JP3369472B2 - CV cable connection method and structure of prefabricated connection part - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to, for example, 154 kV.
The present invention relates to a CV cable connecting method used when connecting an ultra high voltage CV cable and a structure of a prefabricated connecting portion therefor.

[0002]

2. Description of the Related Art Conventionally, a prefabricated junction box has been used for intermediate connection of a CV cable for ultrahigh voltage of 154 kV, for example. FIG. 5 shows an example of the structure of a prefabricated intermediate connection part using the prefabricated connection box 1A.

In this example, the cable conductor tips 4 of the first CV cable 2 and the second CV cable 3 to be connected,
5 are arranged so as to face each other, and are fitted into both sleeves 7 and 8 of the conductor connecting pipe 6 and then connected by compressing both sleeves 7 and 8. A contact ring 9 is integrally formed in the central portion of the conductor connecting pipe 6 so as to protrude from both sleeves 7 and 8 in the radial direction.

On the other hand, an embedded electrode 11 is integrally provided on the inner peripheral portion of the cylindrical epoxy unit 10 of the prefabricated connection box 1A, and the outer peripheral surface of the contact ring 9 of the conductor connection pipe 6 is the embedded electrode 11. It is in contact with the inner peripheral surface 12. As will be understood by also referring to FIG. 6, the inner circumferential surface 12 of the embedded electrode 11 has a linear guide groove 1 at a position facing each other in the diametrical direction.
3 is formed and communicates with the circumferential groove 14 formed on the inner peripheral surface of the embedded electrode 11.

Fixing pins 15 are formed on the outer peripheral surface of the contact ring 9 so as to face each other in the diametrical direction. This pin 1
5 is guided along the linear guide groove 13 of the embedded electrode 11 by moving the epoxy unit 10 in the axial direction, and is further formed in the circumferential direction by rotating the epoxy unit around the axis. It is fitted in the formed circumferential groove 14, and thereby acts to restrict the relative movement of the conductor connecting pipe 6 and the epoxy unit 10 in the axial direction.

Stop rings 16 and 17 made of, for example, FRP are arranged on both sides of the buried electrode 11, and the stopper ring 16 on the right side in FIG. 5 is the E of the first CV cable 2.
The P rubber stress cone 18 abuts, and the left stopper ring 17 abuts the EP rubber stress cone 19 of the second CV cable 3.

Flange metal fittings 21 and 22 are attached to both ends of the epoxy unit 10, and a unit protection tube 23 is arranged on the outer periphery thereof. In FIG. 5, an insulating cylinder 24 is fixed to the right flange 21 with bolts 25. At the other end of the insulating tube 24, the insulating tube flange 2
A stress cone compression device 27 is attached via 6 and presses the stress cone 18 against the epoxy unit 10.

The flange fitting 22 includes an insulating cylinder flange 2
A stress cone compression device 29 is attached via 8 and presses the stress cone 19 against the epoxy unit 10. Each stress cone compression device 27,
29 are cylindrical cable protection units 30 and 3, respectively
Surrounded by 1.

Next, the procedure for constructing such an intermediate connecting portion will be described with reference to FIG.

In this embodiment, the stress cone compressing device 27, the stress cone 18, the epoxy unit 10 and the like are attached to the cable terminal portion 2A which is terminated for connection of the first CV cable 2 located on the right side in FIG. insert. Next, the sleeve 7 on one side of the conductor connecting pipe 6 is fitted into the tip conductor 4 and compressed to compress the tip conductor 4 and the conductor connecting pipe 6.
And are connected together.

Subsequently, the second unit located on the left side in FIG.
After inserting the stress cone compression device 29, the stress cone 19, the stop ring 17 and the like into the cable end portion 3A that has been terminated for connection of the CV cable 3, the tip conductor 5 is attached to the other sleeve 8 of the conductor connection pipe 6. Fit in,
Compress. Thereby, the tip conductor 5 and the conductor connecting pipe 6 are integrally connected, and the tip conductor 5 of the second CV cable 3 is
It is electrically connected to the first CV cable 2 via the conductor connecting pipe 6.

Next, the epoxy unit 10, the stress cone 18, the stress cone compression device 27, etc., which were inserted into the cable terminal portion 2A of the first CV cable 2,
It moves to the left side in FIG. 7 and is installed at a predetermined position as shown in FIG. At this time, the epoxy unit 10 is moved in the axial direction so that the pin 15 formed on the ring 9 of the conductor connection pipe 6 fits into the linear guide groove 13 formed on the embedded electrode 11 of the epoxy unit 10, and then the epoxy unit 10 is moved. By rotating 10 in the circumferential direction by a predetermined angle, the pin 15 is fitted into the circumferential groove 14 formed in the embedded electrode 11. Then, the stress cone compression device 27 is bolted to the insulating cylinder 24 fixed to the epoxy unit 10, and the stress cone compression device 27 is adjusted to press the stress cone 18 against the epoxy unit 10.

Next, the stop ring 17, the stress cone 19, the stress cone compression device 29, etc., which were inserted into the cable end portion 3A of the second CV cable 3, are moved to the right side in FIG. 7, and are shown in FIG. The stress cone compression device 29 is bolted to the epoxy unit 10 in such a predetermined position. Furthermore, the stress cone 19 is pressed against the epoxy unit 10 by adjusting the stress cone compression device 29.

[0014]

As can be understood from the above description, according to the structure of the conventional prefabricated intermediate junction, that is, the conventional prefabricated intermediate junction box 1A is used to connect the CV cable. If yes, epoxy unit 1
Since the diameter difference between the diameter of the inner peripheral surface of the embedded electrode 11 formed to 0 and the outer diameter of the fixed pin 15 of the conductor connecting tube 6 is small, for example, not even 1 mm, as shown in FIG. It is necessary to insert the unit 10, the stress cone 18 and the like into the cable terminal portion 2A which has been terminal-processed in advance. Further, the left end of the epoxy unit 10 is located on the right side of the sleeve 7 of the conductor connecting pipe 6 so as to provide a space required for the compression connecting work between the tip conductor 4 of the first CV cable 2 and the conductor connecting pipe 6. Required.

Therefore, in the prior art, the length (L) of the cable-end portion 2A of the first CV cable 2 which has been subjected to the terminal treatment.
Therefore, there is a problem in that the length of the connection box portion on the first CV cable 2 side becomes long, and as a result, the overall size of the connection box 1 becomes large.

Further, after the tip conductor 4 of the first CV cable 2 is integrally connected with the conductor connecting pipe 6, the first CV cable 2
It is necessary to return the epoxy unit 10 that has been moved to the cable-end portion 2A, which has been subjected to the terminal treatment, to the left side in FIG. 7 and install it in the predetermined position as shown in FIG. As such, it is complicated and there is a problem in work efficiency. In addition, when the epoxy unit 10 is moved to a predetermined position, in the actual work, the inner peripheral surface of the embedded electrode 11 formed on the epoxy unit 10, the sleeve 7, the ring 9 or the pin of the conductor connecting pipe is pinched. There is a problem that the outer diameter portion of 15 is caught and it is extremely difficult to install the epoxy unit 10 at a predetermined position.
In this respect, further improvement is desired.

Therefore, an object of the present invention is to connect the tip conductor of the first CV cable with the conductor connecting pipe integrally, and then, after connecting the epoxy unit, the stress cone, the stress cone compression device, etc., to the terminal end of the first CV cable. A CV cable connecting method and a structure of a prefabricated connecting portion therefor, which can be inserted into a housing, can be easily set to a predetermined position of an epoxy unit, and can significantly improve working efficiency. Is to provide.

Another object of the present invention is to provide a structure of a prefabricated type connecting portion for connecting a CV cable which is excellent in workability and can be made smaller in overall structure.

[0019]

The above objects can be achieved by the method of connecting a CV cable and the structure of a prefabricated type connecting portion according to the present invention. In summary, the present invention employs an epoxy unit, a prefabricated connection with at least a stress cone and a stress cone compression device on each side of the epoxy unit, and first and second sleeves and the first sleeve.
And a method for connecting a first CV cable and a second CV cable with a conductor connecting pipe including a contact fitting detachably attached to the second sleeve and a fixing pin detachably attached to the contact fitting. And (a) a step of fitting the first sleeve of the conductor connecting tube into the tip conductor of the first CV cable and compressing the same to integrally connect the tip conductor of the first CV cable and the conductor connecting tube, (B) At least the stress cone compression device, the stress cone and the epoxy unit on the side of the first CV cable, with the contact fitting and the fixing pin removed from the conductor connecting pipe, the cable subjected to the terminal treatment of the first CV cable 2. The step of inserting into the terminal portion, (c) the second C
After inserting at least the stress cone compression device and the stress cone on the side of the second CV cable into the end portion of the cable of the V cable, the tip conductor of the second CV cable is inserted into the second sleeve of the conductor connecting pipe. And then compressing to integrally connect the tip conductor of the second cable and the conductor connecting pipe, (d) attaching the contact fitting and the fixing pin to the conductor connecting pipe, and then the first CV The epoxy unit inserted in the cable end portion of the cable is moved toward the contact fitting, and the fixing pin formed on the contact fitting is attached to the inner circumference of the epoxy unit around the circumference of the embedded electrode. Engaging in the directional groove, (e) the stress cone compression device inserted in the cable end of the first CV cable The step of fixing the stress cone to the epoxy unit and pressing the stress cone against the epoxy unit, and (f) the stress cone and the stress cone compressing device inserted in the cable end portion of the second CV cable of the epoxy unit. Moving toward one side, fixing the stress cone compression device to the epoxy unit, and pressing the stress cone against the epoxy unit, the CV cable connecting method.

According to another aspect of the present invention, a conductor connecting pipe for electrically connecting the first and second CV cables arranged opposite to each other, and an inner peripheral portion integrally arranged to cover the conductor connecting pipe. An epoxy unit having a buried electrode, and stress cones provided on the first and second CV cables by the respective stress cone compression devices provided on the first and second CV cables are attached to corresponding side surfaces of the epoxy unit. In the structure of the prefabricated type connecting portion which is pressed respectively, the conductor connecting pipe includes first and second sleeves into which the tip conductors of the opposed first and second CV cables are fitted, and the conductor connecting pipe. A support ring formed substantially at the center of the sleeve and having an outer diameter larger than the outer diameter of the sleeve; a contact fitting detachably attached to the support ring; And a fixing pin detachably attached to the outer peripheral surface, wherein the diameter of the outer peripheral surface of the support ring is the inner circumference of the stress cone compression device of the first CV cable, the stress cone and the epoxy unit embedded electrode. A structure for a prefabricated connection is provided that is smaller than the diameter of the surface. Preferably,
The contact fitting is composed of a plurality of divided bodies.

More preferably, the contact fitting is provided with a contact means, and the contact means is a housing fixed to a recess formed in the outer peripheral surface of the contact fitting, and is vertically movably fitted into the housing. And a compression spring that presses the contact ball toward the epoxy unit embedded electrode.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION The structure of a CV cable connecting method and a prefabricated type connecting portion according to the present invention will be described below in more detail with reference to the drawings.

FIG. 1 shows an embodiment of the structure of a prefabricated type connection box 1 used for the CV cable connection of the present invention, that is, a prefabricated type connection portion. Prefabricated connection box 1 of this embodiment
Is the prefabricated junction box 1 described with reference to FIGS.
Since the overall structure is similar to that of A, members having the same structure and function are designated by the same reference numerals, and detailed description thereof will be omitted. The structure of the conductor connecting pipe 6 and the method for connecting a CV cable using the prefabricated connection box 1 of the present invention will be described in detail below.

As is apparent from FIGS. 1 and 2, the conductor connecting pipe 6 which is a feature of the present invention is greatly different from the conventional conductor connecting pipe 6 in the structure having the contact fitting 61.

That is, according to the present invention, the conductor connecting pipe 6
Is the first and second sleeves 7 and 8 into which the tip conductors 2 and 3 of the first and second CV cables arranged to face each other are fitted,
A support ring 60 formed in the substantially central portion of the conductor connecting pipe 6 and having an outer diameter larger than the outer diameters of the sleeves 7 and 8.
And a contact fitting 61 detachably attached to the support ring 60, that is, to the first and second sleeves 7 and 8. The diameter of the outer peripheral surface of the support ring 60 is the stress cone compression device 27, the stress cone 1
8, stop ring 16, epoxy unit buried electrode 1
It is smaller than the inner diameter of the inner peripheral surface 12 such as 1.

The contact fitting 61 may be an integral cylindrical sleeve, but in this embodiment, in order to make it easier to attach / detach to / from the support ring 60, as shown in FIG. ) Contact metal fitting half 61a, 6
1b, and fixed to the support ring 60 with screws 65. Of course, the contact fitting 61 may be composed of a plurality of divided bodies of three or more. Further, the contact fitting 61 of the present invention has a tapered portion 62 formed on one end thereof, that is, on the outer peripheral surface in the direction of the first CV cable 2. As will be described later, this functions as a guide when returning the epoxy unit 10 loaded in the cable terminal portion 2A of the first CV cable 2 which has been subjected to the terminal treatment, to the predetermined position. The diameter of the outer peripheral surface of the contact fitting 61 is set so as to be in contact with the inner peripheral surface of the embedded electrode of the epoxy unit. Further, according to the present invention, the contact fitting 61 has a width in the axial direction,
Compared with the width of the conventional contact ring 9, approximately 1.5-2.
The width is increased to about 5 times, and this also increases the function as a guide when returning the epoxy unit 10 to a predetermined position.

Further, according to this embodiment, the contact fitting 70 is provided on the contact fitting 61. The contact means 70 has a housing 71 fixed to a recess 63 formed on the outer peripheral surface of the contact fitting 61, and a contact ball 72 fitted in the housing 71 so as to be vertically movable.
The contact ball 72 is urged outward by a compression spring 73, and is held slightly protruding from the outer peripheral surface of the contact fitting 61 by a stopper piece 74 formed at the entrance of the housing, and the contact ball 72 is kept outside It is restricted to jump out.

Further, according to the conductor connecting pipe 6 of the present invention, as will be understood by also referring to FIG.
In order to perform the same function as the conventional pin 15, in this embodiment, a hexagon socket head cap screw 64 as a fixing pin is screwed onto the outer peripheral surface of the contact fitting 61, for example, in a diametrically opposed manner. .

Next, a procedure for constructing the above-mentioned prefabricated intermediate connecting portion constructed according to the present invention will be described with reference to FIG.

According to the present invention, as shown in FIG. 4 (A), first, the first sleeve 7 of the conductor connecting pipe 6 is fitted into the tip conductor 4 of the first CV cable 2 and compressed to form the tip conductor 4. And the conductor connecting pipe 6 are integrally connected. At this time, the compression connection work between the tip conductor 4 and the conductor connection pipe 6 is not limited, but is performed with the contact fitting 61 and the fixing pin 64 removed from the conductor connection pipe 6, as shown in the figure. .

Then, as shown in FIG. 4 (B), with the contact fitting 61 and the fixing pin 64 removed from the conductor connecting pipe 6, in this embodiment, stress cone compression is performed from left to right in FIG. The device 27, the stress cone 18, the stop ring 16, the epoxy unit 10, and the like are inserted into the cable-terminated portion 2A of the first CV cable 2. At this time, the epoxy unit 10 and the like may be inserted into the first CV cable 2 within a minimum range, that is, within a range in which the conductor crimping work of the second CV cable 3 to be performed next can be performed. , The insertion amount is
The length could be shortened by about 100 to 150 mm.

Subsequently, after inserting the stress cone compression device 29, the stress cone 19, the stop ring 17 and the like into the end-treated cable end portion 3A of the second CV cable 3 located on the left side in FIG. 4 (C). The tip conductor 5 is fitted into the second sleeve 8 of the conductor connecting pipe 6 and compressed. As a result, the tip conductor 5 and the conductor connection pipe 6 are integrally connected, whereby the tip conductor 5 of the second CV cable 3 is electrically connected to the first CV cable 2 via the conductor connection pipe 6.

Next, the contact fitting 61 and the fixing pin 64 are attached to the conductor connecting pipe 6, and then the first CV cable 2 is attached.
The epoxy unit 10, the stop ring 16, the stress cone 18, the stress cone compressing device 27, etc., which have been inserted into the cable terminal portion 2A, are moved to the left side in FIG. 4 (C). At this time, the tapered portion 62 formed at one end of the contact fitting 61 engages with the inner peripheral surface of the embedded electrode 11 of the epoxy unit 10, guides the insertion of the epoxy unit 10 into the contact fitting 61, and moves the epoxy unit 10. Is very easily achieved.

The epoxy unit 10 has the same structure as the conventional one.
The fixing pin 64 attached to the contact fitting 61 is moved in the axial direction so as to fit in the linear guide groove 13 of the epoxy unit embedded electrode 11, and then the epoxy unit 10 is rotated by a predetermined angle in the circumferential direction. , The pin 64 fits in the circumferential groove 14 formed in the buried electrode 11.
In this state, the contact means 70 provided on the contact fitting 61
The contact ball 72 of the
It is pressed by and is brought into contact with the inner peripheral surface 12 of the embedded electrode 11. Thereby, the first and second CV cable conductors 4, 5
Electrical contact between the buried electrode 11 and the buried electrode 11 is ensured.

Next, the stress cone compression device 27 is bolted to the epoxy unit 10, and the stress cone compression device 27 is adjusted to press the stress cone 18 against the epoxy unit 10.

Next, the stop ring 17, the stress cone 19, the stress cone compression device 29, etc., which were inserted into the cable terminal portion 3A of the second CV cable 3, are moved to the right side in FIG. 4 and are shown in FIG. The stress cone compression device 29 is bolted to the epoxy unit 10 in such a predetermined position. Furthermore, the stress cone 19 is pressed against the epoxy unit 10 by adjusting the stress cone compression device 29.

With the above connecting procedure, the prefabricated intermediate connecting portion shown in FIG. 1 is achieved.

[0038]

As described above, the CV according to the present invention
According to the cable connecting method and the structure of the prefabricated type connecting portion, the conductor connecting pipe includes the first and second sleeves, the contact fittings detachably attached to the first and second sleeves, and the contact fittings. A cable which has a fixed pin freely attached to the end of the first CV cable and which has an epoxy unit, a stress cone, a stress cone compression device, etc. after the tip conductor of the first CV cable is fixed to the first sleeve of the conductor connecting pipe. Insert it into the terminal, and then use the 2nd C
Since the structure is such that the tip conductor of the V cable is fixed to the conductor connecting pipe and then returned to the predetermined position, the working efficiency can be remarkably improved, and the structure of the prefabricated type connecting portion is excellent in workability and An effect that the structure can be made smaller can be achieved.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing one embodiment of the structure of a prefabricated type connecting portion according to the present invention.

FIG. 2 is a partially enlarged sectional view of an epoxy unit and a conductor connecting pipe.

FIG. 3 is a front view of a conductor connecting pipe.

FIG. 4 is a process diagram illustrating a CV cable connection method according to the present invention.

FIG. 5 is a partial cross-sectional view showing the structure of a conventional prefabricated type connecting portion.

FIG. 6 is a front view showing a linear guide groove and a circumferential groove of an embedded electrode of an epoxy unit.

FIG. 7 is a diagram for explaining a conventional CV cable connection method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Prefabricated type connection box 2, 3 1st and 2nd CV cables 4, 5 1st and 2nd CV cable conductors 6 Conductor connection pipes 7, 8 1st and 2nd sleeves 10 Epoxy unit 11 Embedded electrodes 13 Straight guide groove 14 Circumferential groove 16, 17 Stop ring 18, 19 Stress cone 27, 28 Stress cone compression device 60 Support ring 61 Contact fitting 64 Fixing pin 70 Contact means

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-5-199643 (JP, A) JP-A-7-255113 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02G 15/08 H02G 1/14

Claims (4)

(57) [Claims] 1. An epoxy unit, a prefabricated connection comprising at least a stress cone and a stress cone compression device on each side of the epoxy unit.
And a second sleeve, a contact fitting detachably attached to the first and second sleeves, and a fixed pin detachably attached to the contact fitting, and a first CV cable is formed by a conductor connecting pipe. In a method of connecting to a second CV cable, (a) the first sleeve of the conductor connecting pipe is fitted into the tip conductor of the first CV cable and compressed to connect the tip conductor of the first CV cable to the conductor. A step of integrally connecting with a pipe, (b) with the contact fitting and the fixing pin removed from the conductor connecting pipe,
Inserting at least the stress cone compression device, the stress cone and the epoxy unit on the side of the first CV cable into the end-treated cable end portion of the first CV cable 2, (c) the end treated cable end of the second CV cable. After inserting at least the stress cone compression device and the stress cone on the side of the second CV cable into the portion, the tip conductor of the second CV cable is fitted into the second sleeve of the conductor connecting pipe, compressed, and A step of integrally connecting the tip conductor of the cable and the conductor connection pipe, (d) attaching the contact fitting and the fixing pin to the conductor connection pipe, and then inserting the contact end portion of the first CV cable into the cable end portion Was moved to the contact fitting, and the epoxy unit formed on the contact fitting was removed. Engaging the pin with a circumferential groove of an embedded electrode provided on the inner peripheral portion of the epoxy unit; (e) the stress cone compression device inserted into the cable end portion of the first CV cable. Fixing to the epoxy unit and pressing the stress cone against the epoxy unit; and (f) the second C
The stress cone and the stress cone compression device inserted in the cable end portion of the V cable are moved toward the epoxy unit, the stress cone compression device is fixed to the epoxy unit, and the stress cone is attached to the epoxy unit. A method of connecting a CV cable, characterized in that each step includes a step of pressing the unit. 2. An epoxy unit provided with a conductor connecting pipe for electrically connecting the first and second CV cables arranged opposite to each other, and an embedded electrode integrally provided on an inner peripheral portion, the conductor connecting pipe being arranged so as to cover the conductor connecting pipe. And a stress-cone compression device provided on each of the first and second CV cables for pressing the stress cone provided on each of the first and second CV cables against a corresponding side surface of the epoxy unit. In the structure of the formula connection part, the conductor connection pipe includes the first and second Cs arranged to face each other.
First and second sleeves into which the tip conductor of the V-cable is fitted, a support ring formed at substantially the center of the conductor connecting pipe and having an outer diameter larger than the outer diameter of the sleeve, and being attached to and detached from the support ring. Contact fittings attached freely,
And a fixing pin detachably attached to the outer peripheral surface of the contact fitting, wherein the diameter of the outer peripheral surface of the support ring is such that the stress cone compression device, the stress cone and the epoxy unit embedded in the first CV cable are embedded. A structure of a prefabricated type connecting portion characterized in that the diameter is smaller than the inner peripheral surface of the electrode. 3. The structure of the prefabricated connection part according to claim 2, wherein the contact fitting is composed of a plurality of divided bodies. 4. The contact fitting is provided in the contact fitting, and the contact means is a housing fixed to a recess formed on the outer peripheral surface of the contact fitting, and a contact fitted in the housing so as to be vertically movable. 4. The structure of the prefabricated connection part according to claim 2, further comprising a ball and a compression spring that presses the contact ball toward the epoxy unit embedded electrode.