JPS581929Y2 - plastic insulated power cable - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a plastic insulated capeple with a metal base such as an aluminum sheath or a lead sheath.

Generally, in plastic insulated cable cables, the plastic insulator expands thermally due to temperature rise during operation, so it is necessary to create a gap between the metal sheath and cable core in advance to account for this thermal expansion. .

In this case, since the electrical contact between the cable core and the metal ground is insufficient, conventionally a copper tape, metal wire, etc. has been interposed on the cable core to serve as a shielding layer.

However, in this case, double metal rolling is performed using the metal sheath and the copper tape or metal wire used as the shielding layer, which has the disadvantage of being economically unfavorable.

The purpose of this invention is to provide a plastic insulated cable that can eliminate the above-mentioned drawbacks and improve economical efficiency. It is formed by winding it around.

Hereinafter, one embodiment of the plastic insulated cage according to the present invention will be described with reference to the drawings.

An inner semiconducting layer 2 is provided around the conductor 1, and an insulating layer 3 of plastic is coated on the outside of the inner semiconducting layer 2.

An external semiconductive layer 4 is provided on the outer periphery of the insulating layer 3, and two layers of woven fabric chive (Kanayama tape) 8 made of plastic fibers containing conductive rubber and coated with metal wire are wound alternately on the outside of the external semiconductive layer 4. A formed shielding layer 5 is provided, a metal sheath 6 is provided on the outside of the shielding layer 5, and a corrosion protection layer 7 is formed on the outermost periphery.

The conductive rubberized metal wire-containing woven fabric tape 8 forming the shielding layer 5 adheres well to the cable core due to the adhesive force of the rubber, so it follows the thermal expansion and contraction of the insulating layer 3 during cable operation. can do.

By subjecting the woven fabric tape 8 to conductive rubber coating, good electrical contact between the cable core and the metal sheath 6 can be obtained.

In addition, the rubber coating increases the frictional force between the metal sheath 6 and the cable core, which is advantageous in terms of the cable installation method.

Furthermore, by alternately winding two layers of the woven fabric tape 8, the inductance of the shielding layer 5 can be reduced.

This shielding layer can then function as a good mechanical protection layer for the metal sheath and cable core.

As described above, the plastic insulation type cable &! Instead of the copper tape or metal wire that was conventionally used as a shielding layer, two layers of woven tape with conductive rubberized metal wire are wound alternately to improve economic efficiency and provide advantages in terms of cable installation method. In addition, the inductance of the shielding layer can be reduced, and it also has the effect of functioning as a mechanical protective layer for the metal base and cable core.

[Brief explanation of the drawing]

The figure is a sectional view of an embodiment of the plastic insulated capeple of the present invention. 1: conductor, 2: inner semiconducting layer, 3: insulating layer, 4: outer semiconducting layer, 5: shielding layer, 6: metal base, 8: woven tape.

Claims (1)

[Scope of utility model registration request] A plastic insulated case is formed by sequentially forming an inner semiconducting layer, an insulating layer, an outer semiconducting layer, a shielding layer, and a metal conductor on a conductor, and the shielding layer is covered with a conductive rubber-coated metal wire. A plastic insulated capeple characterized by being formed by alternating two layers of woven tape.