RU25636U1 - POWER CABLE WITH POLYVINYL CHLORIDE INSULATION - Google Patents

Description

1. Description of utility model

1.1.Name utility model

Power cable with PVC insulation 1.2 The technical field to which the utility model belongs.

Power cables with polyvinyl chloride insulation are intended for power supply of industrial installations, connection of household and similar devices in stationary conditions to an electric network with a rated alternating voltage up to 0.66 kV with a frequency of 50 Hz.

Cables are intended for operation in a stationary state at an ambient temperature from plus 50 С to minus 30 С, relative air humidity up to 98% at a temperature up to 35 С.

1.3 prior art.

Information about analogues taken from the reference book "Electric wires and cord), authors N.I. Belorussov, A.E. Sahakyan, A.I. Yakovleva, publishing house "Energy, g. Moscow, 1979, also used information from the official publication “Power cables with plastic insulation. Technical conditions, IPK Publishing House of Standards, Moscow, 1999.

The closest in essential features analogue of the power cable with polyvinyl chloride insulation power cable brands VVG, VVGz.

Power cable with copper conductors, with polyvinyl chloride insulation, in a polyvinyl chloride sheath. The purpose is the same as that of the claimed utility model, namely: transmission and distribution of electrical energy in stationary installations at a rated alternating voltage of 0.66 kV.

Power cable design elements: conductive conductors, core insulation, sheath.

Signs of an analogue that coincide with the essential features of a power cable with polyvinyl chloride insulation:

- copper or aluminum conductors, number from 1 to 5

-nominal section of the main copper conductors at a rated voltage: 0.66 kV - 1.5 -: - 50 sq. mm .;

veins are round, single and multi-wire;

-insulation of PVC compound;

- the insulated conductors of the VVGz cable are twisted and between the conductors are filled with PVC compound or unvulcanized rubber compound:

-the cable is made without winding with polyethylene terephthalate tapes, provided that the insulated cores are mobile and the shell can be separated from the insulation without damage;

- insulation resistance of cables with polyvinyl chloride insulation for a voltage of 0.66 and 1 kV at 20 s for at least 5x1000000 Ohm x km;

the cable is laid with a bend radius; for single-core cables not less than 10 D, for multi-core cables - 7.5 D, where D is the outer diameter; long-term permissible temperature for heating the cable conductors must not exceed 70 C, the maximum allowable temperature of the cable conductors with PVC insulation with a short circuit of 150 ° C .;

on the cable sheath, no more than every 300 mm, a distinctive sign of the manufacturer is applied, year of manufacture. Service life 30 years, warranty service life 5 years

1.4. The essence of a useful model

The development of a power cable with polyvinyl chloride insulation for indoor installation (connecting household appliances and similar applications in stationary conditions to an electrical network with a rated alternating voltage of up to 0.66 kV at a frequency of 50 Hz) allows for more accurate, without damaging the insulation, cable cutting during installation, increases cable flexibility, increases fire resistance.

This technical result is achieved by extrusion of the belt insulation from unvulcanized finely filled rubber mixture based on ethylene propylene rubber with a polymer content of 8-30% by weight of the mixture. An essential feature of the utility model is belt isolation.

Belt insulation made from a finely filled rubber compound provides certain advantages that are not available to peers using conventional filling: the convenience of cutting the cable during installation for connection, reducing the time and complexity of installation, and increasing fire safety.

1.5. The list of figures of drawings and other materials.

The drawings show:

figure 1. - power cable diagram with PVC insulation for stationary laying at a voltage of 0.66 kV with three single-wire conductors with a cross section of 10 square meters. mm, brand NUM

1.6 Information confirming the feasibility of the utility model.

Description of the design of the utility model - power cable with polyvinyl chloride

insulation:

Copper (Fig. 1, pos. 2). Cores, consisting of wires (Fig. 1, pos. 1). The number of cores varies from 1 to 5, cross-section from 1.5 to 35 square meters. mm Conductors with a section of up to 10 square meters. mm inclusive must be single-wire, with a cross section of more than 10 square meters. mm. - 7-wire sealed. The shape of the conductive veins is circular. The cores do not have any burrs, cutting edges, bulging or breaks in individual wires that could damage the insulation. Serve to direct the flow of electrical energy.

grounding conductors must be two-color (green-yellow), with one of the colors covering at least 30 and not more than 70% of the insulation surface, and the other the rest. Color coding should be solid or in the form of a longitudinal strip with a width of at least 1 mm. Single conductor insulation must be black or green / yellow.

- Insulated conductors must be twisted. In five-core cables, insulated conductors must be twisted around the core of polyvinyl chloride plastic compound.

In multicore cables. 11th, belt insulation must be applied over twisted insulated cores (Fig. 1. Pos. 4). Belt insulation should be extruded from unvulcanized finely filled rubber compound with filling the gaps between the cores. When applying belt insulation by pressing, the mobility of insulated cores must be preserved, and the possibility of separation without damage to the insulation of cores from zone insulation.

- A sheath of polyvinyl chloride plastic compound is applied over the waist insulation (Fig. 1, item 5). The shell should be light gray. On the surface of the insulation and the shell there should not be any cracks, bubbles and dents that deduce the thickness of the insulation and the shell beyond the maximum deviations.

The way to use the utility model.

Power cables with PVC insulation are used for the installation of electrical wiring and cable lines (open and hidden) in industrial, residential and public buildings and structures, as well as in cable structures to ensure the safe operation of electrical equipment of protection class 1 electrical safety.

Power cables can be laid in the building structures of buildings and structures, in dry, wet and high-grade rooms inside and outside of brick and concrete walls, with the exception of direct incorporation into raw concrete. Outdoor use is only possible when protected from direct exposure to sunlight.

Cables are not intended for installation in the ground. Laying can be carried out in pipes, in closed installation and closed channels.

Power cable with polyvinyl chloride insulation is connected to devices, devices. Under the action of the supplied voltage, an electric current arises, which, distributed throughout the entire cross section of the conductive core (Fig. 1 pos. 2), is transmitted from the source to the consumer. PVC insulation (fig. 1, pos. 3) creates a geometrically stable insulation gap, which protects the cores from a short circuit in the circuit, and also, for safety reasons, from electric shock.

Description of structural elements due to which it becomes possible to expand the assortment of power cables and obtain a technical result - cutting the cable with a mount without damaging the insulation.

A structural element that allows you to achieve the desired technical result: belt insulation.

The expansion of the arsenal of power cables and the ability to carry out cable installation with maximum convenience and without damage to the roll is achieved by using a finely filled rubber mixture based on ethylene propylene rubber with a polymer content of 8-30% for belt insulation.

This rubber compound is a composition consisting of rubber and various ingredients.

The basis of the rubber compound is ethylene propylene rubber (SKEP), which is the product of the copolymerization of ethylene with propylene. Its content in the mixture is 8-30%.

The other components of the mixture, giving it certain technological and operational properties, are: fillers - chalk and talc, softeners paraffin, dibutyl phthalate, stearic acid.

When applied to the cable, the rubber compound does not cure, i.e. does not go from plastic to elastic state. Due to this, the rubber compound can be easily removed during cutting without damaging the insulation.

Thanks to the developed power cable with a belt insulation made of unvulcanized melon-filled rubber mixture based on ethylene propylene rubber with a polymer content of 8-30% by weight of the mixture, it is possible to significantly simplify the installation process and avoid damage to the insulation when cutting the cable.

application

Table 1-1

With green and yellow residential ground

Number of cores

green yellow / black / blue

green yellow / black / blue /

brown

green yellow / black / blue /

brown / black

O ff off

- Table 1-2

Without green and yellow

ground conductors

Black / blue

Black / blue / brown

Black / Blue / Brown /

the black

Black / Blue / Brown /

black / black

Claims (1)

Power cable with polyvinyl chloride insulation for stationary laying at a voltage of 0.66 kV, with copper conductors, with belt insulation made of rubber compound, with polyvinyl chloride sheath, characterized in that the belt insulation is extruded from unvulcanized finely filled rubber mixture based on ethylene propylene rubber with a polymer content of 8 -30% by weight of the mixture.