JPH10285777A - Joining part of cv cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jointing part of a CV cable (cross-linked polyethylene insulated power cable) which is made to be compact by reducing a working length and can be made by a simplified working procedure. SOLUTION: Conductors 2a and 2a' of 1st and 2nd CV cables 2 and 2' and a high-voltage shielding electrode 111 are connected with a conductor connection part 12. Metallic shields 2d and 2d' of the 1st and the 2nd CV cables 2 and 2' are connected by insulated connection through an edge cut part 110b, integrally formed with an epoxy insulator 110. Since the edge cut part 110b is integrally formed with the epoxy insulator 110, and moreover, the transfer of an epoxy unit 11 is not necessary, the size of the joint part on a longitudinal direction can be reduced and a working procedure can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection portion of a CV cable (crosslinked polyerylene insulated power cable).
In particular, it relates to a connection portion of a CV cable connected by a prefabricated system.

[0002]

2. Description of the Related Art A CV connected by a conventional prefabricated system
As a connection portion of the cable, for example, there is one shown in FIG. The connecting portion 1 is a conductor connecting pipe 3 for connecting the conductors 2a, 2a 'of the first and second CV cables 2, 2'.
And an epoxy unit 4 in which a shield electrode 4B connected to the conductor connection tube 3 is embedded in an epoxy insulator 4A, a pre-molded insulator 5, 5 'is provided in a tapered portion 4a of the epoxy insulator 4A by a stopper 6, and a pressing member 7A. , Epoch tube 7B
The spring units 8 and 8 'pressed by springs 8A, 8B, 8A' and 8B 'through the opening unit, the edge cutout 9 provided independently of the epoxy unit 4, and the connection unit 1
A protective tube 1A for protecting the whole is provided, and the metal shields 2d and 2d 'of the first and second CV cables 2 and 2' are insulated and connected via a rim portion 9. In addition,
In the figure, 9A and 9B are ground terminals.

When the connecting portion 1 is applied to an actual line, as shown in FIG. 4, the terminals of the CV cables 2 and 2 'are stripped off, and the conductors 2a and 2a' and insulators 2b made of cross-linked polyethylene are used. 2b ', the outer semiconductive layers 2c and 2c' and the metal shields 2d and 2d 'are exposed from the anticorrosion layers 2e and 2e'.
A finishing process is performed on the insulators 2b and 2b '. Next, FIG.
As shown in (a), the epoxy unit 4 and the pre-mold insulator 5 are inserted into the first CV cable 2, and the pre-mold insulator 5 'is inserted into the second CV cable 2'.
The epoxy unit 4 is left to the left so that conductor connection can be performed, and the conductor connection tube 3 is compressed by a compressor to perform conductor connection. Thereafter, as shown in FIG. 5 (b), the epoxy unit 4 and the pre-molded insulator 5 are moved to the center, and a predetermined pressure is applied to the pre-molded insulators 5, 5 'by the spring units 8, 8'. Is completed. The connecting portion 1 is advantageous in quality control because components important for securing predetermined electrical performance among constituent components can be applied to the site after checking the performance in a factory in advance. In FIG. 5, the configuration of the stepped-off portion having the insulators 2b and 2b ', the external semiconductive layers 2c and 2c', and the like is not shown.

[0004]

However, according to the connection portion 1 of the conventional CV cable, the edge cut portion 9 is separated from the epoxy unit 4, and after the conductor connection is made, the epoxy unit 4 and the Since the mold insulator 5 is moved to the center and the epoxy unit 4 and the pre-mold insulators 5, 5 'are fixed, FIG.
Has a drawback that the dimension L in the longitudinal direction shown in FIG.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a connection portion of a CV cable in which the working length is shortened, the working size is reduced, and the working procedure is simplified.

[0006]

According to the present invention, in order to achieve the above object, the conductors of the first and second CV cables, which are exposed by stripping the ends, are connected by a conductor connecting portion. First and second insulation reinforcements are arranged on the exposed outer shield layer and the outer peripheral surface of the insulator, and electrically connected to the conductor connection outside the conductor connection portion and the first and second insulation reinforcements. An epoxy unit embedded with a high-voltage shield electrode connected to the epoxy unit is disposed, and the first and second insulation reinforcing members are connected to the first and second CVs by elastic compression mechanisms provided on both sides of the epoxy unit. At a connection portion of the CV cable which is pressed against an interface between the outer shield layer, the insulator and the epoxy unit of the cable, the outer shield layer of the first and second CV cables is provided. The shield layer is drawn out to the outer peripheral surface of the epoxy unit, and constitutes an insulated connection by terminating at both ends of the rim formed in the epoxy unit. The rim of the epoxy unit has an outer periphery. The present invention provides a connection portion for a CV cable, which has a water-resistant structure between the CV cable and the anticorrosion layer. According to the above configuration, the edge cut portion is integrated with the epoxy unit and the movement of the epoxy unit is not required, so that the longitudinal direction is compact and the operation procedure is simplified.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a connection portion of a CV cable according to an embodiment of the present invention. The connecting portion 10 of the CV cable is made of an epoxy insulator 11 having a substantially cylindrical shape.
Epoxy unit 11 in which a high-voltage shield electrode 111 is embedded in the center of
And conductors 2a, 2a 'of the second CV cables 2, 2'
Connecting part 12 for electrically connecting the shield electrode 111 for high voltage with the tapered part 110 of the epoxy insulator 110
a shows a pre-molded insulator 13, 1 as an insulation reinforcing body.
A spring unit 15, 15 ′ as an elastic compression mechanism for pressing the 3 ′ via the stoppers 14, 14 ′, an inner protection bracket 16 and an outer protection tube 17 (corrosion-proof layer) for protecting the entire connection portion 10, In this structure, the metal shields 2d and 2d 'of the first and second CV cables 2 and 2' (the drawing-out structure to the outside is not shown) are insulated and connected via the edge 110b. In FIG. 1, 18
A, 18B, 18C and 18C 'are waterproof tapes.

[0008] The conductor connection portion 12 is connected to the first CV cable 2.
The concave sleeve 120 is compression-connected to the conductor 2a of the second CV cable, the convex sleeve 121 is compression-connected to the conductor 2a 'of the second CV cable 2', and the concave sleeve 120 and the convex sleeve 121 are electrically connected. Contact 122 such as a multi-contact or tulip contact, and a spring 12
3, provided on the convex sleeve 121 so as to be able to appear and disappear,
The high-voltage shield electrode 111 and the convex sleeve 1 are engaged with the engagement holes 111a provided in the high-voltage shield electrode 111.
And a lock pin 123 serving as an elastic fitting body for electrically connecting the power supply 21. The concave sleeve 120 has an insertion port 120a into which the conductor 2a of the first CV cable 2 is inserted.
And a concave receiving port 120 for receiving the contact 122.
b is formed. The convex sleeve 121 has the second C
Insertion opening 121 into which conductor 2a 'of V cable 2' is inserted
a and a protrusion (not shown) to which the contact 122 is attached
Are formed. The connection between the sleeves 120 and 121 and the conductors 2a and 2a 'may be performed by compression using a normal compressor or by indent compression for driving a pin.

The pre-mold insulators 13, 13 'are formed by molding an insulating rubber 130 and a semiconductive rubber 131 into a stress cone shape.

FIG. 2A is a detailed view of a portion A in FIG. 1, and FIG. 2B is a detailed view of a portion B in FIG.

Nut fittings 112 and 113 for mounting a seat plate 151 and a mounting ring 164 are embedded in one end surface (left side) of the epoxy insulator 110, and a seat plate 157 is mounted in the other end surface (right side). A nut fitting 112 for mounting the same is embedded.

One (left) spring unit 15
Are a seat plate 151 attached to the epoxy unit 11 by bolts 150, and a shaft 1 protruding from the seat plate 151.
52, a pressing member 153 movably supported along the shaft 152, a compression coil spring 154 for urging the pressing member 153 toward the epoxy unit 11, and a compression coil spring 154 that is loosely fitted to the shaft 152 and receives the compression coil spring 154. A spring receiver 155,
An adjusting nut 156 that is screw-engaged with a female screw 152 a formed at the end of the shaft 152 and that adjusts the pressing force of the compression coil spring 154. The other (right) spring unit 15 ′ is configured similarly to the one spring unit 15, but differs only in the seat plate 157. The seat plate 157 is made of brass and has a rubber packing 158 on the mounting surface on the epoxy insulator 110 side.

The inner protective member 16 shown in FIG. 1 has a central inner protective member 16A and end inner protective members 16B and 16B 'arranged on both sides of the central inner protective member 16A. The center inner protective metal fitting 16A includes a straight cylindrical copper tube 160, a metal fitting 161 made of brass for holding one end of the copper pipe 160, and a rubber packing 162 provided inside the metal fitting 161. The other end of the copper tube 160 is held by a seat plate 157 of the spring unit 15 '. One end inner protective metal fitting 16B includes a cylindrical copper tube 163 that changes from a small-diameter portion to a large-diameter portion;
3 and a mounting ring 164 attached to the nut fitting 113 of the epoxy insulator 110 by a bolt 164A, and a ground terminal 16 provided on the copper tube 163.
And 5. The other end inner protective metal fitting 16
B 'has the same configuration as the one end inner protective metal fitting 16B, but differs only in the mounting ring 166. The mounting ring 166 has a rubber packing 167 on the mounting surface on the side of the epoxy insulator 110, and is mounted on the seat plate 157 of the spring unit 15 '.

The outer protective tube 17 comprises a central outer protective tube 170 made of PVC, and end outer protective tubes 171 and 171 'made of PVC arranged on both sides of the central outer protective tube 170.
It is composed of End outer protective tubes 171, 17
1 'has an insertion port 171a through which the ground terminal 165 is inserted.

Next, a method of connecting the connecting portion 10 of the CV cable will be described with reference to FIG. FIG. 3 is a schematic diagram for explaining a connection method of the CV cable by the connection unit 10, and FIG.
(a) is a diagram showing a connection preparation state of the first CV cable 2;
FIG. 2B is a diagram showing a connection state of the first and second CV cables 2, 2 '. As shown in FIGS. 1 and 2, the first and second CV cables 2, 2 'to be connected are provided.
Are stripped off, the conductors 2a, 2a ', the insulators 2b, 2b' made of cross-linked polyethylene, the outer semiconductive layer 2c,
2c ', a metal shield (external shield layer) 2d connected to the end protection bracket 16B, a metal shield (external shield layer) 2d' connected to the center protection bracket 16A and the end protection bracket 16B ', Exposed from 2e ',
A finish treatment of the insulator 2b is performed. Next, as shown in FIG. 3 (a), the pre-molded insulator 13 is attached to the end of the first CV cable 2, and the concave sleeve 120 is compression-connected to the conductor 2a, so that the second CV cable 2 ' , A convex sleeve 121 is compression-connected to the conductor 2a ', and a contact 122 is attached to the convex sleeve 121.

Further, the first CV cable 2 is connected to the stopper 1
4 and inserted into the epoxy unit 11 at a fixed position. Subsequently, as shown in FIG. 3B, the second CV cable 2 'is inserted into the fixed position epoxy unit 11 via the stopper 14'. When the second CV cable 2 ′ is inserted, the concave sleeve 120 and the convex sleeve 121 are electrically connected by the contact 122, and the lock pin 1
23 engages with the engaging hole 111a of the high-voltage shield electrode 111, and the high-voltage shield electrode 111 and the conductors 2, 2 '.
Are electrically connected. After that, spring unit 1
5 by the compression coil spring 154
3, 13 'are tapered portions 110a of epoxy insulator 110.
, And the entire connecting portion 10 is protected by the inner protective fitting 16 and the outer protective tube 17, and the waterproof tapes 18A, 18B, 18C, and 18C 'are wound around necessary portions. In addition,
When adjusting the pressing force of the compression coil spring 154, the end protection tubes 171 and 171 'are turned up and the adjustment nut 15 is adjusted.
Turn 6 to do. After the adjustment, the end protection tubes 171, 17
1 'is returned to the original state, and the waterproof tapes 18A and 18B are wound around the boundary between the central protective tube 170 and the end protective tubes 171 and 171'.

According to the connection portion 10 of the CV cable described above, the epoxy unit 11 has a structure in which the edge cut portion 110b is integrated with the epoxy insulator 110 and does not need to be moved. It becomes shorter by the moving distance, the size L in the longitudinal direction shown in FIG. 1 can be made compact, and the working procedure can be simplified. In addition, since it has a water-resistant structure in which rubber packings 158, 162, and 167 are provided outside the epoxy unit 11, it is excellent in waterproofness and can be made compact in the radial direction. Also, the conductor connection is performed by the epoxy unit 11
Insert CV cables 2 and 2 'from both sides of
It becomes possible to assemble the epoxy unit 11 in a fixed position, workability is remarkably improved, and the construction time can be shortened. Accordingly, construction can be performed even in a narrow manhole or the like due to the above compactness and improvement in workability.

[0018]

As described above, according to the present invention, the edge cut portion is integrated with the epoxy unit, and the movement of the epoxy unit is unnecessary, so that the longitudinal direction can be made compact. The work procedure can be simplified. Therefore, construction is possible even in a narrow manhole or the like.

[Brief description of the drawings]

FIG. 1 is a sectional view of a connecting portion of a CV cable according to the present invention.

FIGS. 2A and 2B are partial cross-sectional views of a connection portion of the CV cable according to the present invention, wherein FIG. 2A is a detailed view of a portion A of FIG. 1 and FIG.

FIGS. 3A and 3B are schematic diagrams for explaining a connection method using a connection portion of the CV cable according to the present invention. FIG. 3A is a diagram showing a connection preparation state of a first CV cable, and FIG. Is the first
Showing the connection state of the second and second CV cables

FIG. 4 is a sectional view of a connection portion of a conventional CV cable.

5A and 5B are schematic diagrams for explaining a conventional connection method using a connection portion of a CV cable, wherein FIG. 5A is a diagram illustrating conductor connection, and FIG. 5B is a diagram illustrating movement of an epoxy unit.

[Explanation of symbols]

 2, 2 'CV cable 2a, 2a' Conductor 2b, 2b 'Insulator 2c, 2c' Outer semiconductive layer 2d, 2d 'Metal shield 2e, 2e' Anticorrosion layer 10 CV cable connection 11 Epoxy unit 12 Conductor connection 13, 13 'Pre-mold insulator 14, 14' Stopper 15, 15 'Spring unit 16 Inner protection bracket 16A Central protection bracket 16B, 16B' End protection bracket 17 Outer protection tube 18A, 18B, 18C, 18C 'Waterproof tape 110 Epoxy insulator 110a Tapered portion 110b Edge cut 111 High voltage shield electrode 111a Engagement hole 112, 113 Nut fitting 120 Concave sleeve 120a Insertion port 120b Receiving port 121 Convex sleeve 121a Insertion port 122 Contact 123 Spring 124 Lock pin 130 Insulation rubber 1 31 semiconductive rubber 151,157 seat plate 152 shaft 152a female screw 153 pressing member 154 compression coil spring 155 spring receiver 156 adjustment nut 158,162,167 rubber packing 160,163 copper tube 161 holding fitting 164 mounting ring 164A bolt 165 ground terminal 166 Mounting ring 170 Central protective tube 171, 171 ′ End protective tube 171 a Insertion port

Continued on the front page (72) Inventor Shiro Tanno 5-1-1 Hidakacho, Hitachi City, Ibaraki Prefecture Power Systems Research Laboratory, Hitachi Cable, Ltd. (72) Inventor Keiichi Ouchi 5-1-1 Hidakacho, Hitachi City, Ibaraki Prefecture No. 1 Inside Hitachi Power Systems Co., Ltd. (72) Inventor Masayuki Yamaguchi 5-1-1 Hidakacho, Hitachi City, Ibaraki Prefecture Inside Hitachi Power Systems Co., Ltd. (72) Inventor Naohisa Numata Hitachi City, Ibaraki Prefecture 5-1-1, Hidaka-cho, Hitachi Cable Co., Ltd. Hidaka Factory (72) Inventor Masatoshi Sakamaki 5-1-1, Hidaka-cho, Hitachi City, Ibaraki Prefecture Hitachi Cable, Ltd. Hidaka Factory (72) Inventor Sumio Koibuchi 5-1-1, Hidaka-cho, Hitachi City, Ibaraki Prefecture Hitachi Cable Co., Ltd.

Claims (2)

[Claims] A conductor of a first and a second CV cable exposed by step peeling of an end is connected by a conductor connecting portion, and first and second outer circumferential layers of an outer shield layer and an insulator exposed by the step peel are connected to the first and second CV cables. An epoxy unit in which a second insulation reinforcing member is disposed, and a high-voltage shield electrode electrically connected to the conductor connection portion is embedded outside the conductor connection portion and the first and second insulation reinforcement members. The first and second insulation reinforcing members are disposed by an elastic compression mechanism provided on both sides of the epoxy unit, and the first and second insulation reinforcing members are connected to the outer shield layer, the insulator and the epoxy unit of the first and second CV cables. The outer shield layer of the first and second CV cables is drawn out to the outer peripheral surface of the epoxy unit. And an insulating connection portion is formed by terminating at both ends of the edge portion formed in the epoxy unit. The edge portion of the epoxy unit has a water resistance between the edge portion and an anticorrosion layer provided on the outer periphery thereof. A connection portion for a CV cable, having a structure. 2. The epoxy unit is fixed at one end thereof to the conductor connecting portion to which the conductor of the first CV cable is connected in advance, and the second CV cable is connected to the epoxy unit of the epoxy unit. 2. The CV according to claim 1, wherein the conductor of the second CV cable is fitted to the conductor connection portion or the high-voltage shield by an elastic fitting such as a lock pin by being inserted from the other end. Cable connection.