Contens №3-2017

Science and Technology

M.L. Strupinsky, Cand. Sc. (Engineering), General Director of the “Special systems and technologies” group of companies
Contact: sst@sst.ru
Self-regulating cables of domestic manufacture are the key element of electrical heating systems in the oil and gas complex

The paper shows the importance of work aimed at creating electrical heating systems based on self-regulating heating cables and provides the work principle and the cable designs. These systems are of critical importance for the Russian oil and gas complex facilities and are used at hydrocarbon production, transportation, storage and processing stages. A number of electrical heating systems created by the “Special systems and technologies” group of companies and built at the major oil and gas complex facilities are presented.
Key words
“SST” group of companies; electrical heating; heating cables; self-regulating cables;  conducting plastics; skin heaters; trace heating; process heating; import substitution; non-resource exports; national champions.
V.V. Zubko, Cand, Sc. (Physics and Mathematics), Leading Research Scientist; 
G.G. Svalov, Dr. Sc. (Engineering), Chief Research Scientist; 
S.S. Fetisov, Cand. Sc. (Engineering), Deputy Division Manager, Head of Laboratory;
Optimization of power cable designs based on high-temperature superconducting wires

Uniform current distribution over both the current-carrying element and the screen layers is one of the main tasks in the designing of an optimized coaxial HTSC cable. In JSC VNIIKP mathematical models were developed for the calculation of optimized pitches and directions of round superconductor twisting or application of flat superconductors in the cable multilayer current-carrying element and screen. The first model is based on the solution of combined equations for the cable electric circuit by the finite difference method (FDM); two other models are based on the use of the finite element method (FEM) simulating the cable current-carrying element and screen structure. The suggested mathematical models were evaluated while the prototype of a compact second generation high-temperature superconducting power cable (HTSC-2) was fabricated. The optimization of superconducting cables with reduced diameters becomes more complicated and requires higher accuracy.
The cable prototype test results were used to develop approaches and solutions for the assurance of higher accuracy in the HTSC-based cable optimization.
Key words
HTSC cables; high-temperature superconductor; design optimization; current distribution; layers.
Yu.I. Borisova, Engineer-Programmer of ZAO “Moscow technical bureau”; 
E.Ya. Gecha, Dr. Sc. (Engineering), General Director of ZAO “Moscow technical bureau”; 
Contact: egecha@mtb91.ru
Ya.Z. Mesenzhnik, Dr. Sc. (Engineering), Chief Research Scientist of JSC VNIIKP;
A.O. Novik, Cand, Sc. (Physics and Mathematics), Assistant Professor of NIU MEI;

About the basics of the cable twisting theory. Classical (spiral) twisting

Parametric equations were derived for the form of the spiral element (SE) section in the plane perpendicular to the core axis over the full range of the SE twist angles. These equations were used to develop a formula for the calculation of the number of SEs that can be placed in the construction with the given parameters (core diameter, SE diameter and twist pitch), as well as the peripheral gap between them.   
For some typical cable twist constructions a nomogram and a table are presented, they allow to determine for a certain number of SEs with a given diameter the core diameter around which these elements are supposed to be twisted with a given pitch without peripheral gap between them, as well as the diameter of additional (filling) construction elements over the full range of the twist pitches (angles) permissible for this construction.
Key words: twisting parameters; spiral element; core; parametric equations; peripheral gap; section form.
M.A. Boev , Dr.Sc. (Engineering), Professor National Research University (MEI);
Yekyaw Min , post-graduate; National Research University (MEI);

Resistance of buied optical cables to mechanical stress (spiral) twisting

The paper presents present-day designs of ОГЦ-8А-7, ОГЦ-16А-7, ОГЦ-24А-7, ОГЦ-4А-20, ОГЦ-12А-20 optical cables intended for direct burial. The cables are manufactured in accordance with technical specifications (TU 3587-001-58743450-2005). The results of experimental investigation of these cables for admissible tensile stress and elongation are given.
Key worlds. optical cable; optical fiber; attenuation; tensile stress; elongation.


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