JP2618601B2 - Main power cable termination - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main power cable termination.

[0002]

2. Description of the Related Art Conventionally, at the end of a high-voltage main power cable that branches at predetermined locations, a stress cone is attached to the outer periphery of a cable core exposed at a predetermined length at a terminal, and a shielding treatment layer is applied to the outer periphery. It was the structure which did.

[0003]

However, such a conventional mains power cable termination requires expensive terminal processing parts such as stress cones, and has a problem that the structure becomes complicated and the cost increases. there were.

[0004] It is an object of the present invention to provide a mains power cable termination that can be easily and inexpensively formed.

[0005]

The structure of the present invention that achieves the above object will be described as follows.

In the main power cable terminal according to the present invention, a branch sleeve is incorporated in a prefabricated insulator whose outer surface is covered with an external semiconductive layer, and both ends of the prefabricated insulator are opposed to both ends of the branch sleeve. A prefabricated branch having a structure in which an insertion port is opened is used, and an end of a mains power cable is inserted and arranged in one of the insertion ports of the prefabricated insulator, and is connected to the branch sleeve in the prefabricated insulator. Is connected to a cable conductor at an end of the main power cable, an insulating plug is inserted into the other insertion port of the prefabricated insulator, and the outside of the prefabricated insulator is provided at an outward end of the insulating plug. An external semiconductive layer connected to the semiconductive layer is provided.

[0007]

In this manner, at the branch portion of the main power cable using the prefabricated branch, an insulating plug is inserted and arranged at the other insertion port of the prefabricated insulator of the prefabricated branch, and the insulating plug is disposed at the outward end of the insulating plug. By providing an external semiconductive layer connected to the external semiconductive layer of the prefabricated insulator, it is possible to perform termination processing using a branch portion of the main power cable.

The prefabricated branch has an outer semiconductive layer on the outer surface of the prefabricated insulator and an outer semiconductive layer on the outer surface at the outward end of the insulating plug. Since the connection is established, termination processing can be performed safely.

In the present invention, the outer semiconductive layer covering the outward end of the insulating plug is formed by wrapping a semiconductive tape on the outward end of the insulating plug, covering the semiconductive cap, or forming the outer semiconductive layer outside the insulating plug. It can be formed by previously providing a semiconductive layer integrally at the facing end.

In particular, if a semiconductive layer is integrally provided in advance on the outward end of the insulating plug, the number of post-processing operations can be reduced by one step, and the work efficiency of forming the cable end can be improved.

Further, when the insulating plug is provided with a step and this step comes into contact with the entrance of the insertion port of the prefabricated insulator, the positioning of the insulating plug with respect to the prefabricated insulator can be reliably performed.

[0012]

1 (A) and 1 (B) show a first embodiment of a main power cable termination section according to the present invention applied to a plug-in branch connection section of a high-voltage harness cable.

In this embodiment, a prefabricated branch 1 as shown is used. The prefabricated branch 1 is a prefabricated insulator 4 having a cylindrical shape, the outer surface of which is covered with an outer semiconductive layer 2 and the inner semiconductive layer 3 is provided in the center of the inner surface.
And a branch sleeve 5 that is incorporated in the prefabricated insulator 4 so as to be present in the inner semiconductive layer 3. The outer semiconductive layer 2 and the inner semiconductive layer 3 are formed of conductive rubber, and the prefabricated insulator 4 is formed of insulating rubber. These outer semiconductive layer 2, inner semiconductive layer 3 and prefabricated insulator 4 are formed by integral molding. Opposite ends of the prefabricated insulator 4 are opposed to both ends of the branch sleeve 5, and insertion openings 4a and 4b are respectively opened. Insertion port 4 of such prefabricated branch 1
The external shape on the sides a and 4b is formed in a tapered shape in which the outer diameter gradually decreases toward the end.

The trunk power cable 6 is stripped off at its end so that a cable shielding layer 8, a cable outer semiconductive layer 9, a cable insulating layer 10,
The cable conductors 11 are sequentially exposed. Before inserting the end of such a mains power cable 6 into the prefabricated insulator 4, an insulating spacer 13 with an internal semiconductive layer 12 is attached to the outer periphery of the cable insulating layer 10 in advance, and the cable conductor 11 is branched beforehand. The sleeve 5 is fitted and connected by crimping. The branch sleeve 5 is inserted together when the end of the main power cable 6 is inserted into the prefabricated insulator 4 from the insertion port 4a, and is positioned at the center in the inner semiconductive layer 3.

At one end of the prefabricated insulator 4, the shielding treatment layer 1 is wound by a self-fusing tape or the like over the external semiconductive layer 2 and the cable external semiconductive layer 9 of the prefabricated insulator 4.
4 is provided, and the cable shielding layer 8 and the external semiconductive layer 2 of the prefabricated insulator 4 are electrically connected to each other by winding a conductive wire 15, and further connected to the external semiconductive layer 2 of the prefabricated insulator 4. An insulating tape winding layer 16 is provided over the cable sheath 7 by winding an insulating tape such as a polyvinyl chloride tape, and a heat-shrinkable tube 17 is mounted on the outer periphery thereof.

A branch connection screw hole 18 is provided at the center of the outer circumference of the branch sleeve 5 in the longitudinal direction, and a branch connection insertion port 19 is opened corresponding to a place where the branch connection screw hole 18 is to exist. ing. This branch connection outlet 19
The branch connection guide tubular portion 20 is provided on the prefabricated insulator 4 integrally with the prefabricated insulator 4.
The branch connection guide cylindrical portion 20 is formed in a tapered shape whose outer diameter gradually increases from the distal end to the proximal end. On the outer periphery of the base portion of such a branch connection guide tubular portion 20, a branch connection body mounting seat portion 21 is formed by an external semiconductive layer 2.
Is provided. The thread portion 22a of the tulip-shaped female connector 22 for branch connection is screwed and connected to the branch connection screw hole 18 of the branch sleeve 5. On the outer periphery of the female connector 22 for branch connection, a metal tubular body 23 having an open distal end and an inner flange 23a at the base end locked to the female connector 22 for branch connection is mounted. The female connector 22 for branch connection to which the metal cylindrical body 23 is mounted as described above is accommodated in the branch connection guide cylindrical portion 20. The tip of the metal cylinder 23 projects beyond the tip of the female connector 22 for branch connection, and the arc-extinguishing cylinder 24 is attached to the tip of the metal cylinder 23.

The branch cable 25 to be connected to the female connector 22 for branch connection is stripped off at its end so that a cable shielding layer 27, a cable external semiconductive layer 28, a cable insulating layer 29, Cable conductor 3
0 are sequentially exposed. Such a branch cable 25
An L-shaped prefabricated branch connector 31 is attached to the end of the connector.

The prefabricated branch connection connector 31 has an L-shaped tubular shape, and its outer surface is covered with an outer semiconductive layer 32, and an inner semiconductive layer 33 is provided in the center of the inner surface of the corner portion. And a crimp terminal 35 and a male connector 36 for branch connection incorporated in the prefabricated insulator 34. Outer semiconductive layer 32
The internal semiconductive layer 33 is formed of conductive rubber, and the prefabricated insulator 34 is formed of insulating rubber. The outer semiconductive layer 32, inner semiconductive layer 33, and prefabricated insulator 34 are formed by integral molding. The outer circumference at the base end side of the prefabricated insulator 34 is tapered. Screw hole 35a on the base end side of crimp terminal 35 in inner semiconductive layer 33
A screw portion 36a at the base end of the male connector 36 for branch connection is screwed to the crimp terminal 35 and the male connector 36 for branch connection is connected at a right angle. The crimp terminal 35 is the inner semiconductive layer 3
3, and the male connector 36 for branch connection is formed with a length protruding from the other end of the internal semiconductive layer 33. In the prefabricated insulator 34, insertion ports 34a and 34b are respectively opened on the side facing the crimp terminal 35 and the side facing the male connector 36 for branch connection. In this case, the insertion port 34a is formed as a straight hole,
The insertion port 34b has a tapered branch connection guide cylindrical portion 2.
It is formed as a tapered hole so that it can be fitted to the outer circumference of 0. The male connector 36 for branch connection protrudes from the center of the tapered insertion port 34b. An arc extinguisher 37 is attached to the tip of the male connector 36 for branch connection.

The cable conductor 3 at the end of the branch cable 25
0, an insulating spacer 39 with an internal semiconductive layer 38 is mounted on the outer periphery of the cable insulating layer 29 before being inserted into the prefabricated insulator 34, and a crimp terminal 35 is previously crimp-connected to the cable conductor 30. It is supposed to be. In this case, the internal semiconductive layer 38 is provided continuously to the end of the insulating spacer 39. The crimp terminal 35 is inserted together when the end of the branch cable 25 is inserted into the prefabricated insulator 34 from the insertion port 34a, and is positioned in the inner semiconductive layer 34. With the crimp terminal 35 positioned, the screw portion 3 of the male connector 36 for branch connection described above is used.
6 a is screwed into the screw hole 35 a of the crimp terminal 35. With the crimp terminal 35 positioned,
Inner semiconductive layer 38 is adapted to contact cable outer semiconductive layer 28.

At the base end of the prefabricated insulator 34, the outer semiconductive layer 32 of the prefabricated insulator 34 and the cable sheath 26
A heat-shrinkable tube 40 is attached to the end.

In the prefabricated branch connector 31 connected to the branch cable 25, the male connector 36 for branch connection is fitted into the female connector 22 for branch connection, and the tapered insertion port 34b of the prefabricated insulator 34 is formed. Is connected to the prefabricated branch body 1 by fitting it into the branch connection guide cylinder 20. In this state, the prefabricated insulator 34 is fastened to a nut (not shown) embedded and supported in the branch connector mounting seat 21 by a bolt 42 with a flange 41 locked on the outer periphery of the leading end of the prefabricated insulator 34. It is configured to be fixed to the branch body 1. The flange 41 is locked to the prefabricated insulator 34 by fitting the locking projection 41 a into a locking recess 32 a on the outer periphery of the distal end of the external semiconductive layer 32.

The other plug 4b of the prefabricated insulator 4 in the prefabricated branch 1 is provided with an insulating plug 43 made of insulating rubber.
Is inserted and arranged. The insulating plug 43 has a columnar plug portion 4.
3a and a head 43b integrally formed at the outward end with an outer diameter larger than the plug 43a.
For this reason, the step 4 is provided on the head 43b adjacent to the plug 43a.
3c is present. The position of the insulating plug 43 is determined by contacting the stepped portion 43c with the end of the other insertion port 4b of the prefabricated insulator 4.

In a state where the insulating plug 43 is attached to the prefabricated insulator 4, the insulating plug 43 straddles the head 43 b at the outward end of the insulating plug 43 and the external semiconductive layer 2 of the prefabricated insulator 4. An outer semiconductive layer 44 is provided by winding a semiconductive tape, and the outer periphery of the outer semiconductive layer 44 and the prefabricated insulator 4 are formed.
A waterproof / electric insulating layer 45 is provided by winding a self-fusing tape over the outer semiconductive layer 2 of FIG. A cap fixing layer 47 such as a polyvinyl chloride tape is provided over the cap 46 and the outer semiconductive layer 2 of the prefabricated insulator 4.

As described above, at the branch of the main power cable 6 using the prefabricated branch 1, the insulating plug 43 is inserted and arranged in the other insertion port 4b of the prefabricated insulator 4 of the prefabricated branch 1. When an external semiconductive layer 44 connected to the external semiconductive layer 2 of the prefabricated insulator 4 is provided at the outward end of the prefabricated insulator 4, termination processing can be performed using the branch portion of the main power cable 6.

The prefabricated branch 1 has an external semiconductive layer 2 on the outer surface of the prefabricated insulator 4 and an external semiconductive layer 2 on the surface of the head 43b which is the outward end of the insulating plug 43. Since the external semiconductive layers 2 and 44 are electrically connected to each other, termination processing can be performed safely.

In particular, the prefabricated branch 1 has an inner semiconductive layer 3
And a prefabricated insulator 4 and an external semiconductive layer 2, and if the external shape of the insertion ports 4a, 4b is tapered so that the outer diameter gradually decreases toward the end, these structural parts become Since the same operation as the stress cone is performed, the terminal portion can be formed on the insertion port 4b side without providing a special stress cone for the terminal.

FIGS. 2A and 2B show a second embodiment of a main power cable termination section according to the present invention applied to a plug-in branch connection section of a high voltage harness cable. The parts corresponding to those in the first embodiment are denoted by the same reference numerals.

In this embodiment, an external semiconductive layer 44 is previously formed integrally on the surface of the head 43b, which is the outward end of the insulating plug 43, and on a part of the outer periphery of the plug 43a adjacent to the head 43b. It differs from the first embodiment in that it is provided.

Accordingly, in this embodiment, with the insulating plug 43 attached to the prefabricated insulator 4, the insulating plug 43
The waterproof / electrical insulating layer 45 is formed by wrapping a self-sealing tape over the external semiconductive layer 44 covering the surface of the head 43b at the outward end and the external semiconductive layer 2 of the prefabricated insulator 4. An insulating cap 46 is put on the outer surface of the waterproof / electrical insulating layer 45, and extends over the insulating cap 46 and the outer semiconductive layer 2 of the prefabricated insulator 4 such as a polyvinyl chloride tape. A cap fixing layer 47 is provided.

Also in this embodiment, at the branch portion of the main power cable 6 using the prefabricated branch 1, the prefabricated branch 1
An insulating plug 43 is inserted into the other insertion port 4b of the prefabricated insulator 4 of FIG.
The outer semi-conductive layer 44 connected to the outer semi-conductive layer 2 of the prefabricated insulator 4 is provided at the outward end of the insulating plug 43.
Is provided, the termination process can be performed using the branch portion of the main power cable 6.

The prefabricated branch 1 also has the external semiconductive layer 2 on the outer surface of the prefabricated insulator 4 and the external semiconductive layer 2 on the surface of the head 43 b which is the outward end of the insulating plug 43. Since the external semiconductive layers 2 and 44 are electrically connected to each other, termination processing can be performed safely.

In particular, the prefabricated branch 1 is composed of the inner semiconductive layer 3
And a prefabricated insulator 4 and an external semiconductive layer 2, and if the external shape of the insertion ports 4a, 4b is tapered so that the outer diameter gradually decreases toward the end, these structural parts become Since the same operation as the stress cone is performed, the terminal portion can be formed on the insertion port 4b side without providing a special stress cone for the terminal.

In the second embodiment, since the external semiconductive layer 44 is provided in the insulating plug 43 in advance by integral molding, the step of providing the external semiconductive layer 44 on the insulating plug 43 later becomes unnecessary. The number of processing operations is reduced by one step, and the working efficiency of forming the cable end portion can be improved.

In the first and second embodiments, the external semiconductive layer 44 may be formed in a cap shape in advance and fitted to the head 43b of the insulating plug 43.

The preferred embodiments of the present invention disclosed herein are summarized as follows.

(1) A branch sleeve is incorporated in a prefabricated insulator whose outer surface is covered with an external semiconductive layer, and insertion holes are respectively opened at both ends of the prefabricated insulator facing both ends of the branch sleeve. A prefabricated branch having a structure is used, and an end of a mains power cable is inserted and arranged at one of the insertion ports of the prefabricated insulator,
A cable conductor at an end of the main power cable is connected to the branch sleeve in the prefabricated insulator, and an insulating plug is inserted and arranged in the other insertion port of the prefabricated insulator, and an outward end of the insulating plug is provided. A mains power cable termination, wherein an external semi-conductive layer is provided to connect to the external semi-conductive layer of the prefabricated insulator.

(2) A branch sleeve is incorporated in a prefabricated insulator in which the outer surface is covered with an outer semiconductive layer and the inner surface is provided with an inner semiconductive layer. Insert holes are respectively opened at both ends of the body, and a prefabricated branch body having a structure in which the outer shape of the insert side is formed in a tapered shape that gradually reduces the outer diameter toward the end is used, An end of a mains power cable is inserted and arranged in one of the insertion ports of the body, a cable conductor at an end of the mains power cable is connected to the branch sleeve in the prefabricated insulator, and the other end of the prefabricated insulator is connected to the branch sleeve. An insulating plug is inserted into the insertion port, and an outer semiconductive layer connected to the outer semiconductive layer of the prefabricated insulator is provided at an outward end of the insulating plug. A mains power cable termination section characterized by the following.

As described above, the prefabricated branch has the inner semiconductive layer, the prefabricated insulator, and the outer semiconductive layer, and the outer shape of each insertion port side is tapered so that the outer diameter gradually decreases toward the end. In such a case, these structural parts function in the same manner as the stress cone, so that the terminal portion can be formed on the insertion port side without providing a special stress cone for the terminal.

(3) A branch sleeve is incorporated in a prefabricated insulator whose outer surface is covered with an external semiconductive layer, and insertion holes are respectively opened at both ends of the prefabricated insulator facing both ends of the branch sleeve. A prefabricated branch having a structure is used, and an end of a mains power cable is inserted and arranged at one of the insertion ports of the prefabricated insulator,
A cable conductor at an end of the main power cable is connected to the branch sleeve in the prefabricated insulator, and an insulating plug is inserted and arranged in the other insertion port of the prefabricated insulator, and an outward end of the insulating plug is provided. An end of a mains power cable, wherein an outer semiconductive layer connected to the outer semiconductive layer of the prefabricated insulator is integrally provided on a surface.

As described above, if the semiconductive layer is integrally provided in advance on the outward end of the insulating plug, the number of post-processing operations is reduced by one step, and the work efficiency of forming the cable end portion can be improved.

(4) A branch sleeve is incorporated in a prefabricated insulator in which the outer surface is covered with an outer semiconductive layer and the inner surface is provided with an inner semiconductive layer. Insert holes are respectively opened at both ends of the body, and a prefabricated branch body having a structure in which the outer shape of the insert side is formed in a tapered shape that gradually reduces the outer diameter toward the end is used, An end of a mains power cable is inserted and arranged in one of the insertion ports of the body, a cable conductor at an end of the mains power cable is connected to the branch sleeve in the prefabricated insulator, and the other end of the prefabricated insulator is connected to the branch sleeve. An insulating plug is inserted into the insertion port, and an outer semiconductive layer connected to the outer semiconductive layer of the prefabricated insulator is provided on an outer end surface of the insulating plug. A main power cable termination section, which is provided integrally.

As described above, the prefabricated branch body has the inner semiconductive layer, the prefabricated insulator, and the outer semiconductive layer, and the outer shape of each insertion port side gradually decreases in outer diameter toward the end. In this case, these structural portions function in the same manner as the stress cone, so that the terminal portion can be formed on the insertion port side without providing a special stress cone for the terminal.

Further, if a semiconductive layer is provided integrally on the outward end of the insulating plug in advance, the number of post-processing operations is reduced by one step, and the working efficiency of forming the cable end portion can be improved.

[0044]

As described above, according to the main power cable termination section according to the present invention, the following excellent effects can be obtained.

According to the present invention, at the branch of the main power cable using the prefabricated branch, an insulating plug is inserted and arranged at the other insertion port of the prefabricated insulator of the prefabricated branch, and the outward end of the insulating plug is disposed. Has an external semiconductive layer connected to the external semiconductive layer of the prefabricated insulator, so that termination processing can be performed using the branch portion of the main power cable.

In this prefabricated branch, an outer semiconductive layer is provided on the outer surface of the prefabricated insulator, and an outer semiconductive layer is provided on the outer surface of the outward end of the insulating plug. Since they are connected, termination processing can be performed safely without using a stress cone.

[Brief description of the drawings]

FIG. 1A is a longitudinal sectional view of a first embodiment of a main power cable termination section according to the present invention, and FIG. 1B is a right side view of FIG.

FIG. 2A is a longitudinal sectional view of a second embodiment of a trunk power cable termination according to the present invention, and FIG. 2B is a right side view of FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 prefabricated branch 2 outer semiconductive layer 3 inner semiconductive layer 4 prefabricated insulator 4 a, 4 b insertion port 5 branch sleeve 6 trunk power cable 7 cable sheath 8 cable shielding layer 9 cable outer semiconductive layer 10 cable insulating layer 11 cable conductor REFERENCE SIGNS LIST 12 Internal semiconductive layer 13 Insulating spacer 14 Shielding treatment layer 15 Conducting wire 16 Insulating tape winding layer 17 Heat shrink tube 18 Screw hole for branch connection 19 Branch connection insertion port 20 Branch connection guide cylinder 21 Branch connection body mounting seat 22 Branch Female connector for connection 22a Screw part 23 Metal cylinder 23a Inner flange part 24 Arc extinguishing cylinder 25 Branch cable 26 Cable sheath 27 Cable shielding layer 28 Cable external semiconductive layer 29 Cable insulation layer 30 Cable conductor 31 Prefab branch connection connector 32 Outer semiconductive layer 33 Inner semiconductive layer 3 Prefabricated insulators 34a, 34b Insert port 35 Crimp terminal 35a Screw hole 36 Male connector for branch connection 36a Screw part 37 Arc extinguisher 38 Inner semiconductive layer 39 Insulation spacer 40 Heat shrink tube 41 Flange 42 Bolt 43 Insulation plug 43a Plug 43b Head 43c Step 44 External semiconductive layer 45 Waterproof / electrical insulating layer 46 Insulating cap 47 Cap fixing layer

Claims (1)

(57) [Claims] 1. A branch sleeve is incorporated in a prefabricated insulator whose outer surface is covered with an external semiconductive layer, and insertion ports are respectively opened at both ends of the prefabricated insulator opposite both ends of the branch sleeve. A prefabricated branch having a structure is used, and an end of a mains power cable is inserted and arranged at one of the insertion ports of the prefabricated insulator, and a branch sleeve in the prefabricated insulator is provided at an end of the mains power cable. A cable conductor is connected, an insulating plug is inserted and arranged in the other insertion port of the prefabricated insulator, and an external semiconductive layer connected to the external semiconductive layer of the prefabricated insulator is provided at an outward end of the insulating plug. A mains power cable termination, characterized in that a layer is provided.