JP2001352655A - Joint for connecting cables of different kinds to each other, and its assembling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the axial length of a joint smaller, and moreover to facilitate its assembling work and confirmation work of sealability. SOLUTION: An outward projection 11 for fixing a conductor connector element 5 to a reinforcing insulator 6 is composed of fixing metal fixtures 29, which are bodies different from this connector element 5. By performing CV cable 1 side connecting work before fitting these fixtures 29, the need for causing the insulator 6 and a premolded insulator 21 to retreat is reduced, to shorten the length. Besides, assembling work on OF cable 2 side to be performed with the insulator 6 brought near to CV cable 1 side is made possible to facilitate assembling work. Moreover, confirmation work of the sealability is facilitated by enabling assembling of a protective cover 16 on OF cable 2 side, prior to the fitting work of the premolded insulator 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a connection portion between different types of cables and a method of assembling the connection portion, wherein an end portion of an oil-filled cable (hereinafter, referred to as an "OF cable") used as an underground power transmission line. The present invention relates to a prefabricated connecting portion for connecting an end portion of a crosslinked polyethylene insulated cable (referred to as “CV cable” in the present specification) and an improved method of assembling the connecting portion.

[0002]

2. Description of the Related Art OF cables and CV cables have conventionally been used as typical power cables for constituting underground power transmission lines. Of these cables, the OF cable is filled with insulating oil under pressure by pressurizing the inside of a hollow conductor, and impregnated with oil oozing from the outer peripheral surface of an oil-impregnated paper wound around the conductor. The purpose of this is to achieve insulation.
Further, an electric field alleviating structure provided by filling the above-mentioned oil is provided at a connection portion with another cable provided at an end portion of such an OF cable to ensure insulation of the connection portion. On the other hand, the CV cable insulates the conductor by covering the conductor with an insulating layer made of cross-linked polyethylene. Also, provided at the end of such a CV cable,
An electric field relaxation structure is provided in a connection portion with another cable by pressing a pre-molded insulator made of rubber or the like, thereby ensuring insulation of the connection portion.

[0003] Of the above-mentioned OF cable and CV cable, the OF cable can maintain excellent insulation performance even in a humid environment for a long period of time, but it is troublesome to maintain and increases the running cost. Inevitable. For this reason, in recent years, the conversion from the OF cable to the CV cable has been sequentially attempted in factories and substations. For this reason, it is necessary to connect the end of the OF cable and the end of the CV cable, which are different types of cables, to each other. Such a structure of a connecting portion between different kinds of cables for connecting the end of the OF cable and the end of the CV cable to each other.
An example will be described with reference to FIG. 1 showing an example of an embodiment of the present invention.

At the ends of the conductors 3a and 3b constituting the CV cable 1 and the OF cable 2 to be connected to each other, portions exposed from the insulating layers 4a and 4b, respectively, are inserted into the conductor connectors 5 to form the conductor connection The child 5 is inserted from both ends of the opening. The insulating layer 4a constituting the CV cable 1
Is a cross-linked polyethylene, and the insulating layer 4b constituting the OF cable 2 is an oil-immersed paper. The conductor connector 5 includes:
It is made of a relatively soft metal having a low electric resistance, such as a copper-based alloy, and has substantially cylindrical ends at both ends. Such a conductor connector 5 is configured such that the ends of the conductors 3a and 3b are inserted from the openings at both ends thereof, and the conductors 3a and 3b are
b and crimped toward the outer peripheral surface of the
The ends of “a” and “3b” are connected via the conductor connector 5.

[0005] The conductor connector 5 is embedded and supported on the inner peripheral surface of a cylindrical reinforcing insulator 6, and the inner peripheral surface of a cylindrical high-voltage shield electrode 7 made of a metal such as an aluminum alloy. It is fixedly supported. In order to support and fix the conductor connector 5 inside the high-voltage shield electrode 7 as described above, conventionally, it has been considered to use a conductor connector 5a as shown in FIGS. The conductor connector 5a shown in FIGS.
Are cylindrical compression terminal portions 25, 25 with bottoms at both ends in the axial direction.
And a coupling column 9 at an axially intermediate portion. In addition, locking grooves 10 and 10 for locking the O-ring are provided on the outer peripheral surface of the intermediate portion of the connecting column portion 9, and an outward flange-shaped outer peripheral surface is provided on one end (the left end in FIG. 7). An outwardly projecting portion 11 is provided on the outer peripheral surface of the other end portion (the right end portion in FIG.
2 are formed respectively. On the other hand, on the inner peripheral surface of the intermediate portion of the high-voltage shield electrode 7, an inward flange-shaped inward convex portion 13 is provided over the entire circumference so as to protrude radially inward. The inner peripheral surface of the inward projection 13 is a smooth cylindrical surface. The inner diameter of the inward projection 13 is smaller than the outer diameter of the outward projection 11 and the outer diameter of the holding nut 14 described below.

When the conductor connector 5 (5a) is fitted inside the high-voltage shield electrode 7 on which the inwardly protruding portion 13 is formed as described above, the male screw portion 12 is restrained as shown in FIG. The nut 14 is screwed in, and the inward projection 13 is sandwiched between the holding nut 14 and the outward projection 11 from both sides in the axial direction, thereby fixing the inside of the high-voltage shield electrode 7. In this state, O-rings made of oil-resistant rubber, which are mounted in the respective locking grooves 10 and 10, respectively,
A seal is provided between the outer peripheral surface of the intermediate portion of the conductor connector 5 (5a) and the inner peripheral surface of the intermediate portion of the high-voltage shield electrode 7.

As described above, with the conductor connector 5 (5a) supported and fixed inside the high-voltage shield electrode 7, one end (left end in FIG. 1) opening of the reinforcing insulator 6 and the OF cable 2 A protective cover 16 is provided between the outermost protective layer 15b and the one end of the reinforcing insulator 6 and the outer peripheral surface of the OF cable 2 in an oil-tight manner. And
The oil supply plug 17 provided in a part of the protective cover 16 allows the space 18 existing inside the protective cover 16 to be filled with the insulating oil under pressure. The oil pressurized and filled in the space 18 enters the hole provided at the center of the conductor 3b constituting the OF cable 2 and spreads over the entire length of the conductor 3b. For this purpose, an oil passage hole 19 is provided in the middle part of the conductor connector 5 (5a) to connect the end of the conductor 3b. This oil hole 1
One end of 9 is opened at the outer peripheral surface of the intermediate portion of the conductor connector 5 (5a), and the other end is opened at the center of the inner surface of the circular recess 20 into which the end of the conductor 3b is inserted.

On the other hand, the pre-molded insulator 21 is placed in a space between the inner peripheral surface of the other end (the right end in FIG. 1) of the reinforcing insulator 6 and the outer peripheral surface of the insulating layer 4a of the CV cable 1. Push it in to block this space. The pre-molded insulator 21 is pushed into the space by a pressing sleeve 23 provided with an elastic force in the axial direction by a spring 22, and bites into the space in a wedge shape. The periphery of the spring 22 and the pressing sleeve 23 is also covered by the second protective cover 24.

As described above, it is important to seal between the connection portion of the CV cable 1 and the connection portion of the OF cable 2 from the viewpoint of ensuring the insulating properties of these two connection portions. That is, the OF is filled in the protective cover 16 and the OF
When oil for insulating the connection portion of the cable 2 leaks to the connection portion side of the CV cable 1, the protection cover 16
There is a possibility that the hydraulic pressure in the interior of the cable decreases and the insulation of the OF cable 2 is significantly deteriorated. In addition, the oil that has entered the connection portion of the CV cable 1 becomes a foreign substance on the connection portion side of the CV cable 1, and the CV cable 1
May degrade the insulation of the connection part. Because of this,
It is important to ensure the sealing performance between the pair of connecting portions of the cables 1 and 2.

Conventionally, the operation of assembling the connection portion between different kinds of cables having the above-described configuration has been performed as shown in FIGS. 9 to 10 or FIGS. First, FIGS.
In the case of the method of the first example shown in FIG. 0, first, as shown in FIG. 9, the pre-molded insulator 21, the holding nut 14, and the reinforcing insulator 6 are formed on the insulating layer 4a of the CV cable 1. 9 and the end of the conductor 3a of the CV cable 1 and one end of the conductor connector 5a (FIGS. 9 to 10).
To the right end). In this operation, the end of the conductor 3a is inserted into the circular concave portion 20 of the bottomed cylindrical compression terminal 25 provided at one end of the conductor connector 5a, and the compression terminal 25 is compressed by the compressor 26. Diameter, this circular recess 20
Of the conductor 3a is pressed against the outer peripheral surface of the end of the conductor 3a. Thus, the conductor 3 of the CV cable 1
a and the one end of the conductor connector 5a, then, as shown in FIG.
9 and the other end of the conductor connector 5a (FIG. 9).
10 to the left end) by the same operation.

In this way, if the end of the conductor 3a of the CV cable 1 and the end of the conductor 3b of the OF cable 2 are connected via the conductor connector 5a, the reinforcing insulator 6 Is moved to the left from the state of FIG. Then, one side surface (the left side surface in FIGS. 9 to 10) of the inward convex portion 13 formed in the middle portion of the inner peripheral surface of the high-voltage shield electrode 7 embedded in the inner peripheral surface of the reinforcing insulator 6 and the conductor connector 5a, one side surface of the outward convex portion 11 formed on the outer peripheral surface of the intermediate portion (FIGS. 9 to 1).
0 right side). And in this state,
The holding nut 14 is screwed and tightened to the male screw portion 12 formed on the outer peripheral surface of the intermediate portion of the conductor connector 5a, and the conductor connector 5a is fixed inside the reinforcing insulator 6.

After the conductor connector 5a is fixed inside the reinforcing insulator 6, the pre-mold insulator 21, the spring 22, and the second protective cover 24 (see FIG. 1) are provided on the CV cable 1 side. ) And the like are attached to the OF cable 2 side with the protective cover 16 (see FIG. 1) and the like, and the assembling work of the connection portion between the different kinds of cables is completed.

Next, in the case of the method of the second example shown in FIGS. 11 to 13, first, as shown in FIG.
In a state where the reinforcing insulator 6 and the holding nut 14 are externally fitted to the insulating layer 4b, the end of the conductor 3b of the OF cable 2 and the other end of the conductor connector 5a (FIGS. 11 to 11).
13 left end). Next, as shown in FIG. 12, in a state where the pre-molded insulator 21 is externally fitted to the insulating layer 4a constituting the CV cable 1, the end of the conductor 3a of the CV cable 1 and the conductor connector 5a are connected. One end (right end in FIGS. 11 to 13) is connected.

In this way, if the end of the conductor 3a of the CV cable 1 and the end of the conductor 3b of the OF cable 2 are connected via the conductor connector 5a, the reinforcing insulator 6 12 is moved to the right from the state shown in FIG. 12, and as shown in FIG. 13, the retaining nut 14 is screwed and tightened to the male screw portion 12 formed on the outer peripheral surface of the intermediate portion of the conductor connector 5a. The conductor connector 5 a is fixed inside the reinforcing insulator 6. After the conductor connector 5a is fixed inside the reinforcing insulator 6, the pre-mold insulator 21, the spring 22, the second protective cover 24 (see FIG. 1) and the like are provided on the CV cable 1 side. Then, the protective cover 16 (see FIG. 1) and the like are assembled on the OF cable 2 side, and the assembling work of the connecting portion between the different kinds of cables is completed.

[0015]

In the case of the conventional connecting portion between different kinds of cables and the assembling method as described above, the length dimension in the axial direction is large, and the connecting portion is required to be inserted into a manhole which is a limited space. There were inconveniences that installation was difficult or assembly workability was poor. That is, in the case of the assembling method of the first example shown in FIGS.
In the case of the assembling method of the second example shown in 1 to 13, the assembling workability is poor, and if the assembling workability is to be improved,
After all, the length dimension is increased. Hereinafter, the reason will be described.

First, in the case of the method of the first example shown in FIGS. 9 to 10, the reinforcing insulator 6, the holding nut 14, and the pre-mold insulator 21 are combined with the insulating layer 4a constituting the CV cable 1.
When the work of connecting the conductor connector 5a and the conductor 3a is performed, the reinforcing insulator 6, the retaining nut 14, and the pre-mold insulator 21 are retracted toward the center of the CV cable 1. There must be. The reason is that the inner diameter of the inward convex portion 13 which is the minimum inner diameter portion of the reinforcing insulator 6 is smaller than the outer diameter of the outward convex portion 11 which is the maximum outer diameter portion of the conductor connector 5a. This is because 5a cannot pass through the inside of the reinforcing insulator 6. Further, the pre-mold insulator 21 needs to be fitted to the outer peripheral surface of the insulating layer 4a of the CV cable 1 with the protective layer 15a stripped off. The portion of the insulating layer 4a exposed from the protective layer 15a at the end must be covered with the second protective cover 24. In addition, when connecting the conductor connector 5a and the conductor 3a, the conductor connector 5a must be completely exposed from the reinforcing insulator 6. Accordingly, in the case of the method of the first example, the length of the end portion of the insulating layer 4a exposed from the protective layer 15a and the axial dimension of the second protective cover 24 are increased, so that the length is reduced. The dimensions increase.

Next, in the case of the method of the second example shown in FIGS. 11 to 13, it is possible to reduce the length, but if the length is reduced, the connection portion on the OF cable 2 side is reduced. It is troublesome to perform the assembling work and inspect the connection portion on the OF cable 2 side for oil leakage. That is, FIG.
As shown in FIG. 13, if the assembling operation is performed only by exposing the insulating layer 4a of the CV cable 1 to a minimum necessary for externally fitting the pre-mold insulator 21, the length can be reduced. On the other hand, at the same time as the reinforcing insulator 6 is moved around the conductor connector 5a, the pre-mold insulator 21 is pushed into the other end of the reinforcing insulator 6, and the inside of the reinforcing insulator 6 is removed. It is made invisible from the CV cable 1 side. For this reason, after assembling the protective cover 16 on the OF cable 2 side, the protective cover 16 is filled with the insulating oil under pressure, and the oil is applied to the CV.
It cannot be visually confirmed whether or not the cable 1 has leaked to the connection portion side. If the amount of exposure of the insulating layer 4a of the CV cable 1 is increased and the pre-mold insulator 21 is retracted toward the center of the CV cable 1 at the time of the oil leakage inspection, visual leakage inspection becomes possible. However, the length dimension is increased instead. Also, in the case of the method of the second example, since the reinforcing insulator 6 covers the end of the OF cable 2 during the connection operation,
An insulating layer 4b exposed at the end of the F cable 2
The work of attaching the cover members 27a and 27b for protecting the camera is troublesome. In view of such circumstances, the present invention makes it possible to reduce the axial dimension and, if necessary, to facilitate the assembling work on the OF cable side, and to easily perform an oil leak inspection from the OF cable side. The present invention has been invented to realize a connection portion between different kinds of cables and a method of assembling the connection portion.

[0018]

According to the present invention, there is provided a connecting portion between heterogeneous cables and a method for assembling the same, wherein the connecting portion between heterogeneous cables according to the first aspect of the present invention is connected to an end of a conductor constituting an OF cable and a CV. It connects the ends of the conductors that make up the cable, and suppresses the conductor connector, the reinforcing insulator, the protective cover, the pre-mold insulator, the inward convex portion, the seal ring, and the outward convex portion. And a nut. Among these, the conductor connector connects a portion exposed from the insulating layer at an end of the conductor constituting the OF cable and a portion exposed from the insulating layer at the end of the conductor constituting the CV cable. The reinforcing insulator is formed in a cylindrical shape as a whole, and covers the conductor connector and the periphery of the ends of the OF cable and the CV cable. A cylindrical high-voltage shield electrode is provided on the inner peripheral surface of the intermediate portion. Embedded. Further, the protective cover seals a gap between one end of the reinforcing insulator and an outer peripheral surface of the OF cable in an oil-tight manner. In addition, the pre-molded insulator is provided between the inner peripheral surface of the other end of the reinforcing insulator and the C.
It is pushed in a wedge shape into a space between the outer peripheral surface of the insulating layer constituting the V cable and closes this space. The inward projection is provided on the inner peripheral surface of the intermediate portion of the high-voltage shield electrode over the entire circumference in a state of protruding radially inward. The seal ring seals a gap between an inner peripheral surface of the inward convex portion and an outer peripheral surface of an intermediate portion of the conductor connector. Further, the outwardly projecting portion is formed in a state of protruding radially outward at a portion adjacent to one side in the axial direction with a portion where the seal ring is provided on an outer peripheral surface of an intermediate portion of the conductor connector. Thus, the outer diameter is larger than the inner diameter of the inward convex portion. Further, the retaining nut is screwed to a portion adjacent to the other side in the axial direction with the portion where the seal ring is provided on the outer peripheral surface of the intermediate portion of the conductor connector, and the outer diameter thereof is the inward convex portion. Larger than the inner diameter of The conductor connector is fixed inside the reinforcing insulator by sandwiching the inward projection from both sides in the axial direction between the holding nut and the outward projection.
In particular, in the connection portion between different types of cables of the present invention,
The outwardly projecting portion is formed by connecting and fixing an annular fixing member separately from the main body portion of the conductor connector to the main body portion. The outer diameter of a portion of the intermediate portion of the conductor connector to which the fixing bracket is coupled and fixed is not larger than the outer diameter of a portion of the intermediate portion of the conductor connector where the seal ring is provided.

According to a second aspect of the present invention, there is provided a method of assembling a connecting portion between different kinds of cables, wherein the end of the conductor constituting the CV cable and the main body of the conductor connector are provided with a reinforcing insulator. Connect before fitting. Thereafter, the reinforcing insulator is externally fitted to the CV cable in a state where the fixing bracket is not yet fixedly connected to the main body of the conductor connector, and then the end of the conductor constituting the OF cable is connected to the conductor connection. Connect to the body of the child. Next, after fixing the fixing bracket to the main body portion of the conductor connector, the reinforcing insulator is connected to the conductor connector and the OF.
After moving the cable and the CV cable to a position covering the periphery thereof, the retaining nut is screwed into an intermediate portion of the conductor connector. Next, an operation of mounting the pre-mold insulator and the protective cover is performed.

[0020] More preferably, as described in claim 3, before the work of mounting the pre-molded insulator, the work of mounting the protective cover is performed, and then oil for insulation is added to the inside of the protective cover. Pressure filling. Then, after confirming that this oil has not leaked to the side where the end of the CV cable is inserted inside the reinforcing insulator, the mounting operation of the pre-mold insulator is performed.

[0021]

According to the connecting portion between different kinds of cables and the method of assembling the same according to the present invention, the axial dimension can be reduced. That is, the outwardly protruding portion provided on the outer peripheral surface of the intermediate portion of the conductor connector is for fixing the fixing bracket separately from the conductor connector later. The child can pass through the inside of the reinforcing insulator. For this reason, after connecting the conductor connector and the end of the conductor constituting the CV cable, the reinforcing insulator can be fitted over the CV cable. Therefore, during the connection work between the CV cable and the conductor connector, the length of retracting the pre-molded insulator externally fitted to the insulating layer constituting the CV cable toward the center of the CV cable can be reduced. become. As a result, the amount of exposure of the insulating layer constituting the CV cable can be reduced, and the length of the connection portion between different types of cables in the axial direction can be reduced.

If necessary, the assembling work on the OF cable side can be facilitated, and an oil leak inspection from the OF cable side can be easily performed. That is, in a state where the end of the conductor constituting the OF cable is connected to the conductor connector, the reinforcing insulator is present around the CV cable and does not cover the periphery of the end of the OF cable. . For this reason, the work of attaching a covering member or the like around the end of the OF cable can be easily performed. Moreover, the pre-molded insulator can be prevented from being pushed into the reinforcing insulator while the reinforcing insulator and the conductor connector are joined and fixed and a protective cover is provided around the end of the OF cable. . Accordingly, if the insulating oil is pressurized and filled in the protective cover in this state, it can be visually confirmed whether or not the oil leaks to the end of the CV cable inside the reinforcing insulator. .

[0023]

1 to 6 show an embodiment of the present invention. In the present invention, the basic structure of the connecting portion between the different kinds of cables described in claim 1 is the same as the conventional structure, and is as described above with reference to FIG. The description will be omitted or simplified, and the following description will focus on features of the present invention.

The conductor connector 5 constituting the connection portion between the different kinds of cables according to the present invention has a main body portion 28 as shown in detail in FIG.
And formed in an annular shape separately from the main body portion 28,
A fixing bracket 29 as shown in detail in FIG. 3 is connected and fixed by a connecting screw (not shown). Body part 28 of these
Are compression terminal portions 25, 25 for coupling the ends of the conductors 3a, 3b of the CV cable 1 and the OF cable 2 to both ends.
And a coupling column 9 in the center. A locking groove 10 for locking the O-ring is formed at the center of the connecting column 9, and a stepped portion for externally fixing the fixing bracket 29 to one end (the left end in FIG. 2). The male screw portion 12 is formed on the outer peripheral surface of the other end portion (right end portion in FIG. 2).

On the outer peripheral surface of the step portion 30, screw holes 31, 31 are formed at a plurality of positions (for example, four at equal intervals) separated from each other in the circumferential direction.
Each of the screw holes 31, 3
Through holes 32, 32 are formed at positions matching 1 to allow the inner and outer peripheral surfaces of the fixing bracket 29 to communicate with each other. Each of the through holes 32 is formed by connecting a small-diameter portion 33 near the inner diameter and a large-diameter portion 34 near the outer diameter by a step portion 35, and the small-diameter portion 33 has a rod portion of a coupling screw (not shown). Can be freely inserted, and the head of the coupling screw can be freely inserted into the large-diameter portion 34. Further, in the illustrated example, a male screw 36 is formed on the outer peripheral surface of the step portion 30, and a female screw 37 is formed on the inner peripheral surface of the fixing bracket 29.

The above-mentioned main body portion 28 and fixing fitting 29 are connected and fixed to each other to form the conductor connector 5, and this fixing fitting 29 functions as the outwardly protruding portion 11 (FIG. 1). To connect and fix the main body portion 28 and the fixing bracket 29, a female screw 37 formed on the inner peripheral surface of the fixing bracket 29 is screwed with a male screw 36 formed on the outer peripheral surface of the step portion 30, and The holes 31, 31 and the through holes 32, 3
In a state where the holes 2 and 3 are aligned, the connecting screws inserted through the through holes 32 are screwed into the screw holes 31 and further tightened. The axial length of the threaded portion of the two screws 37 and 36 is sufficiently large, and each of the through holes 3
The inner diameter of the small diameter portions 33, 33 of
Since the inner diameters of the connecting screws 1 and 31 are larger than the outer diameters of the connecting screws, the connecting screws inserted into the through holes 32 and 32 cannot be screwed into the screw holes 31 and 31, respectively.

The conductor connector 5 formed by coupling and fixing the main body portion 28 and the fixing bracket 29 as described above is
Inside the high-voltage shield electrode 7 constituting the reinforcing insulator 6,
It is supported and fixed by a holding nut 14 as shown in FIG. That is, the holding nut 14 is screwed and tightened to the male screw portion 12, and the holding nut 14 and the fixing metal 29 are used to move the inward convex portion 13 formed on the inner peripheral surface of the intermediate portion of the high-voltage shield electrode 7 in the axial direction. By pinching from both sides,
The conductor connector 5 is supported and fixed inside the high-voltage shield electrode 7.

The assembling work of the connecting portion between the different kinds of cables according to the present invention having the above-described configuration is performed as follows.
First, as shown in FIG. 5, the end of the conductor 3a constituting the CV cable 1 and one end (the right end in FIGS. 5 and 6) of the main body 28 of the conductor connector 5 are connected to the CV cable 1. The connection is made before the reinforcing insulator 6 is externally fitted. That is,
The protective layer 15a of the CV cable 1 is peeled off and the insulating layer 4
In addition to exposing the end of the conductor 3a, the end of the conductor 3a is exposed by removing the exposed end of the insulating layer 4a. Then, after the holding nut 14 is fitted over the insulating layer 4a, the end of the conductor 3a is inserted into the compression terminal 25 on one end of the conductor connector 5, and the compressor 26
As a result, the diameter of the compression terminal portion 25 is reduced. In this state,
The reinforcing insulator 6 has not been fitted to the insulating layer 4a of the CV cable 1 yet. Pre-mold insulator 21
May be externally fitted to the insulating layer 4a, but need not be externally fitted. Further, the conductor connector 5 is only the main body portion 28, and the fixing fitting 29 is not yet fixed to the main body portion 28.

After the end of the conductor 3a constituting the CV cable 1 and one end of the conductor connector 5 are connected as described above, the insulating layer 4 of the CV cable 1 is then connected.
The above-mentioned reinforcing insulator 6 is externally fitted to a. If the pre-molded insulator 21 has not been externally fitted prior to the connection work, prior to the external fitting work of the reinforcing insulator 6,
The pre-molded insulator 21 is externally fitted to the insulating layer 4a.

When the pre-molded insulator 21 and the reinforcing insulator 6 are externally fitted to the insulating layer 4a of the CV cable 1 as described above, the OF cable 2 is constructed as shown in FIG. The end of the conductor 3b to be connected and the other end (the right end in FIGS. 5 and 6) of the main body 28 of the conductor connector 5 are connected. At this time, the pre-molded insulator 21 and the reinforcing insulator 6 are connected to the compression terminal 25 at the other end of the main body 28.
Is retracted to the side of the CV cable 1 to the extent that the diameter can be reduced by the compressor 26. When performing the connection work on the OF cable 2 side, the fixing bracket 29 may be fixedly connected to the main body portion 28 in advance. However, in the illustrated example, the fixing bracket 29 is merely fitted to the end of the insulating layer 4b constituting the OF cable 2, but is not yet fixed to the main body portion 28.

When the end of the conductor 3b constituting the OF cable 2 is connected to the other end of the main body 28 of the conductor connector 5 as shown in FIG. The fixing bracket 29 is fixedly connected to the main body 28.
As described above, this connecting work is performed by screwing the fixing bracket 29 to the stepped portion 30 formed at the other end of the main body portion 28, further screwing the connecting screw into each of the screw holes 31, 31, and further tightening. It is done by doing. In this state, the OF
Around the end of the cable 2, covering members 27a and 27b (FIG. 1) are attached. This mounting operation is performed by the reinforcing insulator 6
It can be done easily without being disturbed.

After the fixing fitting 28 and the covering members 27a and 27b are mounted in this manner, the reinforcing insulator 6 is moved from the state shown in FIG. 6 to the state shown in FIG. Move to the left of the figure. At this time, the pre-mold insulator 21 is not moved, but remains at the position shown in FIG. The reinforcing insulator 6 covers the conductor connector 5 and the periphery of the ends of the OF cable 2 and the CV cable 1 and one side surface (the right side surface in FIG. 1) of the fixing bracket 29. One side surface (the left side surface in FIG. 1) of the inward convex portion 13 formed on the inner peripheral surface of the intermediate portion of the high-voltage shield electrode 7 is brought into contact. Further, in this state, the male screw portion 12 formed on the outer peripheral surface of the intermediate portion of the conductor connector 5
The holding nut 14 is screwed and further tightened. As a result,
The conductor connector 5 is fixed inside the reinforcing insulator 6.

Next, while the pre-mold insulator 21 is kept at the position shown in FIG. 6, one end (the left end in FIG. 1) of the reinforcing insulator 6 and the protective layer 15b which is the outermost layer of the OF cable 2 The protective cover 16 is mounted between the end portions of the protective cover 16. The oil supply plug 17 is provided in the protective cover 16.
, And pressurize and fill with insulating oil. Since the space between the inner peripheral surface of the intermediate portion of the reinforcing insulator 6 and the outer peripheral surface of the intermediate portion of the conductor connector 5 is sealed by the O-ring as described above, if this seal portion functions sufficiently, The oil pressurized and filled in the protective cover 16 is used to mount the pre-molded insulator 21 on the other end of the reinforcing insulator 6 (FIG. 1).
(Right end of the) does not get inside. Then, it is visually inspected from the other end opening side of the reinforcing insulator 6 whether or not the oil leaks to the side where the end of the CV cable 1 is inserted inside the reinforcing insulator 6. . And
After confirming that the oil has not leaked, mounting work of the pre-mold insulator 21, the pressing sleeve 23, the spring 22, the second protective cover 24, and the like is performed.

[0034]

The connecting portion between different kinds of cables and the method of assembling the same according to the present invention are constructed and operated as described above, so that they can be easily installed in a limited space such as the inside of a manhole and have excellent reliability. It is possible to realize a connecting portion between different kinds of cables having different properties.

[Brief description of the drawings]

FIG. 1 shows an example of an embodiment of the present invention in a completed state.
FIG.

FIG. 2 is a half cutaway view of a conductor connector.

3A and 3B show fixing brackets that are fixed to a main body portion of a conductor connector to form outward projections, and FIG.
(B) is a half cutaway view as viewed from the radial direction.

FIGS. 4A and 4B show a holding nut, and FIG. 4A is a half cutaway view seen from an axial direction and FIG.

FIG. 5 is a half cutaway view showing a first step of an assembly operation.

FIG. 6 is a half cutaway view showing a halfway process of an assembling operation.

FIG. 7 is a half cutaway view of a conventional conductor connector having an outwardly projecting portion integrated therein.

FIG. 8 is a view seen from the left side of FIG. 7;

FIG. 9 is a half cutaway view showing a first step of a first example of a conventional method.

FIG. 10 is a half cutaway view showing a halfway process of the assembling operation.

FIG. 11 is a half cutaway view showing a first step of a second example of the conventional method.

FIG. 12 is a half cutaway view showing a halfway process of the assembling operation.

FIG. 13 is a half cutaway view showing a further stroke.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 CV cable 2 OF cable 3a, 3b Conductor 4a, 4b Insulating layer 5, 5a Conductor connector 6 Reinforcement insulator 7 High-voltage shield electrode 9 Coupling column part 10 Locking groove 11 Outward convex part 12 Male screw part 13 Inward convex part 14 Suppression Nuts 15a, 15b Protective layer 16 Protective cover 17 Oil filler plug 18 Space 19 Oil passage hole 20 Circular recess 21 Pre-molded insulating layer 22 Spring 23 Pressing sleeve 24 Second protective cover 25 Compression terminal 26 Compressor 27a, 27b Covering member 28 Main body part 29 Fixing bracket 30 Step part 31 Screw hole 32 Through hole 33 Small diameter part 34 Large diameter part 35 Step part 36 Male thread 37 Female thread

Claims (3)

[Claims] 1. A conductor connector for connecting a portion of a conductor constituting an OF cable exposed from an insulating layer and a portion of a conductor constituting a CV cable exposed from an insulating layer to each other, and this conductor A tubular reinforcing insulator covering a connector and an end portion of the OF cable and the CV cable and having a tubular high-voltage shield electrode embedded in an inner peripheral surface of an intermediate portion thereof; A protective cover that seals the gap between the outer peripheral surface of the OF cable and the outer peripheral surface of the insulating layer constituting the CV cable in a wedge shape. A pre-molded insulator for closing the leverage space, an inward convex portion provided on the inner peripheral surface of the intermediate portion of the high-voltage shield electrode over the entire periphery in a state of protruding radially inward, The inner peripheral surface and the outer periphery of the middle part of the conductor connector A seal ring that seals oil-tight between the surface and a radially outwardly protruding part on the outer peripheral surface of the intermediate part of the conductor connector, on the part adjacent to one side in the axial direction with the part where this seal ring is installed Formed in the state of
The outer convex portion whose outer diameter is larger than the inner diameter of the inward convex portion is screwed to a portion adjacent to the other side in the axial direction with the portion where the seal ring is provided on the outer peripheral surface of the intermediate portion of the conductor connector. A holding nut having an outer diameter larger than the inner diameter of the inward projection, and holding the inward projection between the holding nut and the outward projection from both sides in the axial direction, thereby connecting the conductor. In the connection portion between the different kinds of cables in which the connector is fixed to the inside of the reinforcing insulator, the outwardly projecting portion is connected and fixed to the main body portion with an annular fixing member separate from the main body portion of the conductor connector. The outer diameter of the portion for coupling and fixing the fixing bracket at the intermediate portion of the conductor connector is not larger than the outer diameter of the portion where the seal ring is provided at the intermediate portion of the conductor connector. Characteristic connection between different cables . 2. The method for assembling a connection portion between different kinds of cables according to claim 1, wherein an end portion of a conductor constituting the CV cable and a main body portion of the conductor connector are connected to the CV cable by a reinforcing insulator. After the connection is made prior to external fitting, the reinforcing insulator is externally fitted to the CV cable in a state where the fixing bracket is not yet fixedly connected to the main body of the conductor connector. After connecting the end of the conductor to be configured and the main body of the conductor connector, and then fixing and fixing the fixing bracket to the main body of the conductor connector, the reinforcing insulator is connected to the conductor connector and the OF cable. And displaced to a position covering the periphery of the end of the CV cable, screw a retaining nut into the middle of the conductor connector, and then attach the pre-molded insulator and the protective cover. How to assemble the connection part. 3. A protective cover is attached before the pre-molded insulator is attached. Then, the protective cover is filled with an insulating oil under pressure, and C is inserted inside the reinforcing insulator.
3. The method for assembling a connection portion between different types of cables according to claim 2, wherein after confirming that the oil does not leak to the side where the end of the V cable is inserted, the work of mounting the pre-molded insulator is performed.