Contens №1-2019
Science and Technology

V.S. Vysotsky, Dr. Sc. (Engineering), Superconducting Cable and Wire Division Director, OJSC VNIIKP;
S.Yu. Zanegin, Senior Engineer, OJSC VNIIKP;
V.V. Zubko, Dr. Sc. (Engineering), Leading research Scientist, OJSC VNIIKP;
Potanina L.V., Cand. Sc. (Engineering), Leading research Scientist, OJSC VNIIKP;
S.S. Fetisov, Cand. Sc. (Engineering), Deputy Division Manager for Science — Head of Laboratory, OJSC VNIIKP
Use of high temperature superconductors for the demagnetization of large masses

Using of high temperature superconducting (HTS) cables, cooled to cryogen temperatures in advanced demagnetization systems is absolutely natural. This is because superconductors are able to work at much higher current density than conventional conductors. They are better adapted to work at quasi-constant currents that is usually used in demagnetization systems. The advantages of HTS cables are reduced losses, considerably smaller sizes and mass of cables. Nevertheless, HTS cables are demanding extra auxiliary equipment (cryostats, cryocoolers). In the paper presented we evaluated advantages in using HTS cables for demagnetization of large ferromagnetic masses.
Key words
HTS cable; HTS winding; demagnetizations; deperming.
Il’in A.A., Leading Specialist;
Kovalev I.A., Cand. Sc. (Engineering), Head of Laboratory;
Kruglov S.L., Dr. Sc. (Engineering), Leading Research Scientist;
Polyakov A.V., Leading Specialist;
Shutova D.I., Cand. Sc. (Physics and Mathematics), Research Scientist;
Shcherbakov V.I., Senior Specialist;
National Research Center «Kurchatov Institute»
Dinamic modes of HTS based current-carrying elements

Second generation (2G) high temperature superconductors (HTS) are used in AC superconducting cables, current leads for charged particle accelerators, inductive energy storage systems, windings of motors and generators, etc.
High-current superconducting devices require the development of multi-tape current-carrying elements (CCE) on the basis of HTS. Recently HTS REBCO stacks, soft-soldered along the entire length for thermal and mechanical stability, have become widespread. The study of the performance of such CCEs under dynamic modes and the determination of their limit operating parameters is an important practical task.
The authors experimentally investigated specimens of HTS conductors made of up to 5 REBCO tapes produced by SuperPower and SuperOx in liquid nitrogen at extremely high ramp rates. A new specimen charging technique was developed. The acceptable current and magnetic field ramp rates were determined. A high thermal stability for REBCO conductors in liquid nitrogen was experimentally confirmed at ramp rates up to 320 kA/s. The experimental results are compared with the operational dynamic mode of HTS current leads for the Russian NICA accelerator complex.
Key words
AC superconducting cables; current-carrying elements; superconductors; second generation high temperature superconductors; high temperature superconducting tapes; REBCO tapes.
Kryuchkov A.A., Cand. Sc. (Chemistry), Leading Research Scientist, OJSC VNIIKP;
Stepanova T.A., Research Scientist, OJSC VNIIKP
Application of chromatographic methods for the determination of the activation energy of thermal aging of cable PVC compounds

The paper describes the determination of the apparent activation energy of thermal aging (W) of PVC compounds containing a mixture of dioctyl phthalate and diisononyl phthalate as plasticizers using the liquid and gas chromatography methods. The data obtained by these methods agree with each other, as well as with the results of the long-term thermal aging of similar PVC compounds and with the results of the tests using the thermogravimetric analysis method. The authors propose to use the generalized data to verify the accuracy of the results of determination of W PVC compounds.
Key words
PVC compound; activation energy; liquid chromatography; inverse gas chromatography of polymers; thermogravimetric analysis.

Grin’ A.V., Leading Design Engineer,  Estralin PS Ltd.;
Mneka A.S., Technical Director, Estralin PS Ltd.
Fastening of 110-500 kV XLPE-insulated cables when laid in air

Regulations specifying the fastening of 110-500 kV cables during installations, which were in effect earlier in the USSR and are still effective in Russia, make no allowance for the peculiarities of 110-500 kV XLPE-insulated cables when laid in air.
The article describes modern methods of fastening of 110-500 kV XLPE-insulated cables when laid in air, including the methods used when the space between the attachment points is increased and the cables are laid with bending («serpentine»). Examples of cable location and fastening on 110-500 kV cable lines installed in Russia and abroad are shown.
Key words
110-500 kV cable lines; XLPE-insulated cables; fastening of 110-500 kV cables laid in air; 110-500 kV cable installation.


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