Contents №6-2016
Science and Technology

M.B. Alekseev, Head of Laboratory, OAO “VNIINM”; 
S.Yu. Zanegin, Senior Engineer; 
V.V. Zubko, Cand. Sc. (Physics and Mathematics), Leading Research Scientist; 
D.S. Kaverin, Cand. Sc. (Engineering), Senior Researcher; 
A.A. Nosov, Senior Engineer;
L.V. Potanina, Cand. Sc. (Engineering), Leading Research Scientist; 
G.G. Svalov, Dr. Sc. (Engineering), Chief Research Scientist; 
S.S. Fetisov, Cand. Sc. (Engineering), Deputy Division Manager – Head of Laboratory;
Investigation of relative residual resistance of niobium-stannum wires as part of “cable-in-conduit” conductors

An experimental investigation was carried out to study the relative residual resistance (RRR) of niobium-stannum (Nb3Sn) superconductors being part of “cable-in-conduit” after annealing and subsequent exposure to controlled bending strain. A statistical analysis of the experimental data was performed. It was shown that the use of the “annealing-coiling” method, when the diffusion heat treatment is carried out before the cable is put into the conduit, ensures a sufficient level of RRR of Nb3Sn conductors provided that the conductor during coiling is bent at a radius more than 3 m.
Key words
Superconducting wire; Nb3Sn; superconducting cable; RRR; LTS.
V.V. Zubko, Cand. Sc. (Physics and Mathematics), Leading Research Scientist, JSC VNIIKP
Calculation model for current redistribution and heating of HTSC power cable elements under short-circuit conditions
Most electrical devices must be designed so that they remain in their operation condition after a short circuit during which currents, sometimes ten times higher than rated values, flow along them for some short period of time. Therefore the designing of power cables based on high temperature superconductors involved the investigation of their behavior under short-circuit conditions. The paper presents a model used to calculate the redistribution of currents between metal and superconducting elements of HTSC cables and heating of HTSC cables under short-circuit conditions. The results of calculated behavior of VNIIKP-designed HTSC cables under short-circuit conditions are given.
Key words
HTSC cable; high temperature superconductor; short circuit; temperature.
V.M. Barinov, Associate Professor of Petersburg Power Engineering Institute of Professional Development; 
A.V. Pronin, Deputy Chief of Cable Line Services; 
N.N. Solovyov, Deputy Director – Technical Director; 
PAO “Lenenergo”, branch of “Cable network”
Incoming quality control of cable products 
The authors describe the long-term experience of “Cable network” PAO “Lenenergo” specialists related to the incoming quality control of cable products. This measure contributes to the improvement of operational reliability of power grids. 
Key words
Gutta-percha insulation; incoming quality control; terminations and joints; manufacturing defects; preventive electric testing; acceptance tests; silane cross-linking; peroxide cross-linking; high dc voltage test; high ac low frequency voltage test.
A.L. Zubilevich, Cand. Sc. (Engineering), Professor of “Guiding Telecommunication Environment” Department;
S.A. Sidnev, Cand. Sc. (Engineering), Associated Professor of Management Department;
V.A. Tsarenko, post-graduate of Management Department;
Moscow Technical University of Communications and Informatics
 Contact: zal51@rambler.ru
Revisiting the issue of the choice of the installation method for underground optical cables

The paper continues the series of publications [1, 8] devoted to the choice of the installation technology for underground optical cables. Just as in the indicated papers, two technologies are compared – installation of an armored optical cable directly into the ground and of a reduced-weight cable into a special protective polymer conduit. The authors attempt to assess quantitatively the potentials for the further development of communication networks. This goal is achieved with the use of the real options method.
Key words
Optical cable installation technology; fiber optic communication lines; protective polymer conduit; net present value; real options.
M.A. Boev, Dr. Sc. (Engineering), Professor National Research University (MEI);
Contact: maboev@mail.ru
Zin Min Latt, post-graduate National Research University (MEI)
Optical fiber signal strength attenuation under the exposure of in-plant optical cables to a crushing force
The paper presents the crushing test results of ОВНСLS-HF, ОВНРLS-HF, ОВНВLS-HF in-plant optical cables used by providers for interior communication links. The cables are manufactured in accordance with the specification requirements. The test was carried out using the РРК-ЕК2 stretching and crushing unit. The test with loads less than 500 N was performed on the Hounsfield H5KS tensile test machine. The optical fiber signal strength was measured using the ОТ-2-6 optical tester; the attenuation increment was calculated versus the value of the crushing force applied to the cable.
Key words
optical cable; optical fiber; attenuation measurement; signal strength; attenuation increment; crushing force.


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