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Zubko V.V.,Russian Scientific R and D Cable Institute VNIIKP | Fetisov S.S.,Russian Scientific R and D Cable Institute VNIIKP | Vysotsky V.S.,National Research Nuclear University MEPhI
IEEE Transactions on Applied Superconductivity | Year: 2016

The Russian Scientific R&D Cable Institute is involved in many projects on R&D high-temperature superconducting (HTS) power cables including those made of modern second generation (2G) HTS wires. Evaluation of ac losses and methods for the reduction of the ac losses are important in the design of the cables. A fine experimental technique has been developed and implemented to measure ac losses in representative cable models with a length of ∼5 m. However, only calculation can provide ac loss prediction in cases when it could be difficult to make measurements. Thus, we need a comprehensive simulation model to calculate ac losses. In HTS cables made of 2G wires, the main ac loss is a hysteresis loss, which only numerical simulation can predict for full-size 2G cables. We develop a finite-element method model to solve the electromagnetic problem for the calculation of ac losses. The model takes into account the strong nonlinear resistivity of the HTS materials, the hysteresis behavior of the magnetic substrate, the nonuniformity of critical current density across the tapes of the cable, and the possible ferromagnetism of a substrate. The model also takes into account any geometrical aspect of the 2G HTS cables. The details of the model and comparisons of calculations with our measurements of the ac losses are presented. © 2002-2011 IEEE. Source


Zubko V.V.,Russian Scientific R and D Cable Institute VNIIKP | Nosov A.A.,Russian Scientific R and D Cable Institute VNIIKP | Polyakova N.V.,Russian Scientific R and D Cable Institute VNIIKP | Fetisov S.S.,Russian Scientific R and D Cable Institute VNIIKP | Vysotsky V.V.,Russian Scientific R and D Cable Institute VNIIKP
IEEE Transactions on Applied Superconductivity | Year: 2011

2G HTS wires produced with the MOD/RABiTS process with NiW substrates have weak magnetism and therefore extra losses in a substrate. The goal of this paper is to find out the model that could describe losses just in a substrate only. Two and three dimensional numerical electromagnetic field analysis has been developed for two-layer cables made of 2G HTS conductors with magnetic substrates. Two arrangements were used for the 2G conductors between the inner and outer layers: tape-on-tape and tape-on-gap. Comparisons of calculations with measured ac loss are presented. © 2010 IEEE. Source


Fetisov S.S.,Russian Scientific R and D Cable Institute VNIIKP | Sotnikov D.V.,Russian Scientific R and D Cable Institute VNIIKP | Radchenko I.P.,Russian Scientific R and D Cable Institute VNIIKP | Vysotsky V.S.,Russian Scientific R and D Cable Institute VNIIKP | And 5 more authors.
Physics Procedia | Year: 2012

For some applications, short unit lengths of HTS wires should be spliced if longer lengths are necessary and short unit lengths of HTS wires should be utilize by applying the splice technology to reduce the total wire cost in the application. The splice technology has been developed for DI-BSCCO Type HT-CA tapes by Sumitomo Electric and spliced tapes were tested in Russian Cable Institute. The test program included: measurements of splices' resistance, critical current anisotropy, thermo cycling tolerance, mechanical properties, overload tests and magnetization measurements. In the paper the results of tests are presented and discussed. The test results demonstrated that splices can be used for cable production if twisting and bending limitations are taken into account. © 2011 Published by Elsevier B.V. Selection and/or peer-review under responsibility of the Guest Editors. Source


Fetisov S.S.,Russian Scientific R and D Cable Institute VNIIKP | Polyakova N.V.,Russian Scientific R and D Cable Institute VNIIKP | Kaverin D.S.,Russian Scientific R and D Cable Institute VNIIKP | Potanina L.V.,Russian Scientific R and D Cable Institute VNIIKP | And 3 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2014

The residual resistance ratio (RRR) is an important parameter affecting the stability of superconductors and the quench protection properties of magnets. During the manufacture and testing of cable-in-conduit-conductors, RRR may change noticeably. Recently the RRR changes of Nb3Sn strands for conductors of the ITER toroidal coils have been studied during the manufacturing process, heat treatment and SULTAN testing. Here we present the similar study of RRR of Nb-Ti strands used for conductors of the ITER poloidal coils. RRRs of the strands were measured in as-received condition and at different stages of the PF conductor manufacturing. RRR of strands extracted from ITER PF conductor sample after electromagnetic and thermal cycling in the SULTAN test facility was also measured. For this purpose the strand samples were extracted from different locations in the cross-section of the PF conductor and from different positions along the axis after testing in the SULTAN. The results about the RRR change during the manufacturing process and after the SULTAN tests and also the details of experiments are presented and discussed. © 2014 IEEE. Source

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