“CABLE AND WIRES” JOURNAL - 2022 #1
Link to the number in the Scientific Electronic Library ELIBRARY.RU
HIGHLIGHTS OF THE GREAT MAN'S LIFE
SCIENCE AND TECHNOLOGY
DOI 10.52350/2072215Х_2022_1_9
D.A. Guk, Head of High-Voltage Test Center, OJSC VNIIKP;
A.A. Kryuchkov, Cand. Sc. (Chemistry), Leading Research Scientist, OJSC VNIIKP;
V.L. Ovsienko, Cand. Sc. (Engineering), Head of Laboratory, OJSC VNIIKP;
T.A. Stepanova, Research Scientist, OJSC VNIIKP;
M.Yu. Shuvalov, Dr. Sc. (Engineering), Director of Research Area – Division Manager, OJSC VNIIKP
Abstract. The comparative data previously obtained by the authors for the properties of medium-voltage (MV) cable insulations based on ethylene-propylene rubber (EPR) and cross-linked polyethylene (XLPE) are briefly summarized.
The results of the long-term electrochemical and thermal ageing tests of EPR and XLPE insulated cables are given; it is shown that the XLPE insulation possesses higher residual dielectric strength in both cases.
The second part of this article is focused on the study of three polypropylene-based insulating materials in comparison with the water tree retardant XLPE. The aim of the study is to evaluate the basic properties of the PP insulation in a virgin state, as well as its resistance to electrochemical and thermal ageing. It is shown that the initial values of the PP electrical and mechanical properties are at a high level. However, the PP-compounds are more susceptible to thermal ageing than the XLPE materials. On the whole the tested PP materials also exhibit satisfactory resistance to water treeing, being slightly inferior to XLPE. It is stated that the potential place of the medium-voltage PP insulating systems in the Russian market can be evaluated only after full-scale long-term cable tests for resistance to different forms of ageing are carried out.
Key words: ethylene propylene rubber, water tree retardant cross-linked polyethylene, polypropylene, test, electrochemical ageing, thermal ageing
DOI 10.52350/2072215Х_2022_1_21
A.A. Kryuchkov, Cand. Sc. (Chemistry), Leading Research Scientist, OJSC VNIIKP;
T.A. Stepanova, Research Scientist, OJSC VNIIKP;
M.Yu. Shuvalov, Dr. Sc. (Engineering), Director of Research Area – Division Manager, OJSC VNIIKP
Abstract. The case of abnormally fast oxidation of signal cable polyethylene (PE) insulation during its thermal ageing test is considered. According to the authors’ opinion the presence of small amount of polypropylene (PP) in the material is responsible for this phenomenon – PP initiates and accelerates the PE oxidation. DSC and micro-FTIR have been used as analytical methods. The initial stage of the fast oxidation is localized in the polymer volume. The visually observed areas of highly oxidized PE have dimensions starting from tens of microns.
Key words: polyethylene, polypropylene, oxidation, Differential Scanning Calorimetry, Fourier Transfer Infrared Microspectroscopy
DOI 10.52350/2072215Х_2022_1_27
D.A. Tarasov, Head of Optical Fibre Cable Department, OJSC VNIIKP
Abstract. The drawing tower operating regimes are determined for the application of a double-layer primary protective coating from the developed compositions based on UV-curable acrylates, namely: the speed of extraction, the power of UV lamps and the volume of nitrogen supply to them.
Key words: optical fibers, primary coatings, optical fiber drawing, UV-curing
INDUSTRY NEWS
SOME ISSUES OF OPTICAL FIBRE CABLE PRODUCTION TECHNOLOGY IMPROVEMENTS
I.B. Peshkov, Dr. Sc. (Engineering), Professor, Chief Research Scientist, OJSC VNIIKP
INNOVATION MATERIALS FOR THE CABLE INDUSTRY
I.B. Peshkov, Dr. Sc. (Engineering), Professor, Chief Research Scientist, OJSC VNIIKP
GENERAL MEETING OF THE ACADEMY OF ELECTROTECHNICAL SCIENCES OF THE RF
JUBILEES
E.B. Vasiliev celebrated his 70th birthday
OBITUARY
