JPH05251153A - Sector conductor connecting sleeve and sector conductor connecting method using this sleeve - Google Patents

Abstract

PURPOSE:To improve the connecting strength in the conductor pulling direction, and shorten a connecting sleeve at the time of connecting both sector conductors having a sector cross section with the sleeve compression-connecting method using a connecting sleeve. CONSTITUTION:In a connecting sleeve 20 provided with a conductor insertion hole 21 having a sector cross section, the outer profile of a cross section of a central part of the sleeve 20 in the axial direction and the outer profile of a cross section of both ends 24, 25 thereof are formed into elliptical, and a longitudinal direction of the cross section of the central part 23 and the longitudinal direction of the cross section of the both ends 24, 25 cross with each other. After inserting the end of a sector conductor 1 into the conductor insertion hole 21 of the connecting sleeve 20 with this structure, the whole of the connecting sleeve 20 is compressed from the peripheral side so as to form the cross section of each part into a circle having the same diameter to connect the sector conductor.

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 connecting sleeve for connecting electric power cables using the fan conductor, and connecting the fan conductors using the connecting sleeve. It is about how to do.

[0002]

2. Description of the Related Art Recently, mainly for the purpose of compacting rubber / plastic power cables such as cross-linked polyethylene power cables (CV cables),
As a high voltage cable of 66 kV class, a cable using a fan-shaped conductor having a fan-shaped cross section is about to be put into practical use. An example of a 3-core CV cable using such a fan-shaped conductor is shown in FIG.

In FIG. 12, three fan-shaped conductors 1 are each formed by twisting a plurality of good-conductivity wire rods such as copper wire rods and forming a fan-shaped cross section. 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 in this order from the inside on the outer circumference, and these three are circular as a whole. And the anticorrosion layer 6 is provided on the entire outer periphery thereof.

By the way, conventionally, a cable using a fan-shaped conductor is exclusively used only for a low voltage of 22 kV to 33 kV or less. As a cable for such a low voltage, a soldering sleeve is generally used for connecting conductors. Was used. On the other hand, in a high-voltage cable of 66 kV class or higher using an ordinary circular conductor, a sleeve compression connection method has been conventionally used for connecting conductors. This sleeve compression connection method does not use fire unlike the connection method using the soldering sleeve, and there is no difference in other performance from the connection method using the soldering sleeve. Even when the used cable is put to practical use in the 66 kV class or more, it is considered to apply the sleeve compression connection method.

In the sleeve compression connection system, the conductor layer is generally exposed by removing the insulating layer or the like at each cable end, and the exposed ends of each conductor are inserted into the connecting sleeve from both sides thereof, and then the sleeve is compressed. And connecting the conductors to each other. When applying such a sleeve compression connection method to the connection of the fan-shaped conductors as described above, the connecting sleeve 20 as shown in FIGS. 13 and 14 is generally used. It is possible. The connecting sleeve 20 is formed into a cylindrical shape so that the outer contour of the cross section is substantially circular over the entire length except for the tapered portions 20A at both ends, and the cross section is fan-shaped in cross section from both end sides along the axial direction. The conductor insertion holes 10 and 11 are formed.

[0006]

When the fan-shaped conductors are connected to each other by the sleeve compression connection method using the connecting sleeve as described above, there are the following problems.

That is, when the conductors are connected to each other using the connecting sleeve, in order to sufficiently increase the connecting strength, that is, the limit strength that the connecting portion can withstand the force in the pulling direction with respect to the conductor, the conductor insertion hole is required. It is necessary to increase the contact area between the conductor surface and the inner surface of the conductor insertion hole by increasing the length of the connection sleeve, but in this case the length of the connection sleeve will inevitably become longer, and the material cost and processing cost of the connection sleeve will increase. In addition, there is a problem in the sleeve compression work after inserting the conductor end into the conductor insertion hole. Therefore, it has been desired to develop a method capable of increasing the connection strength without increasing the length of the connecting sleeve.

The present invention has been made in view of the above circumstances, and when connecting the fan-shaped conductors by the sleeve compression connection method, sufficiently high connection strength can be obtained without increasing the length of the connection sleeve. An object of the present invention is to provide a sleeve for connecting a fan-shaped conductor and a method for connecting a fan-shaped conductor using the sleeve.

[0009]

In order to solve the above-mentioned problems, according to the present invention, the shape of the connecting sleeve, in particular, the outer surface shape (outer contour of the cross section) thereof is a shape that has not been considered in the past. And decided to.

That is, in the fan-shaped conductor connecting sleeve of the first aspect of the invention, conductor insertion holes having a fan-shaped cross section are formed from both ends along the axial direction, and the central portion in the axial direction has an outer shape of the cross section. The contours are formed in an oval shape, and the two end portions adjacent to the central portion are such that the outer contours of the respective cross sections are orthogonal to the major axis direction of the outer contours of the central portion. It is characterized in that it is made to have an elliptical shape having the longest diameter.

A second aspect of the present invention relates to a method of connecting fan-shaped conductors using the sleeve as described above.

Specifically, in the invention of claim 2, when connecting the ends of the fan-shaped conductors having a fan-shaped cross-section, the conductor insertion holes of the connecting sleeve are formed with conductor insertion holes from both ends. In the method of connecting a fan-shaped conductor by inserting the end portion of the fan-shaped conductor and compressing the sleeve from the outer peripheral side thereof, the conductor insertion hole has a fan-shaped cross section as the connecting sleeve. And the outer contour of the cross section of the central portion in the axial direction is formed in an oval shape, and the outer contours of the cross sections of both end portions adjacent to the central portion are respectively with respect to the direction of the major axis of the outer contour of the cross section of the central portion. Prepare a sleeve made to have an elliptical shape having a major axis in a direction orthogonal to each other, insert the end portion of the fan-shaped conductor into the conductor insertion hole, and then cut the connecting sleeve as a whole into pieces. There is characterized in that compressed from the outer peripheral side to a circular.

Here, the "ellipsoidal" shape of the outer contours of the cross section of the central portion and both end portions of the connecting sleeve is basically an arc having the same curvature on both end sides in a certain direction (major axis direction) passing through the center. And a shape in which the width in the direction (minor axis direction) orthogonal to the above direction (major axis direction) is smaller than the maximum length (maximum diameter, i.e. major axis) between the two arcs. Not only the ellipse in the sense of meaning, but also an ellipse, or a shape obtained by cutting a circle in parallel on its line-symmetrical side as shown in the embodiment, and further, extending or shortening the shape in the major axis direction. Shape etc. shall be included.

[0014]

The fan-shaped conductor connecting sleeve of the first aspect of the invention is
In the axial direction, it is divided into three parts, a central part and both end parts adjacent to both sides of the central part. Both the central part and both end parts are made so that the cross-section (cross section orthogonal to the axial direction) has an oval outer shape, and the major axis direction of the oval is the central part and both end parts. Is defined to be orthogonal to each other. When connecting fan-shaped conductors using such a connecting sleeve, insert the end of the fan-shaped conductor to be connected into the conductor insertion hole of the connecting sleeve with a fan-shaped cross section, and then use a round die, hexagonal die, or the like. By using the connecting sleeve, the connecting sleeve is compressed from the outer peripheral surface side, and the inner surface of the conductor insertion hole and the outer surface of the fan-shaped conductor are pressed against each other.

When connecting conductors in a general electric power cable, from the viewpoint of winding an insulating tape on the outer circumference of the connecting sleeve, the outer contour of the cross section of the sleeve after connecting the conductors is substantially circular over the entire length. desired. Therefore, even when the connecting sleeves in which the major axis directions of the outer contours (oval shapes) of the respective cross sections in the central portion and both end portions are orthogonal to each other as described above, the connecting sleeve and the fan-shaped conductor are Upon compression for crimping, it is desirable to deform the connecting sleeve into a circular cross section over substantially the entire length. Therefore, also in the connecting method according to the invention of claim 2, after inserting the end portion of the fan-shaped conductor to be connected to the conductor insertion hole of the connecting sleeve as described above, the entire sleeve is outer peripheral until the cross section of each portion becomes circular. It is supposed to compress from the side, but what is important here is that when the connecting sleeve of the above-mentioned shape is used to compress each part so that the cross section of each part becomes circular, the fan-shaped conductor inside the sleeve That is, the shape after the compressive deformation becomes different depending on each part.

That is, in the central portion of the connecting sleeve, the sleeve is compressed along the major axis direction of the outer contour of the cross section, and the fan-shaped conductor therein is also compressed and deformed in the same direction. It is compressed along the major axis direction of the outer contour of the cross section of the part (that is, the direction orthogonal to the major axis direction of the contour of the cross section of the central portion), and the fan-shaped conductor inside thereof is also compressed and deformed in that direction. In this way, the compressive deformation direction of the fan-shaped conductor in the central part of the sleeve is different from the compressive deformation direction of the fan-shaped conductors in both end parts of the sleeve. It will be different. As a result, a step exists on the surface of the fan-shaped conductor (the surface in contact with the inner surface of the conductor insertion hole) near the boundary position between the fan-shaped conductor inside the sleeve central portion and the fan-shaped conductor inside both end portions of the sleeve. The step functions as a mechanical anchor against the force in the conductor pulling direction, and prevents the fan-shaped conductor from coming out of the conductor insertion hole when a force in the pulling direction is applied to the fan-shaped conductor. Therefore, a large connection strength is exhibited with respect to the force in the conductor pulling direction.

[0017]

1 to 3 show an example of a connecting sleeve according to the invention of claim 1.

1 to 3, a connecting sleeve 20 is provided.
Is basically made of a good conductive material of the same material as the fan-shaped conductor to be connected. When the fan-shaped conductor is made of copper, copper is also used for the connecting sleeve 20, and the fan-shaped conductor is made of aluminum. In that case, an aluminum alloy is also used for the connecting sleeve 20. The connecting sleeve 20 is formed to have a hollow tubular shape as a whole by penetrating a conductor insertion hole 21 having a fan-shaped cross section along the axial direction.
Further, the connecting sleeve 20 has a central portion 23 having a length L ₁ and lengths L ₂ on both sides thereof along the axial direction thereof.
It is divided into three parts with both end parts 24 and 25 of L ₃ .

As shown in FIG. 2, the central portion 23 of the connecting sleeve 20 is formed so that the outer contour of the cross section orthogonal to the central axis is oval. That is, the outer contour of the cross section has a shape obtained by cutting left and right sides of a perfect circle with parallel straight lines. Therefore, the central portion 23 has a shape surrounded by two upper and lower circular arc surfaces 23A and 23B and two parallel planes 23C and 23D on both left and right sides. The major axis of the cross section of the central portion 23 (the circular arc surface 23A,
23B has a maximum diameter of R ₁ and a short diameter (parallel planes 23C and 23C).
The minimum diameter between D) is R ₂ . In the illustrated example, the fan-shaped center line P of the conductor insertion hole 21 (the line of symmetry passing through the apex of the fan shape) P is set so as to coincide with the major axis direction of the central portion 23.

On the other hand, both end portions 24 of the connecting sleeve 20,
Also in 25, as shown in FIG. 3, the external contour of the cross section orthogonal to the central axis is the same ellipse shape as described above, and the direction of the major axis is orthogonal to the direction of the major axis of the cross section of the central portion. Stipulated in. Therefore, both ends 24 and 25 are
Left and right two circular arc surfaces 24A, 24B; 25A, 25B
And two parallel planes 24C, 24D; 25 on the upper and lower sides.
It has a shape surrounded by C and 25D. And the major axis of the both end portions 24, 25 is R ₁ ,
Minor axis is the R _2, the major axis of the cross section of the end portions 24, 25 is parallel to the minor axis of the cross section of the central portion 23, a short radially central portion of the cross-section of the end portions 24, 25 23 Is parallel to the major axis direction of the cross section. Also, conductor insertion hole 2
The center line P of the sector 1 corresponds to the minor axis direction of the cross section of both end portions 24 and 25.

When connecting the fan-shaped conductors using the connecting sleeve 20 as described above, first, the connection should be made.
Each end 1A of the fan-shaped conductor 1 is inserted into the conductor insertion hole 21 of the connecting sleeve 20 from both sides thereof. And claim 2
In the case of the method according to the invention, the central part 2 of the connecting sleeve 20
3 and both end portions 24 and 25 are compressed from the outer peripheral surface side by a round die, a hexagonal die or the like. This compression is performed until the cross sections of the central portion 23 and both end portions 24, 25 become circular with the same diameter. In this way, the connecting sleeve 20
The state after compression molding is shown in FIGS.

As shown in FIG. 5, the connecting sleeve 2
In the central portion 23 of 0, the connecting sleeve 20 is compressed along the major axis direction of the cross section before compression, that is, in the direction of the fan-shaped center line P of the conductor insertion hole 21, so that the fan-shaped conductor 1 inside thereof has the same cross-section. It deforms along the direction of the center line P of the fan shape, and the original fan shape is crushed up and down to be flattened left and right. On the other hand, at both end portions 24 and 25 of the connecting sleeve 20, as shown in FIG. 6, along the major axis direction of the cross section before compression, that is, in the direction orthogonal to the direction of the fan-shaped center line P of the conductor insertion hole 21. The connecting sleeve 20 is compressed and therefore the fan-shaped conductor 1 inside it.
Also deforms along the direction orthogonal to the direction of the center line P of the fan shape of the cross section, and the original fan shape is crushed to the left and right to become a shape close to a circle.

As described above, in the compressed state of the connecting sleeve 20, the sleeve central portion 23 and both end portions 24,
25, the cross-sectional shape of the fan-shaped conductor 1 inside is different. Therefore, near the boundary between the two, there is a step on the surface of the fan-shaped conductor 1 (the surface that is in contact with the inner surface of the conductor insertion hole 21 of the connecting sleeve 20), and that portion is mechanical with respect to the force in the conductor pulling direction. Functioning as an anchor, the fan-shaped conductor 1 can be effectively prevented from coming off. Therefore, high connection strength is exhibited with respect to the force in the conductor pulling direction.

The cross-sectional outlines of the central portion 23 and both end portions 24 and 25 of the connecting sleeve 20 are shown in FIGS.
Alternatively, it may have an elliptical shape as shown in, or may have an elliptical shape as shown in FIGS. In any of these cases, the major axis direction of the cross section of the central portion 23 and the major axis direction of the cross sections of the end portions 24, 25 are orthogonal to each other,
The same effects as those of the embodiment shown in FIGS. 1 to 6 can be obtained.

In the above embodiment, the connecting sleeve 20 is used.
The major axis direction of the cross section of the central portion 23 of the above is made to coincide with the fan-shaped center line P of the conductor insertion hole 21, but it is not always necessary to define in this way, and for example, the cross section of both end portions 24, 25 of the connecting sleeve 20 The major axis direction may be aligned with the fan-shaped center line P of the conductor insertion hole 21.
The fan-shaped center line P of 1 is the central portion 2 of the connecting sleeve 20.
It may be determined to incline both in the major axis direction of No. 3 and in the major axis direction of both end portions 24, 25. In any case, since the cross sectional shape of the fan-shaped conductor 1 has an irregular cross section that is not circular, the central portion 23 of the connecting sleeve 20 and the end portions 24 and 25 have different compressive deformation directions. In the internal fan-shaped conductor 1, the central portion 23 of the connecting sleeve 20 and the end portions 24, 25 have different sectional shapes after compression, and as a result, the same action and effect as described above can be obtained.

When compressing the connecting sleeve 20, the entire sleeve is simultaneously compressed (the central portion 2).
3 and both end portions 24 and 25 are simultaneously compressed), or each portion may be individually compressed. In any case, it suffices that the shape of each part after compression finally becomes a circle having the same diameter.

Furthermore, in each of the above embodiments, the connecting sleeve 20 is used as the connecting sleeve 20 from one end to the other end thereof.
, The conductor insertion hole is partitioned in the middle by the partition wall 30, and the conductor insertion hole 21A on one end side and the conductor insertion hole on the other end side are divided as shown in FIG. The conductor insertion hole 21B may be isolated from the conductor insertion hole 21B. However, in this case, the length L ₁ of the central portion 23 needs to be sufficiently longer than the thickness T of the partition wall 30.

[0028]

According to the connecting sleeve of the first aspect of the present invention, the central portion of the connecting sleeve is provided with the conductor insertion holes having the fan-shaped cross section for inserting the two fan-shaped conductors to be connected from both sides. And both end portions are made so that the outer contour of each cross section becomes elliptical, and the major axis direction of the cross section of the central part and the major axis direction of the cross section of both end parts are orthogonal, and the cross section between both Since the directionality of the shape is different, if after inserting the fan-shaped conductor into the conductor insertion hole, the connecting sleeve is compressed from the outer peripheral surface side so that the cross section of the central part and the cross section of both end parts are circular with the same diameter, Of the parts of the fan-shaped conductor inserted into the connecting sleeve, the cross-sectional shape of the part located inside the central part of the connecting sleeve and the part located inside both end parts of the connecting sleeve Difference, which is why Sector conductor by the anchor effect at the boundary between them is that reliably and effectively prevented from escaping from the connection sleeve, it can exhibit high connection strength against tensile force. And since such a high connection strength can be obtained, it is not necessary to increase the total length of the connecting sleeve in particular, so that the connecting sleeve can be shortened for downsizing, and the material cost and processing cost of the connecting sleeve can be reduced as compared with the conventional one. Can also be lowered.

According to the sleeve connecting method of the second aspect of the present invention, when the fan-shaped conductors are actually connected to each other by using the connecting sleeve as described above, the length of the sleeve is not particularly lengthened. The fan-shaped conductors can be connected to each other with high connection strength.

[Brief description of drawings]

FIG. 1 is a partially longitudinal side view showing an example of a connecting sleeve of the invention of claim 1.

FIG. 2 is a cross-sectional view taken along the line AA of FIG.

FIG. 3 is a cross-sectional view taken along the line BB or the line CC of FIG.

FIG. 4 is a method of connecting a sleeve according to the invention of claim 2,
It is a vertical side view which shows an example of the state after compressing the connection sleeve.

5 is a cross-sectional view taken along the line DD of FIG.

6 is a cross-sectional view taken along the line EE or the line FF in FIG.

7 is a view showing another example of the connecting sleeve of the invention of claim 1, and is a cross-sectional view showing at the same position as in FIG.

8 is a sectional view showing the connecting sleeve of FIG. 7 at the same position as in FIG. 3;

FIG. 9 is a view showing still another example of the connecting sleeve of the invention of claim 1, and is a cross-sectional view at the same position as in FIG. 2.

10 is a sectional view showing the connecting sleeve of FIG. 9 at the same position as in FIG. 3;

FIG. 11 is a partial vertical cross-sectional side view showing another example of the connecting sleeve of the invention of claim 1;

FIG. 12 is a cross-sectional view showing a typical example of a 3-core CV cable using a fan-shaped conductor.

FIG. 13 is a partial vertical cross-sectional side view showing a connecting sleeve which is conventionally considered to be used when connecting sectorial conductors by a sleeve compression method.

14 is a cross-sectional view taken along line GG or HH of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 fan-shaped conductor 1A end part 20 connection sleeve 21, 21A, 21B conductor insertion hole 23 central part 24, 25 both end parts

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Atsushi Toya 1-3-1 Uchisaiwaicho, Chiyoda-ku, Tokyo Within Tokyo Electric Power Company (72) Inventor Shotaro Yoshida 1-1-5 Kiba, Koto-ku, Tokyo Fujikura Electric line company (72) Inventor Masayuki Tan 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Electric line Co., Ltd. (72) Inventor Watanabe 1-5-1, Kiba, Koto-ku, Tokyo Fujikura electric line Within the corporation

Claims (2)

[Claims] 1. A conductor insertion hole having a fan-shaped cross section is formed from both ends along the axial direction, and the central portion in the axial direction is formed so that the external contour of the cross section is oval. Further, both end portions adjacent to the central portion are formed such that the outer contour of the cross section thereof has an oval shape having a major axis in a direction orthogonal to the major axis direction of the outer contour of the cross section of the central portion. A fan-shaped conductor connection sleeve characterized in that 2. When connecting the ends of fan-shaped conductors having a fan-shaped cross section, the ends of the fan-shaped conductors are inserted into the conductor insertion holes of the connecting sleeve in which conductor insertion holes are formed from both ends. A method of connecting a sector conductor by compressing the sleeve from its outer peripheral side, wherein the conductor insertion hole has a sector cross section, and the external shape of the cross section of the central portion in the axial direction as the connection sleeve. The contour is formed in an elliptical shape, and the outer contours of the cross sections of both end portions adjacent to the central portion have an elliptical shape in a direction orthogonal to the major axis direction of the outer contour of the cross section of the central portion. Prepare a sleeve made so that the end of the fan-shaped conductor is inserted into the conductor insertion hole, and then the entire connecting sleeve from the outer peripheral side until the cross section of each part becomes circular. Sleeve connection sector conductors, characterized in that the condensation.