Kryuchkov A.A., Cand. Sc. (Chemistry), Leading Research Scientist, OJSC VNIIKP;
Savin D.V., Junior researcher, OJSC VNIIKP;
Stepanova T.A., Research Scientist, OJSC VNIIKP;
Shuvalov M.Yu., Dr. Sc. (Engineering), Research Area Director, Division Director; OJSC VNIIKP
Identification of cable polymer materials as a practical promlem
The existing market of cable polymeric materials is represented by considerable amounts of similar products, which however differ in details of formulation. In some cases these peculiarities may have negative influence on cable quality and reliability. Therefore, the identification of cable compounds becomes important scientific and practical problem. The cooperation of test labs, material and cable manufacturers will promote its successful solution.
The examples of identification of different complexity are described, the following methods are used: thermal analysis, FTIR spectrometry, IR and light microscopy, liquid chromatography, cone-calorimetry. It is shown that obtaining the trustworthy result requires the application of several methods in parallel in order to overcome the possible limitations of each separate method.
identification; cable polymer compound; thermal analysis; infrared spectrometry; high performance liquid chromatography; microscopyn.
Gecha E.Ya., Dr. Sc. (Engineering), Chief Research Scientist, OJSC VNIIKP;
Gordienko V.N., Dr. Sc. (Engineering), Chief Research Scientist, OJSC VNIIKP;
Ovchinnikova I.A., Cand. Sc. (Engineering), Research Area Director, OJSC VNIIKP
Methodological aspects of measuring mechanical characteristics of cable construction polymer elements
The article deals with the methods of mechanical testing of cylindrical construction polymer elements.
Cylindrical polymer elements, more specifically cable construction elements, made by extrusion methods, are transversely isotropic.
Special equipment and methods were developed to determine their mechanical characteristics in the isotropy plane – the −E-2 modulus of elasticity during compression and the E2 modulus during bending.
Special equipment and methods were developed to test cable elements and specimens for simultaneous exposure to tensile strain, hydrostatic pressure and torsional force.
Experimental testing of mechanical performance of optical cable elements and specimens was carried out according to the developed methods.
The error of the formulas in these methods does not exceed 10 %.
cable constructions; polymer elements; mechanical tests; modulus of elasticity; secant modulus; anisotropy; tensile strain; hydrostatic pressure; torsional forces.
Vetlugaev S.S., Cand. Sc. (Engineering), Research Scientist, OJSC VNIIKP;
Makarov L.E., Cand. Sc. (Engineering), Head of Laboratory, OJSC VNIIKP;
Turkina N.I., Leading Engineer, OJSC VNIIKP;
Priority goals for improving power cable accessories up to 35kV. Standartization issues
Priority directions for the revision of state standard GOST 13781.0–86 «Accessories for power cables up to and including 35 kV» are considered. The requirements set by international and domestic standards for cable accessories that are not specified in this state standard are indicated.
The new kind of cable accessories is mentioned: detached plug-and-socket split-type connectors that are now widely used in power grids.
Reasons are given for the necessity of developing a new standard based on the domestic GOST and international standard IEC 60502-4.
power cable accessories; GOST 13781.0–86; IEC 60502-4; angled right angle connectors; T-type connectors; thermal shrinkage technology; tracking and erosion resistancee.