RU42352U1 - POWER MULTI-CABLE CABLE WITH WATER-BLOCKING ELEMENTS - Google Patents

Abstract

The utility model relates to cable technology, namely to the design of power cables with plastic insulation and sheath. The cable contains from three to five single-wire or multi-wire conductive cores insulated with a cross-linked polyethylene composition, twisted into a core, over which a belt insulation and an outer sheath of polyvinyl chloride plastic compound or of a thermoplastic polyethylene composition are applied by extrusion, the central gap between the cores is twisted with a strand of water or water-blocking tapes, and one water-blocking tape is helically superimposed on top of the core with overlapping. The cable may also contain spirally overlaid armor from two steel bands over the belt insulation. The cable may also have stranded conductive conductors containing water-blocking powder or in deblocking threads. EFFECT: longitudinal sealing of a cable.

Description

The utility model relates to cable technology, namely, to the construction of power cables with plastic insulation and a sheath, designed for the transmission and distribution of electrical energy in stationary electrical installations at an alternating voltage of 1000 V at a nominal frequency of 50 Hz at an ambient temperature from minus 40 ° С to plus 60 ° C and relative humidity up to 98% at a temperature of plus 35 ° C.

Known power cables of the brand APvBbShp, PvBbShp, APvShv, APvBbShv, PvBbShv, APvVG, PvVG, ApvBbShv, PvBbShv, APvVng (A) -LS, PvVng (A) -LS, APvBbShShng (APvBbShShng (A) aluminum or copper conductive conductors, insulation from a cross-linked polyethylene composition, a belt insulation and an outer sheath from polyvinyl chloride plastic compound or from a composition of thermoplastic polyethylene (Power cables with insulation from silanol-cross-linked polyethylene for a voltage of 1 kV TU 16.K71-277-98).

However, such cables do not meet the longitudinal waterproofing requirements.

The task was to develop a power cable design that is resistant to the longitudinal distribution of water.

The technical result is achieved by the fact that a power cable containing from three to five single-wire or multi-wire conductive conductors isolated by a cross-linked polyethylene composition is twisted into a core, on top of which a belt insulation and an outer sheath of polyvinyl chloride plastic compound or of a thermoplastic polyethylene composition are applied by extrusion, the central gap between with strands during twisting, it is filled with a bundle of water-blocking threads or water-blocking tapes, and spirally overlaid with covered with one water blocking tape.

The cable may also further comprise, on top of the belt insulation, spirally imposed armor of two steel tapes.

The cable may also have multi-conductor conductors containing water-blocking powder or water-blocking threads.

The utility model is illustrated in the drawing, which shows a power cable in section.

The cable contains copper or aluminum single-wire or multi-wire conductive conductors 1, insulation 2 from a cross-linked polyethylene composition, insulated conductors are twisted into a core, the central gap between the conductors is filled with a bundle 3 made of water-blocking threads or water-blocking

tapes, spiral winding 4 made of water blocking tape, belt insulation 5 and outer shell 6 of polyvinyl chloride plastic compound or thermoplastic polyethylene composition, armor 7 of two steel tapes, applied over belt insulation, water blocking powder or water blocking threads 8 in multiwire conductive conductors .

The following is information confirming the feasibility of implementing a utility model.

Crosslinked polyethylene is used as insulation material for 2 cables.

As the material of the belt insulation 5 and the outer sheath 6 of the cable, polyvinyl chloride plastic compound or thermoplastic polyethylene is used.

Used for the manufacture of the proposed cable polymer compositions are manufactured industrially.

Water-blocking threads, tapes and powder are produced industrially.

Conductors 1 are made of copper or aluminum wire, traditional for electrical cables.

Cable elements are twisted using conventional twisting equipment.

Insulation 2, belt insulation 5 and the outer shell 6 are applied to the extrusion equipment according to the standard process RD 16.K00-004-95.

The imposition of a water blocking tape 2 is carried out on a known winding equipment, traditionally used in the cable industry.

The imposition of armor 7 of the two steel strips is carried out on known equipment, traditionally used in the cable industry.

Samples of the proposed power cable were tested for longitudinal water permeability according to IEC 60502-2.

The results are shown in the table.

Cable specifications

Name Technical Cable product specifications requirements Famous cable The proposed cable for p. 1,2 Resistance to longitudinal water permeability The length of water penetration after 5 days is not more than 1.5 m to the left and right of the place of water supply more than 3.0 m 0.5 m, corresponds

Claims (3)

1. Power cable containing from three to five single-wire or multi-wire conductive conductors isolated by a cross-linked polyethylene composition, twisted into a core, over which a belt insulation and an outer sheath of polyvinyl chloride plastic compound or of a thermoplastic polyethylene composition are applied by extrusion, characterized in that the central gap between with strands during twisting, it is filled with a bundle of water-blocking threads or water-blocking tapes, and one water block is spirally imposed over the core with overlapping kiruyuschaya tape. 2. The cable according to claim 1, characterized in that it further comprises, on top of the belt insulation, spirally imposed armor of two steel tapes. 3. The cable according to claim 1 or 2, characterized in that the multi-wire conductive conductors contain water-blocking powder or water-blocking threads.