JP2000245047A - Termination section of insulated power cable - Google Patents

Abstract

(57) [Problem] To provide a terminal processing part of an insulated power cable capable of maintaining airtightness and liquid tightness at a place where a ground connection conductor is drawn out without winding a self-fusing tape. SOLUTION: An end portion 1 of an insulated power cable is stepped and a metal shielding tape layer 3, an outer semiconductive layer 4, a cable insulating layer 5, and a cable conductor are sequentially exposed from a cable sheath 2. The connection terminal 6 is connected to the exposed cable conductor. An insulating rubber sleeve 7 is fitted over the end portion of the cable sheath 2 and the base between the connection terminals 6 so as to cover the space therebetween. A grounding clamp 11 is provided closely on the outer periphery of the metal shielding tape layer 3, and the grounding clamp 11 penetrates a through hole 12 formed in the peripheral wall of the insulating rubber sleeve 7 and is led out of the insulating rubber sleeve 7. 13 is provided, and a fastening member 14 for fastening the insulating rubber sleeve 7 to the ground connection conductor 13 between the grounding clamp 11 and the insulating rubber sleeve 7 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal section of a rubber or plastic insulated power cable such as a crosslinked polyethylene insulated power cable.

[0002]

2. Description of the Related Art FIG. 6 shows a terminal processing section of an insulated power cable of this kind. In the terminal processing section of the insulated power cable shown here, the end of the insulated power cable 30 is stripped and the metal shielding tape layer 32, the external semiconductive layer 33, and the cable insulating layer 3 are separated from the cable sheath 31.
4. The cable conductors (not shown) are sequentially exposed, and the connection terminals 35 are connected to the exposed cable conductors. The insulating rubber sleeve 36 extends over the distal end of the cable sheath 31 and the base of the connection terminal 35 and covers a portion therebetween.
Are air-tightly and liquid-tightly fitted.

[0003] The base end side of a ground connection conductor 37 formed of a bendable ground line is bound to the metal shielding tape layer 32 and electrically and mechanically connected. The front end side of the ground connection conductor 37 is an insulating rubber sleeve. The cable 36 extends from the cable insertion opening 39 to the outside of the insulating rubber sleeve 36 between the cable insertion opening side base end 38 and the cable sheath 31. A self-sealing tape layer 40 is provided on the outer periphery of the cable sheath 31 between the base end 38 of the insulating rubber sleeve 36 and the cable sheath 31 so that the waterproof property is not impaired at the lead-out portion of the ground connection conductor 37. Through the self-fusing tape layer 40 in an airtight and liquid tight manner.
Is derived outside. The proximal end portion 38 of the insulating rubber sleeve 36 is tightly and airtightly fastened by a fastening tool 41 such as a fastening band.

[0004] As another terminal processing section of another insulated power cable, the one shown in FIG.
No.-93991). In the terminal processing section of the insulated power cable shown here, the ground plate 42 is fixed to the metal shielding tape layer 32 where the end of the insulated power cable 30 is stripped and exposed, and the end of the insulated power cable 30 is A ground connection conductor 37 made of a ground wire is hermetically inserted and held in a through hole 43 provided in the insulating rubber sleeve 36 that covers the ground, and a ground plate 42 fixed to the ground connection conductor 37 and the metal shielding tape layer 32. Are connected via a lead wire 44,
The base end 38 of the insulating rubber sleeve 36 on the cable insertion opening side is fastened with a fastener 41.

[0005]

However, in the terminal processing section of the insulated power cable shown in FIG. 6, the winding of the self-fusing tape forming the self-fusing tape layer 40 and the ground connection conductor 37 are shifted. As a result, there is a problem that airtightness and liquid tightness cannot be maintained. In addition, depending on the skill of the worker who forms the self-fusing tape layer 40, airtightness and
There is a problem in that a difference in liquid-tight performance appears, and it is difficult to obtain a stable terminal processing unit.

In the terminal processing section of the insulated power cable shown in FIG.
The airtightness between the ground connection conductor 37 and the insulating rubber sleeve 36 which are inserted through the airtight seal 3 is achieved by pressing the inner surface of the through hole 43 against the outer surface of the ground connection conductor 37 by utilizing the contraction elasticity of the through hole 43. However, there is a problem that the sealing performance is not sufficient, and the hermeticity cannot be maintained in some cases.

An object of the present invention is to provide a terminal processing part of an insulated power cable which can maintain airtightness and liquid tightness at a place where a ground connection conductor is drawn out without winding a self-fusing tape. It is another object of the present invention to provide a terminal processing unit of an insulated power cable which can maintain airtightness and liquid tightness at a place where a ground connection conductor is drawn out without being affected by a difference in skill of an operator. Another object of the present invention is to provide a terminal processing unit of an insulated power cable that can easily and electrically connect a ground connection conductor to a metal shielding tape layer without individual differences. It is another object of the present invention to provide a terminal processing unit of an insulated power cable that can easily mount a grounding clamp on an outer periphery of a metal shielding tape layer. Another object of the present invention is to provide a terminal processing part of an insulated power cable which can easily maintain airtightness and liquid tightness at a place where a bolt as a ground connection conductor penetrates an insulating rubber sleeve without requiring skill. It is in.

[0008]

Means for Solving the Problems To solve the above problems,
The configuration of the present invention for achieving each of the above objects will be described as follows. According to the first aspect of the present invention, the end of the insulated power cable is stepped off, and a metal shielding tape layer, an external semiconductive layer, a cable insulating layer,
A cable conductor is sequentially exposed, a connection terminal is connected to the exposed cable conductor, an insulating rubber sleeve is fitted over the distal end of the cable sheath and a base of the connection terminal, and the metal shielding tape is provided. In the terminal processing section of the insulated power cable in which the ground connection conductor connected to the layer is led out of the insulating rubber sleeve, a ground clamp is provided in close contact with the outer periphery of the metal shielding tape layer, and the ground clamp is provided on the ground clamp. Is provided with a ground connection conductor that extends through a through hole formed in the peripheral wall of the insulating rubber sleeve and is led out of the insulating rubber sleeve. A fastening member for fastening between them is provided.

As described above, the grounding clamp provided on the outer periphery of the metal shielding tape layer is provided with the grounding connection conductor which extends through the through hole formed in the peripheral wall of the insulating rubber sleeve and is led out of the insulating rubber sleeve. Since it is provided, an operation requiring skill such as forming a self-sealing tape layer in a gas-tight and liquid-tight manner on the outer periphery of the cable sheath between the base end of the insulating rubber sleeve and the cable sheath as in the related art. Becomes unnecessary. Since the grounding connection conductor is provided with a fastening member for fastening the insulating rubber sleeve between the grounding clamp and the grounding clamp, the simple operation of fastening the insulating rubber sleeve with the fastening member enables the insulating rubber sleeve to be used. Air-tightness and liquid-tightness at a portion where the ground connection conductor penetrates can be reliably obtained.

According to a second aspect of the present invention, the grounding clamp according to the first aspect is provided integrally with the clamp body fixedly attached to the outer periphery of the metal shielding tape layer, and the insulating clamp is provided with the insulating body. It is characterized by comprising a spacer that supports the periphery of the through hole on the inner surface of the rubber sleeve and is provided with the ground connection conductor.

As described above, since the spacer is integrally provided on the clamp body, even if the insulating rubber sleeve is tightened by the tightening member provided on the ground connection conductor provided on the spacer, the insulating rubber sleeve and the insulating rubber sleeve are insulated by the spacer. The space between the metal shielding tape layer and the external semiconductive layer in the rubber sleeve is maintained.

According to a third aspect of the present invention, the ground connection conductor according to the second aspect is formed of a conductive bolt, and the bolt is electrically and mechanically connected to the spacer in a direction orthogonal to the ground clamp. It is characterized by being.

As described above, since the ground connection conductor is formed of a conductive bolt, it is easy to provide a fastening member.

According to a fourth aspect of the present invention, the bolt serving as the ground connection conductor according to the third aspect is fixed to the spacer, and packing is provided around the bolt at a location where the bolt penetrates the insulating rubber sleeve. Are disposed so as to be in contact with the inner surface and the outer surface of the insulating rubber sleeve, and the bolt serves as a tightening member for tightening the insulating rubber sleeve via the outer and inner packings between the spacer and the spacer. The nut is screwed.

With this configuration, by tightening the nut screwed to the bolt, the inner and outer surfaces of the insulating rubber sleeve are inserted between the spacer and the nut via the packing via the packing. It is tightened, and airtightness and liquid tightness at the same location can be reliably obtained.

According to a fifth aspect of the present invention, the bolt serving as the ground connection conductor according to the third aspect is detachably screwed into a screw hole formed in the spacer, and the bolt is provided on the outer periphery of the bolt. A packing is disposed so as to be in contact with the inner surface and the outer surface of the insulating rubber sleeve at a point penetrating the insulating rubber sleeve, and the bolt is provided between the spacer and the spacer through the outer and inner packings. And a flange serving as a fastening member for fastening the insulating rubber sleeve.

[0017] With this configuration, the bolt is screwed into the screw hole formed in the spacer, so that the inner and outer surfaces of the insulating rubber sleeve are connected to the spacer through the packing via the packing. It is tightened between the flange provided on the bolt and airtightness and liquid tightness at the same location can be reliably obtained. Also, in this configuration,
After the insulating rubber sleeve is fitted to the end of the insulated power cable, the bolt is inserted into the through hole formed in the insulating rubber sleeve and screwed into the screw hole of the spacer. When fitting the insulating rubber sleeve,
Since only the height of the spacer protrudes in the outer peripheral direction from the insulated power cable, the insulating rubber sleeve can be easily fitted.

[0018] The invention according to claim 6 is the invention according to claims 1, 2,
The insulating rubber sleeve in 3, 4 or 5, wherein the inner diameter of the cable insertion opening into which the insulated power cable is inserted is formed smaller than the outer diameter of the insulated power cable,
It is characterized in that contractile elasticity capable of maintaining airtightness and liquidtightness is obtained between the insulated power cable and a cable sheath.

By doing so, the airtightness between the base end and the cable sheath of the insulated power cable can be achieved without requiring the installation of a fastener at the base end of the insulating rubber sleeve on the cable insertion opening side. , Liquid tightness can be obtained and there is no need for fasteners as described above,
The structure becomes simpler and the work becomes easier.

[0020]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a terminal processing section of an insulated power cable according to the present invention. 1 to 3 show an example of an embodiment of the present invention. FIG. 1 is a partially longitudinal side view of a terminal processing section of an insulated power cable of this example, and FIG. 2 is a ground connection used in FIG. FIG. 3 is an enlarged view showing the configuration of the lead-out portion of the conductor, and FIG. 3 is an exploded explanatory view showing the configuration of the lead-out portion of the ground connection conductor shown in FIG.

In the terminal processing section of the insulated power cable of the present embodiment, the end of the insulated power cable 1 is stripped, and a metal shielding tape layer 3, an outer semiconductive layer 4, Cable insulation layer 5,
The cable conductors (not shown) are sequentially exposed, and the connection terminals 6 are connected to the exposed cable conductors by crimping or the like,
An insulating rubber sleeve 7 is air-tightly and liquid-tightly fitted over the distal end of the cable sheath 2 and the base of the connection terminal 6 so as to cover a portion therebetween. An electric field alleviating portion 8 is provided between the insulating rubber sleeve 7 and a portion straddling the metal shielding tape layer 3, the external semiconductive layer 4, and the cable insulating layer 5.

The insulating rubber sleeve 7 has an inner diameter of a cable insertion opening 10 at a base end 9 into which the insulated power cable 1 is inserted, which is smaller than an outer diameter of the insulated power cable 1. A contraction elasticity capable of maintaining an airtight and liquid-tight state between the cable 1 and the cable 1 is obtained. Closely adhered.

A grounding clamp 1 is mounted on the outer periphery of the metal shielding tape layer 3 exposed by stripping the insulated power cable 1.
The grounding clamp 11 is provided with a grounding connection conductor 13 which extends through a through hole 12 formed in the peripheral wall of the insulating rubber sleeve 8 and is led out of the insulating rubber sleeve 7. The insulating rubber sleeve 7 is fastened to the grounding connection conductor 13 between the grounding clamp 11 and the grounding connection conductor 1.
A fastening member 14 for achieving airtightness and liquid tightness at a portion where 3 passes is provided.

In the grounding clamp 11, a clamp body 15 which is fixed in close contact with the outer periphery of the metal shielding tape layer 3, and is provided integrally with the clamp body 15, and is provided on the inner surface of the insulating rubber sleeve 7. It comprises a spacer 16 that supports the periphery of the through hole 12 and is provided with the ground connection conductor 13. The clamp body 15 is mainly composed of a conductive elastic metal sleeve 17 whose inner diameter when not attached is smaller than the outer diameter of the metal shielding tape layer 3 so that it can be brought into close contact with the outer periphery of the metal shielding tape layer 3. The elastic metal sleeve 17 has a structure in which a slit 18 serving as a mounting port is provided.

Since the clamp body 15 has a structure in which the slit 18 serving as a mounting port is provided in the elastic metal sleeve 17, the mounting of the clamp body 15 on the metal shielding tape layer 3 increases the diameter of the slit 18. Then, the metal shielding tape layer 3 can be easily pushed into the elastic metal sleeve 17 by a simple operation.

The spacer 16 is made of a conductive metal similarly to the clamp body 15, and the ground connection conductor 13 is fixedly provided on the tip end surface thereof. The ground connection conductor 13 is made of a conductive bolt 19, and a spacer 16 is provided in a direction orthogonal to the clamp body 15.
Fixed electrically and mechanically to

On the outer periphery of the bolt 19 serving as the ground connection conductor 13, packings 20, 21 are provided at locations where the bolt 19 passes through the insulating rubber sleeve 7.
A fastening member 14 for fastening the insulating rubber sleeve 7 to the bolt 19 via the outer and inner packings 20 and 21 between the spacer 19 and the bolt 19. Nut 22
Is screwed. Nut 2 screwed to this bolt 19
By tightening the insulating rubber sleeve 7 via the outer and inner packings 20 and 21 in 2, the portion of the insulating rubber sleeve 7 through which the bolt 19 serving as the ground connection conductor 13 passes is hermetically and liquid-tightly sealed.

The formation of the terminal processing section of the insulated power cable configured as described above can be performed as follows.

First, the end of the insulated power cable 1 is stripped off, and the metal shielding tape layer 3, the outer semiconductive layer 4, the cable insulating layer 5, and the cable conductor (not shown) are sequentially exposed from the cable sheath 2. Let it. In such a state, the connection terminal 6 is connected to the exposed end of the cable conductor.

On the outer periphery of the exposed metal shielding tape layer 3, a clamp body 15 constituting the ground clamp 11 is provided.
Are mounted by using the slits 18 with their diameters increased to establish electrical continuity. Then, a packing 20 to be brought into contact with the inner surface of the insulating rubber sleeve 7 is fitted to a bolt 19 provided on the ground clamp 11 and serving as the ground connection conductor 13.

Next, the insulating rubber sleeve 7 is folded outward from the base end 9 side to the through hole 12, and in this state, the end of the insulated power cable 1 is inserted, and the grounding clamp 11 is mounted on the grounding clamp 11. After aligning the bolt 19 serving as the connection conductor 13 with the through hole 12 formed in the peripheral wall of the insulating rubber sleeve 7, the bent portion of the insulating rubber sleeve 7 is fixed, and the through hole 12 is positioned at the position of the bolt 19. The portion where the hole 12 is formed is expanded, and a bolt 19 is inserted into the through hole 12.
To make the base end 9 tightly adhere to the outer periphery of the cable sheath 2 in an air-tight and liquid-tight manner by its contraction elasticity.

Finally, a packing 21 for contacting the outer surface of the insulating rubber sleeve 7 is fitted to a bolt 19 projecting from the through hole 12 of the insulating rubber sleeve 7 to the outside, and a nut 22 serving as a fastening member 14 is screwed. Then, the insulating rubber sleeve 7 is tightened between the spacers 16 via the packings 20 and 21, whereby the insulating rubber sleeve 7 is
Of the bolt 19 penetrating through the airtight and liquid tight.

FIGS. 4 and 5 show other embodiments of the terminal processing section of the insulated power cable according to the present invention. In the example of the embodiment shown in FIG. 4, the bolt 19a serving as the ground connection conductor 13 is formed shorter than the bolt 19 of the example of the embodiment shown in FIG. The nut 22a is provided with a ground rod 23 which forms the ground connection conductor 13 together with the bolt 19a.

According to this configuration, since the length of the bolt 19a is short, the amount of expanding the insulating rubber sleeve 7 in order to allow the bolt 19a to pass through the through hole 12 can be reduced, and the terminal processing section of the insulated power cable can be reduced accordingly. Forming operation becomes easy. At this time, the length of the bolt 19a is shortened. However, since the grounding rod 23 provided on the nut 22a forms the grounding connection conductor 13 together with the bolt 19a, the necessary length as the grounding connection conductor 13 is secured. You.

In the embodiment shown in FIG. 5, a screw hole 24 is formed in the distal end face of the spacer 16, and a bolt 19b serving as the ground connection conductor 13 is provided with a flange 25 serving as the fastening member 14. The bolt 19b is inserted from the outside of the insulating rubber sleeve 17 into the through hole 12,
The insulating rubber sleeve 7 is screwed into the screw hole 24 of the spacer 16 on the inside, and the insulating rubber sleeve 7 is tightened by the flange 25 via the packings 20 and 21.

According to this configuration, the insulating rubber sleeve 7
The amount of expansion is small enough to clear the height of the spacer 16, and the work of forming the terminal processing portion of the insulated power cable is further facilitated.

[0037]

As described above, according to the terminal treatment section of the insulated power cable according to the present invention, the grounding clamp provided on the outer periphery of the metal shielding tape layer has the through hole formed in the peripheral wall of the insulating rubber sleeve. A ground connection conductor is provided which extends through and is led out of the insulating rubber sleeve, and the ground connection conductor is not led out between the base end portion of the insulating rubber sleeve and the cable sheath as in the related art. This eliminates the need for a skillful operation such as forming a self-sealing tape layer on the outer periphery of the cable sheath between the base end of the insulating rubber sleeve and the cable sheath in a gas-tight and liquid-tight manner.

The ground connection conductor is provided with a tightening member for tightening the insulating rubber sleeve between the ground rubber and the ground clamp.
Airtightness and liquid tightness can be reliably obtained in a portion of the insulating rubber sleeve that requires liquid tightness, through which the ground connection conductor penetrates, by a simple operation such as fastening the insulating rubber sleeve with the fastening member.

[Brief description of the drawings]

FIG. 1 is a partially longitudinal side view of an example of an embodiment of a terminal processing section of an insulated power cable according to the present invention.

FIG. 2 is an enlarged view showing a configuration of a lead-out portion of a ground connection conductor used in FIG.

FIG. 3 is an exploded explanatory view showing a configuration of a drawing portion of a ground connection conductor shown in FIG. 2;

FIG. 4 is an exploded explanatory view showing a main part of another example of the embodiment of the terminal processing unit of the insulated power cable according to the present invention.

FIG. 5 is an exploded explanatory view showing a main part of another example of the embodiment of the terminal processing unit of the insulated power cable according to the present invention.

FIG. 6 is a partially longitudinal side view showing a terminal processing unit of a conventional insulated power cable.

FIG. 7 is a partially longitudinal side view showing a terminal processing unit of another conventional insulated power cable.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulated power cable 2 Cable sheath 3 Metal shielding tape layer 4 External semiconductive layer 5 Cable insulating layer 6 Connection terminal 7 Insulating rubber sleeve 8 Electric field alleviation part 9 Base end part 10 Cable insertion opening 11 Ground clamp 12 Through hole 13 Ground connection conductor 14 Tightening member 15 Clamp body 16 Spacer 17 Elastic metal sleeve 18 Slit 19, 19a, 19b Bolt 20, 21 Packing 22, 22a Nut 23 Ground rod 24 Screw hole 25 Flange

Claims (6)

[Claims] An end of an insulated power cable is stripped to expose a metal shielding tape layer, an outer semiconductive layer, a cable insulating layer, and a cable conductor in sequence from a cable sheath, and are connected to the exposed cable conductor. A terminal is connected, an insulating rubber sleeve is fitted over the distal end of the cable sheath and the base of the connection terminal, and a ground connection conductor connected to the metal shielding tape layer is provided outside the insulating rubber sleeve. In the terminal processing portion of the insulated power cable, a grounding clamp is provided in close contact with the outer periphery of the metal shielding tape layer, and the grounding clamp passes through a through hole formed in the peripheral wall of the insulating rubber sleeve. A ground connection conductor is provided outside the insulating rubber sleeve, and the insulating rubber sleeve is fastened to the ground connection conductor between the grounding clamp and the ground connection conductor. Terminal processing unit of the insulated power cables, characterized in that the tightening member is provided attached. 2. The grounding clamp according to claim 1, wherein the grounding clamp is provided integrally with the clamp main body, which is fixed to the outer periphery of the metal shielding tape layer, and is provided integrally with the clamp main body. The terminal processing unit of an insulated power cable according to claim 1, further comprising a spacer that supports and is provided with the ground connection conductor. 3. The ground connection conductor according to claim 2, wherein the ground connection conductor comprises a conductive bolt, and the bolt is electrically and mechanically connected to the spacer in a direction orthogonal to the ground clamp. A terminal processing unit of the insulated power cable described in the above. 4. A bolt serving as the ground connection conductor is fixed to the spacer, and a packing contacts an inner surface and an outer surface of the insulating rubber sleeve at a position where the bolt penetrates the insulating rubber sleeve on an outer periphery of the bolt. And a nut serving as a tightening member for tightening the insulating rubber sleeve between the spacer and the spacer via the outer and inner packings between the spacer and the spacer. The terminal processing unit of the insulated power cable according to claim 3. 5. A bolt serving as the ground connection conductor is detachably screwed into a screw hole formed in the spacer, and a packing is provided on an outer periphery of the bolt at a location where the bolt passes through the insulating rubber sleeve. A flange which is fitted and arranged so as to be in contact with an inner surface and an outer surface of the insulating rubber sleeve, and which serves as a fastening member for fastening the insulating rubber sleeve to the bolt via the outer and inner packings between the spacer and the spacer; The terminal processing unit for an insulated power cable according to claim 3, wherein a terminal is provided. 6. The insulating rubber sleeve, wherein the inner diameter of the cable insertion opening into which the insulated power cable is inserted is formed to be smaller than the outer diameter of the insulated power cable. 6. The terminal processing unit for an insulated power cable according to claim 1, wherein a contraction elasticity capable of maintaining liquid tightness is obtained.