JP2013055771A - Ground wire lead-out part and power cable connection part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ground wire lead-out part capable of being easily and stably fixed to power cables in various sizes without the need of troublesome time and labor, improving workability and reducing costs, and a power cable connection part including the ground wire lead-out part.SOLUTION: A ground wire lead-out part 140 includes: a ground wire lead-out metal fitting 141 formed in a planar shape having a first surface 141A and a second surface 141B facing each other, provided to have certain length, and arranged such that a second surface side is along an outer periphery of an insulation sheath of the power cable; a ground wire connection conductor 142 for connecting the ground wire lead-out metal fitting 141 with an external ground wire; and a covering layer 161 for covering a part that needs to be covered. In the ground wire lead-out metal fitting 141, a shield conductor 112 is electrically connected to at least one of the first surface and the second surface at one end part in a direction along the axis of the power cable, and the ground wire connection conductor 142 is electrically connected to at least one of the first surface and the second surface at the other end part.

Description

  The present invention relates to a ground wire lead portion that electrically connects an external ground wire to a shield conductor derived from a shield layer of a power cable, and a power cable connection portion including the ground wire lead portion.

  As a ground wire lead-out portion that pulls out a ground wire from the power cable in the connection portion of the power cable, a structure disclosed in Patent Document 1 or Patent Document 2 is known.

12 and 13 are diagrams for explaining the structure of the ground wire lead-out portion disclosed in Patent Document 1. FIG.
FIG. 12 is a diagram showing a state in which the ground wire lead fitting is attached to the power cable, and (A), (B), and (C) in the figure are a perspective view, a longitudinal sectional view, and a side view, respectively.
FIG. 13 is a diagram showing an overall configuration of the ground wire lead portion.

  12 and 13, 1 indicates a power cable, 2 indicates a ground wire lead-out portion, 3 indicates a ground wire, 4 indicates a coating layer, and 5 indicates a seal layer.

The ground wire lead portion 2 includes a ground wire lead fitting 21 and a ground wire connecting conductor 22.
The ground wire lead fitting 21 has a concave surface 21a that is curved along the outer periphery of the insulating sheath 1a of the power cable 1 as a part of the outer surface, and is formed on a convex surface 21b that has a curved outer surface at a portion facing the concave surface 21a. ing.
The ground wire lead 21 is disposed in the vicinity of the lead-out portion 1c of the shield conductor 1b of the power cable 1 with the concave surface 21a in contact with the outer periphery of the insulating sheath 1a of the power cable 1 via the seal layer 5. In the example of the figure, the shield conductor 1b taken out from the power cable 1 is attached to the crimp terminal 23 and fixed to the step portion 21c formed on one end side of the convex surface 21b.
A shield conductor 1 b led out from the shielding layer of the power cable 1 is electrically connected to one end side of the ground wire lead 21. Specifically, a crimp terminal is attached to the shield conductor 1b, and the shield conductor 1b is electrically connected to one end side of the ground wire lead 21 by fixing the crimp terminal to the ground wire lead 21 with a bolt. Connected.
One end of a ground wire connecting conductor 22 is connected to the other end side of the ground wire lead 21. Specifically, the ground line connection conductor 22 is press-fitted into a hole formed in the other end of the ground line lead fitting 21, or the ground line connection conductor is fixed to the fitting 21 with a bolt attached to a crimp terminal. The ground line 3 is connected to the other end of the ground line connection conductor 22.

The connection portion of the power cable including the outer surface near the shield conductor lead-out portion 1c of the power cable 1 from one end side of the ground wire lead-out fitting 21 of the ground wire lead-out portion 2 is covered all at once with the covering layer 4.
The covering layer 4 and the ground wire lead fitting 21 provide water shielding between the shield conductor lead-out portion 1c side region of the power cable 1 and the ground wire 3 side region.

  In the ground wire lead-out portion disclosed in the other patent document 2, the shield conductor led out from the shielding layer of the power cable is attached to one end of the lead bar with a crimp terminal, and the ground wire is connected to the other end. The lead bar is covered with a covering material having insulating properties throughout.

JP 2009-95226 A JP 2007-318945 A

As described above, the ground wire lead fitting 21 used for the ground wire lead portion 2 disclosed in Patent Document 1 has a mountain shape.
Accordingly, the cross-sectional shape of the ground wire lead-out portion 2 is substantially oval, and it is difficult to apply the pressure of the tape to be wound around to fix the ground wire lead-out fitting 21 to the outside of the coating layer 4. It is difficult to mount stably. For this reason, the efficiency of the work of forming the ground wire lead-out portion 2 is reduced, and a large amount of material such as tape is used to form this portion, resulting in a cost increase.
Furthermore, in the conventional ground wire lead portion, it is necessary to prepare the ground wire lead fitting 21 for each cable size, which requires many types of parts and is complicated.

  For this reason, it is difficult to stably attach the ground wire lead fitting to the insulating sheath of the cable.

  In the ground wire lead-out portion disclosed in Patent Document 2, it is not easy to stably fix the long lead bar to the insulating sheath of the power cable having a circular cross section, and the side face of the ground wire lead-out portion is waterproof. There is difficulty in processing.

  The present invention provides a ground wire lead-out portion and a power cable connecting portion including the same that can be easily shared with various sizes of power cables without requiring troublesome work, and can improve workability and reduce costs. There is to do.

The ground wire lead portion according to the first aspect of the present invention is a ground wire lead portion that electrically connects an external ground wire to a shield conductor led out from the shielding layer of the power cable, the first surface and A grounding wire that is formed in a flat plate shape having a second surface, has a certain length in the direction along the axis of the power cable, and is arranged so that the second surface side is along the outer periphery of the insulating sheath of the power cable. A lead wire fitting, a ground wire connection conductor for connecting the ground wire lead wire fitting and the external ground wire, and a coating layer covering a required covering portion, and the ground wire lead fitting is attached to the axis. The shield conductor is electrically connected to at least one of the first surface and the second surface at one end along the direction, and the ground is connected to at least one of the first surface and the second surface at the other end. The wire connecting conductor is electrically connected and the sheath , It said at least a portion of the outer surface of the ground wire outlet fitting, collectively covering the main cover portion including an outer surface in the vicinity of the shield conductor lead-out portion of the power cable.
Since the ground wire lead-out fitting has a flat plate shape, the ground wire lead portion can be bent in accordance with the outer surface of the power cable, and can be shared by power cables of different sizes.

  Preferably, the ground wire lead metal fitting is curved along the outer periphery of the power cable, and the ground wire connection conductor is formed of a flexible knitted conductor in which a conductor is knitted, One end portion is connected to the other end portion of the ground wire lead fitting in the width direction perpendicular to the axis of the ground wire lead fitting.

  The ground line connecting conductor may be connected to the first surface side of the ground wire lead fitting, or may be connected to the second surface side of the ground wire lead fitting.

  Preferably, the curvature of the second surface of the ground wire lead fitting is larger than the curvature of the outer periphery of the insulating sheath of the power cable, and the gap between the second surface of the ground wire lead fitting and the outer periphery of the insulating sheath is preferable. The ground line connecting conductor may be connected to the second surface so as to be sandwiched.

  Preferably, the ground wire lead fitting is curved along the outer periphery of the power cable, and the shield conductor is connected to the axis of the ground wire lead fitting at one end of the ground wire lead fitting. It is expanded and connected in the width direction orthogonal to the.

  The shield conductor may be connected to the first surface side of the ground wire lead fitting, or may be connected to the second surface side of the ground wire lead fitting.

  The grounding lead metal fitting is arranged such that a region to which the shield conductor is connected is disposed at a position where the outer semiconductive layer of the power cable is exposed, and the remaining region is opposed to the insulating sheath of the power cable. May be.

  You may electrically connect these by pulling up the grounding lead metal fitting and the shield conductor.

  Further, the ground wire lead fitting may be fixed to a cable by winding a roll spring.

  Further, a seal layer may be disposed between the second surface of the ground wire lead fitting and the insulating sheath of the power cable. The seal layer may be disposed at least in a region between a region to which the shield conductor is connected and a region to which the ground line connection conductor is connected.

  A power cable connecting portion according to a second aspect of the present invention includes a ground wire lead portion that electrically connects an external ground wire to a shield conductor derived from a shielding layer of the power cable, the cable connecting portion main body, and the ground A protective exterior portion having a water shielding structure that collectively covers the wire drawing portion, and the ground wire drawing portion is configured by a ground wire drawing portion having any one of the above-described configurations or a combination thereof. The protective exterior part includes the coating layer.

  According to the present invention, it is possible to easily and stably fix the ground wire lead fitting to various sizes of power cables without requiring troublesome work, thereby improving workability and reducing costs.

It is a perspective view which shows roughly the structural example of the principal part of the power cable connection part which concerns on the 1st Embodiment of this invention. It is a figure which expands and shows the structure of the principal part of the power cable connection part which concerns on this 1st Embodiment. It is a figure which shows roughly an example of a structure of the cable connection part main body which concerns on this embodiment. It is a side view which shows the grounding wire extraction part which concerns on the 1st embodiment. It is the enlarged front view which looked at the grounding wire extraction part of FIG. 4 in the arrow A direction in the figure. It is the expanded sectional view which looked at the part of the grounding wire extraction part in FIG. 2 along the XX line of the same figure. (A) And (B) is a figure for demonstrating how to set the curvature radius of the 2nd surface of a grounding wire extraction | drawer metal fitting. It is a figure for demonstrating the example which connects a grounding wire connection conductor over the 1st surface and the 2nd surface. It is a figure for demonstrating the structure which connects a shield conductor directly to the shield conductor connection part of a fixed area | region by soldering etc. FIG. (A) is a perspective view showing a state in which a sealing layer is formed on the power cable prior to installing the ground wire lead fitting on the power cable, and (B) and (C) are respectively on the power cable. It is the upper side figure and side view which show the state which mounted | wore the grounding wire drawing | extracting metal fitting through the seal layer. (A) And (B) is a figure which shows the structure of the grounding wire extraction part which is the principal part of the power cable connection part which concerns on the 2nd Embodiment of this invention. (A)-(C) is a figure for demonstrating the structure of the ground wire extraction part disclosed by patent document 1, Comprising: It is a figure which shows the attachment state to a power cable with a ground wire extraction metal fitting. It is a figure for demonstrating the structure of the ground wire extraction part disclosed by patent document 1, Comprising: It is a figure which shows the structure of the whole ground wire extraction part.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First Embodiment>
FIG. 1 is a perspective view schematically showing a configuration example of a main part of a power cable connection unit according to the first embodiment of the present invention.
FIG. 2 is an enlarged view showing the configuration of the main part of the power cable connection unit according to the first embodiment.

As shown in FIG. 1, the power cable connection unit 100 according to the first embodiment includes a cable connection unit main body 130 that connects one power cable 110 to another power cable 120, and a ground wire lead-out unit 140. And a grounding wire 150 and a protective armor 160.
The ground wire lead-out portion 140 electrically connects the ground wire 150 to the shield conductor 112 derived from the shield layer of the specific power cable 110 out of the power cables 110 and 120 connected by the cable connection portion main body 130. This is the part that pulls out the ground wire (ground line) inside the cable.
The protective exterior portion 160 includes a ground wire lead-out portion 140, a cable connection portion main body 130, and a portion of a certain length near the cable connection portion main body 130 of the power cables 110 and 120 connected by the cable connection portion main body 130. It is comprised so that it may have a water-impervious structure in the part covered collectively.

In the present embodiment, the “specific power cable among the power cables connected by the cable connecting portion main body” is drawn from the shielding layer among the power cables connected by the cable connecting portion main body. This is a power cable on the side where the shield conductor is electrically connected to the ground line drawn out to the outside.
In the illustrated example, since the ground line is connected only to the power cable 110 among the power cables connected by the cable connection unit main body 130, the power cable 110 becomes a specific power cable. When a grounding wire is drawn out from the shielding layers of both of the power cables 110 and 120, both of the power cables 110 and 120 are specific power cables.

[Configuration example of the cable connection body]
FIG. 3 is a diagram schematically illustrating an example of the configuration of the cable connection unit main body 130 according to the present embodiment.

In the cable connecting portion main body 130, as shown in FIG. 3, the power cables 110 and 120 are stripped when they are connected to each other, and each portion constituting each is exposed by a predetermined length.
In the specific power cable 110 from which the ground line is drawn, the outer semiconductive layer 113, the insulator 114, and the conductor 115 are exposed by a predetermined length from the outermost insulating sheath 111, and the shield inside the insulating sheath 111 is exposed. The conductor 112 is drawn out to the outside.
In the power cable 120, the shielding layer 122, the external semiconductive layer 123, the insulator 124, and the conductor 125 are exposed from the insulating sheath 121 by a predetermined length.

The power cables 110 and 120 are arranged in a state where the conductors 115 and 125 are opposed to each other, and the conductors 115 and 125 are connected by a crimping sleeve or the like to form the conductor connection portion 200.
A rubber unit 210 is provided around the conductor connection portion 200. The rubber unit 210 insulates the connection portion of the power cables 110 and 120.

  In this example, the cable connecting portion main body 130 is configured by the conductor connecting portion 200 and the rubber unit 210.

  Note that the cable connection unit main body 130 of FIG. 3 shows an example thereof, and the configuration of the cable connection unit main body 130 that can be used in the present embodiment is not limited to the example of FIG.

[Configuration Example of Grounding Line Leading Unit 140]
Next, a specific configuration example of the ground wire lead-out portion 140 according to the first embodiment will be described with reference to FIGS.
FIG. 4 is a side view showing the ground wire lead part 140 according to the first embodiment. FIG. 5 is an enlarged front view of the ground wire lead portion of FIG. 4 as viewed in the direction of arrow A in the drawing.
FIG. 6 is an enlarged cross-sectional view of the portion of the ground wire lead-out portion 140 in FIG. 2 as viewed along the line XX in FIG.

The power cable 110 side from which the ground wire 150 is drawn is positioned near the shield conductor lead-out portion (the end portion of the insulating sheath 111 from which the shield conductor 112 is led) 116 of the power cable 110, and the characteristic portion of this embodiment A ground wire lead-out portion 140 is disposed.
And the protective exterior part 160 which consists of a material which has a water-blocking property is provided so that the cable connection part main body 130 and the ground wire drawing part 140 may be covered collectively.

As shown in detail in FIGS. 2 to 6, in the present embodiment, the ground wire lead portion 140 includes a ground wire lead fitting 141 made of a highly conductive metal such as copper.
The illustrated ground wire lead 141 has a certain length L1 (see FIG. 2) in the direction along the axis AX of the power cable 110.
Further, as shown in FIG. 5, the ground wire lead 141 is formed in a flat plate shape having a first surface 141A (convex surface side) and a second surface 141B (concave surface side) facing each other. The ground wire lead fitting 141 of the present embodiment is formed of a metal member such as copper that is curved along the outer periphery of the insulating sheath 111 of the specific power cable 110 that pulls out the ground wire.
The ground conductor 141 is electrically connected to the first surface 141A on the one end 1411 side in the longitudinal direction (the direction along the axis of the power cable 110) via a terminal.
The ground wire lead 141 is connected to the first surface 141A on the other end 1412 side in the longitudinal direction (the direction along the axis of the power cable 110) with one end of the ground wire connecting conductor 142 by soldering, silver brazing, or the like. Electrically connected.
In the present embodiment, the thickness of the ground wire lead 141 is set to a thickness of about 0.5 mm to 1 mm, for example.

In the first embodiment, as shown in FIGS. 2 to 4, the shield conductor 112 and the ground line connection conductor 142 are connected to the first surface 141A (the surface that becomes the outer surface side when attached) of the ground wire lead 141. Has been.
The shield conductor 112 is connected to a certain region 1413 of the one end portion 1411 of the ground wire lead 141. In this example, the shield conductor 112 is fixed with a bolt 144 via a terminal fitting 143. For example, as shown in FIG. 5, the terminal fitting 143 is formed such that the surface of the ground wire lead fitting 141 in contact with the first surface 141 </ b> A is curved along the outer periphery of the first surface 141 </ b> A.
The ground wire connecting conductor 142 is formed of a braided wire, and one end of the ground wire connecting conductor 142 is flattened and connected to the other end portion 1412 of the ground wire lead fitting 141. In this example, the fixed region 1414 is soldered in a state of being spread over the entire width direction of the ground wire lead 141.
The ground line connection conductor 142 may be connected so as to straddle the second surface 141B.

  The second surface 141B of the ground wire lead 141 is disposed in contact with the outer periphery of the insulating sheath 111 of the power cable 110 via the seal layer 170. The seal layer 170 functions as a water-impervious wall, and functions to prevent water from entering the power cable connecting portion from between the ground wire lead 141 and the power cable 110.

  The ground wire lead 141 has a function that can sufficiently supply the current required for the ground wire.

Here, the setting of the curvature radius of the second surface 141B of the ground wire lead 141 will be described.
FIGS. 7A and 7B are views for explaining how to set the curvature radius of the second surface 141B of the ground wire lead 141. FIG.
The radius of curvature of the second surface 141B of the ground wire lead 141 is the radius of curvature of the outer surface (surface on the second surface 141B side) of the seal layer 170 interposed between the second surface 141B and the insulating sheath 111 of the power cable 110. It is preferable to set it equal to or slightly larger than the radius of curvature of the outer surface of the seal layer 170.

When the curvature radius of the second surface 141B is smaller than the curvature radius of the seal layer 170, as shown in FIG. 7B, the second surface 141B is located between the portion near the center in the width direction and the seal layer 170. A gap g ′ having both ends in the width direction closed is formed.
Since the seal material does not enter the part where the gap g ′ is formed, this part becomes a weak point of the seal between the ground wire lead 141 and the power cable 110, and there is a risk of passing water.

If the radius of curvature of the second surface 141B and the radius of curvature of the outer surface of the seal layer 170 can be made equal, no gap is generated between the second surface 141B and the seal layer 170. However, it is difficult to make the thickness of the seal layer 170 exactly constant, and it is difficult to make the curvature radius of the second surface 141B exactly equal to the curvature radius of the outer surface of the seal layer 170.
Therefore, in practice, as shown in FIG. 7A, a slight gap g, g that opens outward is formed between both ends of the second surface 141B in the width direction and the seal layer 170. In addition, the radius of curvature of the second surface 141B is preferably set to be larger than the radius of curvature of the seal layer 170.
When the curvature radius of the second surface 141B is set larger than the curvature radius of the seal layer 170, the difference between the curvature radius of the second surface 141B and the curvature radius of the outer surface of the seal layer 170 does not exceed 2.0 mm. It is preferable to set.

  As shown in FIG. 7A, the gaps g, g formed between the second surface 141B and the seal layer 170 are opened outward at both ends in the width direction of the second surface 141B. Since it is easy to close the gaps g with a sealing tape or the like, it is possible to prevent the sealing performance between the ground wire lead 141 and the power cable from being impaired.

Further, as shown in FIG. 7A, the gaps g, g formed between the second surface 141B and the seal layer 170 are opened outward at both ends in the width direction of the second surface 141B. In this case, it is possible to adopt a configuration as shown in FIG.
That is, in the constant region 1414 on the other end portion 1412 side of the ground wire lead 141, the ground formed by a braided wire or the like, as will be described later, across the gaps g, g from the first surface 141A to the second surface 141B. It is also possible to arrange and connect the line connection conductor 142.
The connection of the ground line connection conductor 141 to the ground line lead fitting 141 can be performed by a connection method such as soldering or silver brazing, and the sealing property of the other end portion 1412 side of the ground line lead fitting 141 is improved. The connection of the ground line connection conductor 142 can be firmly and reliably stabilized while maintaining.

  When the tape is wound around the ground wire lead 141 and the power cable in a state where the ground wire lead 141 is installed on the power cable, near the both ends in the width direction of the ground wire lead 141 In order to prevent a large gap from being formed between the tape and the outer periphery of the power cable, the vicinity of both ends may be formed in a tapered shape.

In addition, since the grounding lead wire 141 according to the first embodiment is formed in a thin flat plate shape by a copper plate or the like, it has rigidity, but is deformed to some extent by a hand or a tool at a work site or the like. It is also possible.
Therefore, in the first embodiment, even if there is a slight difference between the radius of curvature of the second surface 141B of the ground wire lead 141 and the radius of curvature of the insulating sheath 111, the adjustment is easily made on the spot. (Correction) is possible.
Therefore, in the ground wire lead-out portion 140 of the first embodiment, it is not necessary to prepare the ground wire lead fitting 141 whose shape is changed for each cable size, and it can be made common, so it is necessary to take troublesome product management. Nor.
Further, in the ground wire lead-out portion 140, since the shape of the ground wire lead-out fitting 141 is a thin flat plate, the cross-section when attached to the power cable 110, that is, the cross-sectional shape of the ground wire connection portion 140 may be made substantially circular. This makes it easier to apply the pressure of the tape wrapped around the outside. As a result, there is an advantage that the grounding lead wire 141 can be stably fixed to the power cable 110 and the workability is greatly improved.
That is, the shape of the cross section when the ground wire lead fitting 141 of the ground wire lead portion 140 of the first embodiment is attached is almost a perfect circle, and the tape winding pressure is often applied to the whole, preventing collapse and the like. be able to.
In addition, since the ground wire lead metal main body is a thin flat plate, only a small amount of the material is required, and the cost can be reduced.

The shield conductor 112 led out from the power cable 110 is fixed to the outer periphery of the outer semiconductive layer 113 of the power cable 110 by a roll spring 145 wound around the outer semiconductive layer 113 (see FIG. 2).
As described above, the fixed region 1413 of the one end portion 1411 of the ground wire lead 141 is a shield conductor connecting portion for connecting the shield conductor 112.
A terminal fitting 143 attached to the tip of the shield conductor 112 led out from the shielding layer of the power cable 110 is connected to the shield conductor connecting portion by a bolt 144.

As shown in FIG. 9, the shield conductor 112 can be directly connected to the ground wire lead 141 by soldering with a solder SLD or the like.
In this case, since the ground wire lead fitting 141 according to the present embodiment is a thin flat plate, the tip of the shield conductor 112 is placed on the first surface 141A or the second surface 141B or both surfaces, It can be connected by soldering or silver brazing.
In consideration of winding a tape around the outside of the ground wire lead 141, it may be more appropriate to employ a method such as soldering.

Further, as shown in FIGS. 1 to 4, one end portion of the ground wire connecting conductor 142 is connected to the other end portion 1412 side of the ground wire lead 141 by soldering, silver brazing, or the like.
As the ground line connecting conductor 142, it is preferable to use a flexible conductor such as a flat knitted conductor or a braided wire.
A waterproof crimp terminal fitting 146 is connected to the other end of the ground wire connecting conductor 142, and a terminal fitting 147 (see FIG. 2) soldered to one end of the ground wire 150 to be drawn is crimped by a bolt 148 and a nut 149. It is connected to the terminal fitting 146.

Thus, in this embodiment, the crimp terminal fitting 146 is connected to the other end of the ground line connection conductor 142, and the ground line connection conductor 142 and the ground line 150 are connected via the crimp terminal fitting 146. .
However, without connecting the crimp terminal fitting to the ground wire connection conductor 142, the ground wire connection conductor 142 is connected to the ground wire or the ground wire connection conductor drawn from another power cable by a crimp sleeve or soldering. Anyway.
It is also possible to connect the ground wire 150 directly to the ground wire lead 141.

  In the first embodiment, the outer peripheral surface of the first surface 141A of the ground wire lead 141 may be subjected to a process such as dipping. If a flexible resin layer is formed on the first surface 141A of the ground wire lead 141 by dipping or the like, the adhesion with the shrinkable tube forming the coating layer described later is improved, and the water tightness of the cable connection portion is further improved. Can be increased.

In the first embodiment, a bare conductor (preferably a flat knitted conductor) is used as the ground line connecting conductor 142. However, the ground line connecting conductor 142 is an insulated wire (flexible) having an insulation coating on the outer periphery. Can also be formed.
In the case where an insulated wire is used as the ground line connection conductor 142, the insulation coating of the portion used for the electrical connection, that is, the portion connected to the ground wire lead 141, the portion connected to the ground wire 150, etc. By removing and leaving a portion of the insulating coating that is not used for electrical connection, only the portion from which the insulating coating has been removed can be wound with tape, and tape winding at other portions can be omitted.

[Description of seal layer]
As shown in FIG. 1 and FIG. 2, the ground wire lead 141 has the power cable 110 in a state where the second surface 141 </ b> B is in contact with the outer periphery of the insulating sheath 111 of the power cable 110 via the seal layer 170. It is installed in the vicinity of the shield conductor lead-out portion 116.

As shown in FIG. 10, the sealing layer 170 is preferably formed of an insulating sheet made of a sealing material having adhesiveness, flexibility, and / or elasticity. As the insulating sheet, an insulating putty sheet having adhesiveness is suitable.
As the insulating putty sheet, a sheet widely used for the purpose of sealing or the like at the power cable connecting portion can be used.

FIG. 10A is a perspective view showing a state in which a sealing layer is formed on the power cable prior to installing the ground wire lead fitting on the power cable, and FIGS. FIG. 6 is a top view and a side view showing a state in which a ground wire lead fitting 141 is placed on a cable 110 via a seal layer 170.
When arranging the ground wire lead 141 on the outer periphery of the power cable 110, first, as shown in FIG. 10A, rectangular insulation is provided at the place where the ground wire lead 141 on the outer periphery of the power cable 110 is placed. The sealing layer 170 which is a sheet is fixed using its adhesiveness.
Next, as shown in FIGS. 10B and 10C, the ground wire lead 141 is placed on the seal layer (insulating sheet) 170 in a state where the second surface 141 B is in contact with the seal layer 170. The ground wire lead fitting 141 is fixed to the seal layer 170 using the adhesiveness of the seal layer 170.
In this way, in the state where the ground wire lead-out fitting 141 is disposed, the insulating layer constituting the seal layer 170 is configured such that the peripheral portion of the seal layer 170 protrudes outward from the peripheral portion surrounding the second surface 141B of the ground wire lead-out fitting 141. Set the size of the sheet.

  After the ground wire lead 141 is installed on the power cable 110 as described above, the ground wire lead 141 and the surface of the seal layer 170 are formed over the entire peripheral edge surrounding the ground wire lead 141. It is also possible to affix a sealing tape having adhesiveness that adheres to the ground wire lead 141, fusion property that is fused to the seal layer 170, and filling property in the gap. Thereby, the space between the ground wire lead 141 and the surface of the seal layer 170 can be liquid-tightly sealed.

[Explanation about protective exterior part (coating layer)]
As shown in FIGS. 1 and 3, a protective sheath 160 is provided from the portion of the power cable 110 where the ground wire lead 141 is disposed to the portion of the cable insulation sheath 121 of the other power cable 120.
As shown in FIG. 2, the location where the ground wire lead 141 is installed includes at least a part of the outer surface of the ground wire lead 141 and the outer surface near the shield conductor lead-out portion 116 of the power cable 110. The covering portion is collectively covered with the protective exterior portion 160.
The protective armor 160 and the ground wire lead 141 provide water shielding between the region on the shield conductor lead-out portion 116 side of the power cable 110 and the region on the side from which the ground wire 150 is drawn.

  Here, the “covering section” is necessary to cover the area on the shield conductor section side of the boundary between the area on the side where the ground wire of the power cable is drawn out and the area on the shield conductor lead-out section side. There is a portion, and the range of the required coating portion is appropriately set.

Specifically, as shown in FIG. 2, the protective exterior portion 160 includes a cable connection portion main body 130, a large portion of the ground wire lead-out fitting 141 (most portion of the ground wire lead portion 140), and the cable connection portion main body 130. A covering layer 161 that collectively covers the portions of the power cables 110 and 120 that are connected to each other by a certain length over the cable insulation sheaths 111 and 112 is provided.
Further, the protective exterior portion 160 has a layer of waterproof tape 162 wound around the end portion of the covering layer 161, the outer periphery of the ground wire lead 141, and the outer periphery of the power cable 110. This is because the waterproof tape 162 prevents water from entering the coating layer from the end of the coating layer 161.
If possible, the waterproof tape 162 is preferably wound so as to include a region 1412 to which the ground wire connecting conductor 142 of the ground wire lead 141 is connected.
As the waterproof tape 162, it is preferable to use a self-bonding tape.

  The covering layer 161 is formed of a shrinkable tube having a water-blocking property. Function) forms a water-blocking structure of the protective exterior portion 160 (a structure that blocks water from entering from the outside).

  Note that taping or the like for forming a semiconductive layer or a shielding layer covering the cable connecting portion main body 130 is applied to the inside of the protective exterior portion 160, but the description thereof is omitted here.

  In the example shown in FIG. 2, the end portion of the covering layer 161 made of the shrinkable tube is terminated at a position before the other end portion 1412 of the ground wire lead 141, but as described above, the waterproof tape 162 is wound. It is also possible to bring the position of the end portion of the covering layer 161 close to the other end portion 1412 of the ground wire lead fitting within a range that does not interfere with the above.

As the shrinkable tube constituting the coating layer 161, a tube having shrinkability at room temperature or a tube that shrinks when heated (heat-shrinkable tube) is selected.
“Tubes that are shrinkable at normal temperature” are made of an elastic material, have an inner diameter that is smaller than the outer diameter of the required covering portion in a free state, are covered with the required covering portion, and have elasticity at room temperature due to their own elasticity. A typical example is a rubber tube.

  When the coating layer 161 is formed from a cold-shrinkable tube, the tube is covered with the necessary covering portion in a state where the diameter of the tube is expanded by an appropriate diameter expanding means, and then the diameter expanding means is removed from the tube. By shrinking the diameter, the tube is brought into intimate contact with the covering portion.

  In the present embodiment, for example, a branch unit can be provided in order to effectively waterproof the lead-out portion of the ground line connection conductor 142 and the lead-out portion of the power cable 110. However, the branch unit is selectively used according to the situation and is not an essential unit.

As described above, according to the first embodiment, the following effects can be obtained.
The ground wire lead-out portion 140 of the present embodiment has rigidity because the ground wire lead-out fitting 141 is formed in a thin flat plate shape with a copper plate or the like, but is deformed to some extent by hand or a tool at a work site or the like. It is also possible.
Therefore, in the first embodiment, even if there is a slight difference between the radius of curvature of the second surface 141B of the ground wire lead 141 and the radius of curvature of the insulating sheath 111, the adjustment is easily made on the spot. (Correction) is possible.
Therefore, according to the ground wire lead-out portion 140 of the first embodiment, it is not necessary to provide the ground wire lead-out fitting 141 having a different shape for each cable size, and it is not necessary to prepare various types of products, which is a complicated product. There is no need for management.
In addition, according to the ground wire lead-out portion 140 of the first embodiment, since the shape thereof is a thin flat plate shape, the cross section when the power cable is attached is substantially the same as the pressure of the tape wound around the outer side of the covering layer. It has a circular shape, can be stably fixed, and has an advantage that workability is greatly improved.
In other words, according to the first embodiment, the shape of the cross section when the ground wire lead-out portion 140 is attached is substantially a circle, and the tape winding pressure is applied to the entire body in the same manner to prevent the collapse and the like. be able to.
Further, according to the first embodiment, since the ground wire lead fitting main body is a thin flat plate shape, only a small amount of the material is required, and the cost can be reduced.

In addition, according to the first embodiment, the second surface 141B of the ground wire lead fitting 141 having a certain length L1 (a sufficient length for water shielding) L1 in the axial direction of the power cable 110 is used as the power. The outer periphery of the insulating sheath 111 of the cable 110 is brought into surface contact via a seal layer 170.
And the structure which connects the ground wire 150 and the shield conductor 112 derived | led-out from the shielding layer of the power cable 110 through this ground wire drawing | extracting metal fitting 141 is employ | adopted.
Therefore, since the ground wire lead 141 is in contact with the insulating sheath 111 of the power cable 110 over a wide area via the seal layer 170 to form a water shielding wall, the ground wire lead 141 is formed between the ground wire lead 141 and the power cable 110. It is highly possible to prevent water from entering the water.
Further, in the ground wire lead-out portion 140 of the present embodiment, the shrinkable covering layer 161 that collectively covers the required covering portions is provided on the outer surface of the ground wire lead-out fitting 141 having a much larger outer surface area than the ground wire. Since they are in contact with each other, it is possible to highly prevent water from entering the inside through the space between the coating layer 161 and the ground wire lead 141.
Therefore, according to the first embodiment, the area between the shield conductor lead-out portion side of the power cable 110 and the region from which the ground line is drawn can be highly sealed, and the ground wire lead-out portion 140 can be shielded from water. Performance can be improved.

Further, when configured as described above, the ground wire lead 141 having an outer surface sufficiently wider than the ground wire 150 faces the outer surface of the insulating sheath 111 of the power cable 110 and the covering layer 161 that covers the required covering portion. It can touch to prevent water blocking.
Therefore, according to the first embodiment, the water shielding function is achieved as compared with the case where the ground wire is directly drawn out between the outer surface of the insulating sheath 111 of the power cable 110 and the covering layer 161 that covers the required covering portion. The area of the portion can be greatly increased to improve the water shielding performance.

In the above embodiment, the seal layer 170 interposed between the second surface 141B of the ground wire lead 141 and the outer periphery of the insulating sheath 111 of the power cable 110 is formed of an insulating putty sheet having a certain thickness. However, the sealing layer may be formed of a material that is thinly applied by application, such as an adhesive.
In the above embodiment, the ground wire lead portion of the intermediate connection portion that connects the power cables is described. However, the ground wire lead portion 140 is connected to the terminal connection portion that connects the power device or the power transmission line and the power cable. It can also be applied.

<Second Embodiment>
FIGS. 11A and 11B are diagrams showing a configuration of a ground wire lead-out portion that is a main part of the power cable connection portion according to the second embodiment of the present invention. FIG. 11A is a side view schematically showing the ground wire lead portion according to the second embodiment. FIG. 11B is a cross-sectional view taken along line YY in FIG.

The ground wire lead portion 140A according to the second embodiment is basically different from the ground wire lead portion 140 according to the first embodiment as follows.
In the ground wire lead portion 140A according to the second embodiment, both the shield conductor 112 and the ground wire connection conductor 142 are connected to the second surface 141B side of the ground wire lead fitting 141, and the ground wire lead fitting 141 is an electric power. The cable 110 is disposed so as to face the insulating sheath 111 of the cable 110 across the outer semiconductive layer 113.

In the ground wire lead portion 140A, one end portion 1411 side to which the shield conductor 112 is connected is arranged so as to face the outer periphery of the external semiconductive layer 113 of the power cable 110 in the second surface 141B of the ground wire lead fitting 141. Yes.
The remaining area of the second surface 141B of the ground wire lead 141 is disposed so as to face the outer periphery of the insulating sheath 111 of the power cable 110.

In the second embodiment, a roll spring 145 that fixes the shield conductor 112 in contact with the outer periphery of the outer semiconductive layer 113 is attached to a position adjacent to the shield conductor lead-out portion 116 of the power cable 110. The roll spring 145 is made of copper.
The shield conductor 112 is folded back toward the shield conductor lead-out portion 116 so that the tip end portion overlaps the outer peripheral surface of the roll spring 145. A ground wire lead fitting 141 is attached so as to overlap the outer peripheral side of the folded shield conductor 112, and the shield conductor 112 is fixed between the second surface 141B and the roll spring 145. Next, one end side of the ground wire lead fitting 141 is tightened by the second roll spring 180 to firmly fix the ground wire lead fitting 141 to the power cable 110. The shield conductor 112 may be connected to the second surface 141B of the ground wire lead 141 by soldering or the like.

As described above, the ground line connecting conductor 142 is formed of a flexible knitted conductor (a flat knitted conductor or the like) in which a conductor is knitted.
One end of the ground wire connecting conductor 142 is connected to the second surface 141B of the other end 1412 of the ground wire lead 141.
In the second embodiment, the thickness of the portion of the ground wire connecting conductor 142 connected to the ground wire lead 141 is such that the second surface 141B of the ground wire lead 141 from the axis of the power cable 110 (axial center). The position (distance) is adjusted so as to be uniform both in the region where the ground line connecting conductor 142 is connected and in the region where the shield conductor 112 is connected.
In other words, the thickness of the ground wire connecting conductor 142 is adjusted so that the second surface 141B of the ground wire lead 141 is substantially parallel to the axis of the power cable 110.
This thickness adjustment can be performed by adjusting the amount of the braided conductor of the flexible ground line connecting conductor 142 and the amount of overlapping.

  The roll spring 180 is wound around the outer periphery of the ground wire lead 141 so as to include at least a region where the shield conductor 112 is connected.

  An adhesive putty sheet 171 as a seal layer is disposed between the central region of the second surface 141B of the ground wire lead 141 and the insulating sheath 111 of the power cable 110. Here, the central region is a region between a region where the shield conductor 112 is connected and a region where the ground line connecting conductor 142 is connected.

According to the second embodiment, in addition to the effects of the first embodiment described above, the following effects can be obtained.
By arranging the second surface 141B of the ground wire lead 141 so as to straddle the insulation sheath 111 of the power cable 110 and the outer semiconductive layer 113 of the next step, the step due to the stepping of the power cable 110 is used. It becomes possible to perform the connection processing of the shield conductor 112 that has been performed.
Further, in the ground wire lead 141, the first surface 141A located on the outer side has only the roll spring 180 as a protrusion, and the entire surface becomes a substantially smooth outer surface.
Accordingly, in the ground wire lead portion 140A of the second embodiment, the shrinkable coating layer 161 that collectively covers the required coating portion comes into high surface contact with the outer surface of the ground wire lead fitting 141. It is easy to prevent water from entering inside through between 161 and the ground wire lead 141.
In addition, since the cross-sectional shape of the ground wire lead-out portion 140A is close to a circle, a high pressure is applied even when a tape is wound around the end portion of the covering layer 161 for waterproofing, and collapse or the like can be prevented.
In this embodiment, the folded shield conductor 112 is connected to the second surface 141B side of the ground wire lead 141, but the folded shield conductor 112 can also be connected to the first surface 141A side.
Moreover, the ground wire lead 141 may be fixed to a portion where the insulating sheath 111 of the power cable 110 is provided using a roll spring at the center thereof.

DESCRIPTION OF SYMBOLS 100 ... Power cable connection part 110 ... Specific power cable from which a ground line is drawn out 111 ... Insulation sheath 112 ... Shield conductor 113 ... External semiconductive layer 114 ... Insulator 115 ... -Conductor 116 ... Shield conductor lead-out part 120 ... Other power cable 124 ... Insulator 125 ... Conductor 130 ... Cable connection part main body 140 ... Ground wire lead-out part 141 ... Ground 141A ... first surface 141B ... second surface 1411 ... one end portion 1412 ... other end portion 1413 ... constant area for connecting shield conductor 1414 ... ground wire connection Fixed region for connecting conductors 142... Ground wire connection conductor 145... Roll spring 150... Ground wire 160. 170 ... Seal layer (insulating sheet)
171: Putty sheet 180 ... Roll spring 200 ... Conductor connection part 210 ... Rubber unit 211 ... Reinforcement insulating layer 212 ... Internal semiconductive layer 213 ... External semiconductive layer 214, 215 ... Stress cone 300 ... Branch pipe unit 310 ... Cylinder part 320 ... First branch pipe part 330 ... Second branch pipe part

Claims (6)

A ground wire lead portion for electrically connecting an external ground wire to a shield conductor derived from the shielding layer of the power cable,
It is formed in a flat plate shape having first and second surfaces facing each other, has a certain length in a direction along the axis of the power cable, and the second surface side extends along the outer periphery of the insulating sheath of the power cable. A ground wire lead fitting placed in
A ground wire connecting conductor for connecting the ground wire lead fitting and the external ground wire;
A coating layer that covers the coating required portion,
The ground wire lead fitting is
The shield conductor is electrically connected to at least one of the first surface and the second surface at one end in the direction along the axis;
The ground line connection conductor is electrically connected to at least one of the first surface and the second surface of the other end,
The coating layer is
A ground wire lead portion that collectively covers a required covering portion including at least a part of the outer surface of the ground wire lead fitting and an outer surface near the shield conductor lead-out portion of the power cable. The ground wire lead fitting is
It is curved along the outer periphery of the power cable,
The ground wire connection conductor is:
It is formed of a flexible knitted conductor woven with a conductor, and one end portion of the knitted conductor is connected to the other end portion of the ground wire lead fitting in the width direction perpendicular to the axis of the ground wire lead fitting. The ground wire lead-out part according to claim 1. The shield conductor is
The ground wire lead portion according to claim 1 or 2, wherein the ground wire lead portion is folded and connected to the ground wire lead metal fitting. The ground wire lead-out part according to any one of claims 1 to 3, wherein a roll spring is wound around the ground wire lead-out fitting. A seal layer is disposed at least in a region between the second surface of the ground wire lead fitting and the insulating sheath of the power cable except for a region where the shield conductor and the ground wire connection conductor are connected. The ground wire lead-out part according to any one of claims 1 to 4. A cable connection body connecting the power cable to another power cable; and
A ground wire lead portion for electrically connecting an external ground wire to the shield conductor derived from the shield layer of the power cable;
A protective exterior part of a water shielding structure that collectively covers the cable connecting part main body and the ground wire lead part,
The ground wire lead portion is
A power cable connecting portion configured by the ground wire lead-out portion according to any one of claims 1 to 5.

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