“CABLE AND WIRES” JOURNAL - 2021 #5
Link to the number in the Scientific Electronic Library ELIBRARY.RU
SCIENCE AND TECHNOLOGY
DOI 10.52350/2072215Х_2021_5_3
V.S. Vysotsky, Dr. Sc. (Engineering), Director of Superconducting Cable and Wire Division, OJSC VNIIKP;
S.Yu. Zanegin, Senior Engineer, OJSC VNIIKP;
V.V. Zubko, Dr. Sc. (Engineering), Chief Research Scientist, OJSC VNIIKP;
A.A. Nosov, Cand. Sc. (Engineering), Senior Scientific Researcher, OJSC VNIIKP;
S.S. Fetisov, Cand. Sc. (Engineering), Deputy Division Manager for Science, Head of Laboratory, OJSC VNIIKP
Abstract. The article presents a study of the influence of the intrinsic magnetic field on the critical current, and, consequently, on the current-carrying capacity of multi-layer DC power cables based on high-temperature superconducting (HTS) tapes. An HTS cable with a four-layer current-carrying element operating at a temperature of 77 K is analyzed in detail. The critical current in each layer of the DC HTS cable is measured, calculations are performed, in which the influence of the intrinsic magnetic field on the total critical current of the cables is taken into account. The expediency of increasing the number of layers in the HTS cable in order to increase their current carrying capacity is analyzed.
Key words: DC HTS cable, cable current-carrying capacity, layers in HTS cable, magnetic field.
DOI 10.52350/2072215Х_2021_5_9
N.E. Agarova, Leading Production Engineer of the JSC “Uralelectromed” Research Centre;
N.Yu. Verkholantseva, Leading Production Engineer of the JSC “Uralelectromed” Research Centre;
A.V. Zverev, Chief Specialist of the Technical Department of the Engineering and Production Division of JSC “Uralelectromed”;
M.V. Prosvetov, Copper Rod Production Manager of JSC “Uralelectromed”;
S.E. Shikhov, Senior Technologist of JSC “Uralelectromed” Copper Rod Production;
L.M. Yakovlev, Head of Electrochemical Production Laboratory of the JSC “Uralelectromed” Research Centre
Abstract. In the presented work the influence of impurity elements in the 8-mm КМ М001 copper wire rod of JSC “Uralelectromed” on the specific electrical resistance is estimated. Using the regression analysis method with a high coefficient of determination of 0.98 the authors determined the impact on the electrical resistivity of the following elements in decreasing order: bismuth, cobalt, tin, selenium and antimony. The high purity of copper in the JSC “Uralelectromed” wire rod is shown. The range of impurities in the wire rod is very narrow, which indicates that its chemical composition is stable, the content of impurities (with the exception of specially added oxygen) is below the requirements of GOST R 53803–2010.
It was tentatively determined that in order to obtain the electrical resistivity value of less than 0.01697 Ohms×m×10-6, the chemical composition of the wire rod should contain: selenium – less than 0.27×10-4 %, tellurium – less than 0.07×10-4 %, lead – less than 0.26×10-4 %, antimony – less than 1.65×10-4 %, arsenic – less than 0.54×10-4 %, oxygen – less than 197×10-4 %. Due to the low content of impurities and stable characteristics of the JSC “Uralelectromed” wire rod, it is used for the production of cable products with increased requirements for electrical characteristics (winding wires, micron drawing, etc.).
Key words: electrical resistivity, regression analysis method, content of impurities, copper wire rod, methods of impurity analysis.
DOI 10.52350/2072215Х_2021_5_15
NEW STANDARD FOR INSTALLATION CABLES USED FOR ELECTRICAL INSTALLATIONS IN EXPLOSION HAZARD ZONES
V.V. Bychkov, Head of Industry Standardization Bureau, Ltd. NPP “Spetskabel”;
A.S. Zalogin, Cand. Sc. (Engineering), General Director of NANIO “TsSVE”;
R.G. Kuznetsov, Head of Development Department, Ltd. NPP “Spetskabel”
A.V. Lobanov, Cand. Sc. (Engineering), General Director of Ltd. NPP “Spetskabel”
Abstract. The history of development of installation cables is described, starting from their use for fixed inter-instrument installation and ending with modern automation cables designed to collect technological parameters of equipment distributed throughout the industrial production area, and feedback with actuators for the purpose of centralized production management. GOST R 59387-2021 "Installation cables for use in electrical installations in explosion hazardous zones, including for underground mines. General technical specifications" was developed, which contains requirements directly related to installation cables laid in explosive areas.
The paper presents the designs of cables that are used in production areas with hazardous zones where gaseous explosive substances, combustible dust and particles can presumably appear. The requirements are given for cables designed for connection to electrical equipment with various types of explosion protection systems, especially the explosion protection of "spark-proof electric circuit “i" type.
Key words: explosion hazard areas, explosion protection systems, spark-proof electric circuit “i”, installation cables for electrical installations in explosion hazard areas.
DOI 10.52350/2072215Х_2021_5_27
S.V. Serebryannikov, Dr. Sc. (Engineering), Professor, Head of Department of Physics and Technology of Electrical Materials and Components, MEI National Research University;
A.Z. Slavinsky, Dr. Sc. (Engineering), Head of Department of Physics and Technology of Electrical Materials and Components, MEI National Research University, Chief Executive Officer of Zavod Izolyator LLC;
A.A. Filippov, Postgraduate Student of the MEI FTEMK Department, Production Process Engineer, Ltd. “Izolyator-AKS”
Abstract. The problem of improving the dielectric strength of insulation systems always remains relevant. The increase of the dielectric strength leads to a number of benefits: reduction of the overall dimensions of the insulation system, decrease of the resources spent on the insulation production, improvement of reliability and stability in nominal or emergency operating modes. The electric insulation system made of a pair of dissimilar materials having different properties and parameters of properties and working together should be studied closely to determine the interaction of the materials in the zone of their contact. Examples of such type insulation systems: the paper-oil insulation of transformer windings or the insulation of cable current-carrying conductors, the insulation of high-voltage leads to gas insulated switchgear comprising SF6 gas and epoxy resin, as well as the reinforced insulation system of cable accessories at the point of contact with the cable insulation.
The problem of improvement of the dielectric strength of the inner surface of a high-voltage joint is under active study, which is confirmed by the number of relevant publications giving consideration to the factors that lead to a breakdown, as well as other aspects that influence the selection of materials and help to provide additional electrical protection of the zone under consideration.
The article gives a review of the cable joint design and the specific installation features that can cause an electric breakdown of the cable joint insulation. The critical zone of the high-voltage joint which is considered to be its weak point is pointed out and the ways to improve the dielectric strength of this zone are shown.
Key words: cable accessories, cable joint, dielectric strength, electric insulation, high-voltage cables, cable materials.
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