“CABLE AND WIRES” JOURNAL - 2020 #2
Link to the number in the Scientific Electronic Library ELIBRARY.RU
SCIENCE AND TECHNOLOGY
EVALUATION OF THE DIELECTRIC STRENGTH OF FIRE-PERFORMANCE CABLE PROTOTYPES. THE FIRST RESULTS
D.A. Bulychev, Group Leader, JSC VNIIKP;
D.A. Guk, Head of High-Voltage Test Center of JSC VNIIKP;
M.K. Kamensky, Cand. Sc. (Engineering), Deputy Division Manager, JSC VNIIKP;
V.G. Meshchanov, Deputy General Director – Director for Development and Foreign Economic Activities of JSC VNIIKP;
M.Yu. Shuvalov, Dr. Sc. (Engineering), Director for Research Area – Division Manager, JSC VNIIKP
Abstract. The fire-resistant power cable models were manufactured, containing two overlapping mica tapes of type A or type B and extruded fire-retardant PVC or silane-crosslinked polyethylene insulation. Models were subjected to the following tests:
– determination of short-term dielectric strength at 780 0C by means of application of 1 kV during 1 hour with the subsequent voltage increase at a rate of 150 V/min;
– measurement of electrical «life curve» (for models with crosslinked polyethylene insulation only). Both tests exhibited higher dielectric strength of models containing A-type mica tapes.
Key words: fire resistant cable, model, mica tape, high temperature, dielectric strength, «life curve».
OPTIMIZATION OF MULTILAYER HIGH TEMPERATURE SUPERCONDUCTING CABLES FOR DEMAGNETIZATION SYSTEMS
V.S. Vysotsky, Dr. Sc. (Engineering), Director for Research Area – Division Manager, JSC VNIIKP;
S.Yu. Zanegin, Senior Engineer, JSC VNIIKP;
V.V. Zubko, Dr. Sc. (Engineering), Leading Research Scientist, JSC VNIIKP;
L.V. Potanina, Cand. Sc. (Engineering), Leading Research Scientist, JSC VNIIKP;
S.S. Fetisov, Cand. Sc. (Engineering), Deputy Division Manager, Head of Laboratory, JSC VNIIKP
Abstract. The creation of a high-temperature superconducting (HTSC) demagnetization system allows the significant weight savings compared to conventional demagnetization systems based on copper coils. The dominant costs in HTSC systems are the cost of HTSC materials. Since the cable of the demagnetization system works with a slowly changing field and optimization is not required to reduce losses on alternating current, to increase its operating current, you can use the longitudinal magnetic field effect, due to which the current of the HTSC tape in a magnetic field parallel to the current can significantly increase. We carried out optimization of HTSC cables for system windings taking into account the effect of a longitudinal magnetic field. It is shown that this will lead to an additional decrease in the mass of the superconductor. To check the estimates of the mass of the HTSC demagnetization windings, this paper presents the created and tested model of the demagnetization system for small objects.
Key words: HTSC cable, demagnetization, longitudinal magnetic field.
LIFETIME OF OPTICAL CABLES. ANALYSIS. RISKS
A.Yu. Tsym, Head of Laboratory of FGUP TSNIIS, Dr. Sc. (Engineering), Senior Research Scientist, Professor of “Future-Proof Telecommunication Technologies and Services” Department of MTUSI, Honorary Worker of the RF Communication Industry
Abstract. The traditional indicators (gamma-percent and assigned service life) and criteria (physical and moral wear) of cable durability are considered. A new criterion of durability for optical fiber cables (OC) of the Russian information infrastructure has been introduced - the disproportionate risk of loss of network connectivity. The critical importance of setting parameters of the ultimate state of OC in the normative legal documentation is shown. Theoretical models of the “aging” of optical fibers and cables are presented. Measures to ensure the durability of OC are proposed and a conclusion is drawn on the need to audit OC during operation.
Key words: optical fiber, optical fiber cable, lifetime, limit state, communication network, failure rate, audit.
The article is devoted to the memory of Yu.T. Larin.
I.V. Anishchenko, Engineer of the National Research Nuclear University MEPhI (Moscow Engineering Physics Institute);
A.A. Kartamyshev, Senior Research Scientist the National Research Center “Kurchatov Institute”;
M.A. Osipov, Engineer of the National Research Nuclear University MEPhI (Moscow Engineering Physics Institute);
I.A. Rudnev, Cand. Sc. (Physics and Mathematics), Professor of the National Research Nuclear University MEPhI (Moscow Engineering Physics Institute);
D.S. Yashkin, Research Engineer of the National Research Center “Kurchatov Institute”
Abstract. The processes of SuperOx second generation high temperature superconducting tapes (2G HTS) transition from the superconducting state to the normal state under the exposure to magnetic field pulses of about 80 msec duration were investigated. During the test a transport current of 81–89 A, close in value to the tape critical current Ic = 83 А, was applied to the superconducting tape at a temperature of 77 K.
Then the HTSC tape was subjected to magnetic field pulses of various amplitudes from 0.25 TL to 1.75 TL with a duration of 80 msec. The influence of the initial transport current value and the amplitude of the applied magnetic field on the HTSC tape transition to the normal state and back to the initial superconducting state was studied. The transition process modelling demonstrated a close agreement of the test data and the calculation results. The obtained data make it possible to solve problems related to the development of high-speed switching devices based on high temperature superconducting tapes designed for operation in superconducting energy storage devices, energy distribution and transmission systems, current limiters and new types of modern transportation.
Key words: high temperature superconductors (HTSC-conductors); HTSC tapes; magnetic field pulses; transition to the normal stateе.
INDUSTRY NEWS
I.B. Peshkov, Dr. Sc. (Engineering), Professor, Honorary President of the Electrocable Association
CONTROL AND SORTING OF PLASTIC PELLETS AS A GUARANTY OF FINAL PRODUCT QUALITY
Hilger Groß, Business Development & Sales Manager SIKORA AG;
Rebecca Zachau, Corporate Communications SIKORA AG
JUBILEES
THE MOSCOW POWER ENGINEERING INSTITUTE CELEBRATES ITS 90-th ANNIVERSARY
S.V. Serebryannikov, Dr. Sc. (Engineering), Professor, Head of “Physics and Technology of Electrical Materials and Components” Department of NIU “Moscow Power Engineering Institute”, RF Electrical Engineering Academy
