC converter) can provide a stable output voltage showing uninterruptible power supply (UPS) capabilities over 1 s.

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Intragranular and intergranular behaviour of multifilamentary Bi-2223/Ag tapes

Cited by 5 publications

References 16 publications

Shielding efficiency andE(J) characteristics measured on large melt cast Bi-2212 hollow cylinders in axial magnetic fields

Shielding efficiency andE(J) characteristics measured on large melt cast Bi-2212 hollow cylinders in axial magnetic fields

Electrical and Magnetic Characterization of BSCCO and YBCO HTS Tapes for Fault Current Limiter Application

Use of a High-Temperature Superconducting Coil for Magnetic Energy Storage

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