One of the important challenges facing the country's power is the solution to the problem of power supply reliability. Power cables that were previously used for laying nets designed to medium, low and high stress, in many cases obsolete. Today, the domestic industry unable to meet the growing demand for power cables of the new generation – an opportunity to buy a cable with improved features directly from the manufacturers. The modern cable production offers consumers the power cables of three types: paper-insulated lead-in shell, with xlpe insulation (Polyolefin) and conventional, insulated by a thermoplastic polyethylene. If we evaluate the advantages and disadvantages of each type of power cables, it turns out next. An important advantage of cable with paper impregnated insulation designed for low and medium voltage (this brand of asb, sb, sg, tsasb, cbs and others) – stable electrical characteristics.
However, the disadvantages are the laborious process of manufacture, expensive and, besides, the heavy metallic shell of this type of power cable. Sales of cable insulated with a thermoplastic polyethylene is becoming larger scale, however, and this kind of power cable (it's brand vvg, avvg, VBbSh, AVBbSh, kvvg and others) can not be called universal, although the cost of such cables are more than acceptable. Power cable with plastic insulation has very low resistance to high temperatures, comparable to the melting point of polyethylene. The most up to date power cable suitable for use in both low and high voltage, as well as withstand severe thermal stress, is a cable with xlpe insulation. High mechanical strength, power cable (it's brand ABvBbSh, AnBn, PVBbSh, PvVG and others) due to "cross-linking" of polyethylene. "Matching" means processing of isolation at the molecular level – resulting in a three-dimensional structure of the insulation material with exceptional properties.
Power cables with xlpe insulation have a working temperature range when operating in emergency mode, more than similar options paper insulated cables with an average of 30%, and the cable from an ordinary polyethylene – by 60%. In addition, "stitched" negigrosokopichny cables and have high strength characteristics. These properties are given to these power cables by using a process of "matching" silanes – grafted organo-functional groups. For power cables, designed for medium voltage is applied another way of stitching – peroxide, in a dry environment. This is necessary in order to ensure the immutable physical and mechanical properties of the cable in the transverse direction and to achieve stable electrical characteristics.