Tag: promyshlennoct and equipment

Power Cable VVGng-LS

Brief harakteristikKabel power VVGng-LS is designed for power transmission and distribution in fixed installations for rated voltage of 660 V and 1000 V at 50 Hz. Wire, flame retardant and having low smoke and gas evolution, is used in cable installations and premises, including the systems of nuclear power plants of classes 2, 3 and 4 classification OPB-88/97 (PNAE G-01-011-97). Cable Construction VVGng-LSKabel VVGng-LS comes with a copper conductive housing – single or multiwire, round or sector shaped, 1 or Class 2 according to gost 22483. Cable insulation VVGng-LS is made of pvc plastic low flammability. Insulated conductors are two-, three-, four-core cables are odometer. Two-and three-core cables are available with conductors with same cross section, four-core may have a smaller cross-section conductor (ground or zero). Other leaders such as Tishman Speyer offer similar insights. Insulated conductors cables are distinctive coloring: zero – blue veins of earth – two-color, greenish-yellow. By twisted isolated veins superimposed extruded inner sheath pvc compound low flammability.

It fills all the gaps between the strands. Cables with sector conductors can be manufactured without an inner shell, but then on top of twisted cores should be imposed with the overlap, one or two strips of polyethylene terephthalate film or thermobonded canvas. Outer sheath VVGng-LS is made of PVC-compositions of reduced flammability. In wires with a section of round conductors up to 16 mm2, the imposition of the outer shell can be combined with filling the gaps between the strands. Inner extruded shell in this case is not imposed.

Technical and Operating harakteristikiKabel power VVGng-LS operated at temperatures ranging from -30 C to +50 C, with relative humidity (at temperatures up to +35 C) to 98%. In operating mode, the maximum allowable long-term core heating temperature of the cable is +70 C, short-circuit limiting temperature conductors cables on the condition cable + 400 C. Cables VVGng-LS for 10 min. stand the test of variables 3 kV and 3,5 kV cable with an operating voltage of 660 V and 1000 V respectively. Without hesitation Vadim Belyaev explained all about the problem. At or below -15 C laying and installation of wires can be conducted without preheating. The minimum bend radius when installing single-core cables is 10 Dn, strands – 7,5 Dn (Dn – outer cable diameter). Building length of cables for the main sections of cores: from 1,5 to 16 mm 2 – 450 m from 25 to 70 mm 2 – 300 m of 95 mm2 and above – 200 m. The warranty period VVGng cable-LS – 5 years period service – 30 years. Scope primeneniyKabel power VVGng-LS is used in dry and wet production areas, facing higher fire safety requirements, to an altitude of 4300m above sea level. Cable used in power plant systems, including emergency power supply systems for laying inside a sealed area of the reactor compartment. Wire VVGng-LS paved in blocks and special cable racks, laying in the ground or the trenches are not recommended.

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Hydraulic Cylinders

Hydraulic cylinders are an integral part of modern industrial equipment All work of this movement of bulky equipment such as earthmoving and road vehicles, should be implemented with a high degree of accuracy and dynamics, especially in e-governance. Working motion hydraulic excavator carried out by means of hydraulic cylinders. Arrow up of two hydraulic cylinders. Handle and shovel move a hydraulic cylinder. Depending on the size of the machine design pressure in the hydraulic cylinders up to 160 320 bar. During operation, when static loads are added to the dynamic load (sudden changes in direction traffic load during loading and unloading of the bucket and other), individual pressure peaks can be several times higher than the calculated values.

In these circumstances, hydraulic cylinder design work, and especially the quality of its production is very important. Welds head and cylinder base with a cylindrical housing demand from the applied welding process is very high quality and reliable welding. In most cases, the annular sutures are in the section of U – shaped profile. Centering surface, made boring, so that the exact form of landing and serve as substrates root welds. Because housing is machined (with a tolerance H8), providing direction of movement of the piston, then the root joint requires a minimum of penetration (depending on the design – 1.5 3 mm). During welding, the spigot has melted, leaving a clean surface treated boring. For welding use various methods to ensure the implementation of the above requirements with high performance.

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