JP2000115978A - Joint for insulating tape wound cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint for insulating tape wound cable having high workability in forming the joint of an insulating tape layer, and capable of solving a problem of the directions of winding cable insulating tape and the joint insulating tape being reverse to each other. SOLUTION: A joint part insulating tape layer 7 is formed by winding joint part insulating tape 8 in a plurality of layers around the outer periphery of a conductor connecting part so as to form a spiral gap 4 between adjacent turns, form one turn gap 10 in orthogonal direction to the longitudinal direction of a cable at the end of the winding layer of the cable insulating tape 3 of the same layer, become reverse in winding direction to the winding layer of the cable insulating tape 3, and lap it on the outer periphery of the end part of the winding layer of the cable insulating tape 3 beneath a winding layer to be formed over a required length. Insulating sheets 14 closing one turn gap 10 are disposed respectively so as to spread across the end of the winding layer of the cable insulating tape 3 and the end of the winding layer of the joint of the insulating tape 8 which face each other through the one-turn gap 10 at the respective layers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an OF cable,
The present invention relates to a joint portion of an insulating tape-wound cable, such as an OF cable, a PGF cable, and a non-drain (ND) cable, in which a cable insulating tape is formed by winding a large number of layers of a cable insulating tape by a gap winding.

[0002]

2. Description of the Related Art FIG. 7 is a longitudinal sectional view showing the structure of a joint portion of a conventional cable of this type, and FIG. 8 is an upper and lower insulating tape layer of the conventional cable of this type. It is a side view which shows the structure of the winding layer of a tape.

[0003] A conventional insulating tape-wound cable 1 is a cable insulating tape 3 in which the outer periphery of a cable conductor 2 is impregnated with oil, and is wound in multiple layers (for example, a gap winding) so that a spiral gap 4 is formed between adjacent turns. Cable insulation tape layer 5 wound and oil-impregnated (several tens to 200 layers)
Are formed. The reason why the cable insulating tape layer 5 is formed by gap winding is that the insulating tape wound cable 1
Has the required flexibility. In this case, the cable insulating tape layer 5 is formed, for example, by winding several to 20 layers of the cable insulating tape 3 in the same direction, and forming the next few layers to about 20 layers by the cable insulating tape 3.
Are formed in the reverse direction, and this is repeated to form a required insulating thickness.

[0004] Such an insulating tape wound cable 1 is
At the connection end, as shown in FIG.
Are stripped off for each layer, and the end of the cable conductor 2 is exposed. Insulating tape wound cable 1 having such a structure
The cables adjacent to each other along the longitudinal direction are arranged such that the ends of the cable conductors 2 face each other in the same layer of the cable insulating tape layer 5 so that the winding directions of the cable insulating tapes 3 are the same. These matching cable conductors 2 are connected to one another at a conductor connection 6.

A joint insulating tape layer 7 impregnated with oil is formed on the outer periphery of the conductor connecting portion 6. As shown in FIG. 9, the joint insulating tape layer 7 is formed by forming a spiral gap 9 by gap-winding the joint insulating tape 8 impregnated with oil in the same direction as the winding direction of the cable insulating tape 3 of the same layer. 10A and 10B, the joint insulating tape 8 has a gap in a direction opposite to the winding direction of the cable insulating tape 3 of the same layer as shown in FIGS. In some cases, the spiral gap 9 is formed by winding a plurality of layers such that the spiral gap 9 is formed by winding.

As shown in FIG. 9, each layer of the joint insulating tape layer 7 in the former case of being wound in the same direction as the cable insulating tape layer 5 is formed of one layer of the cable insulating tape layer 5 on one side as shown in FIG. The one end of the joint insulating tape 8 is connected to the wound end of the joint insulating tape 8 so as to form a spiral gap 9 by gap winding, and the cable insulating tape layer 5 on the opposite side is formed.
It is formed so that the other end of the joint insulating tape 8 is connected to the wound end of the cable insulating tape 3 of one layer. The advantage of this type of joint insulating tape layer 7 is that there is no gap overlap between the gap of the lower layer and the gap of the upper layer.

As shown in FIGS. 10A and 10B, each layer of the joint insulating tape layer 7 in the latter case of being wound in the opposite direction to the cable insulating tape layer 5 is one of the cable insulating tape layers 5 on one side. After the wound end of the cable insulation tape 3 of the layer ends at an end face perpendicular to the longitudinal direction of the cable, a gap 10 of one turn perpendicular to the longitudinal direction of the cable is provided, and a joint insulation tape is formed. 8 starts at the end face perpendicular to the longitudinal direction of the cable, so that the spiral gap 9 is formed by the gap winding in the winding direction opposite to the winding direction of the cable insulating tape 3, and the lower cable As shown in FIG. 10 (B), a winding layer of the joint insulating tape 8 is provided by wrapping around the end of the winding layer of the insulating tape 3 over a required length L as shown in FIG. It is formed as a structure. The advantage of this type of joint insulating tape layer 7 is that when the joint insulating tape 8 is wound by a gap winding, a spiral gap 9 is formed on the end side of the joint insulating tape layer 7.
There is no need to adjust the gap width so that the gap width is not disturbed, and the workability of forming the joint insulating tape layer 7 is very good.

[0008]

However, the winding direction of the cable insulating tape 3 and the joint insulating tape 8
In the joint insulating tape layer 7 having the same winding direction, work is performed such that the ends of the joint insulating tape 8 are aligned with the ends of the cable insulating tape 3 at both ends in the longitudinal direction of the joint insulating tape layer 7 and connected. It is necessary for the user to perform the gap winding while sequentially adjusting the gap width of the helical gap 9, so that the joint portion insulating tape layer 7 usually includes several tens to 200 sheets, depending on the cable size.
It is difficult to ensure the uniformity of the gap width of the spiral gap 9 over all the layers, and the gap width of the spiral gap 9 at the longitudinal end of the joint insulating tape layer 7 as shown in FIG. Disturbance occurs, that is, a portion where the gap width of the spiral gap 9 is widened at the longitudinal end portion of the joint portion insulating tape layer 7, and this portion becomes an electrical weak point of the joint portion insulating tape layer 7. there were.
Further, as described above, the operator spirally connects the ends of the joint insulating tape 8 to the ends of the cable insulating tape 3 at both ends in the longitudinal direction of the joint insulating tape layer 7 for each layer. Since it is necessary to perform gap winding while sequentially adjusting the gap width of the gap 9, there is a problem that the work efficiency of forming the joint insulating tape layer 7 is extremely poor.

On the other hand, in the joint insulating tape layer 7 in which the winding direction of the cable insulating tape 3 and the winding direction of the joint insulating tape 8 are opposite to each other, when the gap winding of the joint insulating tape 8 of a certain layer is performed, the lower side is formed. As shown in FIG. 10B, the joint insulating tape 8 is wrapped around the end of the winding layer of the cable insulating tape 3 over a required length L as shown in FIG. 10 (B). Spiral gap 4 or one-turn gap 10 and upper layer spiral gap 9 or one-turn gap 10
There is a problem in that the gap overlapping portions 11 and 12 overlap with each other, and the electrical insulation performance at these gap overlapping portions 11 and 12 is reduced, resulting in an electrical weak point of the joint insulating tape layer 7.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the problem of a type in which the winding direction of the cable insulating tape and the winding direction of the joint insulating tape are opposite to each other with good workability of forming the joint insulating tape layer. It is to provide a joint part of a cable.

Another object of the present invention is to provide a joint portion of an insulating tape wound cable which can easily improve an electric weak point in a gap overlapping portion where a gap between upper and lower layers overlaps.

Another object of the present invention is to provide a joint for an insulating tape-wound cable which can prevent the insulating sheet covering the gap overlapping portion where the gaps of the upper and lower layers overlap from moving during use without using an adhesive. To provide a department.

[0013]

According to the present invention, a cable insulating tape is formed by winding a plurality of layers of a cable insulating tape around an outer periphery of a cable conductor in a gap winding so that a gap is formed between adjacent turns. At the connection end, the cable insulation tape layer is peeled off at each connection end to expose the end of the cable conductor, and the insulation tape wound cable having such a structure is adjacent to the cable in the longitudinal direction. The ends of the cable conductors are arranged facing each other such that the winding directions of the cable insulation tapes in the same layer of the cable insulation tape layer are the same, and these adjacent cable conductors are connected to each other at the conductor connection part. A joint insulating tape layer is formed on the outer periphery of the conductor connecting portion, and the joint insulating tape layer is formed on the outer periphery of the conductor connecting portion. A one-turn gap perpendicular to the longitudinal direction of the cable is wound at the end of the wound layer of the cable insulation tape of the same layer by gap winding so that the insulated tape forms a gap between adjacent turns. It is wound and wound in multiple layers by wrapping it around the end of the winding layer of the lower cable insulating tape over the required length. It is intended to improve the joint part of the insulating tape wound cable.

In the joint portion of the cable wound with the insulating tape according to the present invention, the end portion of the wound layer of the cable insulating tape facing each other with a one-turn gap orthogonal to the longitudinal direction of the cable in each layer. And the end of the winding layer of the joint insulating tape.
An insulating sheet for closing a gap between the turns is provided.

By arranging the insulating sheets for closing the one-turn gap perpendicular to the longitudinal direction of the cable as described above, the electrical insulation is provided at the intersection of the one-turn gap and the helical gap of the overlapping layer. A decrease in performance can be suppressed. Therefore, according to the present invention, it is possible to provide a joint portion of an insulating tape-wound cable that has good workability in forming a joint portion insulating tape layer and has good electrical performance.

Further, in the present invention, a joint portion formed by wrapping the outer periphery of the end portion of the winding layer of the lower cable insulating tape for a required length so as to be wound in the reverse direction to the winding direction of the lower winding layer. At the winding layer of the insulating tape,
Insulating sheets for closing the gap overlapping portions are arranged at the respective gap overlapping portions where the spiral gap of the winding layer of the joint insulating tape and the spiral gap of the winding layer of the cable insulating tape thereunder overlap. Is preferred. With this configuration, the gap overlapping portions where the spiral gap of the winding layer of the joint insulating tape overlaps the spiral gap of the winding layer of the cable insulating tape immediately below can also be closed with the insulating sheet. It is possible to suppress a decrease in the electrical insulation performance at the overlapping portion. In addition, by using both the first and second aspects, all the points of electrical weakness in the joint insulating tape layer where the winding direction of the cable insulating tape and the winding direction of the joint insulating tape are opposite are improved. As a result, it is possible to provide a joint portion of an insulating tape-wound cable in which the workability of forming the joint portion insulating tape layer is good and the electrical performance is significantly improved.

Further, in the present invention, in each gap overlapping portion where the spiral gaps overlap, an insulating sheet for closing the gap overlapping portion with a size to close the portion is disposed in the circumferential direction, It is preferable that one-turn insulating sheets are arranged so as to close the gap. In particular, in the latter case, it is possible to prevent the insulating sheet closing the gap overlapping portion where the gap between the upper and lower layers overlaps during use from moving without using the adhesive.

In the present invention, the cable insulating tape, the joint insulating tape, and the insulating sheet for closing the gap overlapping portion are made of insulating paper such as kraft paper, polypropylene (PP), cross-linked polyethylene (XLPE), or fluorinated ethylene propylene. Semi-synthetic paper in which insulating paper such as kraft paper is laminated on a plastic film such as unified (FEP), polypropylene (PP), cross-linked polyethylene (X
LPE), fluorinated ethylene propylene polymer (FEP)
And the like including a single plastic film.

[0019]

1 to 4 show a first example of an embodiment of a joint portion of an insulating tape-wound cable according to the present invention. FIG. 1 shows a joint of the insulating tape-wound cable of the present embodiment. FIG. 2 is a perspective view showing an example of a process of winding a joint insulating tape over a conductor connecting portion at a portion, and FIG. 2 shows a state where a joint insulating tape is wound over a conductor connecting portion at a joint portion of the insulating tape wound cable of the present example. Perspective view,
FIG. 3 is an explanatory view showing a process of winding the insulating sheet over the end of the winding layer of the cable insulating tape and the end of the winding layer of the joint insulating tape in the present embodiment, and FIG. 4 is a diagram showing the cable insulating tape in the present embodiment. FIG. 4 is a side view showing a state in which an insulating sheet is wound over an end of the winding layer of the joint portion and an end of the winding layer of the joint insulating tape.

In this embodiment, the insulating tape-wound cable 1 is
At the connection end, as shown in FIG. 7, the cable insulating tape layer 5 impregnated with oil is peeled off step by step to expose the end of the cable conductor 2 and the cable 1 having such a structure is exposed. In the same layer of the cable insulating tape layer 5, the cables adjacent to each other along the longitudinal direction have the same winding direction of the oil-impregnated cable insulating tape 3 so that the ends of the cable conductors 2 face each other. And a point that the adjacent cable conductors 2 are connected to each other at a conductor connection portion 6 and that the joint insulation tape 8 impregnated with oil on the conductor connection portion 6 is wound in the winding direction of the cable insulation tape 3. It is the same as the conventional case in that the joint insulating tape layer 7 impregnated with oil is formed by winding in the opposite direction.

In this embodiment, when the tape-shaped joint insulating tape 8 is wound on the conductor connecting portion at the joint of the cable 1 with the insulating tape, as shown in FIG. Using the tape pad 13,
The joint insulating tape 8 is wound in the opposite direction to the winding direction of the cable insulating tape 3 from both sides from the center of the section to be wound. At this time, the winding end of the winding layer of the cable insulating tape 3 on the side of the cable insulating tape layer 5 on both sides of the same layer as the layer formed by winding the joint insulating tape 8 is previously set to the cable insulating tape 3. Are cut obliquely so that they end at end faces perpendicular to the longitudinal direction of the cable.

At the winding end of the joint insulating tape 8, the winding end of the winding layer of the cable insulating tape 3 facing the same layer is perpendicular to the longitudinal direction of the cable as shown in FIG. The end of the joint insulating tape 8 is cut obliquely so as to be opposed to each other with a gap 10 of one turn so as to end at an end face perpendicular to the longitudinal direction of the cable.

Each layer, or a part of the layer closer to the conductor, for example, 10 to 20 layers above the conductor, faces each other via a gap 10 of one turn orthogonal to the longitudinal direction of the cable. As shown in FIG. 3, one end of the turn of the winding layer of the cable insulating tape 3 of the same layer and the end of the winding layer of the joint insulating tape 8 spans both ends to close a gap 10 of one turn as shown in FIG. 3. The insulating sheets 14 are arranged inside and rolled in, respectively, to obtain the state shown in FIG. As the insulating sheet 14, an insulating sheet of the same material as the cable insulating tape 3 or the joint insulating tape 8 may be used, or an insulating sheet of a different material may be used. In some cases, it is used differently.

When the insulating sheets 14 for closing the one-turn gaps 10 orthogonal to the longitudinal direction of the cable are respectively arranged in this manner, the one-turn gaps 10 and the spiral gaps 4 of the layers overlapping therewith intersect. It is possible to suppress a decrease in the electrical insulation performance at the gap overlapping portion 12. Therefore, according to the present invention, it is possible to provide a joint portion of an insulating tape-wound cable which has good workability in forming the joint portion insulating tape layer 7 and also has good electrical performance.

FIG. 5 shows a second example of the embodiment of the joint portion of the cable wound with the insulating tape according to the present invention, wherein the end portion of the winding layer of the cable insulating tape of the same layer and the end portion of the winding layer of the joint portion insulating tape. Insulating sheet is wound on the gap, and the gap is overlapped with the spiral gap of the winding layer of the cable insulating tape immediately below it by the spiral gap of the winding layer of the joint insulating tape, and the gap is overlapped so as to be insulated. It is a side view showing the state where the sheet was rolled up and closed.

In this embodiment, the cable insulating tape 3 of the same layer is used.
At the point where the end of the winding layer of the joint insulating tape 8 and the end of the winding layer of the joint insulating tape 8 face each other via a one-turn gap 10 orthogonal to the longitudinal direction of the cable, This is the same as the first example in that the insulating sheet 14 that covers the one-turn gap 10 by wrapping over the end of the winding tape and the end of the winding layer of the joint insulating tape 8 is wound.

In this embodiment, the joint insulation formed by wrapping the outer periphery of the end portion of the winding layer of the lower cable insulating tape 3 for a required length so as to be wound in the reverse direction to the winding direction of the lower winding layer. At the location of the winding layer of the tape 8, each gap overlapping portion 11 where the spiral gap 9 of the winding layer of the joint insulating tape 8 and the spiral gap 4 of the winding layer of the cable insulating tape 3 immediately below overlap each other, The insulating sheets 15 are each partially arranged in the circumferential direction to have a size to cover the gap overlapping portions 11. Similarly to the insulating sheet 14, the insulating sheet 15 may be made of the same material as the cable insulating tape 3 and the joint insulating tape 8, or may be made of a different material. In some cases, the thickness is changed to make it thinner.

With such a structure, the gap overlapping portions 11 in which the spiral gap 9 of the winding layer of the joint insulating tape 8 and the spiral gap 4 of the winding layer of the cable insulating tape 3 immediately below overlap each other are also insulated. The sheet can be closed by the sheet 15, and it is possible to suppress the electrical insulation performance from being reduced at the gap overlapping portions 11. And one
The gap overlapping portion 12 where the gap 10 of the turn and the spiral gap 4 of the layer overlapping thereover intersects the insulating sheet 1.
By using in combination with the structure of closing the joint insulating tape 4, all points of electrical weakness in the joint insulating tape layer 7 in which the winding direction of the cable insulating tape 3 and the winding direction of the joint insulating tape 8 are opposite to each other are improved. It is possible to provide a joint portion of an insulating tape wound cable in which the workability of forming the insulating tape layer 7 is good and the electrical performance is significantly improved.

FIG. 6 is a side view showing a third embodiment of the joint portion of the insulating tape wound cable according to the present invention.

This example shows a modification of the second example.
In the joint portion of the insulating tape wound cable of this example, each gap overlapping portion 11 in which the spiral gap 9 of the winding layer of the joint insulating tape 8 and the spiral gap 4 of the winding layer of the cable insulating tape 3 immediately below overlap. At
One-turn insulating sheets 15 are respectively arranged so as to cover the portions.

When the one-turn insulating sheet 15 is used as described above, it is possible to prevent the insulating sheet 15 from shifting during use even without bonding.

In the above example, the insulating sheet 14 is interposed between the gap overlapping portion 12 where the one-turn gap 10 and the lower spiral gap 4 overlapping the gap 10 intersect.
It is preferable that an insulating sheet 14 is also interposed between the gap overlap portion 12 where the one-turn gap 10 and the upper spiral gap 4 overlapping the gap 10 intersect. Further, the insulating sheet 15 is interposed between the gap overlapping portion 11 where the spiral gap 9 and the spiral gap 4 thereunder overlap, but the spiral gap 9 and the spiral gap 4 thereabove are interposed.
It is preferable that the insulating sheet 15 is also interposed between the gap overlapping portions 11 where.

Further, in this embodiment, the cable insulating tape layer 5
The joint insulating tape layer 7 can be impregnated with insulating oil after drying after winding the tape. In any case, the spiral gap 4 and the spiral gaps 9 and 1
The gap 10 of the turn is impregnated with insulating oil.

[0034]

In the joint portion of the cable wound with the insulating tape according to the present invention, the ends of the wound layers of the cable insulating tape facing each other via a one-turn gap orthogonal to the longitudinal direction of the cable in each layer. Since the insulating sheets that cover the one-turn gap are disposed over the part and the end of the winding layer of the insulating tape of the joint part, the one-turn gap and the spiral gap of the layer overlapping therewith are arranged. Can be suppressed from deteriorating in the electrical insulation performance at the intersections of. Thus, according to the present invention,
It is possible to provide a joint portion of an insulating tape-wound cable that has good workability in forming the joint insulating tape layer and has good electrical performance.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a process of winding a joint insulating tape on a conductor connecting portion in a first example of an embodiment of a joint portion of an insulating tape wound cable according to the present invention.

FIG. 2 is a perspective view showing a state in which a joint insulating tape is wound on a conductor connecting portion at a joint portion of the insulating tape wound cable of the present example.

FIG. 3 is an explanatory view showing a process of winding an insulating sheet across the end of the winding layer of the cable insulating tape and the end of the winding layer of the joint insulating tape in this example.

FIG. 4 is a side view showing a state in which the insulating sheet is wound over the end of the winding layer of the cable insulating tape and the end of the winding layer of the joint insulating tape in this example.

FIG. 5 is a second example of the embodiment of the joint portion of the insulating tape-wound cable according to the present invention, which straddles the end of the winding layer of the cable insulating tape of the same layer and the end of the winding layer of the joint insulating tape. The insulation sheet is rolled up, and the spiral gap of the winding layer of the joint insulating tape and the spiral gap of the winding layer of the cable insulating tape immediately below are overlapped with each gap overlapping portion, and the insulating sheet is closed. It is a side view showing the state where it was rolled up and closed.

FIG. 6 is a third example of the embodiment of the joint portion of the insulating tape-wound cable according to the present invention, which straddles the end of the winding layer of the cable insulating tape of the same layer and the end of the winding layer of the joint insulating tape. The insulation sheet is rolled up, and the spiral gap of the winding layer of the joint insulating tape and the spiral gap of the winding layer of the cable insulating tape immediately below are overlapped with each gap overlapping portion, and the insulating sheet is closed. It is a side view showing the state where it was rolled up and closed.

FIG. 7 is a longitudinal sectional view showing the structure of a joint portion of a conventional insulating tape wound cable of this type.

FIG. 8 is a side view showing the configuration of upper and lower winding layers of a cable insulating tape in a cable insulating tape layer of a conventional insulating tape wound cable of this type.

FIG. 9 is a side view showing a state in which a joint insulating tape is wound on a conductor connecting portion in the same direction as the winding direction of the cable insulating tape in a joint portion of a conventional insulating tape wound cable.

FIG. 10A is a side view showing a joint portion of a conventional insulating tape-wound cable, in which one layer of a joint insulating tape is wound on a conductor connecting portion in a direction opposite to a winding direction of the cable insulating tape; B) is a joint part of a conventional cable wound with an insulating tape, in which a joint insulating tape is placed on the conductor connecting part in a direction opposite to the winding direction of the cable insulating tape.
It is a side view which shows the state which laminated | stacked.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulated tape wound cable 2 Cable conductor 3 Cable insulating tape 4 Spiral gap 8 Joint part insulating tape 9 Spiral gap 10 One-turn gap 11, 12 Gap overlapping part 13 Tape pad 14, 15 Insulating sheet

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Shinichi Suzuki 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd. F-term (reference) 5G355 AA02 BA12 CA30 5G375 AA01 BA26 BB44 CB04 CB17

Claims (4)

[Claims] 1. An insulating tape-wound cable in which a cable insulating tape layer is formed by winding a large number of layers of a cable insulating tape around an outer periphery of a cable conductor by gap winding so that a gap is formed between adjacent turns. At the connection end, the cable insulation tape layer is peeled off for each layer to expose the end of the cable conductor, and the insulation tape wound cable having such a structure is adjacent to each other along the longitudinal direction with the cable insulation cable. The ends of the cable conductors are arranged facing each other so that the winding directions of the cable insulating tapes in the same layer of the tape layer are in the same direction, and these cable conductors adjacent to each other are connected to each other at a conductor connection portion. A joint insulating tape layer is formed on an outer periphery of the conductor connecting portion, and the joint insulating tape layer is formed on an outer periphery of the conductor connecting portion. At the end of the wound layer of the cable insulating tape of the same layer in a gap winding so that the joint insulating tape forms a gap between adjacent turns,
Winding of the cable insulating tape with a gap of one turn in a direction perpendicular to the longitudinal direction of the cable, in a direction opposite to the winding layer of the cable insulating tape, and immediately below the winding layer to be formed. In a joint portion of an insulating tape wound cable formed by being wound in a multi-layer by wrapping the end portion side of the layer over a required length, the one turn orthogonal to the longitudinal direction of the cable in each layer. The end of the winding layer of the cable insulating tape and the end of the winding layer of the joint insulating tape facing each other via the gap are provided with an insulating sheet that covers the one-turn gap over both. A joint portion of an insulating tape-wrapped cable, which is arranged respectively. 2. A cable is wound around the outer periphery of an end portion of a winding layer of the lower cable insulating tape for a required length so that the winding direction of the lower winding layer of the cable insulating tape is reversed. At the location of the winding layer of the joint insulating tape, at each gap overlapping portion where the spiral gap of the winding layer of the joint insulating tape and the spiral gap of the winding layer of the cable insulating tape immediately below overlap.
2. The joint portion of an insulating tape-wound cable according to claim 1, wherein an insulating sheet for closing the gap overlapping portion is disposed. 3. In each of the gap overlapping portions where the spiral gaps overlap, an insulating sheet for closing the gap overlapping portion with a size to cover the portion is partially arranged in the circumferential direction. The joint portion of the insulating tape-wrapped cable according to claim 2. 4. The insulating tape according to claim 2, wherein a one-turn insulating sheet is disposed at each of the gap overlapping portions where the spiral gaps overlap, so as to cover the gap overlapping portions. Joint of wound cable.