Contens №5-2018

Analyses and forecasts

G.I. Meshchanov, Dr. Sc. (Engineering), President of Electrocable Association
Polymers in cable industry, market behavior, prospects of production development, situation with import substitution

The article is based on the report made at the 72nd general meeting of the Electrocable Association members. The author outlines the findings of the analysis of the current production, consumption and peculiarities of application of new generation polymer materials that are widely used in the cable production and are heavily reliant on import. This applies mainly to such materials as peroxide and silane cross-linkable polyolefin compounds, halogen-free compounds, and durable high density polyethylene (HDPE) sheathing compounds. The prospects of import substitution of polymers purchased abroad and the tasks facing the enterprises of the Electrocable Association are shown.
Key words
cable materials; production and consumption of polymers; cross-linkable polyolefin compounds; halogen-free compounds; PVC-compounds; sheathing polyethylene compounds.
Science and technology

A.N. Gorobets, Engineer, JSC VNIIKP;
V.L. Ovsienko, Cand. Sc. (Engineering), Head of Laboratory, JSC VNIIKP
Method of calculating the high-voltage XLPE cable conductor temperature at a given temperature of the copper screen on a real-time basis

The procedure is presented for calculation of the thermal state of XLPE-insulated high voltage cable at a given temperature of the copper screen under transient conditions of heating and cooling. The procedure is based on the finite difference method and takes into consideration the
temperature dependencies of the thermal conductivity and specific thermal capacity of insulating and semi conductive materials. The result of simulation fits well with the data of experiment, carried out with full-scale 110 kV cable sample.
Key words
high voltage cable, finite difference method, thermal conductivity differential equation, thermal conductivity and specific thermal capacity temperature dependencies.
R.I. Gazizov, graduate student of the Department of Design and Technology in Electrical Engineering;
E.V. Subbotin
, Cand. Sc. (Engineering), Assistant Professor of the Department of Design and Technology in Electrical Engineering;
A.G. Shcherbinin, Dr. Sc. (Engineering), Assistant Professor of the Department of Design and Technology in Electrical Engineering
Contact: agshch@mail.ru
Federal State-Funded Educational Institution of Higher Professional Training «Perm National Research Polytechnic University»
Calculation of spliced cable profile in a catenary vulcanization chamber

The work is devoted to optimization problem solution of passing rout of docked cables having different specific masses in the inclined type vulcanization chamber. The technique and the software, allowing to calculate the tension parameters depending on the docking point position of cables in the chamber, taking into account the given distribution of the cable axis deviation from the camera axis in the sensor were developed. The influence of the weight difference of the specific masses of docked cables and their diameters on the value of maximum deviation cables from the axis of the inclined chamber was investigated, their limiting relations were obtained. The method for optimizing the process of pulling docked cables through a vulcanization chamber, allowing to expand the range of the indicated limit relations, is proposed. The passing laws of docked cables in the vulcanization chamber are established. The regression model, allows to determine the maximum deviations of docked cables from the axis of the inclined chamber depending on the ratio of their masses and diameters, was built.
Key words
inclined type vulcanization chamber; power cable; equation of the catenary; docked cable profile; XLPE insulation.
K.A. Zvezdenkov, Cand. Sc. (Engineering), Head of Laboratory 3/2, JSC VNIIKP;
G.S. Kozlova, Cand. Sc. (Engineering), Senior Research Assistant of Laboratory 3/2, JSC VNIIKP;
I.M. Mogilny, master of RTU MIREA
Method for determination of mechanical strength of ceramic residue on samples of ceramics-forming siloxane rubber

The insulation of fire-performance cable and wire is made of ceramics-forming siloxane rubber that forms a solid residue while burning, thereby such cable and wire can function for a long time under fire conditions.
A method is proposed for determining the strength of the ceramic residue when the ceramics-forming siloxane rubber is exposed to fire. The proposed method is a complex one and estimates several indicators of the burnt rubber ceramic residue: the strength of the sample, the change in the geometric dimension and the state of the surface. This method may be used in acceptance tests of ceramics-forming siloxane rubbers. A device for determining the strength of the ceramic
layer of siloxane rubber was designed and manufactured. The developed method is issued as a standard of the organization.
Key words
rubber; ceramics-forming rubber; siloxane rubber; ceramic layer; layer strength; test method; device for determining mechanical strength; indicators of ceramic layer.
L.Yu. Kovalenko, Cand. Sc. (Chemistry), Leading Chemist, OOO «Prominvest Plastic» Company
Environmental issues associated with the use of PVC and polyolefin compounds in the cable industry

The article contains generalized information concerning the main environmental issues that arise during the manufacture of cable products. The influence of harmful factors that occur throughout the life cycle of the cable on the environmental situation is analyzed. The main ways of recycling of cable products are considered.
Key words
cables; ecology; recycling; plastic solid waste (PSW).


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