Search results for: L. M. Fisher

Items from 1 to 11 out of 11 results

article

A Superconducting Fault Current Limiter with a Power of 16 MV A

L. M. Fisher, D. F. Alferov, A. I. Budovskiy, I. F. Voloshin, more

Russian Electrical Engineering > 2019 > 90 > 2 > 125-129

The results of tests of a short-circuit resistive switching superconducting fault current limiter (SFCL) for dc mains with maximum voltage of 4.1 kV and rated current of 4 kA have been considered. The superconducting unit and automatic high-speed vacuum breaker are key components of the SFCL. The superconducting unit consists of eight series-parallel connected modules, each of which contains four...

article

Effect of the Rate of the Rise in Current on Transient Processes in a Superconducting Fault Current Limiter

D. F. Alferov, M. R. Akhmetgareev, D. V. Evsin, I. F. Voloshin, more

Technical Physics > 2018 > 63 > 1 > 26-31

The effect of the rate of the rise in the current to 1700 A/ms on the characteristics of a transition of units of superconducting (HTSC) modules from a superconducting to normal state has been experimentally studied. The units differed by the critical current of the HTSC tape and design. The units of HTSC modules are used as a part of the resistive superconducting fault current limiter (SFCL) for...

article

A superconducting direct-current limiter with a power of up to 8 MVA

L. M. Fisher, D. F. Alferov, M. R. Akhmetgareev, A. I. Budovskii, more

Physics of Atomic Nuclei > 2016 > 79 > 14 > 1577-1584

A resistive switching superconducting fault current limiter (SFCL) for DC networks with a nominal voltage of 3.5 kV and a nominal current of 2 kA was developed, produced, and tested. The SFCL has two main units—an assembly of superconducting modules and a high-speed vacuum circuit breaker. The assembly of superconducting modules consists of nine (3 × 3) parallel–series connected modules. Each module...

article

Superconducting fault current limiter for railway transport

L. M. Fisher, D. F. Alferov, M. R. Akhmetgareev, A. I. Budovskii, more

Physics of Atomic Nuclei > 2015 > 78 > 14 > 1654-1657

A resistive switching superconducting fault current limiter (SFCL) for DC networks with voltage of 3.5 kV and nominal current of 2 kA is developed. The SFCL consists of two series-connected units: block of superconducting modules and high-speed vacuum breaker with total disconnection time not more than 8 ms. The results of laboratory tests of superconducting SFCL modules in current limiting mode are...

article

Multigap superconductivity in doped p-type cuprates

Ya. G. Ponomarev, V. A. Alyoshin, E. V. Antipov, T. E. Oskina, more

JETP Letters > 2014 > 100 > 2 > 126-132

Andreev and tunneling spectroscopy studies of Bi₂Sr₂Ca_{n − 1}Cu_nO_{2n + 4 + δ}, HgBa₂Ca_{n − 1}Cu_nO_{2n + 2 + δ} and Tl₂Ba₂Ca_{n − 1}Cu_{2n + 4 + δ} have shown that superconductivity in single-layer (n = 1) and two-layer (n = 2) phases has a single-gap character. Qualitatively different results were obtained for three-layer...

article

AC Magnetization Loss of a YBCO Coated Conductor Measured Using Three Different Techniques

M Majoros, M D Sumption, M A Susner, E W Collings, more

IEEE Transactions on Applied Superconductivity > 2011 > 21 > 3-3 > 3293 - 3296

In-field ac losses were measured on a 2 G YBCO tape by three different methods; these consisted of an M(H) loop (inductive) based method as well as two different calibration-free approaches. For the M(H) loop-based method the sample was placed inside a pick-up coil connected in series with, and in opposition to, a compensation coil. The voltage developed in series across these two coils was directly...

article

Phase diagram and isotope effect in cobaltites with spin-state transitions

N. A. Babushkina, A. N. Taldenkov, A. V. Kalinov, L. M. Fisher, more

Bulletin of the Russian Academy of Sciences: Physics > 2010 > 74 > 10 > 1345-1347

The oxygen isotope effect was investigated in cobalt oxides (Pr_{1 − y}Eu_y)_0.7Ca_0.3CoO₃ (0.12 < y < 0.26). The measurements of magnetization, electric resistivity, differential magnetic susceptibility, thermal expansion, and specific heat show that as the Eu concentration increases, a transition from “ferromagnetic metal” to “weakly magnetic insulator” is observed at y ≈ 0.18. In the insulating...

article

Peculiarities of magnetic field-induced ferromagnetic ordering in narrow-band manganites

I. F. Voloshin, A. V. Kalinov, L. M. Fisher, N. A. Babushkina

Bulletin of the Russian Academy of Sciences: Physics > 2007 > 71 > 5 > 605-607

The temperature dependences of the residual magnetization in narrow-band manganites (Pr_0.67Ca_0.33MnO₃, Sm_0.55Sr_0.45Mn¹⁸O₃, Sm_0.55Sr_0.45Mn¹⁶O₃, and (NdEu)_0.55Sr_0.45Mn¹⁸O₃) have been studied. All compounds studied are characterized by a fairly high residual magnetization M _R (about 0.5 μ_B/Mn) at 4.2 K, which vanishes upon sample heating to the temperature T _RE ≈ 30–35 K, which is much lower than...

article

Anisotropy of magnetic properties of Sm_0.55Sr_0.45MnO₃ single crystals

I. F. Voloshin, A. V. Kalinov, L. M. Fisher

Bulletin of the Russian Academy of Sciences: Physics > 2007 > 71 > 5 > 670-672

Anisotropy of the magnetic properties of Sm_0.55Sr_0.45MnO₃ single crystals has been studied. A significant increase in the antiferromagnetic component of magnetization in the case of orientation of an external magnetic field H close to the c axis has been found. Magnetization for a field lying in the ab plane seems typical of a ferromagnet. Anisotropy of susceptibility reaches 2.2 in weak fields and...

article

Correlation between phase diagrams and spontaneous magnetization jumps in narrow-band manganites

I. F. Voloshin, A. V. Kalinov, L. M. Fisher, N. A. Babushkina, more

Bulletin of the Russian Academy of Sciences: Physics > 2007 > 71 > 8 > 1061-1062

The correlation between the phase diagrams of narrow-band manganites and the abrupt magnetization jumps observed previously at a magnetic-field-induced transition from the antiferromagnetic to ferromagnetic state has been studied. This transition occurs during several milliseconds and is related to a spontaneous thermal avalanche; however, the mechanisms of the avalanche formation and development...

article

Contactless method for measuring the parameters of the current-voltage characteristic of YBCO superconductors in a perpendicular magnetic field

I. F. Voloshin, A. V. Kalinov, L. M. Fisher, M. L. Nesterov, more

Bulletin of the Russian Academy of Sciences: Physics > 2007 > 71 > 8 > 1098-1100

A contactless method for determination of the parameters of the current-voltage (I—V) characteristic of hard superconductors by measuring the magnetization relaxation of the superconductor in a perpendicular magnetic field has been developed. The relaxation curves obtained for melt-textured YBCO samples are well approximated by the curves calculated within the electrodynamic model based on power-law...

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