Contens №4-2018

Science and technology

T.A. Stepanova, Research Scientist OJSC VNIIKP;
M.V. Syayleva, Research Scientist OJSC VNIIKP;
M.Yu. Shuvalov, Dr. Sc. (Engineering), Director of Research Area, Division Manager OJSC VNIIKP
Experimental microscopic study of rubber blends used in cable production

The authors present the results of the microscopic study of butadiene-nitrile and ethylene-vinyl acetate rubber blend carried out by means of dry and oil-immersion, high aperture dark field and anoptral microscopy at different magnifications, including immersion ones. It is shown that the blend under consideration is actually a colloidal solution but contains also relatively large fragments of a dispersion phase resolvable by a light micro-scope and resembling streaks in a glass. Differential scanning calorimetry and polarization microscopy exhibit practical absence of the crystalline phase in the blend. It is expected that the revealed heterogeneous structure will influence the characteristics of the final product. The methods used permit to select formulations with more favor-able morphology in the process of material development.
Key words
butadiene-nitrile rubber; ethylene-vinyl acetate rubber; blend; light microscopy; dark field; anoptral contrast; colloidal solution; dispersion phase.
V.V. Bychkov, Leading Specialist Ltd. NPP «Spetskabel»;
R.G. Kuznetsov, Deputy Development Department Manager Ltd. NPP «Spetskabel»;
A.V. Lobanov, Cand. Sc. (Engineering), General Director Ltd. NPP «Spetskabel»
About normalization of requirements for installation cables in the explosion safety standards

Two questions concerning the GOST IEC 60079-14 requirements are considered. The first one is about the operating voltages of spark-proof electric circuits in general and spark-proof cables in particular. The second question is about the rating of capacitance, inductance and the relationship between inductance and electrical resistance in cables for spark-proof explosion protection systems. As follows from the analysis it is necessary to develop two standards: the first one specifying the requirements to be applied in all types of explosion protection systems and intended for all types of cables installed in explosion hazard areas of all classes; the other standard of «General Technical Specifications» type shall state the requirements for the installation cables used in explosion hazard areas. It is recommended to select the wide range of СКАБ cables as basic construction for the «General Technical Specifications» standard.
Key words
explosion hazard areas; explosion protection systems; spark-proof electric circuit «i»; installation cables for explosion hazard areas.
M.S. Demin, Cand. Sc. (Physics and Mathematics), Assistant Professor;
T.F. Morozova, Cand. Sc. (Physics and Mathematics), Assistant Professor;
Northern-Caucasian Federal University, Department of Automated Electric Energy
Systems and Power Supply of Engineering Institute
About the neutral wire operation mode in distribution networks made up of 10 kv XLPE cables

Properties of cross-linked polyethylene and technology of its production are analyzed. Prospective application of treeing- resistant cross-linked polyethylene as insulating material with high performance properties is shown.
Specific aspects of XLPE cable functioning with different neutral wire operation modes are considered. Analysis of normative documentation and research papers dealing with the use of XLPE cables in medium-voltage distribution networks was performed and contradictory requirements for such cables were pointed out. Recommendations are given concerning the neutral wire operation modes when XLPE cables are used in 10 kV distribution network.
Key words
neutral wire operation modes; XLPE cables; single phase-to ground fault; silane cross-linking; peroxide cross-linking; treeing.
M.A. Boev, Dr. Sc. (Engineering), Professor National Research University
«Moscow Power Engineering Institute»;
Contact: maboev@mail.ru
Ye Naing Lin, post-graduate student National Research University
«Moscow Power Engineering Institute», FTEMK DepartmentG
Climatic and mechanical properties of drop cables

Technologies of a distribution network of optical drop cables which are designed for installation in multi dwelling units in urban areas are analyzed. OBHBLS-HF drop cables with optical micromodules and ОПЦ-Д2 drop cables with a central module used for installation with the help of the Verti Casa system offered by the Prysmian Group are considered. Mechanical tests of the cables were performed using the РРК-ЕК2 type tensile and crushing machine. Climatic tests were carried out in the Angelantoni Challenge СН1200С chamber. In the course of testing the attenuation increment dependences on the tensile and crushing strength values, as well as on the temperature, were obtained.
Key words
optical drop cable; FTTH (Fiber-To-The-Home); passive optical network; optical micromodules (OMM); talc spreader.
 Product quality control

I.B. Peshkov, Dr. Sc. (Engineering), Professor, member of Public Council at Federal Agency for Technical Regulation and Metrology;
N.V. Sakharova, General Director of Electrocable Association
Electrocable association: cable product quality assurance is one of the critical goals 

The work progress and intermediate results of the project «Risk-free cable» are shown. The positive role of the Electrocable Association cooperation with the Rosstandard, the State Committee for the Counteraction of Illegal Trafficking in Commercial Products and some of the Russian Federation regional government agencies is noted. The first results of the Moscow region pilot project for the introduction of documentary control of energy cable safety are presented. Actual examples of counterfeit products revealed in the course of this work are shown.
Key words
cable product quality; counterfeit products; compliance certificate; «Risk-free cable» project; certification agencies; testing laboratories.


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