JPH09247839A - Structure of connecting high tension cable to equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to sufficiently reduce the length of a conductor connecting terminal or conductor brace and further their diameter, and to easily from smaller connections. SOLUTION: A conductor connecting terminal 8 is fit onto the conductor 1a of a CV cable 1, and wedges are driven in to secure them together. The conductor connecting terminal 8 has a stopper 12 screwed thereon. A multi- contact 6 is screwed on the buried upper hardware 4 of a covering tube 2. Electrical connection is provided by inserting the conductor connecting terminal 8 into the multi-contact 6. In addition, since the stopper 12 is brought into contact with the upper end face of a stress cone 13, the CV cable 1 will not come off.

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 high voltage cable to a device when a cable such as a CV cable is connected to a device direct connection type termination box such as a gas termination junction box or an oil termination junction box.

[0002]

2. Description of the Related Art When connecting a CV cable used for an underground power line to a GIS (gas switch) at a substation or the like, conventionally, a wedge-type connection structure as shown in FIG. 6 has been used. That is, on the GIS side, the sleeve 2 as shown in FIG.
Is provided. The sleeve 2 is a body made of epoxy resin, which is an insulator, having a connection hole 3 opened downward, and an embedded upper fitting 4 is embedded in the upper part of the connection hole 3. An embedded lower metal fitting 5 is embedded in the lower opening end of the connection hole 3. The connection hole 3 is provided with a tapered inner peripheral surface 3a. A terminal 21 of GIS is connected to the embedded upper metal part 4. In addition, this embedded upper metal fitting 4
A female screw 4b opening downward is screwed on the
A taper hole 4c is bored in the upper part of the female screw 4b. The embedded lower metal member 5 is provided with a plurality of female screws 5a for fixing bolts.

As shown in FIG. 8, a CV cable 1 has a cross-linked polyethylene insulator 1 around a conductor 1a made of a stranded wire.
The cable is covered with b, covered with an outer semiconductive layer 1c and a metal shielding layer 1d, and further covered with a vinyl sheath 1e. This CV cable 1 is shown in FIG.
As shown in FIG. 5, the conductor 1a is projected by exposing the end facing upward. Then, the protruding conductor 1 a is inserted into the wedge metal fitting 22 and the wedge tightening metal fitting 23. The wedge metal fitting 22 is a tubular metal fitting provided with a taper portion 22a on the upper half of the outer circumference, and is axially notched alternately from both ends to form a plurality of slits 22b. Also, one slit 22b (not shown) penetrates both ends of the wedge metal fitting 22. Then, the conductor 1a is inserted into the cylindrical inner diameter hole of the wedge metal fitting 22. The wedge-fastening metal fitting 23 is a tubular metal fitting that is externally fitted from below the wedge metal fitting 22, and has an external thread 23a on the outer peripheral portion and a tool groove 23b on a flange portion provided on the lower end base portion.

At the end of the CV cable 1 is shown in FIG.
As shown in, the stress cone 13 and the cable protection metal fitting 14 are fitted on the outside. The stress cone 13 is a spindle-shaped tubular EP rubber having a tapered portion 13c provided on the upper half of the outer circumference, and the upper half provided with the tapered portion 13c is made of an insulating rubber portion 13a. The side is composed of a semiconductive rubber portion 13b. The stress cone 13 is composed of the cross-linked polyethylene insulator 1b and the outer semiconductive layer 1 exposed at the end of the CV cable 1.
The outer peripheral surface of c is closely fitted. Cable protector 1
Reference numeral 4 denotes a tubular metal fitting that is fitted under the stress cone 13 and has a sufficiently large inner diameter other than the lower end portion. Further, a step is provided at the center of the inner diameter of the cable protection fitting 14, and the spring support ring 15 is engaged with the step. The lower ends of a plurality of springs 16 are locked to the spring support ring 15. And these springs 16
Is designed to push the stress cone 13 upward through a stress cone pushing metal fitting 17 having a plurality of rods 17a.

C with the stress cone 13 and the like attached
As shown in FIG. 7, the V-cable 1 is inserted into the connecting hole 3 of the sleeve 2 from below, and as shown in FIG. 6, the male screw 23 a of the wedge fastening metal fitting 23 is embedded in the upper metal fitting 4. Female screw 4
While being screwed into b, the cable protection fitting 14 is fixed to the sleeve 2 by the bolt 20 screwed into the female screw 5a of the embedded lower fitting 5, so that it is connected and fixed to the GIS. At this time, the wedge metal fitting 22 is pressed upward by screwing the wedge tightening metal fitting 23 into the embedded upper metal fitting 4. Then
In this wedge metal fitting 22, the tapered portion 22a is pressed against the taper hole 4c of the embedded upper metal fitting 4 to reduce the gap of the slit 22b shown in FIG. 9 and reduce the inner diameter, so that the conductor 1a of the CV cable 1 should be tightened. become. Therefore,
The conductor 1a is electrically connected to the embedded upper metal fitting 4 via the wedge metal fitting 22 and is securely held so as not to fall down.

Further, the semiconducting rubber portion 13b of the stress cone 13 is provided with a stress cone pressing member 17 and a rod 17
Since it is connected to the metal shield layer 1d of the CV cable 1 via a, it is possible to mitigate that the electric field concentrates at the terminal end of the CV cable 1 and the electric field gradient increases. Moreover, since the cable protection fitting 14 is fixed to the sleeve 2, the lower end of the spring 16 is supported on the sleeve 2 side via the spring support ring 15, so that the stress cone pushing member 17
Is urged upward to push up the stress cone 13, and the taper portion 13c of the stress cone 13 is inserted into the sleeve 2
The taper inner peripheral surface 3a is pressed and closely attached. Therefore, the semiconductive rubber portion 13b of the embedded upper metal fitting 4 and the stress cone 13 is
Between the epoxy resin and the insulating rubber part 1 which is an insulator
Since it is covered with 3a and no air layer is generated, there is no possibility of causing dielectric breakdown.

Further, the CV cable 1 may have a hooking type connection structure as shown in FIG. In this connection structure, the conductor 1a protruding from the end of the CV cable 1 is inserted into the compression portion 24a provided on the lower side of the conductor connection terminal 24 and fixed by being caulked from the surroundings. On the upper side of the conductor connecting terminal 24, a barbed hooking portion 24b is provided. In addition, the embedded upper metal fitting 4 of the sleeve 2 has the locking portion 4 at the lower end.
d is provided, and the upper portion of the tulip contact 25 is fitted therein. The tulip contact 25 is formed by combining a plurality of contact pieces 25a in a cylindrical shape and fitting a tightening spring 25b around the circumference, and the inner diameter of the cylindrical shape is urged by the tightening spring 25b to be contracted. There is. Then, the tulip contact 25 is fitted by expanding the inner diameter on the upper side and fitting the tulip contact 25 onto the locking portion 4d of the embedded upper fitting 4.

The conductor connecting terminal 24 fixed to the conductor 1a of the CV cable 1 pushes the hook portion 24b into the tulip contact 25 from below. Then, the inner diameter of the tulip contact 25 is widened and the catching portion 24b is fitted, so that the conductor 1a and the embedded upper metal fitting 4 are electrically connected via the tulip contact 25. Further, since the tulip contact 25 is strongly tightened by the tightening spring 25b, even if the CV cable 1 is pulled down, the conductor connecting terminal 2
The catching portion 24b of No. 4 can be securely held without falling off easily. Even in the case of this connection structure, the stress cone 13 is similar to the case of FIG.
The taper inner peripheral surface 3a of the sleeve 2 is closely attached.

[0009]

However, FIGS. 6 to 1
In the wedge type connection structure shown in 0, the wedge metal fitting 22
Since the taper portion 22a of No. 2 becomes long, there is a problem that the connecting portion cannot be downsized. Moreover, when the CV cable 1 is connected, the conductor 1 is formed by fitting the tool into the tool groove 23b of the wedge tightening metal fitting 23 and screwing it in.
Although it is necessary to fix a, this work is performed behind the connection hole 3 of the sleeve 2, so that there is a problem that the workability is extremely poor and the work becomes troublesome. Further, in order to screw in the wedge fastening member 23 with a tool as described above, it is necessary to push down the stress cone 13 closely fitted to the outer peripheral surface of the CV cable 1 sufficiently downward. There is a problem that the work of pulling up again and fixing the cable protection fitting 14 becomes troublesome.

Further, in the case of the hooking type connection structure shown in FIG. 11, the connecting work of the CV cable 1 becomes relatively simple, but the length of the connecting portion becomes longer due to the use of the tulip contact 25. In addition, since the diameter is inevitably increased because such a complicated connecting tool is used, there is a problem that the connecting portion cannot be downsized.

The present invention has been made in view of the above circumstances, and provides a high-voltage cable in which a cable can be easily connected, the cable does not easily come off, and the connecting portion can be downsized. It is intended to provide a connection structure to a device.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an electrical connection of a conductor projecting from the end of a cable to a connection fitting behind a connection hole of a sleeve provided in a connection device. Connection of the high-voltage cable to the equipment by pressing the taper outer peripheral surface on the terminal side of the stress cone that is externally fitted near the terminal end of this cable to the taper inner peripheral surface of the connecting hole of this sleeve. In the structure, the conductor connection terminal in which the plug-like connecting portion is provided on the cylindrical outer peripheral portion and the flange-like stopper portion having an outer diameter larger than that of the cable is provided on the base side of the connecting portion is The conductor protruding from the end is externally fitted and fixed, and the connecting portion of this conductor connecting terminal is inserted into a socket-type conductor receiving metal fitting fixed to the connecting metal fitting of the sleeve and electrically connected. Octopus The features.

According to the means, by simply inserting the connecting portion of the conductor connecting terminal, which is externally fitted and fixed to the conductor protruding from the end of the cable, into the conductor receiving metal fitting fixed to the connecting metal fitting of the sleeve. The conductor and the connecting fitting of the sleeve are electrically connected. And when the cable moves in the pulling direction,
Since the stopper portion provided on the conductor connecting terminal contacts the end surface of the stress cone on the terminal side, it is possible to prevent the cable from being pulled out. Moreover, since the conductor connecting terminal and the conductor receiving metal fitting can be sufficiently short in length and thin in diameter, the connecting portion can be easily miniaturized.

Further, the conductor connecting terminal is characterized in that a flange-shaped stopper portion is screwed on the base side of the cylindrical connecting portion.

According to the above means, it is not necessary to integrally form the connecting portion and the stopper portion of the conductor connecting terminal.

Further, a cylindrical inner peripheral hole of the conductor connecting terminal is externally fitted to the conductor protruding from the terminal end of the cable, and a wedge is driven into the conductor in the inner peripheral hole from the terminal side, and It is characterized in that the conductor is fixed to the conductor connecting terminal by screwing the set screw into the peripheral hole from the terminal side.

According to the above means, the conductor connecting terminal fitted on the conductor can be securely fixed without caulking, so that the accuracy of the outer diameter of the connecting portion can be easily maintained.

Furthermore, the inner peripheral hole of the conductor connection terminal is formed in an inverted taper shape whose inner diameter expands from the cable conductor insertion side toward the inner part.

According to the means (1), the wedge effect is enhanced and the conductor and the conductor connecting terminal can be more securely fixed to each other, which is a preferable result.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show an embodiment of the present invention. FIG. 1 is a vertical sectional view showing a connecting structure between a CV cable and a sleeve, and FIG. 2 is a vertical sectional view showing a structure of the sleeve. 3 is a vertical cross-sectional view showing the structure of the conductor connecting terminal and the stopper, FIG. 4 is a vertical cross-sectional view showing a state in which the conductor connecting terminal and the stopper are attached to the conductor of the CV cable, and FIG. 5 is an attachment to a CV cable such as a stress cone. It is a longitudinal cross-sectional view showing a structure. Components having the same functions as those of the conventional example shown in FIGS. 6 to 11 are denoted by the same reference numerals. In this embodiment, a case where the CV cable 1 is connected to the sleeve 2 provided in the GIS will be described. However, the cable may be of another type, and the device to which the cable is connected is not limited to GIS.

As shown in FIG. 2, the sleeve 2 has a body made of epoxy resin, which is an insulator, and a connection hole 3 that opens downward. The connection hole 3 is formed in the upper rear part of the connection hole 3. The embedded upper metal fitting 4 is embedded, and the embedded lower metal fitting 5 is embedded in the lower opening end of the connection hole 3. The connection hole 3 is provided with a tapered inner peripheral surface 3a having a diameter that becomes smaller toward the upper back. The embedded upper metal fitting 4 has a silver-plated upper end surface exposed on the sleeve 2 and is not shown in the drawing.
It is designed to be connected to the terminal. A female screw 4a that opens downward is screwed to the embedded upper metal member 4, and a multi-contact 6 is screwed to the female screw 4a. The multi-contact 6 is a socket-type conductor receiving metal fitting that can electrically connect to the shaft fitted and inserted in the inner circumference by the elasticity of the multi-ram band 6a provided in the inner circumference. There is a male screw 6b screwed on the outer circumference of the cylinder and screwed into the female screw 4a of the embedded upper fitting 4. The embedded lower metal member 5 is provided with a plurality of female screws 5a for fixing bolts. The sleeve 2 is fixed to the mounting portion 7 of the GIS by the embedded lower metal fitting 5.

As shown in FIG. 3, in the CV cable 1, the conductor 1a is protruded by exposing the end facing upward, and the protruded conductor 1a is inserted into the conductor connection terminal 8. In this case, the cylindrical inner peripheral hole (conductor insertion hole) H of the conductor connection terminal 8 is formed.
Is in the shape of an inverted taper whose inner diameter expands from the insertion-side end H ₀ of the conductor 1a toward its inner part. Conductor connection terminal 8
Is a tubular metal fitting having a female screw 8a screwed on the upper side of the inner circumference and having a diameter of the outer circumference which can be fitted and inserted into the multi-contact 6. Further, the conductor connecting terminal 8 has a small female screw 8b extending from the outer peripheral surface to the female screw 8a in the lateral direction at the top.
And the lower end base portion has a collar shape with a slightly larger diameter, and a male screw 8c is screwed on the outer periphery of the collar shape.
Then, first, the conductor 1a is inserted into the lower portion of the inner circumference of the conductor connecting terminal 8, and then the wedge 9 is attached to the conductor 1 from the female screw 8a side.
It is driven into a, and the set screw 10 is screwed to the female screw 8a, and the set screw 11 is also screwed to the small female screw 8b. Then, as shown in FIG. 4, the conductor 1a is crimped to the inner peripheral surface of the conductor connecting terminal 8 by the wedge 9, so that the conductor 1a and the conductor connecting terminal 8 are fixed to each other.

The wedge 9 is pressed by the set screw 10 so as not to come off, and the set screw 10 is also fixed by the set screw 11 so as not to loosen. When the conductor connecting terminal 8 is fixed to the conductor 1a in this manner, the stopper 12 is externally fitted to the conductor connecting terminal 8 from above and is screwed to the male screw 8c. The stopper 12 is a metal fitting having a disk-shaped outer peripheral edge portion extended downward in a cylindrical shape, and a female screw 12a is screwed into a central hole of the disk and a screwing portion 12b is provided. Then, the female screw 12a of the stopper 12 is screwed onto the male screw 8c of the conductor connecting terminal 8 and is tightened to the screw stop portion 12b.
The stopper 12 is integrated with the conductor connection terminal 8.

At the terminal end of the CV cable 1, as shown in FIG. 5, the stress cone 13 and the cable protection fitting 1 are provided.
4 is externally fitted. The stress cone 13 is a spindle-shaped cylindrical EP rubber, and the upper half is an insulating rubber part 13.
Although it is composed of a, the lower side is composed of a semiconductive rubber portion 13b. A taper portion 13c is provided on the upper half of the outer circumference of the stress cone 13. Then, the stress cone 13 is closely fitted to the outer peripheral surfaces of the cross-linked polyethylene insulator 1b and the outer semiconductive layer 1c exposed at the terminal end of the CV cable 1.

The cable protection metal fitting 14 is a tubular metal fitting fitted under the stress cone 13 and has a sufficiently large inner diameter other than the lower end portion. A step is provided at the center of the inner diameter of the cable protection fitting 14, and the spring support ring 15 is engaged with the step. The lower ends of a plurality of springs 16 are locked to the spring support ring 15. Then, these springs 16 are connected to the stress cone 1 through the stress cone pushing metal fitting 17 having a plurality of rods 17a.
3 is pushed up. Further, the rod 17a of the stress cone pressing member 17 has a mesh conductor 1
It is electrically connected to the metal shielding layer 1d of the CV cable 1 via 8. Further, a waterproof tape 19 is wound around the lower end portion of the cable protection metal fitting 14 fitted on the vinyl sheath 1e of the CV cable 1 so as to close the gap between them.

C with the stress cone 13 and the like attached
As shown in FIG. 2, the V cable 1 is inserted into the connection hole 3 of the sleeve 2 from below, and the conductor connection terminal 8 is inserted into the multi-contact 6 as shown in FIG. By fixing the cable protection metal fitting 14 to the sleeve 2 with the bolt 20 screwed to the female screw 5a of the metal fitting 5, it is connected and fixed to the GIS. At this time, the conductor 1a of the CV cable 1 is
The conductor connecting terminal 8 and the multi-contact 6 are electrically connected to the embedded upper fitting 4. However, since the conductor connection terminal 8 inserted in the multi-contact 6 can be pulled out by a relatively small pulling force (for example, a force of about 80 N), the CV cable 1 is inserted from below into the sleeve 2 as in the present embodiment. If inserted and connected, it may fall out due to its own weight.

Even when the CV cable 1 is inserted and connected laterally or from above, it is inconvenient if the CV cable 1 can be easily pulled out. However, the CV shown in FIG.
When the cable 1 moves downward, the stopper 12 screwed to the conductor connecting terminal 8 contacts the upper end surface of the stress cone 13. Therefore, the CV cable 1 does not fall off easily due to its own weight or other forces, and is securely connected and fixed to the sleeve 2. Moreover, as in the conventional case, the electric field gradient is alleviated by the semi-conductive rubber portion 13b of the stress cone 13, and the tapered portion 13c of the stress cone 13 is pressed and adhered to the tapered inner peripheral surface 3a of the sleeve 2 by the spring 16. Therefore, there is no possibility of causing dielectric breakdown.

As described above, by using the connection structure of this embodiment, the conductor 1a of the CV cable 1 and the sleeve 2 are electrically connected and the CV cable 1 is surely prevented from coming off. You can In addition, the conductor connecting terminal 8 can be formed sufficiently short because it is sufficient if the length to drive the wedge 9 and the length to screw the set screw 10 are sufficient, and the conductor connecting terminal 8 and the multi-contact 6 can be formed. The wall thickness can be made sufficiently thin, and CV cable 1 and sleeve 2
It is possible to reduce the size of the connection part with.

[0029]

As is apparent from the above description, according to the structure for connecting a high-voltage cable to a device of the present invention, the cable can be connected by a simple operation of inserting the connecting portion of the conductor connecting terminal into the conductor receiving metal fitting. It can be connected to the instrument sleeve. Then, the stopper portion provided on the conductor connection terminal is brought into contact with the stress cone, whereby it is possible to reliably prevent the connected cable from being pulled out. Moreover, since the conductor connection terminal and the conductor receiving metal can be inserted and electrically connected, it is possible to easily reduce the size of the connection portion by making the length sufficiently short and the diameter small. Become.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, in which C
It is a longitudinal cross-sectional view showing a connection structure of a V cable and a sleeve.

FIG. 2 shows an embodiment of the present invention and is a vertical sectional view showing a structure of a sleeve.

FIG. 3 shows an embodiment of the present invention and is a vertical cross-sectional view showing structures of a conductor connecting terminal and a stopper.

FIG. 4 shows an embodiment of the present invention and is a vertical cross-sectional view showing a state in which a conductor connecting terminal and a stopper are attached to a conductor of a CV cable.

FIG. 5 shows an embodiment of the present invention and is a vertical cross-sectional view showing a structure for attaching a stress cone or the like to a CV cable.

FIG. 6 shows a conventional example and is a vertical cross-sectional view showing a connection structure of a CV cable and a sleeve by a wedge method.

FIG. 7 shows a conventional example and is a vertical cross-sectional view showing a structure of a sleeve.

FIG. 8 is a cross-sectional view showing the structure of a CV cable.

FIG. 9 is a longitudinal sectional view showing a structure of a wedge metal fitting and a wedge fastening metal fitting, showing a conventional example.

FIG. 10 shows a conventional example and is a vertical cross-sectional view showing a structure for attaching a stress cone or the like to a CV cable.

FIG. 11 is a vertical sectional view showing another conventional example and showing a connection structure of a CV cable and a sleeve by a hooking method.

[Explanation of symbols]

 1 CV cable 1a conductor 2 sheath 4 embedded upper metal fitting 6 multi-contact 8 conductor connection terminal 9 wedge 10 set screw 12 stopper 13 stress cone

Claims (4)

[Claims] 1. A stress projecting from the end of a cable is electrically connected to a connecting fitting behind a connecting hole of a sleeve provided in a connecting device, and is externally fitted near the end of the cable. In a structure for connecting a high-voltage cable to a device in which the taper outer peripheral surface on the terminal side of the cone is pressed against the taper inner peripheral surface of the connecting hole of the sleeve to be in close contact with the equipment, a plug-shaped connecting portion is provided on the cylindrical outer peripheral portion, Also, a conductor connecting terminal having a flange-shaped stopper portion having an outer diameter larger than that of the cable on the base side of the connecting portion is externally fitted and fixed to a conductor protruding from the end of the cable, and A structure for connecting a high-voltage cable to a device, characterized in that a connecting portion of a connecting terminal is inserted into a socket-type conductor receiving metal fitting fixed to a connecting metal fitting of a sleeve and electrically connected thereto. 2. The structure for connecting a high-voltage cable to a device according to claim 1, wherein the conductor connection terminal is formed by screwing a flange-shaped stopper portion on the base side of a tubular connection portion. . 3. A cylindrical inner peripheral hole of the conductor connecting terminal is externally fitted to a conductor protruding from the end of the cable, and a wedge is driven into the conductor in the inner peripheral hole from the terminal side, and the inner peripheral hole is formed. The conductor is fixed to the conductor connecting terminal by screwing the set screw into the inside from the end side.
Alternatively, the structure for connecting the high-voltage cable according to claim 2 to a device. 4. The inner peripheral hole of the conductor connecting terminal is formed in a reverse taper shape whose inner diameter expands from the cable conductor insertion side toward the inner part. Connection structure for high voltage cables to equipment.