JPH07336835A - Connecting section for power cable - Google Patents

Abstract

PURPOSE:To prevent an electrical problem in the insulating section of a reinforced insulator even when the front end section of the insulator is deformed by heat treatment at the time of constituting a cable connecting section by connecting cables to each other by using a premolded reinforced insulator. CONSTITUTION:At the time of constituting a cable connecting device by inserting two cables 1 and 1a into the through hole of a premolded reinforced insulator 16 and coating the outer peripheries of the cables 1 and 1a with an insulating member after confirming the continuity between the conductors 2 and 2a of the cables 1 and 1a, the end sections of the insulator 16 are coated with auxiliary insulating members 30 and 30a and the entire surface of the insulator 16 is coated with a semiconducting layer 21. Then the insulator 16 is heat-treated. Therefore, even when the end sections of the insulator 16 are rounded due to the heat treatment, the shape of the layer 21 is not changed and the electrical characteristic of the connecting section between the cable 1 and 1a is not deteriorated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable conductor connecting structure at an intermediate connecting portion of a power cable, and more particularly to a through hole to be arranged at the center of a premolded reinforced insulator which is formed in a cylindrical shape in advance. After inserting the conductor connector to be placed at the tip and connecting the cable conductor, when molding by applying heat and pressure to the reinforcing insulator,
The present invention relates to a power cable connecting portion configured so that the tip end portion of a reinforcing insulator can be prevented from rolling inward.

[0002]

2. Description of the Related Art In order to connect a large capacity power cable such as a CV cable, a slip-on type conductor connecting means has been conventionally used. Technical means such as those disclosed in Japanese Patent Laid-Open No. 2-155415 and Japanese Utility Model Laid-Open No. 2-77868 are known. In the cable connecting means as described above, the conductor connecting member made of copper is fixed to the tip end portion of the cable conductor, and the conductor connecting member attached to the tip end portions of the two cable conductors to be connected is the copper conductor joint. The cable is inserted so as to face the cable so that the cable can be conducted. Further, in the above-mentioned conventional example, each of the two conductor connectors inserted into the conductor joint is provided with locking means with the conductor joint, and the conductor connector is attached to the conductor joint. In the inserted state, the step formed inside the conductor joint and the step formed at the tip of the conductor connector are locked so that the conductor connector is prevented from coming off the conductor joint. There is. The conductor joint is formed by combining strip-shaped members into a cylindrical shape, and a spring or the like arranged on the outer periphery of the conductor joint presses and locks the conductor connector to connect the two cables. It is configured to be able to obtain continuity of.

The cable connecting portion as shown in the above-mentioned conventional example is constructed as shown in FIG. 16, for example, and the cable connecting portion 20 has two cables 1, 1.
Conductor connectors 8 and 8a are integrally provided at the tips of the conductors 2 and 2a of a, respectively. Then, the conductor connector 8,
8a is inserted into the cylindrical conductor joint 10 to form a means for setting a conductive state between the conductors via the cylindrical conductor joint. In the cable connecting portion 20, a high-voltage shield electrode 15 is arranged at a position corresponding to the cylindrical conductor joint 10 and a reinforcing insulator 16 is integrally formed in a cone shape with a predetermined length around the high-voltage shield electrode 15. To do. The reinforcing insulator 1
6 is integrally molded using a rubber / plastic material such as an uncrosslinked polyethylene resin to which a crosslinking agent is added.

In the cable connecting portion, the reinforcing insulator 1 is used.
A semiconductive layer 21 is arranged around 6, a waterproof admixture 22 is formed on the outer periphery of the semiconductive layer 21 with a predetermined thickness, and a metal protective tube 23 is arranged on the outer periphery of the waterproof admixture 22. Further, when forming an insulating connection portion with respect to the protection tube 23, the insulating tube 24 is arranged at a predetermined position, and the terminal seat 25 is arranged with respect to the protection tube 23 to provide a means for connecting to the ground. It is provided. Further, the waterproof layer 26 is arranged in a state of covering both ends of the insulating tube 24 and the connection portion with the cable sheath, and the waterproof layer 26 is constituted by a means such as winding an insulating tape, and the inside of the protective tube 23. It constitutes a means for preventing moisture and the like from entering. In addition, in the above-mentioned conventional example, the cable is provided with a corrugated exterior on the outer peripheral portion thereof, but as the cable, an arbitrary CV cable for high-voltage power transmission is targeted and the cable connecting portion is configured. be able to.

When forming the cable connecting portion as described above, the central portion of the reinforcing insulator 16 is integrally formed of a rubber / plastic material such as an uncrosslinked polyethylene resin containing a crosslinking agent. The conductor connectors 8 and 8a are inserted from both sides of the through hole provided so as to pass through.
Then, as shown in FIG. 17, the conductor joints 10 electrically connect the conductors 2 and 2a of both cables 1 and 1a to the high-voltage shield electrode 15 disposed inside the reinforcing insulator 16. , A state in which the conductor joint 10 is conducted is set. After the assembling work, a semiconductive layer 21 is formed over a predetermined length on the entire outer peripheral portion of the reinforcing insulator 16 and the surface of the insulator of the cable, and then the connecting portion is heated. A molding device for applying pressure is arranged so that the uncrosslinked polyethylene is crosslinked by applying heat and pressure, and the reinforcing insulator 16 is molded. Therefore,
After molding the reinforcing insulator by applying the above-mentioned heating and pressurizing action, the outer peripheral portion is covered as shown in FIG. 16 to configure the cable connecting portion 20.

[0006]

When heating and pressurizing the reinforcing insulator 16 as shown in FIG. 17, the reinforcing insulator 16 is treated as shown in FIG.
The tape forming the semiconductive layer 21 is wound around the tip end portion 16b having an acute angle and the surface of the cable insulator 3, or is covered with a shrink tube. However, when a heating action is applied to the tip portion of the reinforcing insulator 16, the rubber / plastic material such as polyethylene forming the reinforcing insulator is rolled up due to the release of the residual stress existing inside. The phenomenon of being lost occurs. Then, in a state where the tip end portion of the reinforcing insulator is rolled by heat, as shown in FIG.
A state occurs in which 1 is wound inside the through hole by the tip portion 16b of the reinforcing insulator. That is, when the reinforcing insulator is heated, the tip portion 16b of the reinforcing insulator is deformed into a state in which the tip portion 16b swells inward from the surface of the cable insulator at a sharp angle, and a force that causes the tip portion to round is generated, In a state where the semiconductive layer 21 coated on the outer surface of the semiconductive layer 21 is dragged, an action of winding the semiconductive layer 21 toward the inside of the through hole occurs.

When the tip portion of the reinforcing insulator is deformed as described above, the semiconducting layer is deformed, which causes a problem that the performance as the reinforcing insulator cannot be exhibited satisfactorily. There is also a possibility that the insulation performance of the connection part is greatly affected.

[0008]

It is an object of the present invention to solve the problem of forming a cable connecting portion by using the above-mentioned reinforcing insulator, and to prevent the problem that the sharp end portion of the reinforcing insulator is formed. On the other hand, by providing a member made of an auxiliary insulating material, it is possible to prevent a state in which the semiconductive layer is caught when the tip portion of the reinforcing insulator is deformed by heat, and , The semi-conductive layer is integrally formed with the reinforcing insulator, and then the tip portion is processed in advance so that the reinforcing insulator of the cable connecting portion undergoes the cross-linking process by heating and pressurizing. It is an object of the present invention to provide a connection portion for a power cable that prevents the tip portion of the body from being deformed.

[0009]

SUMMARY OF THE INVENTION According to the present invention, a conductor connector is fixed to conductor ends of two cables to be connected, and the tips of the two conductor connectors are abutted with each other to be integrally formed in advance. The present invention relates to a cable connecting part for inserting and fixing the reinforcing insulating body into a hole penetrating the center of the reinforcing insulating body to set electrical continuity between conductors of both cables. In the present invention, the conductor connector provided at the end of the cable is inserted into and fixed to the reinforcing insulator, the both ends of the reinforcing insulator and the cable are provided with an auxiliary insulating material, and the outer periphery of the reinforcing insulator is provided. Section and a peripheral part of the cable, a semiconductive layer is formed over a predetermined length, and a device for heating and pressurizing the reinforcing insulator is arranged to form a reinforcing insulator. A means for crosslinking and molding the material is used.

Further, in the present invention, the reinforcing insulator arranged at the connecting portion of the cable conductor is a tubular shape of uncrosslinked polyolefin to which a crosslinking agent is added, or a tubular shape obtained by combining members obtained by dividing a cylinder into two. The auxiliary insulating material is provided on both ends of the reinforcing insulator, and the outer peripheral portion of the reinforcing insulator is covered with a semiconductive layer to be integrally formed. After inserting the connection part of the cable conductor into the reinforcing insulator, arrange a device that heats and pressurizes the reinforcing insulator, and remove the rubber / plastic material forming the reinforcing insulator. A means for crosslinking and molding can be used.

Further, in the present invention, an auxiliary insulating material is provided on the outer peripheral portions of the tip portions on both sides of the reinforcing insulating material, and a semiconductive layer is coated on the outer peripheral portions to integrally form,
When processing the tip part in advance and molding
After inserting the molding cylindrical member into the through hole from both ends of the reinforcing insulator and performing the treatment on the tip, inserting the connecting part of the cable conductor into the reinforcing insulator, and then heating the reinforcing insulator. It is possible to use a means for arranging a device for applying pressure and for cross-linking the rubber / plastic material forming the reinforced insulator to mold the connecting portion.

[0012]

When constructing the power cable connecting portion of the present invention, the cable conductor can be connected in the same manner as in the case of constructing the conventional connecting portion, and the conductor connecting portion is connected to the reinforcing insulator. After connecting internally, an auxiliary insulating material is provided on both ends of the reinforcing insulator, and the outer peripheral surface is integrally covered with the semiconductive layer. After that, the reinforcing insulator is housed in a mold container that performs heating and pressurizing action, and the rubber / plastic material forming the reinforcing insulator is cross-linked and fused and integrated with the cable insulator. When heat and pressure are applied to the reinforcing insulator so that the tip end portion of the reinforcing insulator is rounded, the auxiliary insulating material is deformed into a state of being pulled toward the inner surface of the through hole. The shape of the semiconductive layer does not change. Therefore, since the deformation effect does not occur in the semiconductive layer at the tip of the reinforcing insulator, the electrical characteristics of the reinforcing insulator do not change.

Further, in the reinforced insulator of the present invention, it is possible to insert a cylindrical member into the through hole and pretreat the tip end portion in a state where the semiconductive layer is covered in advance. When such a treatment is performed, the tip of the reinforcing insulator is not deformed even if heat and pressure are applied after the conductor connector is inserted into the reinforcing insulator and connection is made. It is possible to prevent the layer from getting inside the tip of the reinforced insulator. Therefore,
When using a member that has been treated in advance on the tip of the reinforced insulator, work at the construction site of the cable connection can be performed easily, improving the efficiency of the work for forming the cable connection. It will be possible.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The power cable connecting portion of the present invention will be described with reference to the illustrated example. The cable connecting portion of the present invention is configured by arranging the reinforcing insulator 16 around the connecting portion of the cable conductor and applying an insulating coating process to the outer peripheral portion thereof, as in the case shown in FIG. To form the power cable connection, the cable ends are treated in the order shown in FIGS. 1 to 5 to connect the cable conductors inside the reinforced insulation and heat the reinforced insulation. Then, the compression process can be performed. First, as shown in FIG. 1, the outer tube 6 is removed from the cable 1 by a predetermined length, and the insulator 3 covering the conductor 2 is exposed by a length corresponding to the structure of the connecting portion. Then, correct the bend of the cable. Next, the insulator 3 is peeled off so that the conductor 2 is exposed by a predetermined length, and the tip end of the insulator 3 is tapered to form it as shown in FIG. The work of treating the tip portions of the cables is performed on the tip portions of the two cables to be inserted into the conductor joints, and the exposed conductor tips are positioned so as to face each other with a predetermined gap.

After treating the connection ends of the cable as shown in FIG. 2, copper conductor connectors 8 and 8a are respectively attached to the tips of the conductors 2 and 2a of the two cables as shown in FIG. Attach and fix by tightening. Then, after inserting the one conductor connector 8a into the conductor joint 10, as shown in FIG.
The conductor connector 8a is inserted into the cable 7, and the cable 1a is fixed at a position where the conductor joint 10 contacts the high-voltage shield electrode 15 of the reinforcing insulator 16. Next, as shown in FIG. 5, another cable 1 is inserted from the other of the through holes of the reinforcing insulator 16, and the conductor connector 8 is inserted into and fixed to the conductor joint 10 to fix the conductor joint 10. The electrical connection is established between the two cables via the cable. After that, a semiconductive tape or the like is wrapped around the reinforcing insulator 16 and the cable to form a semiconductive layer, and the semiconductive layer is housed in a molding container and heated and pressed. The reinforcing insulator 16 is crosslinked, and the member of the reinforcing insulator and the cable insulator are fused and integrated.

In the present invention, as shown in FIG. 5, the two cable conductors are connected inside the reinforcing insulator 16 and then heat and pressure are applied from the outer peripheral portion of the reinforcing insulator 16. A measure is taken to prevent the semiconductive layer from being caught inside the reinforcing insulator when the heat is applied. Further, the reinforced insulator used in the present invention is
As shown in the figure, it is possible to use a rubber / plastic material such as an uncrosslinked polyolefin to which a crosslinking agent is added, which is preliminarily formed into a cylindrical shape. In addition, the cylinder is divided into two parts and attached so as to sandwich the cable, and when heating and pressurizing are performed later, the joints of the two semi-cylindrical members are melted and connected. It is also possible to integrate them. When a semi-cylindrical member is used, as shown in FIG. 5, the work of positioning the cable connecting portion inside the reinforcing insulator can be performed very easily.

As described above, in order to position the reinforcing insulator on the outer peripheral portion of the cable connecting portion and to perform the treatment on the surface portion, the work is performed in the order as shown in FIGS. 6 to 8. To do. Then, the surface of the reinforcing insulator is covered with a semi-conductive tape or a semi-conductive shrink tube, and a means for disposing an auxiliary insulating material at the tip is used to connect the reinforcing insulator to the cable. Means can be taken to prevent the wound semi-conductive layer from being caught inside the reinforced insulation. FIG. 6
In the example shown in, for the outer surface of the reinforced insulator 16,
From the center part in the length direction to both sides over a predetermined section,
The semiconductive layer 21 is formed by covering with a semiconductive tape or a shrink tube. In addition, the reinforcing insulator 16
The semi-conductive layer 21 provided in the above is not placed on the tip portions of both ends, but is left in a state in which a margin portion for attaching the auxiliary insulating material later is left.

As shown in FIG. 6, the semiconductive layer 21.
By using the reinforced insulation 16 covered with, the cables are connected as shown in FIGS. 4 and 5. As shown in FIG. 7, the reinforcement insulation 16 is positioned with respect to the connection portion of the cable conductor. I do. Then, after positioning the connection portion of the cable conductor, both tip portions 16a and 16b of the reinforcing insulator 16 are covered with the auxiliary insulating materials 30 and 30a. In the example shown in FIG. 7, when the insulating material forming the reinforcing insulator is polyethylene, a polyethylene tape-like material is used as the auxiliary insulating material. As described above, by winding the tape-shaped auxiliary insulating material over both ends of the reinforcing insulator and a part of the cable conductor, the main body of the reinforcing insulator and the auxiliary insulating material are integrated in a heated state. So that the insulation characteristics at the tip of the reinforcing insulator are not affected. Further, as shown in FIG. 7, when the tip portion of the reinforcing insulator is treated, the auxiliary insulating material is applied to the both ends of the reinforcing insulator and the surfaces of the cable insulators 3 and 3a in a predetermined width. By performing the heat treatment on the reinforced insulator by performing the construction described in 1., the cable insulator is not affected even when the rubber / plastic material forming the reinforced insulator is shrunk by heat.

After attaching the auxiliary insulating material corresponding to the cable connecting portion as described above, as shown in FIG. 8, the semiconductive layer 2 previously coated on the reinforcing insulating material is used.
Semi-conducting layers 21a and 21b formed by another semi-conducting tape or shrinking tube in a state of being slightly overlapped on both end portions of No. 1 and having a predetermined width with respect to the outer peripheral portion of the reinforcing insulator and the cable conductor. Make up. As shown in FIG. 8, when the auxiliary insulating material is wound around both ends of the reinforcing insulator 16, the respective members are stacked as shown in the enlarged view on the left side of FIG. That is, the tip 1 of the reinforced insulator
The auxiliary insulating material 30a is applied in a substantially triangular shape across 6b and the insulator 3a of the cable, and the surface portion thereof is covered with the semiconductive layer 21b.

Then, in a state where the reinforcing insulator is housed in a molding container and subjected to heating and pressurizing action, as shown in FIG.
As indicated by 0, the tip portion 16b of the reinforced insulator 16 is heated, so that the tip portion 16b enters the inside of the hole. However, when the tip of the reinforcing insulator is deformed, the auxiliary insulating material 30 of the same material is used.
Since the function of entraining a is exerted, the auxiliary insulating material 30a is deformed to cover the tip of the reinforcing insulator. Therefore, even if the reinforcing insulating material and the auxiliary insulating material are deformed, the semiconductive layer 21b that covers the surroundings is not deformed, so that the electrical characteristics of the insulating material of the connection portion are affected. It will not happen.

[0021]

Second Embodiment As described above, in addition to applying the auxiliary insulating material to the tip of the reinforcing insulator to cope with the action of deformation of the tip of the reinforcing insulator, the auxiliary insulating material is used in the present invention. It is also possible to install the one integrally attached to the tip end portion to the cable connection portion. In the example shown in FIG.
Cylindrical support members 35 and 35a are respectively inserted from both ends of the through hole 17 into the reinforcing insulator 16 integrally provided with the high-voltage shield electrode 15 at the center of the through hole 17, and the supporting members are attached to both ends of the reinforcing insulator. On the other hand, the auxiliary insulating material is wound with a predetermined width or is inserted inward from the end of the reinforcing insulating material.

Then, a semiconductive member is wound around the outer peripheral portion of the reinforcing insulator and the periphery of the auxiliary insulating material, and a predetermined length from the tip of the reinforcing insulator, or a shrinkable tube is used. Is covered and heat treatment is applied to both end portions of the reinforcing insulator, so that the tip portions are deformed in the state shown in FIG. Therefore, as described above, when heat treatment is applied to the tip portions on both sides of the reinforcing insulator, even if heat and pressure are applied by arranging the reinforcing insulator at the connecting portion of the cable, The shape of the part does not change.

Further, as shown in FIG. 11, when the cylindrical support members 35 and 35a are inserted into the reinforcing insulator and preformed, the cylindrical support members are constructed in accordance with the outer diameter of the cable. Therefore, when assembling the connection portion, the work of removing the cylindrical support member and inserting the cable can be easily performed. Further, it is possible to perform the handling up to the work of forming the cable connecting portion with the cylindrical support member attached to the tip end portion of the reinforcing insulator,
It is possible to protect the tip portion having a relatively small strength, and it is possible to prevent deformation of the reinforcing insulator.

When forming a cable connecting portion by using a reinforced insulator preliminarily molded on the distal end portion, as shown in FIG. 12, first, one cylindrical supporting member is formed. The tip of the cable 1a is removed and inserted, and the high voltage shield electrode 15 is positioned. After that, the cylindrical support member 35 attached to the other end of the reinforcing insulator is removed, the other cable is inserted, and the two cable conductors are connected to each other as shown in FIG. 7 and the like. , To obtain electrical continuity.
Therefore, as shown in FIG. 11, at both ends of the reinforcing insulator 16, the auxiliary insulating material is integrated with the reinforcing insulator body at both ends of the through hole 17 to form a cylindrical support member 35.
The holes are arranged in a state of being molded in a size corresponding to the outer diameter of, and a cylindrical semi-conductive member is formed so as to project on the outside thereof.

In addition to the construction of the reinforcing insulator as shown in FIG. 11, the reinforcing insulator of the present invention, as shown in FIG. What was formed in the shape can be used. FIG. 13
In the example shown in FIG. 1, the reinforcing insulator 16 made of rubber / plastic is molded, and then heat treatment is applied to both ends of the reinforcing insulator 16, and the tip portions 16a and 16b of the reinforcing insulator are deformed by heat. By processing the tip 16
Make a and 16b acute. Then, a cylindrical support member 36, 36a is inserted into both ends of the heat-treated tip, and the surface of the reinforcing insulator 16 is covered with the semiconductive layer 21 to perform a cable connection work. Bring to the site. Therefore, at the cable connection work site, the cable connection work can be performed by removing the cylindrical support member from the reinforcing insulator and then inserting the distal end portion of the cable.

In the embodiment of the present invention, means for winding the auxiliary insulating material around the tip of the reinforcing insulator is provided to prevent the semiconductive layer from being caught inside the reinforcing insulator. There is. On the other hand, in the present invention, as shown in FIG. 14, a ring-shaped insulator 40 having a cylindrical shape can be used as an auxiliary insulator. The ring-shaped insulator 40 is made of uncrosslinked polyethylene or the like mixed with a crosslinking agent, and has an insertion portion 42 whose outer diameter is reduced toward the tip and an exposed portion 41 formed thin.
And are integrally formed via the step portion 43. The through hole provided inside the ring-shaped insulator 40 is formed corresponding to the cable conductor 3a, and has a very small gap that allows the ring-shaped insulator to slide along the conductor surface. Configure as one. The ring-shaped insulator 4
The thickness of the base portion of the insertion portion 42 is set to t so as to correspond to the stepped portion 43 of 0, and the insertion portion 42 is tapered toward the distal end portion of the insertion portion.

The ring-shaped insulator 4 constructed as described above.
0 to attach to the tip of the reinforcing insulator 16, as shown in FIG.
The insertion part 42 of the ring-shaped insulator 40 is pushed in with respect to 5. Further, even if there is a gap t between the outer peripheral portion of the cable insulator and the through hole of the reinforcing insulator, the insertion portion 42 of the ring-shaped insulator 40 is pushed into the gap,
The stepped portion 43 of the ring-shaped insulator 40 is the reinforcing insulator 16
Positioning is performed in a state where it is engaged with the tip of the member so that the gap between both members can be filled. Then, the tip end portion of the reinforcing insulator and the outer peripheral portion of the ring-shaped insulator are covered with a semiconductive tape or the like, and heat treatment is performed to integrally form the reinforcing insulator and the ring-shaped insulator. Therefore, as described above, when the ring-shaped insulator is used as the auxiliary insulator, it is possible to easily prevent the semiconductive layer from entering the inside of the hole of the reinforcing insulator, and to easily perform the mounting work. It will be possible.

In the embodiment of the present invention as described above, the sheet-like member for forming the semiconductive layer may be formed by winding a semiconductive tape member. A heat-shrinkable tubular member can be used. When a semiconductive layer is formed on the surface of the reinforced insulator by using a heat shrinkable tube, a semiconductive layer having a certain thickness can be formed on the surface of the reinforced insulator. The work of working the body can be easily performed.

[0029]

Since the power cable connecting portion of the present invention is constructed as described above, a reinforcing member integrally formed in a cylindrical shape is used to form a protective member at the cable connecting portion. Thereby, the work of forming the cable connecting portion can be easily performed. Also, after configuring the reinforced insulator, its defects and the like can be inspected at the factory,
It is not necessary to bring in inspection equipment etc. to the construction site, and it is possible to maintain good electrical performance of the connection part. Also,
When the semiconductive layer is formed on the surface of the reinforced insulator in advance, the process of construction at the site can be simplified and the construction period of the cable connection construction can be shortened. Further, in the present invention, when the heat treatment or the like is performed on the tip portion of the reinforcing insulator, it is possible to eliminate the inconvenience that the tip portion is rounded by using the auxiliary insulating material, and the electrical characteristics are improved. Can be prevented. In addition to the above effects, in the present invention, since the tip end portion of the reinforced insulator can be pre-molded in the factory, when the reinforced insulator having the tip portion subjected to heat treatment or machining is used. In addition, the performance of the reinforced insulator can be favorably maintained.

[Brief description of drawings]

FIG. 1 is an explanatory view of a molded state of a cable end portion used for a cable connecting portion of the present invention.

FIG. 2 is an explanatory diagram of a state in which a cable conductor is exposed and a tip portion of an insulator is processed.

FIG. 3 is an explanatory view showing a state in which a conductor connector is attached to the tips of the opposing cables.

FIG. 4 is an explanatory diagram showing a state in which one cable is inserted into the reinforcing insulator.

FIG. 5 is an explanatory diagram showing a state in which two cable conductors are connected in correspondence with a reinforcing insulator.

FIG. 6 is an explanatory diagram showing a state where a semiconductive layer is integrally formed with the reinforcing insulator of the present invention.

7 is an explanatory view of a state in which a conductor is connected to the reinforcing insulator of FIG. 6 and an auxiliary insulating material is covered.

FIG. 8 is an explanatory diagram showing a state in which a tip end portion of the reinforcing insulator in FIG. 7 is covered with a semiconductive layer.

FIG. 9 is an explanatory diagram of a state before heat treatment is applied to the tip end portion of the reinforcing insulator.

FIG. 10 is an explanatory diagram showing a deformed state when a heat treatment is applied to the tip end portion of the reinforcing insulator.

FIG. 11 is an explanatory view showing a reinforced insulator on which heat treatment of a tip portion and a semiconductive layer are formed.

FIG. 12 is an explanatory diagram showing a state in which a cable end portion is attached to the reinforcing insulator of FIG. 11.

FIG. 13 is an explanatory view of another embodiment of the reinforcing insulator of the present invention.

FIG. 14 is an explanatory diagram showing a structure of a ring-shaped insulator.

FIG. 15 is an explanatory diagram showing a state in which the tip portion of the reinforcing insulator is processed using the insulator of FIG.

FIG. 16 is an explanatory diagram showing a configuration of a cable connecting portion using a general reinforcing insulator.

FIG. 17 is an explanatory diagram showing a state in which a cable end portion is inserted and connected to a reinforcing insulator.

FIG. 18 is an explanatory diagram showing a state before the heat treatment of the tip portion of the reinforcing insulator.

FIG. 19 is an explanatory view showing a state after heat treatment of the tip end portion of the reinforcing insulator.

[Explanation of symbols]

1 cable, 2 cable conductors, 3 insulators, 8 conductor connectors, 10 conductor joints, 15
High-voltage shield electrode, 16 reinforced insulator, 20
Cable connection part, 21 Semi-conductive layer, 30 Auxiliary insulating material, 35/36 Cylindrical support member, 40
Ring-shaped insulator.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Juzo Shimomura 1008 Shinbori, Kumagaya-shi, Saitama Prefecture Mitsubishi Cable Industries, Ltd. Kumagaya Manufacturing Co., Ltd. (72) Shigeto Nakamura 1008 Shinbori, Kumagaya-shi, Saitama Mitsubishi Cable Industries, Ltd. Kumagaya Works (72) Inventor Iwao Otaka 1008 Shinbori, Kumagaya City, Saitama Mitsubishi Cable Industries, Ltd. Kumagaya Works

Claims (3)

[Claims] 1. A center of a reinforcing insulator which is integrally formed in advance in such a manner that a conductor connector is fixed to conductor ends of two cables to be connected and the tip ends of the two conductor connectors are butted against each other. In the cable connection part that inserts into the hole that penetrates through and is fixed, and sets electrical continuity between the conductors of both cables, insert the conductor connector provided at the cable end part into the reinforcing insulator. Fixed, by providing an auxiliary insulating material on both ends of the reinforcing insulator and the cable, forming a semiconductive layer over a predetermined length of the outer peripheral portion of the reinforcing insulator and the outer peripheral portion of the cable, A connecting portion for a power cable, characterized in that a device for heating and pressurizing an insulator is arranged and a rubber / plastic material constituting a reinforced insulator is cross-linked and molded. 2. The reinforcing insulator arranged at the connecting portion of the cable conductor is configured as a tubular member of uncrosslinked polyolefin to which a crosslinking agent is added, or a tubular member obtained by combining members obtained by dividing a cylinder into two. The auxiliary insulating material is provided on both ends of the reinforcing insulator, and the outer peripheral portion of the reinforcing insulator is covered with a semiconductive layer to be integrally formed, and the tip is preliminarily treated and molded. After inserting the connecting portion of the cable conductor into the reinforcing insulator, a device for heating and pressurizing the reinforcing insulator is arranged, and the rubber / plastic material forming the reinforcing insulator is cross-linked and molded. The connection part for electric power cables according to claim 1 characterized by things. 3. The auxiliary insulating material is provided on the outer peripheral portions of the front end portions on both sides of the reinforcing insulator, and the outer peripheral portions are covered with a semiconductive layer to be integrally formed, and the front end portions are pretreated. During molding, insert a cylindrical member for molding from both ends of the reinforced insulator into the through hole, treat the tip end, and insert the connection part of the cable conductor into the reinforced insulator. The power cable according to claim 2, wherein a device for heating and pressurizing the insulator is arranged to cross-link the rubber / plastic material forming the reinforcing insulator to mold the connecting portion. Connection.