JPH07322465A - Connector for power cable - Google Patents

Abstract

PURPOSE:To simplify the constitution of the member constituting the connection of a cable and also, facilitate the connection work when constituting the cable connection by arranging an electrode member around the junction between two cable conductors, and attaching a reinforcing insulator to the outside, and arranging an insulating cover. CONSTITUTION:Conductor connectors 30 and 30a attached to the tips of two cable conductors 2 and 2a are inserted, in butted condition, into a roughly cylindrical electrode member 50, and those are connected in a body, using locking members arranged at the tips of the conductor connectors. A projection conforming to the outline of the conductor connectors is provided at the inner face of the electrode member 50 so that space does not occur at the inner face of the electrode member. Then, a reinforcing member 45 made of polyethylene is attached in the form of covering the connection, and a processor for performing heating and pressing from outside the reinforcing member is arranged, thus bridged and softened one of polyethylene being made by giving heat and pressure to the reinforcing insulator is pressed to it, and the through hole of the reinforcing insulator is pressed against the cable and the connection, thus they can be molded integrally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for connecting a cable conductor in an intermediate connecting portion of a power cable, and more particularly to simplifying the structure of the cable connecting portion so that the connecting work can be performed quickly and the connecting work can be performed. The present invention relates to a power cable connecting device that can reduce the number of members that form a part.

[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 connected to the copper conductor joint. The cables are inserted so that they face each other 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 so that conduction between the two can be obtained.

A cable connecting portion as shown in the conventional example is constructed as shown in FIG. 26, for example, and the cable connecting portion 20 includes conductors 2 and 2a of two cables 1, 1a. Conductor connectors 8 and 8a are integrally provided at the tips. Then, the conductor connector 8, 8a
Is inserted into the cylindrical conductor joint 10 to constitute a means for setting a conductive state between the conductors through 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. . The reinforcing insulator 16
Is formed as an integral molding using a plastic material such as cross-linked polyethylene resin.

At the cable connecting portion, the reinforcing insulator 16 is used.
A shielding layer 21 is arranged around the periphery of the waterproof mixture 22, a waterproof mixture 22 is formed on the outer periphery of the shield layer 21 with a predetermined thickness, and a metal protective tube 23 is arranged on the outer periphery of the waterproof mixture 22. In addition, the protection tube 23
The insulating cylinder 24 is arranged at a predetermined position with respect to
The terminal seat 25 is arranged with respect to the protective tube, and means for connecting to the ground 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. The cable shown in the general example is configured as a corrugated exterior, but as the cable,
The cable connecting portion can be configured by targeting a CV cable or the like for arbitrary high-voltage power transmission. In the cable connecting portion 20, two conductive cylindrical members having conductivity, that is, the conductor joint 10 for connecting the conductor connector attached to the conductor of the cable and the high-voltage shield electrode 15 arranged on the reinforcing insulator 16 are copper or the like. It is configured as a cylindrical member formed of the above metal.

When forming the cable connecting portion as described above, the conductor connecting element is attached to the tip of the conductor and connected to the conductor joint in the order shown in FIGS. 27 to 31. ing. First, as shown in FIG. 27, the outer tube 6 is removed from the cable 1 by a predetermined length to expose the conductor 2 and the insulator 3 by a length corresponding to the structure of the connecting portion. Correct the cable bend. 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.

After the processing of the connecting end portions of the cable as shown in FIG. 28, as shown in FIG. 29, the conductor connecting members 8, 8a made of copper are attached to the tips of the conductors 2, 2a of the two cables.
Attach and fix each. Then, after inserting the one conductor connector 8a into the conductor joint 10, the conductor connector 8a is inserted into the through hole of the reinforcing insulator 16 as shown in FIG. The cable 1a is fixed at a position in contact with the high voltage shield electrode 15. Next, as shown in FIG. 31, 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. The electrical connection is established between the two cables via the cable. After that, the periphery of the reinforced insulator and the cable is covered with a shielding member, and the outer peripheral portion of the cable connecting portion is treated.

[0007]

DISCLOSURE OF THE INVENTION As described above,
In the case of connecting cables to form a cable connecting portion, for example, in the conventional example disclosed in Japanese Utility Model Laid-Open No. 2-77868, the connecting portion between the conductor connector and the conductor joint has a step formed on both members. Means are provided for engaging the parts. However, when a force in the pulling direction is applied to the cable, there is a problem that the connection relationship tends to become unstable. Further, in the cable connecting portion shown in the conventional example,
Since the action of expanding the conductor joint is performed when inserting the conductor connector into the conductor joint, it is necessary to provide a margin portion around the connection portion for the insertion operation of the conductor connector at the joint portion. There is a problem that the outer diameter of the reinforcing insulator is increased. In addition, since the high voltage shield electrode is integrally provided on the inner surface of the reinforcing insulator placed in the cable connection part, in order to accurately position the high voltage shield electrode inside the reinforcing insulator in the center of the conductor connector and conductor joint. It is necessary to devise.

[0008]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems in constructing a cable connection portion, and simplifies the construction of the members constituting the connection portion and facilitates the connection work. An object of the present invention is to provide a device that can reduce the working time and improve the reliability of a connection part, and to provide a connection device for a power cable that does not form an extra gap inside the connection part. In addition, a means for directly connecting the cable conductor via a conductor connector is used, and after mounting an electrode member having a function as a semi-cylindrical high-voltage shield electrode on the outside of the conductor connector, a plastic material is used. By using the method of mounting the reinforced insulator configured as described above, the number of members for forming the cable connection portion is reduced, and the power cable that can quickly perform the connection work of the cable conductor. And its object is to provide a use connection device.

[0009]

According to the present invention, a conductor connecting member made of copper is fixed at a position facing a conductor end portion of a cable to be connected, and tip portions of the two conductor connecting members are abutted to each other. A conductor joint member for making an electrical connection is arranged at the tips of the two conductor connectors, electrical conduction is obtained between the two conductors, and a reinforcing insulator is arranged on the outer periphery of the connection portion. Related to the cable connection part. In the present invention, the conductor connector attached to the end of the cable conductor is provided with a connecting means at each tip, and the conductor connector is abutted against the conductor connector so that connection is possible. A substantially cylindrical metal electrode member is arranged on the outer peripheral portion of the portion, and a reinforcing insulator is arranged to protect the outer peripheral portion along the length direction of the electrode member and the cable connecting portion. A shielding member is integrally formed around the periphery.

Further, in the present invention, the reinforcing insulator arranged around the cable conductor is formed as a cylinder of uncrosslinked polyethylene to which a crosslinking agent is added, and an outer semiconductive layer is integrally formed around the reinforcing insulator. It can be attached to the outer peripheral portion of the connecting portion by subjecting the polyethylene to cross-linking by performing heating and pressurizing treatment after positioning at the connecting portion of the cable. Further, in the present invention, the electrode member electrically connecting the two conductor connectors at the conductor connecting portion is configured as a substantially cylindrical member that also serves as a conductor joint and a high-voltage shield electrode, and The diameter is made to correspond to the outer diameter of the insulator of the cable, a ridge corresponding to the head of the conductor connector is provided at the center of the inner surface, and the electrode member is provided with respect to the two conductor connectors of the cable connector. The gap formed inside the electrode member can be reduced in the state where the electrode member is mounted. In addition to the above-mentioned configuration, in the present invention, a groove is arranged in a ring shape in the base portion that exposes the conductor at the connection end portion of the cable and is cut inward in the length direction of the cable with respect to the cut portion of the insulator. However, by inserting the end portion of the electrode member into the groove provided in the end portion of the insulator, it is possible to perform a treatment such that no gap is formed between the abutting portions of the insulator and the electrode member.

In addition to the above construction, in the present invention, the end portions of the two cable conductors are inserted and fixed from both sides of one conductor connector, and the connection portions are covered to form a semi-cylindrical shape. Two electrode members are attached, a semiconductive layer is formed on the outer peripheral portion of the electrode member, a reinforcing insulator is arranged so as to cover the outer peripheral surface of the connecting portion, and the semiconductive layer is formed on the outer peripheral portion of the reinforcing insulator. By forming a layer, the shielding member and the shielding member can be integrally configured over a predetermined range in the length direction of the cable. Further, in the present invention, the reinforcing insulator to be arranged around the cable conductor is configured as a cylinder of uncrosslinked polyethylene to which a crosslinking agent has been added, and after positioning at the connection portion of the cable, heat and pressure treatments are performed. It is also possible to arrange a means for performing the above, crosslink polyethylene by applying heat and pressure, and integrally mount the polyethylene on the outer peripheral portion of the connecting portion. Further, the electrode member disposed around the conductor connecting portion is provided by combining two semi-cylindrical members in a substantially cylindrical shape so as to cover the periphery of the conductor connecting portion, and heat shrinkable around the electrode member. Of the semi-conductive member is covered and contracted by heating, and the reinforcing insulating material is positioned and mounted around the connecting part with the semi-conductive layer as the center, and the outer side of the reinforcing insulating material is heated. It is also possible to arrange a means for applying pressure and to form the reinforcing insulator integrally with the connecting portion.

[0012]

In the case of constructing the cable connecting portion of the present invention constructed as described above, the engaging means provided at the tip end portions of the conductor connecting elements by abutting the tip end portions of two opposing conductor connecting elements. , The connection structure can be maintained accurately even if a tensile force is applied in the length direction of the cable. Further, since the electrode members arranged on the outer peripheral portions of the two conductor connectors are provided as a unitary structure by combining the conventional conductor joint and the high-voltage shield electrode,
Excessive gaps are less likely to be formed on the inner surface of the electrode member, and defects such as voids can be prevented from occurring inside the insulator of the reinforcing insulator. When forming a recessed groove into which the tip of the electrode member is inserted at the cut end of the insulator of the cable, a gap is not formed in the connecting portion with the insulator, so that the insulating effect can be improved. .

Further, the reinforcing insulator of the present invention is constructed as a cylinder of uncrosslinked polyethylene to which a cross-linking agent is added, and an external semiconductive layer is integrally provided around the reinforcing insulator to connect a cable. After positioning in the section, by applying heat and pressure to cross-link the polyethylene,
Since it can be integrated with the member arranged inside, the insulating performance of the connecting portion by the reinforcing insulator can be exhibited well. Further, since each member constituting the cable connection portion of the present invention is configured to have a simple structure, the work of creating the connection portion can be easily performed, and the cable connection work inside a narrow manhole or the like can be performed efficiently. Good and quick.

Further, in the cable connecting portion of the present invention, before connecting the cable conductors, one cable is inserted into and held by the reinforcing insulator, and the two cable conductors are inserted into the cylindrical conductor connector. To fix. After that, an electrode member is attached to the peripheral portion of the conductor connector, the periphery of the electrode member is covered with an elastic tube as an inner semiconductive layer for shielding and integrated, and the reinforcing insulator is moved around the periphery. The plastic material is cross-linked by applying heat and pressure to the reinforcing insulator and is integrated with the cable insulator to form the internal structure of the cable connecting portion. Then, after that, in the same manner as in the case of the conventional cable connecting portion, the insulating coating around the reinforcing insulator, the protective tube, and the like can be attached to complete the cable connecting portion.

In addition to the above structure, in the cable connecting portion of the present invention, the elastic tube as the shielding inner semiconductive layer can be formed by using a heat-shrinkable plastic material, and the periphery of the electrode member can be formed. After arranging the tube member on the substrate, the tube member is brought into close contact with the electrode member to exert a holding action by heating using a means such as blowing hot air. Further, the gap formed between the insulator and the electrode member is reduced by using a means for reducing the gap between the cut end of the insulator and the end of the electrode member. be able to.
Further, a groove is formed in the cut end of the insulator, and a means for engaging the end of the electrode member with the groove is used to prevent a gap from being formed between the two members. You can also

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The power cable connecting device of the present invention will be described with reference to the illustrated example. The cable connecting portion of the present invention is performed in the order shown in FIGS. 1 to 4, but in the state shown in FIG. 1, the conductor connecting elements 30 and 30a are attached to the tip end portions of the cable conductors 2 and 2a. At the stage before mounting, as shown in FIGS. 27 and 28,
The cable is straightened by straightening the conductor and exposing the conductor for a predetermined length to form stepped portions 40, 40a at the cut ends of the insulators 3, 3a, respectively. Therefore, in the embodiment of the present invention, the conductor connecting portions 30 and 30a are arranged at positions separated by a predetermined distance from the step portions 40 and 40a of the insulator without cutting the cut end portion of the insulator into a tapered shape. I am trying to attach it to. In the conductor connector of the present invention, locking members are arranged at the connection ends of the two conductor connectors as described below, and in the conductor connector 30a, the locking member is provided at the tip of the head 31a. One of them is provided so as to project.

As shown in FIG. 1, after the conductor connectors are attached to the ends of the conductors of the two opposing cables, the insulator 3a of one cable is exposed as shown in FIG. The reinforcing insulator 45 is attached to the position.
The reinforcing insulator 45 is configured as, for example, a cylinder formed of uncrosslinked polyethylene to which a crosslinking agent is added, and an outer semiconductive layer is integrally provided around the reinforcing insulator. The inner diameter of the through hole formed in the reinforcing insulator 45 is formed to have a size substantially equal to the outer diameter of the insulator of the cable, or a size with some allowance, and the reinforcing insulator is formed along the surface of the insulator. Is configured to be easily moved. Further, the reinforcing insulator 45 is formed such that both ends in the lengthwise direction thereof are tapered with respect to the large-diameter portion formed in the central portion, and like the conventional reinforcing insulator, it has a cone shape. It is configured as a member. Further, the reinforcing insulator 45 is formed by integrally coating the outer semiconductive layer 46 on the outer peripheral portion thereof, so that it is not necessary to coat the outer semiconductive layer after mounting the reinforcing insulator. To be done.

After the reinforcing insulator 45 is attached to the insulator of one cable as shown in FIG. 2, the conductor connectors 30, 30a of the two cables are attached as shown in FIG. In the state of abutting against each other, it is fixed using a locking member. Then, the electrode member 50 is attached to the outer peripheral portion of the portion to which the conductor connector is connected to set the state in which the two cable conductors are electrically connected via the electrode member. When connecting as shown in FIG. 3,
One conductor connecting member 30a is inserted into the through hole inside the electrode member 50, and then the other conductor connecting member 30 is inserted into the other through hole of the electrode member, and the other end of the conductor connecting member is opposed. The provided locking member can be engaged. Also,
When connecting the conductor connector via the electrode member shown in FIG. 3, the ring-shaped protrusion 52 formed on the inner surface of the electrode member main body 51 has a shape that substantially matches the outer shape of the head of the conductor connector. Therefore, the inner surface of the electrode member 50 and the projection 52 are engaged with the outer surface of the portion to which the conductor connector is connected without a gap, and the two cable conductors are connected to the conductor connector and the electrode member. To be conducted through.

After connecting the conductors as shown in FIG. 3, the reinforcing insulator 45 attached around one cable conductor is directed to the connecting portion as shown in FIG. Then, the reinforcing insulator is fixed in such a manner that the center portion in the length direction of the reinforcing insulator corresponds to the connection center portion of the conductor connector. As shown in FIG. 4, after positioning the reinforcing insulator with respect to the connecting portion, a heating / pressurizing device is attached to the outside of the reinforcing insulator to apply heat and pressure to the reinforcing insulator. Is added to crosslink the polyethylene reinforced insulator. By heating and pressurizing the reinforcing insulator, the polyethylene is softened to bring the inner peripheral surface of the reinforcing insulator into close contact with the outer peripheral portion of the insulator, and the conductor connector and the electrode member. Fill the surroundings, and the gap between the insulator and the electrode member with polyethylene material,
Make sure that no large gaps remain inside the connection.

In the case of forming the cable connecting portion as described above, in the present invention, the connecting structure of the conductor connecting element as shown in FIG. 5 can be used. FIG. 5
In the example shown in, the head portions 31 and 31a having a small diameter are provided at the tip portions of the conductor connectors 30 and 30a provided at the tip portions of the two cable conductors 2 and 2a. The recessed portions 32 and 32a are formed by screwing inward, and the insertion side connecting member 33 and the locking side connecting member 36 are provided by being screwed respectively. The insertion side connection member 33 attached to the head of the conductor connector 30a is provided with a projecting member 34 from a main body provided with a threaded portion, and a plurality of locking members capable of projecting and retracting to the side with respect to the projecting member 34. 35 are provided. The locking member 35 is swingably provided in a projecting direction by a biasing member such as a spring provided on the projecting member 34.

Further, the conductor connector 30 arranged so as to face the conductor connector 30a is mounted by screwing an insertion side connection member 33 into a recess 32 formed inside the head 31. The engaging side connecting member 36 has a recess 3 inside.
7 is provided, and a small-diameter locking step 38 is formed at the tip of the recess 37. And two conductor connectors 30,
When 30a is abutted, the engaging side connecting member 36
The protruding member 34 enters the concave portion 37 of the
With 4 in the recess, the locking member 35 is expanded inside the recess, and the locking member 35 is locked by the locking step portion 38 of the locking side connecting member. Therefore, when the insertion side connecting member 33 is locked to the locking side connecting member 36,
It becomes possible to oppose the pulling force of the cable of the book.

[0022]

[Embodiment 2] As shown in FIGS. 1 to 4, when connecting two cables, a step is formed at the cut end of the insulator, and a predetermined step is formed from the step of the insulator. When the conductor connector is attached through the gap, a large gap is created between the end of the electrode member and the step of the insulator. Therefore, in the present invention, as shown in FIG. 6, the ring-shaped recessed groove 41a is formed in the cut end surface of the insulator. After that, as shown in FIG. 7, the conductor connector 30a is fixed to the tip of the conductor, and the insertion-side connector 33 as a locking member is attached to the head 31a of the conductor connector. . Similarly, a conductor connector provided with a locking-side connecting member is attached to the tip of another conductor facing the conductor. After the conductor connectors are attached to the ends of the conductors as described above, as shown in FIG.
The two conductor connectors 30 and 30a are inserted into the electrode member 50 in a state of facing each other, the cable conductors are connected to each other by using the locking member, and the conductive state using the electrode member 50 is set. Further, as shown in FIG. 8, when the electrode member 50 is attached, the end portions 53, 53a on both sides of the electrode member are recessed grooves 41, 41a formed on the cut end faces of the insulators 3, 3a. Since it is engaged in the state of being inserted in,
No gap is left between the both ends of the electrode member and the insulator.

Before the conductor connector is directly connected as shown in FIG. 8, the reinforcing insulator 4 is connected to one of the cables.
After attaching 5 and connecting the two cable conductors via the electrode member, the reinforcing insulator 45 is positioned in a state of covering the electrode member as shown in FIG. And
As in the case of FIG. 4, a heating / pressurizing device is attached to the outside of the reinforcing insulator 45, and heat and pressure are applied to the reinforcing insulator to crosslink the reinforcing insulator made of polyethylene. . By heating and pressurizing the reinforcing insulator, the polyethylene is softened to bring the inner peripheral surface of the reinforcing insulator into close contact with the outer peripheral portion of the insulator, and the conductor connector and the electrode member. A polyethylene material is used to fill the surroundings, the gap between the insulator and the electrode member, and the like so that no large gap remains inside the connection part.
In particular, by mounting the end of the electrode member so that it enters the groove provided in the end of the insulator,
When the reinforced insulator is compressed and molded, it is possible to set a good insulation state without forming a large gap inside the cable connection portion.

In the embodiment of the present invention, the outer semiconductive layer 46 is integrally formed around the reinforcing insulator.
When a heating / pressurizing action is applied to the reinforced insulator, it is transformed into a shape that matches the outer shape of the reinforced insulator, so the outer periphery of the reinforced insulator should be covered with an external semiconductive layer. Will be possible. Therefore, when the reinforcing insulator is integrally molded, the work of integrally forming the outer semiconductive layer 46 on the outer semiconductive layer provided on the insulator of the cable can be easily performed. By arranging other coating members around the periphery, it is possible to simplify the work of constructing the reinforced insulator as shown in FIG. Further, in the cable connecting portion of the present invention, the material forming the reinforcing insulator can be made of one having arbitrary insulating characteristics, and by applying heat and pressure, a gap is formed inside the connecting portion. Other plastic materials can be used as long as they can be prevented.

[0025]

[Embodiment 3] In addition to the above-mentioned embodiment, in the power cable connecting device of the present invention, it is also possible to configure a connecting portion as shown below. The examples shown in FIGS. 10 to 14 connect the cable conductors when forming the cable connection portion of the present invention, and integrate the conductor joint and the high voltage shield electrode around the connection portion to form a high voltage shield electrode. The description will be given in the order of the operation of disposing the electrode member having the function of, and mounting and fixing the reinforcing insulator. In the example shown in FIG. 10, the conductor 2 is formed after straightening the cable by correcting the bending of the cable as shown in FIG.
It shows a state in which the tip portion of a is exposed by a predetermined length and a step portion 60 is formed at the cut end portion of the insulator 3a. After the end portion of the insulator 3a is processed as described above, the cable is inserted into the internal through hole of the reinforcing insulator 45 to hold the reinforcing insulator 45 as shown in FIG.
When the end portion of the cable conductor is treated as shown in FIG. 10, the same treatment is applied to the other cable to be connected, but the reinforcing insulator is attached to one of the two cables. .

After the cable is treated as described above, the two cable conductors 2 and 2a are inserted into the conductor connector 65 as shown in FIG. Is fixed to the conductor connector so that the conductor is electrically connected through the conductor connector.
After that, as shown in FIG. 13, a semi-cylindrical electrode member 66 is attached and fixed to the outside of the conductor connector. Then, by moving the reinforcing insulator 45 supported by one of the cables with respect to the conductor connecting portion, positioning is performed as shown in FIG. 14, and a device for heating and pressurizing the outside of the reinforcing insulator is provided. It is attached so that the reinforcing insulator is heated and pressed to crosslink the plastic material forming the reinforcing insulator, and is pressed inward to be fixedly held. Further, the reinforcing insulator 45
For this, it is possible to use a cylinder formed of an uncrosslinked polyethylene to which a crosslinking agent is added, and an external semiconductive layer integrally provided around the reinforcing insulator.

In fixing the structural member disposed inside the cable connecting portion through the steps shown in FIGS. 10 to 14, the conductor connector 6 is used in the present invention.
5 is made of a material having good conductivity such as copper or a copper alloy to fix the cable conductor and to set good conductivity between two connected cable conductors. Also,
As the electrode member 66 arranged on the outer side of the conductor connector, as shown in FIG. 16, by mounting an electrode piece configured in a semi-cylindrical shape using a metal material such as aluminum,
The circumference of the conductor connector can be covered.
Then, after positioning the cable at the connection portion, it is possible to integrate it with the member to be placed inside by subjecting the polyethylene to crosslinking by subjecting it to heating and pressurization, and the reinforcing effect of the connection portion by the reinforcing insulator is improved. It is possible to demonstrate.

When the cable connecting portion is formed by following the procedure described above, after the electrode member is mounted as shown in FIG. 13, the steps shown in FIG. , Providing a step of mounting the elastic tube 70,
While holding the two electrode pieces 67, 67a fixed,
The work of forming the internal semiconductive layer on the outer peripheral portion of the electrode member is performed. In the example shown in FIG. 15, the elastic tube 70 supported by the holding cylinder 72 is held by the other cable in parallel with the operation of mounting the reinforcing insulator on one cable in the step of FIG. Aside
The elastic tube 70 is mounted as shown in FIGS. As shown in FIG. 17, the elastic tube 70 is held in a holding cylinder 72 made of a rigid body such as metal, and the elastic tube 70 is pulled out from the holding cylinder 72 so that the elastic tube 70 is held on the outer periphery of the electrode member 66. It is configured so that it can be attached to the part.

The holding cylinder 72 for holding the elastic tube 70 is made of a metal or a plastic material as a cylindrical member.
By combining semi-cylindrical members that are split into pieces, it is possible to easily perform the work of disconnecting from the cable. Even when forming a cylinder and attaching an elastic tube, the combination of the cylinders This can be dealt with only by providing a simple locking means on the part. As the elastic tube 70, for example, an elastic body containing rubber as a main component is used, and the elastic tube 70 is formed in a shape matching the outer shape of the electrode member, and the elastic tube is expanded with respect to the holding cylinder 72. It can be supported. Apart from the elastic tube, as shown in FIG. 16, in the electrode member 66 formed in a split shape, a convex portion 68 is provided on the inner surface of the electrode member 66 at a position corresponding to the conductor connector. By pressing and fixing 68 around the conductor connector, it is configured as a member capable of acting as the conductor joint and the high-voltage shield electrode in the conventional cable connecting portion.

As shown in FIG. 15, with respect to the conductor connector 65 which connects two cable conductors, the electrode member 6 which is arranged over the outer peripheral portion and the step portion of the connecting portion of the insulator.
After mounting 6, the elastic tube 70 is mounted as shown in FIGS. 18 to 20. In the example shown in FIG. 18, the holding cylinder 72 that holds the elastic tube 70 is moved so as to be centered on the connection portion, and the position where the elastic tube is mounted is set. Next, as shown in FIG. 19, one end portion 71a of the elastic tube 70 is positioned, the holding cylinder 72 is moved toward the cable conductor 2, and the holding cylinder is pulled out from the elastic tube. The both sides of the elastic tube 70 are formed with arcuate portions conforming to the end shape of the electrode member, and the elastic tube has elasticity so that the elastic tube previously extracted from the holding cylinder is Since the end portion 71a is curved according to the shape of the end portion of the electrode member, the portion removed from the holding cylinder comes into close contact with the surface of the electrode member. Then, as described above, by performing the work of extracting the holding cylinder, when the holding cylinder is completely disconnected from the connecting portion, the outer peripheral portion of the electrode member is covered with the elastic tube 70 as shown in FIG. A semiconductive layer may be integrally formed on the outside of the member.

In the examples shown in FIG. 15 and subsequent figures, the elastic tube is made to match the outer shape of the electrode member in advance, but the member constituting the semiconductive layer of the present invention is made of a heat-shrinkable material. Can also be configured. In the example shown in FIG. 21, a tube member 7 made of a material having heat shrinkability and semiconductivity is used as a member forming the semiconductive layer.
5 is used, and the tube member 75 is held to the other cable at the stage shown in FIG. Then, after connecting the cable conductors, the electrode member 66 is mounted, after that, the tube member 75 is positioned outside the electrode member 66, and then, as shown in FIG. Shrink the end of
The contraction portion 76 is formed and fixed to the end portion of the electrode member 66.
Next, by blowing hot air in the length direction of the tube member, the tube member 75 is sequentially shrunk in the length direction of the electrode member, and as shown in FIG. And the two electrode pieces are fixedly held by the tube member. As described above, after fixing the tube member around the electrode member in a wound state, the reinforcing insulator 45 is moved with respect to the connecting portion, and the reinforcing insulator is heated and pressed to crosslink the reinforcing insulator. Complete the internal structure of the cable connection.

When using the method for forming a cable connection portion of the present invention, in order to prevent a gap from being formed between the cut end portion of the insulator and the end portion of the electrode member, the cut end portion of the insulator is Instead of forming the stepped portion with respect to the portion, as shown in FIG. 24, the concave groove 61 can be formed. In the example shown in FIG. 24, the ring-shaped groove 61 is formed in a state where the cable conductor is exposed by a predetermined length and then cut in the length direction of the cable from the cut end of the insulator. The groove 61 is formed in conformity with the shape of the end portion of the electrode member. As shown in FIG.
a is connected using a conductor connector 65, and the electrode member 66 is arranged and attached to the outer peripheral portion of the electrode member 66.
It is possible to prevent the formation of a gap between the insulator and the electrode member by engaging both end portions of the concave groove formed in the insulator. Then, as shown in FIG. 25, after the electrode member is attached to the cable connecting portion, an elastic tube or a tube member is attached to the outer peripheral portion thereof to fix and hold the electrode member, and the inner half of the cable connecting portion. By forming the conductive layer, it is possible to deal with the work of mounting the reinforcing insulator.

In the cable connecting portion of the present invention constructed as described above, the material forming the reinforcing insulator is made of uncrosslinked polyethylene, and other materials having the same properties as the above-mentioned materials are used. It is also possible to configure using. Then, after positioning the reinforcing insulator with respect to the cable connecting portion, heat and pressure are applied to soften the reinforcing insulating body and pressed around the cable insulating body and around the connecting portion,
Complete the connection. Furthermore, when compression-molding the reinforced insulator, the softened plastic material can invade the gap between the electrode member and the insulator to eliminate the gap, preventing the formation of voids inside the insulator of the connection part. It becomes possible to do. Apart from the reinforcing insulator, the elastic tube 70 or the tube member 75 arranged on the outer surface of the electrode member is
It may be made of a polymer material having any semiconductivity.

[0034]

Since the power cable connecting device of the present invention is constructed as described above, when the cable connecting portion is formed, the tips of the two opposing conductor connectors are butted. With this, the locking means provided at the tip of the conductor connector is connected, so that the connection structure can be accurately maintained even if a pulling force is applied in the length direction of the cable. Further, since the electrode members arranged on the outer circumferences of the two conductor connectors are provided as a unitary combination of the conventional conductor joint and the high-voltage shield electrode, the size and weight can be reduced, the assembling is easy, and the high-voltage shield is easy. An internal semiconducting layer on the electrodes can be applied beforehand. When forming a groove into which the tip of the reinforcing insulator is inserted at the cut end of the insulator of the cable, a gap is not formed in the connecting portion with the insulator, so that the insulating effect can be improved. it can.

Further, the reinforcing insulator of the present invention is constructed as a cylinder of uncrosslinked polyethylene to which a cross-linking agent is added, and an external semiconductive layer is integrally provided around the reinforcing insulator to connect cables. After positioning in the section, by applying heat and pressure to cross-link the polyethylene,
Since it can be integrated with the member arranged inside, the insulating performance of the connecting portion by the reinforcing insulator can be exhibited well. Further, since each member constituting the cable connection portion of the present invention is configured to have a simple structure, the work of creating the connection portion can be easily performed, and the cable connection work inside a narrow manhole or the like can be performed efficiently. Good and quick.

In addition to the above effects, the power cable connecting device of the present invention can perform conductor connecting work without moving the connecting portion of the cable excessively.
And since the members that have been conventionally used for cable connection can be used as they are, and the conductors are connected after the reinforcing insulator and elastic tube are held in the cable, it is the same as the conventional prefabricated connection construction. The cable connection portion can be configured according to various steps. Further, the reinforcing insulator of the present invention uses a block member made of an uncrosslinked plastic material, and since no high-voltage shield electrode or the like is arranged inside thereof, the structure of the reinforcing insulator can be simplified, and the reinforcing insulator It is possible to reduce the manufacturing cost. Further, in the cable connecting portion of the present invention, since the outer diameter of the electrode member is formed so as not to exceed the outer diameter of the insulator of the cable conductor, it is possible to configure the reinforcing insulator as a thin cable. It is also possible to reduce the outer diameter of the connection portion. Then, since the inner semiconductive layer integrated with the electrode member is formed on the inner surface of the reinforcing insulator and the heating and pressing processes are performed after the reinforcing insulator is mounted, a gap or the like may occur inside the reinforcing insulator. Can be prevented and the reliability of the cable connecting portion can be improved.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a state in which a conductor connector is attached to a tip portion of a cable conductor of the present invention.

FIG. 2 is an explanatory diagram showing a state where a reinforcing insulator is attached to one cable.

FIG. 3 is an explanatory diagram showing a state in which two conductor connectors are connected via an electrode member.

FIG. 4 is an explanatory view showing a state in which a reinforcing insulator is attached to the connecting portion and the connecting portion is molded.

FIG. 5 is an explanatory diagram showing a configuration of a locking means used in the present invention.

FIG. 6 is an explanatory diagram of a case where a groove is formed on a cut side surface of an insulator of a cable.

FIG. 7 is an explanatory view showing a state in which a conductor connector is attached to the tip end portion of the cable conductor of FIG.

FIG. 8 is an explanatory diagram showing a state in which two conductor connectors formed as shown in FIG. 7 are connected.

9 is an explanatory view showing a state in which a reinforcing insulator is attached to the connection portion of FIG. 8 and a molding process is performed.

FIG. 10 is an explanatory view showing a molded state of the end portion of the cable in the cable connection of the present invention.

FIG. 11 is an explanatory diagram showing a state in which a reinforcing insulator is attached to one cable.

FIG. 12 is an explanatory diagram showing a state in which two conductors are opposed to each other and attached to a conductor connector.

FIG. 13 is an explanatory diagram showing a state in which electrode members are attached so as to correspond to conductor connectors.

FIG. 14 is an explanatory diagram showing a state in which a reinforcing insulator is attached in correspondence with an electrode member.

FIG. 15 is an explanatory diagram showing the state of FIG. 13 in detail.

FIG. 16 is an exploded perspective view of an electrode member used in the present invention.

FIG. 17 is an explanatory diagram of an elastic tube of the present invention.

FIG. 18 is an explanatory diagram showing a state in which the elastic tube is positioned with respect to the connection portion.

FIG. 19 is an explanatory view showing a state where the end portion of the elastic tube is positioned with respect to the electrode member.

FIG. 20 is an explanatory diagram showing a state in which the elastic tube is completely attached.

FIG. 21 is an explanatory diagram of a case where a tube member is used instead of the elastic tube.

FIG. 22 is an explanatory view showing a state where the end portion of the tube member is contracted and fixed.

FIG. 23 is an explanatory diagram showing a state in which the tube member is fixed to the electrode member.

FIG. 24 is an explanatory diagram showing a case where a groove is formed in a cut end portion of an insulator.

FIG. 25 is an explanatory diagram showing a state in which an electrode member is attached through a groove provided in an insulator.

FIG. 26 is an explanatory diagram showing a configuration of a general cable connecting portion.

FIG. 27 is an explanatory diagram showing a first step of processing when connecting a conventional cable.

FIG. 28 is an explanatory diagram showing a process of shaving the cutting tip portion of the insulator.

FIG. 29 is an explanatory diagram showing a state in which a conductor connector is attached to the tip of the conductor.

FIG. 30 is an explanatory diagram showing a state in which one conductor connector is inserted into the reinforcing insulator.

FIG. 31 is an explanatory diagram showing a state in which two conductor connectors are connected to each other inside a reinforcing insulator in a state of being butted.

[Explanation of symbols]

1 cable, 2 conductors, 3 insulators, 8
Conductor connector, 10 conductor joint, 15 high-voltage shield electrode, 16 reinforced insulator, 20 cable connection part, 30 conductor connector, 33 insertion side connection member, 36 locking side connection member, 40 step part, 41
Groove, 45 reinforced insulator, 50 electrode member, 66 electrode member, 67 electrode piece, 70
Elastic tube, 72 holding cylinder, 75 tube member.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shigeto Nakamura 1008 Shinbori, Kumagaya-shi, Saitama Mitsubishi Cable Industries, Ltd. Kumagaya Manufacturing Co., Ltd. (72) Iwa Otaka 1008 Shinbori, Kumagaya-shi, Saitama Mitsubishi Cable Industries, Ltd. Kumagaya Plant (72) Inventor Hirohisa Kamigami 1008 Shinbori, Kumagaya City, Saitama Prefecture Mitsubishi Cable Industries, Ltd.Kumagaya Plant

Claims (7)

[Claims] 1. A front end of two conductor connectors in a state where a copper conductor connector is fixed at a position facing a conductor end of a cable to be connected and the front ends of the two conductor connectors are butted against each other. A conductor coupling member for making an electrical connection at a portion to obtain electrical continuity between the conductors, and a reinforcing insulating body disposed at an outer peripheral portion of the connection portion, wherein the cable conductor A connecting means is provided at each tip of the conductor connector attached to the end of the conductor connector so that the conductor connector can be connected by abutting the conductor connector. -Shaped metal electrode member is arranged, a reinforcing insulator for protecting the outer peripheral portion along the length direction of the electrode member and the cable connecting portion is arranged, and a shielding member is integrally formed around the reinforcing insulator. Power supply characterized by Connection device for cables. 2. The reinforcing insulator arranged around the cable conductor is formed as a cylinder of uncrosslinked polyethylene to which a crosslinking agent is added, and an external semiconductive layer is integrally provided around the reinforcing insulator. The power cable according to claim 1, wherein after the positioning at the connection portion of the cable, heating and pressurization treatment is performed to crosslink the polyethylene, and the polyethylene is attached integrally to the outer peripheral portion of the connection portion. Connection device. 3. An electrode member for electrically connecting two conductor connectors at the conductor connecting portion is configured as a substantially cylindrical member that also serves as a conductor joint and a high voltage shield electrode, and the outer diameter of the electrode member is It is configured to correspond to the outer diameter of the insulator of the cable, a ridge corresponding to the head of the conductor connector is provided in the center of the inner surface, and the electrode member is attached to the two conductor connectors of the cable connector. The connection device for a power cable according to claim 1, wherein the gap formed inside the electrode member is reduced in this state. 4. A base for exposing a conductor at a connection end of a cable, wherein a groove is arranged in a ring shape in a state of being cut inward in the lengthwise direction of the cable with respect to a cut portion of the insulator. 4. The process of inserting the end portion of the electrode member into the groove provided at the end portion so that a gap is not formed between the abutting portion of the insulator and the electrode member. Power cable connection device. 5. An electrode member is attached so as to be opposed to a conductor end portion of a cable to be connected and fixed by using a conductor connector, and to cover a connected portion in a state where tip ends of the two conductor connectors are abutted to each other. , A cable connecting portion in which electrical continuity is obtained between the conductors and a reinforcing insulator is arranged on an outer peripheral portion of the connecting portion, the end portions of the two cable conductors being provided on both sides of one conductor connecting element. The two semi-cylindrical electrode members are attached so as to cover the connecting portion, the semi-conductive layer is formed on the outer peripheral portion of the electrode member, and the outer peripheral surface of the connecting portion is covered. And disposing the reinforcing insulator, forming a semiconductive layer on the outer peripheral portion of the reinforcing insulator, and integrally configuring the protective member over the predetermined range in the longitudinal direction of the reinforcing insulator and the cable. Power cable characterized by Connection device. 6. The reinforcing insulator arranged around the cable conductor is formed as a cylinder of uncrosslinked polyethylene containing a crosslinking agent, and is heated and pressed after being positioned at the connecting portion of the cable. The connecting device for a power cable according to claim 5, wherein the means is arranged, the polyethylene is crosslinked by applying heat and pressure, and the polyethylene is attached integrally to the outer peripheral portion of the connecting portion. 7. The electrode member arranged around the conductor connecting portion is provided by combining two semi-cylindrical members so as to cover the periphery of the conductor connecting portion in a cylindrical shape, and heat is provided around the electrode member. A shrinkable semi-conductive member is covered and shrunk by heating, and a reinforcing insulating material is positioned and mounted around the connecting portion with the semi-conductive layer as a center, and is attached to the outside of the reinforcing insulating material. The power cable connecting device according to claim 5, wherein means for heating and pressurizing are arranged and the reinforcing insulator is integrally formed with the connecting portion.