JP2000222948A - Solid insulated power cable with corrugated aluminum cladding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the water leakage, and to lower the cost by providing an external semiconductive layer, a water absorbing semiconductive tape wound layer, a metal wire woven cloth tape wound-with-gap layer as a metal shield layer, and corrugated aluminum cladding on a cable core in this order. SOLUTION: On and external semiconductive layer 1a of a cable core 1 provided with a solid insulating layer such as bridged polyethylene, one surface of a fabric base material is coated with the semiconductive rubber composition, and the other surface thereof is coated with the water absorbing semiconductive composition, and this double-coated fabric base material is wound while being overlapped so as to provide a water absorbing semiconductive tape wound layer 2. An expensive metal wire woven tape wound layer 3 as a shield layer provided on the wound layer 2 and formed by weaving the metal wire in the vertical yarn direction is wound with an appropriate space as a gap. With this structure, quantity of use is lowered without hindering the water leakage preventing effect. Corrugated aluminum cladding 4 is provided thereon. Water absorbing performances given by coating or dipping one surface or both surfaces of the metal wire woven cloth tape with the water absorbing rubber, and water leakage preventing effect is further improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid insulated power cable having a corrugated aluminum jacket provided with a structure for preventing water running.

[0002]

2. Description of the Related Art In a solid insulated power cable having a solid insulating layer made of, for example, cross-linked polyethylene on a conductor and having a corrugated aluminum cover on the outside, if the corrugated aluminum cover is partially damaged, water will flow in the cable. Into the cable, causing water to run along the length of the cable, resulting in deterioration of the electrical performance of the cable and sometimes dielectric breakdown.

FIG. 2 is a schematic longitudinal sectional view of an essential part of an example of a solid insulated power cable having a corrugated aluminum sheath provided with a water running prevention structure for preventing an accident caused by water running as described above. As shown in the drawing, a water-absorbing semiconductive tape 2 and a conductive metal wire such as a copper wire as a shielding layer are woven on an outer semiconductive layer 1a of a cable core 1 provided with a solid insulating layer such as crosslinked polyethylene. The embedded water-absorbing tape 3 is shifted in the width direction and wound in two layers, or two sheets are overlapped and wound together to form a water-streaking prevention layer, on which a corrugated aluminum cover is provided.

The above water-absorbing conductive tape is prepared by applying a semiconductive rubber composition to one surface of a substrate made of, for example, a thick woven fabric,
On the other side, a water-absorbing semiconductive rubber composition is applied. The water-absorbing metal wire woven tape as the shielding layer is constituted by impregnating or coating a water-absorbing composition on both surfaces of a metal wire woven cloth tape in which a conductive metal wire such as a copper wire is woven in the warp direction. Have been.

[0005]

The above-mentioned conventional solid-insulated power cable having a water-running-preventing structure has a structure in which a water-absorbing semiconductive tape and a water-absorbing metal wire woven tape as a shielding layer are overlapped while being shifted in the width direction. Alternatively, since the two tapes are overlapped and wound together, a high-priced metal wire woven tape needs to be the same length as the water-absorbing semiconductive tape, resulting in high cost.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems and to provide a solid insulated power cable having a corrugated aluminum sheath having a water-prevention structure with excellent water economy, which has reduced costs. The feature is that a water-absorbing semiconductive tape winding layer is provided on the outer semiconductive layer on the cable core, and a metal wire woven cloth tape is gap-wound thereon as a metal shielding layer, and the A solid insulated power cable provided with an aluminum sheath.

[0007]

FIG. 1 is a schematic longitudinal sectional view of an essential part of a specific example of a solid insulated power cable having a corrugated aluminum jacket provided with a water running prevention structure according to the present invention. Outer semiconductive layer 1a of cable core 1 provided with a solid insulating layer such as cross-linked polyethylene.
The tape wound layer 2 is formed by coating a semiconductive rubber composition on one surface of a woven fabric substrate as described above, and superposing and winding a water absorbing semiconductive tape coated with a water absorbing semiconductive composition on the other surface. Is provided thereon, and a tape winding layer 3 in which a metal wire woven tape in which a metal wire is woven in a warp direction is provided as a shielding layer by gap winding at an appropriate interval is provided thereon, and further, a bottom portion of a wave portion is provided thereon. A corrugated aluminum cover 4 is provided in contact with the metal wire woven tape winding layer.

[0008] In this case, since the metal wire woven tape is gap-wound on the water absorbing semiconductive tape winding layer, the metal wire woven tape does not need to be particularly water absorbent. By impregnating or applying a water-absorbing composition (for example, a water-absorbing rubber) on one or both surfaces of the base material constituting the tape, it is expected that the performance of preventing water running is further improved.

[0009]

As described above, according to the solid insulated power cable having the corrugated aluminum sheath of the present invention, the effect of preventing water running is impaired by winding the gap between the metal wire woven tape as the shielding layer. It is possible to significantly reduce the amount of expensive metal wire woven tape used in comparison with conventional products, and to provide a corrugated aluminum solid insulated power cable with water running prevention structure that is excellent in economy. can do.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of a main part of a specific example of a solid insulated power cable having a corrugated aluminum jacket of the present invention.

FIG. 2 is a schematic vertical sectional view of a main part of an example of a conventional solid insulated power cable having a corrugated aluminum jacket having a water running prevention structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cable core 2 Water absorbing semiconductive tape winding layer 3 Metal wire weaving tape winding layer 4 Corrugated aluminum coating

Claims (2)

[Claims] 1. A solid insulated power cable having a corrugated aluminum sheath, comprising: an outer semiconductive layer on a cable core;
A water-absorbing semiconductive tape winding layer is provided, a metal wire woven cloth tape is gap-wound as a metal shielding layer thereon, and a corrugated aluminum covering is further provided thereon. Solid insulated power cable. 2. A water absorbing property is given to a metal wire woven cloth tape constituting said metal shielding layer.
A solid insulated power cable having a corrugated aluminum jacket as described.