JPH0518234U - Power cable connection - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a connection part of a power cable in which the adhesion between the outer semiconductive layer of the connection part and the cable insulator is improved and the insulation performance of the connection part is improved. [Structure] A power cable connecting portion in which a reinforcing insulator made of the same insulating material as the cable insulator is formed over the outer circumference of the cable outer semiconductive layer, and a connecting portion outer semiconductive layer is provided on the outer circumference of the reinforcing insulator. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a connecting portion of a plastic insulated power cable such as a crosslinked polyethylene insulated power cable (CV cable).

[0002]

[Prior Art]

 FIG. 3 is a vertical cross-sectional view of a main part of a conventional plastic insulated power cable such as a CV cable. In the drawings, 1 is a power cable such as a CV cable, 11 is a conductor, 12 is a cable insulator such as crosslinked polyethylene, and 13 is an outer semiconductive layer of the cable. Reference numeral 2 is a conductor connecting portion, 3 is a semiconductive layer inside the connecting portion, and 4 is a reinforcing insulator formed on the outside of the conductor connecting portion 2, and is an uncrosslinked material containing the same insulating material as that of the cable insulator 12, for example, a crosslinking agent. The polyethylene mixture is extruded or wrapped with an uncrosslinked polyethylene tape, and the outer semiconductive layer 5 at the connecting portion is provided on the outer periphery of the polyethylene tape, and then the reinforcing insulator 4 is crosslinked to form.

[0003]

[Problems to be solved by the device]

 Conventionally, such a connecting portion is formed by peeling off the vicinity of the end of the outer semiconductive layer 13 of the cable 1. For the connecting part external semiconductive layer 5, for example, a heat-shrinkable tube using semi-crosslinked polyethylene containing carbon is used, and the reinforcing insulator 4 and the external semiconductive layer 13 formed on the conductor connecting part 2 are peeled off. The end portion of the cable insulator 12 is placed on the outer semi-conductive layer 13 of the cable 1 so as to cover the cable insulator 12, and is heated and shrunk by the heat when the reinforcing insulator 4 is bridged to be integrally formed.

However, since the cable insulator 12 and the outer semiconductive layer 13 of the cable are crosslinked polyethylene, it is difficult to bond the half-crosslinked heat-shrinkable tube by heat shrinking, and it is difficult to set the bonding condition. In particular, if the interface between the cable insulator 12 and the external semiconductive layer 5 formed on the cable insulator 12 is poorly adhered, there is a problem that the insulating performance of the connection portion deteriorates.

[0005]

[Means for Solving the Problems]

 The present invention solves the above-mentioned problems, improves the connection between the outer semiconductive layer of the connection portion and the cable insulator, improves the insulation performance of the connection portion, and improves the reliability of the connection portion of the power cable. The present invention is characterized in that a reinforcing insulator made of the same insulating material as that of the cable insulator is formed over the outer circumference of the cable outer semi-conductive layer, and the connecting portion outer semi-conductive layer is formed on the outer circumference of the reinforcing insulator. It has been done.

[0006]

[Action]

 In the above-mentioned connection portion of the present invention, the reinforcing insulator is formed on the outer circumference of the outer semiconductive layer of the cable. Therefore, the reinforcing insulator is interposed between the outer semiconductive layer of the connecting portion and the cable insulator provided thereon. Moreover, this reinforced insulator is made of the same kind as the cable insulator, for example, an uncrosslinked polyethylene material, and even when the reinforced insulator is crosslinked, a semi-crosslinked heat-shrinkable tube that forms the outer semiconductive layer of the connection part is also used. At the same time, it is heat-shrinked, and good adhesion is obtained between the cable insulator and the reinforcing insulator.

[0007]

【Example】

 FIG. 1 is a vertical cross-sectional view of a concrete example of a connecting portion according to the present invention, and FIG. 2 is an enlarged vertical cross-sectional view of a main portion of FIG. The same reference numerals as in FIG. 3 represent the same parts. As shown in the drawings, in the connection of the present invention, the end of the reinforcing insulation 4 formed on the conductor connection 2 extends to the end of the outer semiconductive layer 13 of the cable. As a result, the extended reinforcing insulator 4a is interposed between the cable insulating body 12 and the outer semiconductive layer 5 of the connecting portion formed on the outer periphery of the reinforcing insulating body 4. Is not cross-linked and has good adhesiveness, the heat-shrinkable semi-cross-linking tube that forms the external semi-conductive layer 5 at the connecting portion is also heat-shrinked at the time of cross-linking the reinforcing insulator 4, and the cable is extended via the extension 4a of the reinforcing insulator 4. Good adhesion with the insulator 12 is obtained.

The extension 4a of the reinforcing insulator 4 has a thickness of about 1.0 mm or less. For example, when extruding the reinforcing insulator 4, extrude it or use the same uncrosslinked polyethylene tape as the reinforcing insulator 4 It is formed by winding one layer by winding two layers.

[0009]

[Effect of the device]

 As described above, according to the power cable connection part of the present invention, the reinforcing insulation extends over the outer circumference of the cable outer semiconductive layer, and the outer insulation semiconductive layer and the cable insulation provided on the reinforcing insulation. Good adhesion can be obtained by interposing a reinforced insulator between and. As a result, the insulation performance of the adhesive portion is improved and the reliability is improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a specific example of a connection portion of a power cable according to the present invention.

FIG. 2 is an enlarged vertical sectional view of a main part of FIG.

FIG. 3 is a vertical cross-sectional view of a main part of a conventional connecting portion.

[Explanation of symbols]

 1 CV cable 11 conductor 12 cable insulator 13 cable outer semi-conductive layer 2 conductor connection part 3 connection part inner semi-conductive layer 4 reinforced insulation 4a reinforced insulation extension part 5 connection part outer semi-conductive layer

Claims (1)

[Scope of utility model registration request] 1. A reinforcing insulator made of the same insulating material as that of the cable insulator is formed on the outer circumference of the cable outer semiconductive layer, and a connecting portion outer semiconductive layer is provided on the outer circumference of the reinforcing insulator. And the connection part of the power cable.