JP2928017B2 - Sleeve connection method for fan-shaped conductor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductor having a fan-shaped cross section, that is, a method of connecting power cables using a fan-shaped conductor by using a connection sleeve. is there.

[0002]

2. Description of the Related Art Recently, as a rubber / plastic power cable such as a crosslinked polyethylene power cable (CV cable), mainly for the purpose of downsizing,
As a high-voltage cable of the 66 kV class, a cable using a sector-shaped conductor having a sector-shaped cross section is being put to practical use. FIG. 10 shows an example of a three-core CV cable using such a fan-shaped conductor.

[0003] In FIG. 10, three fan-shaped conductors 1 are formed by twisting a plurality of good conductive wires such as copper wires and forming the entire cross-section into a fan shape. Each of the sector-shaped conductors 1 has an inner semiconductive layer 2, an insulator layer 3, an outer semiconductive layer 4, and a shielding layer 5 provided on the outer periphery in that order from the inner side, and these three conductors are circular as a whole. And an anticorrosion layer 6 is provided on the entire outer periphery thereof.

Conventionally, cables using fan-shaped conductors have been used exclusively for low-voltage applications of 22 kV to 33 kV or less. For such low-voltage cables, soldered sleeves are generally used to connect conductors. Was used. On the other hand, in a high-voltage cable of 66 kV class or higher using a normal circular conductor, a sleeve compression connection method has conventionally been adopted for conductor connection. Unlike the connection method using a soldered sleeve, this sleeve compression connection method does not use a fire unlike the connection method using a soldered sleeve, and there is no difference in the other performance points from the connection method using a soldered sleeve. In order to put the used cable into practical use in the 66 kV class or more, it is considered to apply the sleeve compression connection method.

In the sleeve compression connection method, generally, conductors are exposed by removing an insulating layer or the like at the end of each cable, and the exposed end of each conductor is inserted into the connection sleeve from both sides thereof, and then the sleeve is compressed. In applying such a sleeve compression connection method to the connection of the sector-shaped conductor as described above, generally, as shown in FIGS. 11 and 12, the conductor insertion holes 10 and 10 are used. 11
It is possible to use a connection sleeve 12 having conductor insertion holes 10 and 11 having a cross-sectional shape (cross-sectional shape of a hole) of a sector shape, that is, a shape adapted to the cross-sectional shape of the sector-shaped conductor 1. It is considered.

[0006]

As described above, when connecting a sector-shaped conductor by using a sleeve compression connection method using a connection sleeve having a sector-shaped conductor insertion hole, there are the following problems. .

That is, in manufacturing a connecting sleeve, a conductor insertion hole having a fan-shaped cross section must be formed. However, as compared with a case where a conductor insertion hole having a simple circular cross section is formed, It is extremely difficult to form a conductor insertion hole having a fan-shaped cross section, and the processing cost must be significantly increased. For this reason, there is a problem that the unit price of the connecting sleeve has to be increased, and the cost for connecting the conductor has to be increased.

Further, when the ends of the respective sector-shaped conductors are inserted into the respective sector-shaped conductor insertion holes of the connection sleeve from the left and right sides as described above, the direction of the sector shape of the tip surfaces of the left and right sector-shaped conductors (the top of the sector-shaped vertex). Direction) and the direction of the sector of each conductor insertion hole must match, but at the actual connection work site, the directions of the ends of the left and right sector conductors often do not match, so either one It is often troublesome that it is necessary to twist the conductor end portion before inserting it into the conductor insertion hole of the connection sleeve.

In general, when connecting conductors using a connection sleeve, in order to sufficiently increase the connection strength, that is, the limit strength at which the connection portion can withstand the force in the tensile direction with respect to the conductor, it is necessary to insert the conductor. It is necessary to increase the length of the hole to increase the contact area between the conductor surface and the inner surface of the conductor insertion hole. In this case, however, the length of the connection sleeve is inevitably increased, and the material cost of the connection sleeve is reduced.
The processing cost increases, and a problem also occurs in the sleeve compression operation after the conductor end is inserted into the conductor insertion hole. Therefore, it has been desired to develop a method that can increase the connection strength without increasing the length of the connection sleeve.

The present invention has been made in view of the above circumstances, and when connecting a sector-shaped conductor by a sleeve compression connection method, the processing cost of the connecting sleeve is low.
In addition, the work of inserting the conductor end into the conductor insertion hole of the connection sleeve is simple and easy, and in particular, a method of connecting a fan-shaped conductor sleeve which can obtain a sufficiently high connection strength without increasing the length of the connection sleeve. The purpose is to provide.

[0011]

In order to solve the above-mentioned problems, according to the present invention, when connecting the ends of the sector-shaped conductor having a sector-shaped cross section, conductor insertion holes are formed from both ends. In the method for connecting a fan-shaped conductor to the conductor insertion hole by inserting the end of the fan-shaped conductor into the conductor insertion hole of the connection sleeve and compressing the sleeve from the outer peripheral side thereof, the sleeve for connection is formed by inserting a conductor as the connection sleeve. Prepare a sleeve having a circular cross section of the hole, insert the end of the sector-shaped conductor into the conductor insertion hole, and further insert a wedge material into the gap between the inner surface of the conductor insertion hole and the outer surface of the sector-shaped conductor. Thereafter, the sleeve is compressed from the outer peripheral side.

Here, in order to obtain a sufficient connection strength improving effect by the wedge member, it is desirable to insert the wedge member only in a portion near the opening end of the conductor insertion hole.

[0013]

According to the method for connecting a sleeve of a sectoral conductor of the present invention,
As the connection sleeve, a conductor insertion hole having a circular cross section, that is, a sleeve similar to that used for connection of a conventional ordinary circular conductor is used. Then, at the time of conductor connection, the end of the fan-shaped conductor to be connected is inserted into the conductor insertion hole of the connection sleeve. At this time, the sectional shape of the fan-shaped conductor is sector-shaped, whereas the sectional shape of the conductor insertion hole of the connection sleeve is circular. Gaps are formed unevenly with the outer surface of the substrate. Therefore, a wedge member is inserted into the gap to substantially fill the gap. Thereafter, when the connection sleeve is compressed from the outer peripheral side in the same manner as in the related art, the connection sleeve and the sector-shaped conductor are crimped via the wedge member, and as a result, the sector-shaped conductors are connected.

If the wedge member is inserted only into the portion near the opening end of the conductor insertion hole, in other words, if the wedge member is not inserted into the deep portion of the conductor insertion hole, the opening of the conductor insertion hole will be reduced. The degree of deformation and the direction of deformation of the sector conductor differ between the vicinity of the end and the back, resulting in differences in the shape and dimensions after deformation.
This provides an anchor effect and can increase the strength of the conductor connection in the tensile direction.

Here, as described above, since the cross-sectional shape of the conductor insertion hole is used as the connecting sleeve,
The processing cost is much lower than in the case of manufacturing a sleeve having a conductor insertion hole having a sectoral cross section.

When the conductor end is inserted into the conductor insertion hole of the conductor sleeve, the conductor end has a circular cross section at that time, and the conductor insertion hole is also circular.
The directionality of the cross section of the conductor end does not particularly matter.

[0017]

1 and 2 show an example of a connecting sleeve used in the sleeve connecting method of the present invention.

1 and 2, the connecting sleeve 20
Is basically made of a good conductive material of the same material as the sector conductor to be connected. When the sector conductor is made of copper, the connection sleeve 20 is also made of copper, and the sector conductor is made of aluminum. In such a case, an aluminum alloy is also used for the connection sleeve 20. The connecting sleeve 20 is formed in a cylindrical shape as a whole in the same manner as a conventional normal circular conductor connecting sleeve, and conductor insertion holes 21 and 22 having a circular cross section are formed along the axial direction from both left and right ends. And
The left and right conductor insertion holes 21 and 22 are partitioned by a partition 23.

In carrying out the sleeve connecting method of the present invention, as shown in FIGS. 3 to 5, each end 1A of two sector-shaped conductors 1 to be connected is connected to a conductor insertion hole 21 of a connecting sleeve 20. , 22 and the conductor insertion holes 21, 22.
Plate-shaped wedge members 24 and 25 having a cross-sectional shape similar to the cross-sectional shape of the gap G are inserted into the gap G between the inner surface of the second and the outer peripheral surface of the fan-shaped conductor 1. Various materials can be used for the wedge members 24 and 25, but a material that is harder than the material of the connection sleeve 20 and is less likely to be plastically deformed, such as iron or stainless steel, is used. Here, the wedge members 24, 2
5 are conductor insertion holes 21 and 2, as shown in FIG.
Insert only into the part near the open end of No. 2. That is, of the total length L (= L ₁ + L ₂ + L ₃ ) of each of the conductor insertion holes 21 and 22, except for the inner portion having the length L ₁ and the opening end having the length L ₃ ,
Only to insert the Kusabizai 24,25 open end near the portion of the length L _2.

Thereafter, the connecting sleeve 20 is compressed from the outer peripheral surface side using a round die, a hexagonal die, or the like, as in the conventional method. Thereby, the connection sleeve 2
0 and the sector-shaped conductor 1 are compressed and deformed in a state where the wedge members 24 and 25 are sandwiched between them. The state after the compression deformation is shown in FIGS. Here, the compression of the sector-shaped conductor 1 between the part where the wedge members 24 and 25 are inserted (see FIG. 8) and the inner part where the wedge members 24 and 25 are not inserted (see FIG. 8) depends on the presence or absence of the wedge members. The degree and directionality of the deformation are different, so that the sectional shape and dimensions of the sector-shaped conductor 1 after the deformation are different. Therefore, an anchor effect can be obtained by such a difference in the cross-sectional shape and dimensions of the sector-shaped conductor 1. In other words, a portion corresponding to the inner part of the conductor insertion holes 21 and 22 (a portion without a wedge member) and a portion near the opening end of the conductor insertion holes 21 and 22 (a portion with the wedge members 24 and 25) are sector-shaped conductors. 1 are different in cross-sectional shape and dimensions, the boundary between the two functions as an anchor in the conductor pulling direction, and high connection strength is obtained in the conductor pulling direction. The conductor insertion holes 21 and
2 of the open end by (length of the L ₃ in FIG. 6) is to leave as there Shinano part wedge member, the material is the wedge member of the sleeve 20 by compressing the connection sleeve 20 at that portion Since the end surfaces of the wedge members 24 and 25 are covered from the side, the wedge members 24 and 25 are reliably prevented from coming off due to the force in the conductor pulling direction.

In the examples of FIGS. 3 to 8, the wedge members 24, 25
The one having a cross-sectional shape as close as possible to the cross-sectional shape of the gap G, that is, one whose thickness changes in the circumferential direction of the conductor insertion holes 21 and 22 is used. However, in some cases, as shown in FIG.
The wedge members 24 and 25 which do not change in the circumferential direction can also be used. In this case, since the wedge members 24 and 25 can be vertically divided hollow pipes having a circular cross section, The processing cost becomes extremely low.

The connection sleeve 20 shown in FIG. 1 has a partition wall 23 between the left and right conductor insertion holes 21 and 22. However, there is no partition wall 23 and the left and right conductor insertion holes are not provided. 21 and 22 may communicate with each other.

[0023]

According to the method for connecting a fan-shaped conductor sleeve of the present invention, the connection sleeve may be a conductor insertion hole having a circular cross section, so that the processing cost of the connection sleeve is low, and The sleeve for connecting circular conductors, which is widely used, can be used as it is, while the cost increase due to the wedge material is slight, so that the overall cost of the fan-shaped conductor connection work can be made lower than before, and When inserting the end of the conductor into the conductor insertion hole of the connection sleeve, there is no need to adhere to the directionality of the end face of the conductor end, so that the insertion operation itself becomes easy. In particular, when the wedge member is inserted only into the portion near the opening end of the conductor insertion hole of the connection sleeve, the connection strength against the force in the conductor pulling direction can be increased, and as a result, the connection sleeve can be shortened. be able to.

[Brief description of the drawings]

FIG. 1 is a partially longitudinal side view showing an example of a connection sleeve used in the sleeve connection method of the present invention.

FIG. 2 is a cross-sectional view taken along line AA or BB in FIG.

FIG. 3 is a vertical sectional side view showing an example of a state in which an end portion of a fan-shaped conductor and a wedge member are inserted into a conductor insertion hole of a connection sleeve in the sleeve connection method of the present invention.

FIG. 4 is a sectional view taken along line CC in FIG. 3;

FIG. 5 is a sectional view taken along line DD of FIG. 3;

FIG. 6 is a longitudinal sectional side view showing an example of a state in which the connecting sleeve is compressed from the outer peripheral surface side in the sleeve connecting method of the present invention.

FIG. 7 is a sectional view taken along line EE in FIG. 6;

FIG. 8 is a sectional view taken along line FF in FIG. 6;

9 is a view showing another example of the wedge member used in the sleeve connecting method of the present invention, and is a cross-sectional view at the same position as in FIG.

FIG. 10 is a sectional view showing a typical example of a three-core CV cable using a fan-shaped conductor.

FIG. 11 is a partially longitudinal side view showing a connection sleeve which is conventionally considered to be used for connecting a sector-shaped conductor by a sleeve compression connection method.

FIG. 12 is a sectional view taken along line GG or line HH in FIG. 11;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fan-shaped conductor 1A End part 20 Connection sleeve 21, 22 Conductor insertion hole 24, 25 Wedge material

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shotaro Yoshida 1-5-1 Kiba, Koto-ku, Tokyo Fujikura Electric Wire Co., Ltd. (72) Inventor Masayuki Tan 1-1-5-1 Kiba, Koto-ku, Tokyo Fujikura Electric Wire (72) Inventor: Akira Watanabe 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Electric Wire Co., Ltd. (56) References JP-A-60-109191 (JP, A) JP-B-45-29700 (JP) , B1) (58) Field surveyed (Int. Cl. ⁶ , DB name) H01R 4/20 H01R 43/048-43/055

Claims (2)

(57) [Claims] When connecting the ends of a sector-shaped conductor having a sector-shaped cross section, the ends of the sector-shaped conductor are inserted into the conductor insertion holes of the connection sleeve in which the conductor insertion holes are formed from both ends. In a method for connecting a sector-shaped conductor by connecting the sector-shaped conductor by compressing the sleeve from the outer peripheral side, a sleeve having a circular cross section of a conductor insertion hole is prepared as the connection sleeve, and the end of the sector-shaped conductor is provided. The wedge member is inserted into a gap between the inner surface of the conductor insertion hole and the outer surface of the fan-shaped conductor, and then the sleeve is compressed from the outer peripheral side. Connection method. 2. The method according to claim 1, wherein the wedge member is inserted only into a portion near an opening end of the conductor insertion hole.