RU87558U1 - 6 KV POWER CABLE WITH IMPROVED FIRE SAFETY INDICATORS - Google Patents

Abstract

1. Power cable with conductive copper or aluminum single or multi-wire cores, insulated with polyvinyl chloride plastic compound, twisted into a core, with an inner sheath (belt insulation) extruded from polyvinyl chloride plastic compound, with an electrically conductive screen made of conductive paper tapes and a metal screen over which with overlapping tape of polyethylene terephthalate (polyvinyl chloride) film and a sheath of polyvinyl chloride plastic compound, characterized in that the insulation is conductive yaschih conductors, the inner and outer shell are made of polyvinyl chloride compositions, low flammability. ! 2. The power cable according to claim 1, characterized in that on top of the twisted insulated conductors, a fastening winding of refractory polymer (fibrous) material is superimposed with overlapping, while filling the space between the insulated conductors is made of bundles of a low fire hazard polyvinyl chloride composition. ! 3. The power cable according to claim 1 or 2, characterized in that on top of the metal screen by the method of winding, a separating layer of tapes of a nonflammable non-woven fabric is applied.

Description

The utility model relates to the cable industry, namely, to the design of a power cable designed for transmission and distribution of electrical energy in installations for a rated alternating voltage of 6 kV with a frequency of 50 Hz.

An analogue of the development is a power cable with plastic insulation for a rated alternating voltage of 6 kV at a frequency of 50 Hz, containing conductive metal cores insulated with a polymeric material; belt insulation of insulation material or PVC compound is applied over twisted insulated cores by extrusion; an electrically conductive screen is pressed over the waist insulation, extruded from an electrically conductive material or superimposed by winding from a tape of conductive rubberized fabric or two tapes of conductive cable paper; a metal screen is superimposed on top of the conductive screen; tapes made of polyethylene terephthalate or polyvinyl chloride film are applied on a metal screen, over which a sheath of polyvinyl chloride plastic compound of brands AVVG, VVG, APVG, PVG, APvVG, PvVG is applied [1]

The power cable we offer has the following design:

- conductive copper or aluminum conductors;

- insulation from a polyvinyl chloride composition of reduced fire hazard;

- a tow of polymeric material of reduced combustibility (its absence is allowed);

- a bonding winding of tapes of polymeric material, superimposed with a gap, or difficult to combustible fibrous material, superimposed overlapping (the absence of a bonding winding is allowed);

- the inner shell of the polyvinyl chloride composition of low fire risk, extruded while filling the inter-core space. It is allowed to fill between the cores with bundles of polymer material of reduced fire hazard;

- an electrically conductive screen of tapes of an electrically conductive fibrous material. The electrically conductive screen may be made of tapes of an electrically conductive cable paper or extruded from an electrically conductive polymer material;

- a metal screen made of copper tapes or tapes of copper foil;

- a separation layer of tapes difficult to combustible non-woven fabric;

- the outer shell of the polyvinyl chloride composition of low fire hazard.

TECHNICAL RESULT

Due to the increased demand in the national economy for cable and conductor products that do not spread combustion when laying in bundles, and also emit a minimum amount of smoke, corrosive and toxic combustion products in case of fire, in order to increase the level of technical and operational parameters of power cables, power cable design with plastic insulation for a rated alternating voltage of 6 kV at a frequency of 50 Hz with improved fire safety indicators.

The main design feature of this cable is the materials used for its manufacture, which reduce the combustibility of the cable product.

The development advantage over the analogue lies in the fact that the cable of the proposed design during installation and operation does not require additional fire protection costs. The use of polymer compositions of reduced fire hazard, which ensures a lower emission of smoke and hydrogen chloride during combustion, as well as the use of slow-burning polymer (fibrous) materials, allows this cable to be used in places with a large concentration of people.

INFORMATION CONFIRMING THE OPPORTUNITY

IMPLEMENTATION OF A USEFUL MODEL

Figure 1, 2, 3 shows a power cable that contains metal cores (1). An extrusion insulation was applied to the cores (2) from a low fire hazard polyvinyl chloride composition. Insulated conductors are twisted around a bundle (3) of a low fire hazard PVC compound (no central bundle is allowed). A fastening winding (4) is applied over twisted insulated cores. A fastening winding made with a tape of polymer material is superimposed with a gap whose width is much greater than the width of the tape. The fastening winding made of tapes made of hard combustible polymeric or difficult to combustible fibrous material is overlapped, and the space between the cores is filled with strands made of a low fire hazard polyvinyl chloride composition (3). An inner sheath has been applied over extruded insulated cores or fastening windings by extrusion from a polyvinyl chloride composition of reduced fire hazard (5). The inner sheath is superimposed with the simultaneous filling of the gaps between the cores, if it is applied over twisted insulated cores or over a fastening winding imposed with a gap. An electrically conductive screen (6) of tapes (s) of an electrically conductive non-woven fabric is applied over the inner shell by winding. It is allowed to conduct the electrically conductive screen by winding from two tapes of electrically conductive paper, or it can be extruded from electrically conductive material. A metal screen (7) of two copper tapes is applied over the electrically conductive screen by winding. A spacer layer (8) of hard-combustible non-woven fabric tapes was applied over the metal screen by winding. On top of the separation layer by extrusion, an outer shell (9) of a low fire hazard polyvinyl chloride composition is applied.

The cable according to the claimed model is 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, including for laying in the open air.

Long-term permissible core heating temperature - 70 ⁰ С.

The most admissible temperature at short circuit currents is 160 ⁰ С.

Permissible core heating in emergency mode - 80 ⁰ С.

The cable can be laid without preheating at a temperature not lower than minus 15 ⁰ C.

Cable service life of at least 30 years. The actual service life is not limited to the specified, but is determined by the technical condition of the cable.

Bibliography:

1. GOST 16442-80 Power cables with plastic insulation.

2. Production of cables and wires using plastics and rubber, 1992, A.G. Grigoryan, D.N. Dickerman, I. B. Peshkov.

3. Fundamentals of cable technology, 2006, under. ed. I. B. Peshkova.

4. Cables and wires No. 6, 2003, Dovzhenko I.G.

5. Cables and wires No. 6, 2003, Kamensky MK, Peshkov IB

Claims (3)

1. Power cable with conductive copper or aluminum single or multi-wire cores, insulated with polyvinyl chloride plastic compound, twisted into a core, with an inner sheath (belt insulation) extruded from polyvinyl chloride plastic compound, with an electrically conductive screen made of conductive paper tapes and a metal screen over which with overlapping tape of polyethylene terephthalate (polyvinyl chloride) film and a sheath of polyvinyl chloride plastic compound, characterized in that the insulation is conductive yaschih conductors, the inner and outer shell are made of polyvinyl chloride compositions, low flammability. 2. The power cable according to claim 1, characterized in that on top of the twisted insulated conductors, a fastening winding of refractory polymer (fibrous) material is superimposed with overlapping, while filling the space between the insulated conductors is made of bundles of a low fire hazard polyvinyl chloride composition. 3. The power cable according to claim 1 or 2, characterized in that on top of the metal screen by the method of winding, a separating layer of tapes of a nonflammable nonwoven fabric is applied.