JP2020187956A - Connection structure of aluminum conductor cable to terminal block, terminal block and terminal - Google Patents

Abstract

To provide: a connection structure of an aluminum conductor cable to a terminal block, capable of using a terminal box for a copper conductor cable before replacement, a switch board, etc., without enlarging a switch board, etc. and increasing a size of a terminal block, when a copper conductor cable is replaced with an aluminum conductor cable with a large size; a terminal block; and a terminal.SOLUTION: In a connection structure 1 of an aluminum conductor cable to a terminal block, a terminal 4 including a battledore-shaped portion 42 with a size for sizes smaller than the size of a conductor 31 of the aluminum conductor cable 3 is attached to the conductor 31, the battledore-shaped portion 42 of the terminal 4 is connected to a unipolar terminal block 21 so that the aluminum conductor cable 3 is connected to the unipolar terminal block 21, a plurality of unipolar terminal blocks 21 are provided in parallel to form the terminal block 2, and a spacer 5 is located between the unipolar terminal blocks 21.SELECTED DRAWING: Figure 1

Description

The present invention relates to a connection structure of an aluminum conductor cable to a terminal block, a terminal block and terminals.

For example, when connecting a conductor of an electric wire / cable (hereinafter, the electric wire / cable is simply referred to as a cable) to a terminal block installed in a switchboard, a distribution board, or the like, first, the terminal is attached to the conductor. At that time, the conductor of the cable is inserted into the tube of the terminal, and in the case of a compression terminal, the entire compression tube is crimped together with the conductor, and in the case of a crimp terminal, the crimp tube is locally crimped together with the conductor.
Then, the battledore portion of the terminal to which the conductor of the cable is attached is connected by tightening the terminal portion of one pole of the terminal block or the like.

On the other hand, copper is widely used as the conductor of cables currently used for power distribution, but aluminum, which is lighter than copper, may be used in order to improve workability and reduce the burden on workers. Yes (see Non-Patent Document 1 etc.). That is, there are increasing cases where copper conductor cables, which have been widely used so far, are replaced with aluminum conductor cables.
In the present specification, the term copper includes not only pure copper but also a copper alloy, and the term aluminum includes not only pure aluminum but also an aluminum alloy. Further, in the present specification, an electric wire / cable whose conductor is copper or a copper alloy is referred to as a copper conductor cable, and an electric wire / cable whose conductor is aluminum or an aluminum alloy is referred to as an aluminum conductor cable.

At that time, since the conductivity of aluminum is only about 60% of that of copper, it should be replaced with an aluminum conductor cable that is one or two sizes larger than the copper conductor cable before replacement in order to secure the same energizing capacity as the copper conductor cable. There are many.
For example, since the energization capacity (allowable current) of the 600 V copper conductor cable 60 mm ² is 210 A, it will be replaced with an aluminum conductor cable having an energization capacity of 225 A of 100 mm ² in order to obtain a larger energization capacity.

Japan Electric Wire Manufacturers Association, "600V Aluminum Conductor Cross-Linked Polyethylene Cable" (JCS 4348: 2017)

In this way, when the copper conductor cable is replaced with the aluminum conductor cable, as the cable size is increased, a larger terminal can be attached to the conductor.
Therefore, a terminal block having a larger size is used as the terminal block to which the battledore portion of the terminal is connected.

However, since equipment other than the terminal block is often provided in the switchboard or distribution board to which the cable is connected and the space is limited, a terminal block of a larger size is used as described above. There are many cases where you cannot use it even if you want to use it.
Further, even if it is possible to enlarge the panel and arrange a terminal block of a large size in the panel, there are cases where the equipment is installed around the panel and the panel cannot be enlarged. Furthermore, there is a problem that increasing the size of the board or terminal block leads to an increase in cost.

The present invention has been made in view of the above problems, and when replacing a copper conductor cable with a large-sized aluminum conductor cable, the size of the terminal block is not increased or the switchboard or the like is not increased before the replacement. It is an object of the present invention to provide a terminal block for a copper conductor cable, a terminal block and a terminal for connecting an aluminum conductor cable to a terminal block, which can be used as a switchboard or the like.

In order to solve the above problem, the invention according to claim 1 is based on a structure for connecting an aluminum conductor cable to a terminal block.
A terminal having a wing plate portion having a size smaller than the size of the conductor is attached to the conductor of the aluminum conductor cable, and the wing plate portion of the terminal is connected to a unipolar terminal block to form the aluminum. The conductor cable is connected to the unipolar terminal block,
A plurality of the unipolar terminal blocks are arranged side by side to form the terminal block.
It is characterized in that a spacer is arranged between the unipolar terminal blocks.

The invention according to claim 2 is characterized in that, in the structure for connecting the aluminum conductor cable according to claim 1 to the terminal block, at least the battledore portion of the terminal is made of copper.

The invention according to claim 3 is the structure for connecting the aluminum conductor cable according to claim 1 or 2 to the terminal block, wherein the spacer is a tubular portion of the terminal connected to the unipolar terminal block. It is characterized by having an insulating plate extending in the area between.

According to the fourth aspect of the present invention, in the connection structure of the aluminum conductor cable according to the third aspect to the terminal block, the insulating plate is integrally formed with the spacer.

The invention according to claim 5 is a terminal block used for a connection structure of the aluminum conductor cable according to any one of claims 1 to 4 to the terminal block.
A plurality of the unipolar terminal blocks are arranged side by side, and a spacer is arranged between the unipolar terminal blocks.

The invention according to claim 6 is a terminal used in the connection structure of the aluminum conductor cable according to any one of claims 1 to 4 to the terminal block.
It is characterized in that it is attached to the conductor of the aluminum conductor cable and includes a battledore portion having a size smaller than the size of the conductor.

According to the present invention, when replacing a copper conductor cable with a large-sized aluminum conductor cable, the terminal block, switchboard, etc. for the copper conductor cable before replacement can be replaced without increasing the size of the terminal block or the switchboard. It can be used.

It is a figure which shows the connection structure to the terminal block of the aluminum conductor cable which concerns on this embodiment. It is a figure which shows the insulation cap which covers the aluminum conductor cable and the attachment part of a terminal. (A) It is a figure showing a unipolar terminal block with a side wall erected on one side of the side surface portion of the base, and (B) the side wall is erected on both sides of the side surface portion of the base, and represents a unipolar terminal block. It is a figure. (A) It is a figure which shows the terminal which concerns on this Embodiment, (B) is a figure which shows the terminal for the conductor cable of 100mm ² , and (C) is the figure which shows the terminal for 60mm ² . It is a figure which shows the state which connected the aluminum conductor cable of 100mm ² to the unipolar terminal block of 60mm ² via the terminal which concerns on this embodiment. It is a figure which shows the insulating plate extending from each spacer to the region between cylinders. It is an enlarged view of the attachment part of a spacer and an insulating plate. It is a figure which shows the correspondence at the time of replacing a 600V copper conductor cable with an aluminum conductor cable.

Hereinafter, embodiments, the connection structure of the aluminum conductor cable according to the present invention to the terminal block, the terminal block, and the terminals will be described by way of exemplifying with reference to the drawings. However, although the embodiments described below are provided with various technically preferable limitations for carrying out the present invention, the scope of the present invention is not limited to the following embodiments and illustrated examples.
Further, in the following, a case where the copper conductor cable having a conductor size of 60 mm ² is replaced with an aluminum conductor cable having a conductor size of 100 mm ² will be described as an example.

FIG. 1 is a diagram showing a connection structure of an aluminum conductor cable according to the present embodiment to a terminal block. Hereinafter, the connection structure of the aluminum conductor cable to the terminal block is simply referred to as a connection structure.
In the present embodiment, in the connection structure 1, the terminal 4 is attached to the conductor 31 of the aluminum conductor cable 3, and the wing plate portion 42 of the terminal 4 is connected to the unipolar terminal block 21, so that the aluminum conductor cable 3 is simply connected. It is connected to the polar terminal block 21. A plurality of unipolar terminal blocks 21 are arranged side by side to form a terminal block 2, and a spacer 5 is arranged between the unipolar terminal blocks 21.
As shown in FIG. 2, the mounting portions of the aluminum conductor cable 3 and the terminal 4 may be covered with the insulating cap 6.

The terminal block 2 is formed by arranging a plurality of unipolar terminal blocks 21 side by side. For example, in the case of a CVT cable, three poles, that is, three unipolar terminal blocks 21 are arranged side by side, and in the case of a CVD cable, two poles, that is, two unipolar terminal blocks 21 are arranged side by side.
Then, in the present embodiment, even when the 60 mm ² copper conductor cable is replaced with the 100 mm ² aluminum conductor cable 3 as described above, the terminal block 2 and the unipolar terminal block 21 constituting the terminal block 21 are 60 mm before the replacement. terminal block 2 and Tankyokugata terminal block 21 for ² copper conductor cables are used. That is, the terminal block 2 and Tankyokugata terminal block 21 for copper conductor cable sizes of the conductor 31 of the aluminum conductor cable 3 connected (100 mm ²⁾ smaller size (60 mm ²⁾ is used.

As shown in FIG. 3A, the unipolar terminal block 21 has terminal screws 24 for tightening and attaching the terminal 4 to the conductive plate 23 at both ends of the conductive plate 23 arranged on the base 22. It is provided, and a partition wall 25 is provided between the two terminal screws 24. A side wall 26 is erected on the side surface of the base 22.
The side wall 26 may be provided on only one side of the base 22 as shown in FIG. 3 (A), or may be provided on both sides of the base 22 as shown in FIG. 3 (B). .. Further, in FIGS. 1 and 2, a unipolar terminal block 21 having side walls 26 provided on one side of the base 22 is shown, but unipolar terminals 26 provided on both sides of the base 22. A type terminal block 21 (see FIG. 3B) may be used.

As shown in FIG. 1, the aluminum conductor cable 3 is formed by twisting aluminum wires to form a conductor 31. In the present embodiment, as described above, the aluminum conductor cable 3 having a conductor 31 size of 100 mm ² is formed. Is used.
Further, the conductor 31 is covered with an insulating sheath 32.

As shown in FIG. 4A, the terminal 4 has a cylindrical tubular portion 41 into which the conductor 31 of the aluminum conductor cable 3 is inserted, and a battledore 42 that is flat and has a hole in the central portion of the flat plate. A battledore 42 is attached to one end side of the cylinder 41. In the present embodiment, the tubular portion 41 has the same size as that for the 100 mm ² aluminum conductor cable, but the battledore 42 has the same size as that for the 60 mm ² copper conductor cable. The one of the size is used.
That is, in the present embodiment, the battledore portion 42B of the terminal 4B for 60 mm ² shown in FIG. 4 (C) is provided on one end side of the tubular portion 41A of the terminal 4A for the conductor cable of 100 mm ² shown in FIG. 4 (B). Attached, the terminal 4 is formed.

As described above, in the present embodiment, the tubular portion 41 of the terminal 4 is of the same size as the conductor 31 of the aluminum conductor cable 3, but the battledore portion 42 of the terminal 4 is the aluminum conductor cable 3. It is configured to have a size smaller than that of the conductor 31 of the above.
With this configuration, it is possible to attach the 100 mm ² aluminum conductor cable 3 to the tubular portion 41 of the terminal 4 and connect the battledore 42 of the terminal 4 to the single pole terminal block 21 for 60 mm ² . Therefore, as shown in FIGS. 1 and 2, a 100 mm ² aluminum conductor cable 3 can be connected to a 60 mm ² unipolar terminal block 21 via a terminal 4.

The terminal 4 may have a battledore 42 having a battledore type as described above, or may be a round type, a Y type, or the like.
Further, in the present embodiment, as shown in FIG. 4A, in the terminal 4, the battledore 42 for 60 mm ² is attached to the cylinder 41 for 100 mm ² , and the battledore 42 is 100 mm ^2. It is smaller than the battledore 42 (42A) for use. When this relatively small battledore 42 is made of aluminum, the conductivity of aluminum is only about 60% of that of copper as described above, so that the battledore 42 is too small to secure a sufficient energizing capacity. May not be possible.

Therefore, when the terminal 4 is configured as described above, it is desirable that at least the battledore portion 42 of the terminal 4 is made of copper, which has a higher conductivity than aluminum.
With this configuration, it is possible to secure a sufficient energization capacity even if the battledore portion 42 of the terminal 4 becomes relatively small as described above.

Further, the portion of the tubular portion 41 of the terminal 4 can also be formed of copper. In this case, the tubular portion 41 of the terminal 4 and the battledore portion 42 can be integrally molded with copper.
Although not shown, for example, by providing an appropriate shape and number of irregularities as serrations on the inner surface of the tubular portion 41, the conductor 31 of the aluminum conductor cable 3 is inserted into the tubular portion 41 of the terminal 4 and crimped. Since the unevenness bites into the conductor 31, the conductor 31 is prevented from coming off, the oxide film on the surface of the conductor 31 is destroyed, and the new surface inside the conductor 31 is exposed, so that a good electrical connection can be obtained. In some cases, the serrations are composed of separate parts. In this case, the conductor 31 is inserted and crimped with the serrations of the separate parts already inserted inside the terminals.

It is also possible to form the terminal 4 by forming the tubular portion 41 of the terminal 4 with aluminum and connecting the aluminum tubular portion 41 and the copper battledore 42.
With this configuration, it is possible to prevent contact corrosion of dissimilar metals between the tubular portion 41 of the terminal 4 and the aluminum conductor 31 of the aluminum conductor cable 3.

On the other hand, as shown in FIG. 5, FIG. 4 single-pole terminal block 21 for copper conductor cable 60 mm ² aluminum conductor cable 3 of 100 mm ² through a terminal 4 according to the present embodiment shown in (A) When they are connected to each other, the large tubular portions 41 for 100 mm ^{2 of} each terminal 4 are in close proximity to each other. Therefore, it is not possible to secure a sufficient distance between the cylinders 41, and in some cases, a short circuit may occur.
Further, when the tubular portions 41 are in close proximity to each other, a space for insulating treatment is provided by covering the mounting portions of the aluminum conductor cable 3 and the terminal 4 with an insulating cap 6 (see FIG. 2) or wrapping an insulating tape. It will not be possible to secure it.

Therefore, in the present invention, as shown in FIGS. 1 and 2, the spacer 5 is arranged between the unipolar terminal blocks 21, and the unipolar terminal block 21 sandwiches the spacer 5. Are arranged side by side to form the terminal block 2.
Like the terminal block 2, the spacer 5 can be made of an insulating material such as plastic or ceramic, or can be made of rubber or the like.

With this configuration, for example, as in the present embodiment, the battledore 42 of the plurality of terminals 4 to which the aluminum conductor cable 3 of 100 mm ² is attached to the cylinder 41 is a unipolar terminal for a copper conductor cable of 60 mm ^2. Even in the case of connecting to the base 21, as can be seen by comparing FIGS. 1 and 5, by arranging the spacer 5 between the unipolar terminal blocks 21, the tubular portions 41 of each terminal 4 are connected to each other. The distance between the two is widened by the amount of the spacer 5, and it is possible to secure a sufficient distance between the tubular portions 41.

Since the distance between the cylinders 41 can be sufficiently secured in this way, it is possible to prevent a short circuit from occurring between the terminals 4. Further, since it is possible to perform an insulating treatment by covering the mounting portion of the aluminum conductor cable 3 and the terminal 4 with an insulating cap 6 or wrapping an insulating tape, a problem such as a short circuit between the terminals 4 may occur. Can be reliably prevented.

In order to further ensure the electrical insulation between the tubular portions 41 of the terminals 4, for example, as shown in FIG. 6, the terminals 4 connected to the unipolar terminal block 21 from each spacer 5 respectively. It is also possible to arrange the insulating plate 51 so as to extend in the region between the tubular portions 41 of the above.
With this configuration, since the insulating plate 51 exists between the cylinders 41 of the terminals 4, conductive foreign matter, dust, and the like cannot enter between the cylinders 41. Therefore, it is possible to prevent a short circuit due to foreign matter, dust, or the like, and it is possible to further ensure electrical insulation between the tubular portions 41 of the terminals 4.

It is desirable that the insulating plate 51 is arranged so that the distances from the tubular portions 41 on both sides thereof are substantially equal to each other.
Further, as shown in FIG. 6, if the insulating plate 51 is integrally formed with the spacer 5, the insulating plate 51 does not need to be attached to the spacer 5 at the work site where the aluminum conductor cable 3 is connected to the terminal block 2. Because it improves, work efficiency improves.

On the other hand, in order to make it easy to attach the insulating plate 51 to the spacer 5 at a work site or the like, for example, as shown in the enlarged view of FIG. 7, the spacer 5 and the insulating plate 51 A groove 5A is provided on the end surface of the spacer 5, and a convex portion 5B that fits with the groove 5A is provided on the end of the insulating plate 51. Then, the convex portion 5B of the insulating plate 51 may be slid and fitted into the groove 5A of the spacer 5, so that the insulating plate 51 can be attached to the spacer 5.

As described above, according to the connection structure 1, the terminal block 2 and the terminal 4 of the aluminum conductor cable according to the present embodiment, the conductor 31 of the aluminum conductor cable 3 has a size smaller than the size of the conductor 31. The aluminum conductor cable 3 is connected to the unipolar terminal block 21 by attaching the terminal 4 having the wing plate portion 42 of the size of the above and connecting the wing plate portion 42 of the terminal 4 to the unipolar terminal block 21. ..
A plurality of unipolar terminal blocks 21 are arranged side by side to form the terminal block 2, and the spacer 5 is arranged between the unipolar terminal blocks 21.

As described above, even when the copper conductor cable is replaced with a large aluminum conductor cable 3 having an energizing capacity equal to or larger than the energizing capacity and connected to the terminal block 2, the smaller size copper before the replacement is used as the terminal block 2. It becomes possible to use the terminal block 2 for the conductor cable.
Therefore, even when the copper conductor cable is replaced with a large aluminum conductor cable 3, it is not necessary to replace the distribution board or distribution board with a larger one, and the distribution board or distribution board for the copper conductor cable can be used as it is. It becomes.

As shown in FIG. 1 and the like, when the spacer 5 is arranged between the unipolar terminal blocks 21, the width of the terminal block 2 (see FIG. 5) is wider than that in the case where the spacer 5 is not arranged (see, for example, FIG. 5). The length of the terminal block 2 in the left-right direction in the first magnitude is increased by the amount of the spacer 5, but the depth of the terminal block 2 (the length in the vertical direction of the terminal block 2 in FIG. 1 etc.) does not change.
In many cases, the distribution board, distribution board, or the like is provided with a space in which the unipolar terminal block 21 can be added when the number of electric wires / cables connected to the terminal block 2 increases. .. Therefore, even if the spacer 5 is arranged between the unipolar terminal blocks 21 as described above and the width of the terminal block 2 becomes large, the terminal block 2 can be attached to the switchboard, distribution board, or the like. A switchboard or distribution board for a copper conductor cable can be used as it is.

Further, when the aluminum conductor cable 3 having a large size is connected to the terminal block 2 (single pole type terminal block 21) for the copper conductor cable having a small size, the tubular portion 41 of the terminal 4 attached to the aluminum conductor cable 3 as described above is connected. In some cases, the cylinders 41 are in close proximity to each other, making it impossible to secure a sufficient distance between the cylinders 41 (see FIG. 5).
However, according to the connection structure 1, the terminal block 2, and the terminal 4 of the aluminum conductor cable according to the present embodiment, since the spacer 5 is arranged between the unipolar terminal blocks 21, each of them is simple. The distance between the cylinders 41 of the terminals 4 is widened by the amount of the spacer 5, and the distance between the cylinders 41 can be sufficiently secured.

Therefore, it is possible to prevent a short circuit from occurring between the terminals 4.
Further, since it is possible to perform an insulating treatment by covering the mounting portion of the aluminum conductor cable 3 and the terminal 4 with an insulating cap 6 or wrapping an insulating tape, a problem such as a short circuit between the terminals 4 may occur. Can be reliably prevented.

In addition, in FIG. 1 and the like, in order to make the figure easier to see, the case where the aluminum conductor cable 3 is connected only to one side (the front side in the drawing) of the unipolar terminal block 21 is shown. A copper conductor cable or an aluminum conductor cable is also connected to the opposite side (back side in the drawing) of the terminal block 21.
Further, it goes without saying that the present invention is not limited to the above-described embodiments and the like, and can be appropriately modified as long as the gist of the present invention is not deviated.

For example, in the above embodiment, the case where the 60 mm ² copper conductor cable is replaced with the 100 mm ² aluminum conductor cable has been described, but the present invention is not limited to this case.
For example, when replacing a 600V copper conductor cable (Cu-CVT) with an aluminum conductor cable (AL-CVT), as shown in the table of FIG. 8, it is usually replaced with an aluminum conductor cable one to two sizes larger than the copper conductor cable. .. Then, the present invention can be applied to any of such replacements.

1 Connection structure of aluminum conductor cable to terminal block 2 Terminal block 3 Aluminum conductor cable 4 Terminal 5 Spacer 21 Single-pole terminal block 31 Conductor 41 Tube 42 Feather plate 51 Insulation plate

Claims (6)

In the connection structure of the aluminum conductor cable to the terminal block,
A terminal having a wing plate portion having a size smaller than the size of the conductor is attached to the conductor of the aluminum conductor cable, and the wing plate portion of the terminal is connected to a unipolar terminal block to form the aluminum. The conductor cable is connected to the unipolar terminal block,
A plurality of the unipolar terminal blocks are arranged side by side to form the terminal block.
A structure for connecting an aluminum conductor cable to a terminal block, characterized in that a spacer is arranged between the unipolar terminal blocks. The structure for connecting an aluminum conductor cable to a terminal block according to claim 1, wherein at least the battledore portion of the terminal is made of copper. The aluminum conductor cable according to claim 1 or 2, wherein the spacer includes an insulating plate extending in a region between the tubular portions of the terminals connected to the unipolar terminal block. Connection structure to the terminal block. The structure for connecting an aluminum conductor cable to a terminal block according to claim 3, wherein the insulating plate is integrally formed with the spacer. A terminal block used for the connection structure of the aluminum conductor cable according to any one of claims 1 to 4 to the terminal block.
A terminal block characterized in that a plurality of the unipolar terminal blocks are arranged side by side and spacers are arranged between the unipolar terminal blocks. A terminal used in the connection structure of the aluminum conductor cable according to any one of claims 1 to 4 to the terminal block.
A terminal attached to the conductor of the aluminum conductor cable and provided with a battledore portion having a size smaller than the size of the conductor.

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