RU139755U1 - HIGH VOLTAGE ELECTRIC CABLE - Google Patents

Abstract

1. High-voltage electric cable containing at least one conductive core, a semiconducting screen for each core and insulation on top of the screen, based on ethylene-propylene rubber, an external semiconductor screen for insulation of the core, a copper screen, an inner and outer protective sheath, characterized in that a winding is made of an electrically conductive water-blocking tape along the outer semiconducting screen, and a sticky, stitched semiconducting compound based on a PE copoly is used as the material of the semiconducting screens measure easily detachable from isolation. 2. The cable according to claim 1, characterized in that a metal protective armor cover is laid between the inner and outer protective shells. The cable according to claim 2, characterized in that the metal protective armor cover is made of galvanized steel wire. The cable according to claim 2, characterized in that the metal protective armor cover is made of aluminum alloy wires. The cable according to claim 2, characterized in that the metal protective armor cover is made of galvanized steel tapes. The cable according to claim 1, characterized in that the copper screen is made of copper wires and fastened with a copper tape. Cable according to any one of claims 1 to 6, characterized in that the inner and outer sheaths are made of polyethylene. Cable according to any one of claims 1 to 6, characterized in that the inner and outer sheaths are made of PVC compound. Cable according to any one of claims 1 to 6, characterized in that the inner and outer sheaths are made of a halogen-free composition.

Description

The proposed utility model relates to cable technology, in particular, to the design of electric cables with insulation from ethylene propylene rubber, and can be used for transmission and distribution of electrical energy in stationary installations, designed for alternating voltage from 6 to 35 kV with a rated current frequency of 50 Hz for networks with grounded and isolated neutral.

There are various technical solutions in this area.

So known is a power shielded cable (RF patent for utility model No. 81839, H01B 9/00) in which the cable contains several copper multi-wire conductive conductors insulated with cross-linked polyethylene. Cores or groups are twisted into a core. The voids in the core are filled with a polymer aggregate based on polyvinyl chloride plasticate. On top of the common screen, a moisture-proof sheath is made of oil-and-oil-resistant, sea-water and sea-fog resistant polyvinyl chloride plastic compound or polychloroprene rubber, or chlorosulfonated polyethylene.

Known electrical cable (RF patent for the invention No. 1090170). The known cable contains at least one conductive core, three protective screens - a screen along the core, a screen on insulation on the core and a common electrical screen, where all screens are made of conductive rubber (based on nitrile butadiene rubber with a vulcanizing agent of sulfur-containing organic compounds), the insulation on the screen along the core was made by vulcanizing a composition based on ethylene propylene rubber with a peroxide vulcanizing agent, and the cable sheath was obtained by vulcanizing a composition based on chloropropylene rubber ka with a curing agent.

The closest, in combination of essential features, is an electric cable (RF patent 101576 published. 01.20.2011) which is selected as a prototype. This cable contains at least one conductive core, a shield for each core of conductive rubber, insulation on top of the screen of ethylene propylene rubber, a shield for insulation of the core of conductive rubber, inner and outer sheaths. According to the proposed utility model, in addition, a copper screen is placed over each insulation screen, a layer of semiconducting tapes based on paper or rubberized fabric is laid between the insulation screen and the copper screen, while the inner and outer sheaths of the cable are made of non-combustible thermoplastic material. For a cable laid in the ground, a metal protective armor cover is laid between the inner and outer sheaths.

The disadvantage of analogues and prototype is the lack of a water-blocking barrier, which can adversely affect the reliability and service life of the cable, and the difficulty with installing the cable, since the outer semi-conductive layer of rubber is difficult to separate from the insulation. The purpose of the proposed utility model is to create a reliable and easy to install high-voltage cable.

The technical result is to increase the reliability of the proposed cable and ease of installation.

The technical result is achieved in that the electric cable contains at least one conductive core, a shield for each core of a conductive compound, insulation on top of the screen of ethylene-propylene rubber, a screen for insulation of the core of a conductive compound, a copper screen is placed on top of each shield for insulation , a layer of semiconducting tapes, protective shells are laid between the insulation shield and the copper screen. According to the proposed utility model, the screen for each core and the screen for insulation of the core are made of an adhesive, crosslinkable and semi-conductive compound based on a PE copolymer, which under certain conditions can be easily separated from the insulation. A winding of electrically conductive water blocking tape is made on the outer semiconducting screen.

Additional features of the proposed utility model are:

- for a cable laid in the ground, a metal protective armor cover can be laid between the inner and outer sheaths,

- metal protective armor cover can be made of galvanized steel wires,

- metal protective armor cover can be made of aluminum alloy wires,

- metal protective armor cover can be made of galvanized steel tapes,

- the copper screen is made of copper wires and fastened with a copper tape,

- the inner and outer protective shells are made of polyethylene,

- the inner and outer protective shells can be made of PVC plastic,

- the inner and outer protective shells can be made of a halogen-free composition.

The essence of the utility model is illustrated in FIG. 1 and 2 which show examples of high-voltage cable (in section), where in FIG. one

1 - copper conductive core;

2 - a semiconducting layer of cross-linked compound;

3 - insulation from ethylene propylene rubber;

4 - semiconducting layer of crosslinked compound;

5 - winding of an electrically conductive water blocking tape;

6 - screen made of copper wires;

7 - the inner shell;

9 - outer shell.

in FIG. 2 is a cross section of a three-wire electric cable, where

1 - copper conductive core;

2 - semiconducting layer of cross-linked cable compound;

3 - insulation from ethylene propylene rubber;

4 - a semiconducting layer of cross-linked cable compound;

5 - winding of an electrically conductive water blocking tape;

6 - screen made of copper wires;

7 - the inner shell;

8 - armor;

9 - outer shell.

In the proposed cable, the copper conductive core 1, with a superimposed semiconducting layer 2, made of a crosslinkable and semiconducting compound based on a PE copolymer, is insulated with ethylene-propylene rubber 3. A shield of a crosslinkable and semiconducting compound based on a PE copolymer 4 is applied to the insulation by winding an electrically conductive water blocking tape 5 is applied to the semiconducting layer, on which a metal shield 6 is applied by the method of winding. In a three-core cable, an inner sheath is laid on three twisted shielded cores of polymer 7, the inner shell may be steel armor 8 is superimposed on the single-core cable screen, an inner sheath or armor superimposed three-core cable outer jacket 9.

The sequence of operations in the manufacture of the proposed cable is as follows:

- drawing of copper or aluminum wires for conductive core 1 and screen 6 on a drawing machine;

- twisting of copper wires into core 1 on a twisting machine;

- the application of a semiconducting layer 2, insulation 3 and a semiconducting layer 4 by extrusion on a continuous vulcanization line;

- the application of an electrically conductive water blocking layer 5 by winding from tape, copper wires of the screen 6 by the method of winding, bonding the wires with copper tape on a shielding machine;

- twisting of shielded veins of a three-core cable on a twisting machine;

- imposition on the twist of the inner shell 7 by extrusion on an extrusion line;

- the imposition of armor 8 on the reservation machine;

- the imposition of the outer shell 9 by extrusion on an extrusion line.

The proposed cable has advantages over known technical solutions, namely, the presence of a water blocking layer of an electrically conductive water blocking tape 5 provides longitudinal sealing. In addition, in the proposed design, as a semiconducting layer 2, 4, an adhesive, crosslinkable and semiconductive compound based on a PE copolymer is used, the use of this compound provides easy removal of the outer semiconducting layer strictly along the boundary of the insulation and the semiconducting layer, the presence of an easily removable outer semiconductive screen allows high-quality and fast installation of an electric cable without the use of expensive equipment. In order to equalize the potentials on the cable screen, since the screen wires are laid with a gap, a copper tape with a gap is imposed on the screen wires by the winding method, which provides an electrical connection of the screen wires with a low electrical resistance. As a result, increased reliability and ease of installation of the proposed high-voltage cable is provided.

Claims (9)

1. High-voltage electric cable containing at least one conductive core, a semiconducting screen for each core and insulation on top of the screen, based on ethylene-propylene rubber, an external semiconductor screen for insulation of the core, a copper screen, an inner and outer protective sheath, characterized in that a winding is made of an electrically conductive water-blocking tape along the outer semiconducting screen, and a sticky, stitched semiconducting compound based on a PE copoly is used as the material of the semiconducting screens measure easily separable from isolation. 2. The cable according to claim 1, characterized in that a metal protective armor cover is laid between the inner and outer protective shells. 3. The cable according to claim 2, characterized in that the metal protective armor cover is made of galvanized steel wires. 4. The cable according to claim 2, characterized in that the metal protective armor cover is made of aluminum alloy wires. 5. The cable according to claim 2, characterized in that the metal protective armor cover is made of galvanized steel tapes. 6. The cable according to claim 1, characterized in that the copper screen is made of copper wires and fastened with a copper tape. 7. Cable according to any one of claims 1 to 6, characterized in that the inner and outer sheaths are made of polyethylene. 8. Cable according to any one of claims 1 to 6, characterized in that the inner and outer sheaths are made of PVC compound. 9. Cable according to any one of claims 1 to 6, characterized in that the inner and outer sheaths are made of a halogen-free composition.

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