RU166201U1 - MEDIUM VOLTAGE CABLE CONNECTOR - Google Patents

Abstract

A connecting sleeve for medium voltage cables, comprising a connecting sleeve installed on the insulation-free ends of the cores of the connected cables and sequentially coated with an electrically conductive tape to the insulation level and a heat-shrinkable electrically conductive tube, an electrically conductive tape superimposed on the portions of the screen ends of the cables with access to their insulation, and also on sections of a heat-shrinkable electrically conductive tube, a heat-shrinkable tube for regulating the electric field strength and a two-layer insulation / an electrically conductive heat-shrinkable tube, wherein the heat-shrinkable tube for regulating the electric field strength includes ZnO ceramic grains uniformly distributed in the polymer matrix of the tube material, and the insulation surface, heat-shrinkable electrically conductive tube, an electrically conductive tape superimposed on screen shields for cable insulation, as well as on heat-shrinkable sections conductive tube before shrinkage of a heat-shrinkable tube for regulating the electric field intensity are covered with silicon anicheskoy insulating paste, the surface of the heat shrinkable tube regulation of the electric field before shrinkage two-layer insulating / conductive tube so as silicone coated insulating paste.

Description

The utility model relates to the design of couplings from heat-shrinkable products for power cables for a voltage of 10-35 kV (medium voltage) and, to a greater extent, to couplings for three-core cables of medium voltage with insulation made of cross-linked polyethylene with round and sector conductors.

A known construction of a connection sleeve [1] for a power cable, comprising a connector of the ends of at least one current-carrying core, a first layer of insulation coating covering the connector, a second layer of insulation coating covering the first layer of insulation coating and a metal screen located on the outside from the second layer of insulation coating. As a distinctive feature in the coupling, the use of a transforming layer containing a finely dispersed conductive filler - soot is proposed.

The results of measuring the onset and extinction of partial discharges (PD) for various models of end sleeves can be extended to the design of the coupler, since the latter consists of two end sleeves symmetrically located relative to the cable conductor connector and additionally containing an insulated heat-shrinkable tube shielded by an electrically conductive and metal screens.

The technical result, which the utility model aims to achieve, is to increase the reliability of the coupler and increase its service life by increasing the voltage of the occurrence of partial discharges.

The technical result is achieved by the fact that the coupling for the medium voltage cable contains a connecting sleeve that is installed on the insulation-free ends of the cores of the cables to be connected, coated with an electrically conductive tape to the level of cable insulation, a heat-shrinkable electrically conductive tube superimposed in the center of the sleeve and covering the insulation sections of the connected cables, an electrically conductive tape superimposed on the edges of the screens for cable insulation and cable insulation sections, an electrically conductive tape superimposed on the term sections shrinkable electrically conductive tube and adjacent sections of cable insulation, heat-shrinkable tube for regulating electric field strength (TREP), covering areas with superimposed electrically conductive tape, loose cable insulation sections and heat-shrinkable electrically conductive tube, external insulated shielded heat-shrinkable tube, covering heat-shrinkable tube for regulating electric field, at the same time the thermoseated tube of regulation of intensity of an electric field This turns the ZnO grain ceramic uniformly distributed in the polymeric matrix material of the tube, and the whole surface under the Trap, prior to shrinkage, coated with a thin layer of silicone adhesive paste, while the outer surface of the Trap, post shrinkage also coated with a thin insulating layer of silicone paste.

The essence of the utility model is illustrated in the drawing.

The coupling sleeve of the cables 1 to be connected includes a sleeve 2 mounted on the insulation-free 3 ends of the cores of the cables to be connected 1. An electrical conductive tape 4 is applied to the sleeve 2 to the insulation level 3 of cable 1, onto which the heat-shrinkable conductive tube 5 is seated. 6, the insulation sections 3 of the cables 1 and the edges of the conductive tube 5 are superimposed on the conductive tape 7. The insulation surface of 3 cables 1, the conductive tape 7 and the conductive tube 5 lubricates a thin layer of organosilicon electrical insulating paste. Then, along the entire length of the connected and prepared cable sections 1, TREP 8 is installed and shrunk, which contains ZnO ceramic grains uniformly distributed in the polymer matrix of the tube material 8. After the shrinkage, the outer surface of the TREP 8 is lubricated with a thin layer of organosilicon electrical insulating paste. The cable insulation is restored due to the shrinkage of the outer two-layer insulating / electrically conductive heat-shrinkable tube 10. A layer of tinned copper mesh tape 11 is applied over the two-layer electrically insulating / electrically conductive heat-shrinkable tube 11. Consecutively, in a known manner, the wires of the cable screen are connected and the cable sheath is restored. The coupling may further comprise a protective casing (not shown).

List of references

1. Utility model for termination for power cable (No. 70415).

Claims (1)

A connecting sleeve for medium voltage cables, comprising a connecting sleeve installed on the insulation-free ends of the cores of the connected cables and sequentially coated with an electrically conductive tape to the insulation level and a heat-shrinkable electrically conductive tube, an electrically conductive tape superimposed on the portions of the screen ends of the cables with access to their insulation, and also on sections of a heat-shrinkable electrically conductive tube, a heat-shrinkable tube for regulating the electric field strength and a two-layer insulation / an electrically conductive heat-shrinkable tube, wherein the heat-shrinkable tube for regulating the electric field strength includes ZnO ceramic grains uniformly distributed in the polymer matrix of the tube material, and the insulation surface, heat-shrinkable electrically conductive tube, an electrically conductive tape superimposed on screen shields for cable insulation, as well as on heat-shrinkable sections conductive tube before shrinkage of a heat-shrinkable tube for regulating the electric field intensity are covered with silicon anicheskoy insulating paste, the surface of the heat shrinkable tube regulation of the electric field before shrinkage two-layer insulating / conductive tube so as silicone coated insulating paste.

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