JP2011083144A - Terminating connector for power cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminating connector for power cable that prevents a cable sheath from being displaced from a connector body. <P>SOLUTION: A strip-shaped part 7a machined into a strip is provided at a part of a connector body 2 of a terminating connector 1 for power cable to be mounted on a power cable terminal 3. The strip-shaped part 7a is brought into contact on a cable sheath 3e of a power cable so as to fix the cable sheath 3e by frictional force by winding a press-winding tape 5 around the outer periphery together with the cable sheath 3. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a power cable termination connection, and more particularly to a power cable termination connection with enhanced fixing strength of a power cable sheath.

  FIG. 4 shows an example of a salt-resistant terminal connection part for power cables in accordance with the standard of JCAA C 3101-1995 of the Japan Electric Power Cable Connection Technology Association. The power cable terminal connection portion 1 according to the illustrated example is one in which the power cable terminal portion 3 is inserted into the connection portion main body 2 and compressed or pressure-bonded (for example, see Non-Patent Document 1).

  As shown in FIG. 4, the connecting portion main body 2 is composed of four components, ie, a compression terminal 2 a, a soot tube 2 b, an insulating compound 2 c, and a stress cone 7. The power cable terminal portion 3 is sequentially stripped so that the cable sheath 3e is peeled off to expose the conductor 3a, the insulator 3b, the external semiconductive layer 3c, and the copper tape 3d. A ground wire 4 is soldered to the copper tape 3d. The press-wrapping tape 5 is wound around the outer periphery of the cable sheath 3e from the stress cone tip 7c on the outer semiconductive layer 3c side and the copper tape 3d side so as to extend over the outer periphery of the cable sheath 3e. Deviation is prevented. A bracket 6 for fixing to a support (not shown) is attached to the outer periphery of the connection portion main body 2.

  Conventionally, various proposals have been made for techniques for preventing the displacement of the cable sheath of the cable. As an example of the technique, for example, there is a structure in which a cable sheath slip prevention member is attached to a cable terminal connection part (see, for example, Patent Document 1).

  In the conventional cable sheath slip prevention structure described in Patent Document 1, a pressure winding tape is wound from the end of a stress cone (end rubber bush) of the connection portion main body to the cable sheath (cable anticorrosive layer). . A wire rod such as a steel wire is spirally wound around the outer periphery of the cable sheath in order to prevent displacement of the cable sheath due to contraction of the sheath end in the longitudinal direction of the cable. One end of the wire rod is hooked on a bracket (cable clamp) mounted on the outer periphery of the connection portion main body 2.

6600V cross-linked polyethylene insulated power cable for salt damage resistant end connection standard, JCAA C 3101-1995

JP-A-10-94132

  However, the conventional cable terminal connection described in Non-Patent Document 1 restrains the cable sheath at the tip of the stress cone by the tightening force wound around the tape. However, the wound tape is subject to change over time. The force that restrains the cable sheath may be reduced due to deterioration or temperature change. In addition, the cable sheath may contract due to the presence of residual stress generated during manufacturing. As a result, the connecting portion main body and the cable sheath cannot be held at the positions set at the time of construction, and the cable sheath is likely to be displaced from the press-wrapping tape.

  On the other hand, the conventional cable terminal connection portion described in Patent Document 1 is connected by the tightening force of a single wire in addition to constraining the cable sheath to the tip of the stress cone by the tightening force wound around the tape. The cable sheath is constrained to the bracket of the main body. However, even in this conventional cable terminal connection portion, there is a problem that the tightening force of the tape and the wire decreases with time, and the cable sheath is liable to be displaced.

  An object of the present invention is to provide a power cable terminal connection portion that can prevent a cable sheath from being displaced from a connection portion main body.

  In order to achieve the above object, the present invention includes a connection portion main body to be attached to a power cable terminal portion, and a strip-shaped processing portion formed in a part of the connection portion main body, and the strip-shaped processing portion includes the power cable. The cable sheath is fixed by a frictional force by being brought into contact with the cable sheath and wound around the outer periphery together with the cable sheath by a frictional force.

  Further, in the present invention, the strip-shaped processed portion is formed by processing a part of the elastic member having rubber elasticity of the connecting portion main body into a strip shape, or is elastic having part of the connecting portion main body. A strip-shaped member formed into a strip shape by integral molding with the member is preferable.

  Furthermore, in the present invention, it is preferable that the press-wound tape itself has adhesiveness or has an adhesive layer.

  In the present invention, the strip-shaped processed portion may be made of linen cloth or cotton cloth embedded in the elastic member.

  According to the present invention, the cable sheath can be firmly held by the frictional force of the strip-shaped processed portion of the connection portion main body, and the displacement of the cable sheath from the connection portion main body can be prevented even in long-term use. it can.

It is a fragmentary sectional view which shows roughly the example of 1 structure of the termination | terminus connection part for electric power cables which is typical embodiment which concerns on this invention. It is a cross-sectional enlarged view which shows a part of terminal connection part for electric power cables which concerns on this invention. It is the schematic which shows schematically the stress cone of one structural member of the termination | terminus connection part for electric power cables which concerns on this invention. It is a fragmentary sectional view which shows roughly the structure of the termination | terminus connection part for the conventional power cable.

  Preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

  In FIG. 1, reference numeral 1 generally indicates a typical example of a power cable termination connection portion. The terminal connection portion 1 is used, for example, in a salt damage area, and a power cable terminal portion 3 that has been stripped is fitted and fixed in a connection portion main body 2.

  The basic configuration of the connecting portion main body 2 according to the illustrated example is composed of four constituent members, that is, a compression terminal 2a, a soot tube 2b, an insulating compound 2c, and a stress cone 7, as in the conventional power cable terminal connecting portion shown in FIG. Become. In the power cable terminal connection portion 1, except for the stress cone 7, which is a main constituent member, substantially the same members as those of the conventional connection portion main body and the cable shown in FIG. 4 are used. Accordingly, the same member names and symbols are assigned to substantially the same members as those of the conventional connecting portion main body and the cable shown in FIG.

  As shown in FIG. 1, the conductor 3a of the power cable terminal portion 3 is compressed or pressure-bonded in the base end portion of the compression terminal 2a attached to the distal end portion of the tub tube 2b, and the compression terminal 2a and the power cable terminal portion 3 Is connected. The soot tube 2b is made of an insulating material such as porcelain or polymer. A cylindrical stress cone 7 base end portion is inserted and fixed in the base end portion of the soot tube 2b, and a bracket 6 is fixed to the outer periphery of the stress cone 7 base end portion. The insulating tube 2b is filled with an insulating compound 2c.

  The stress cone 7 is preferably composed of a rubber material such as ethylene propylene rubber or silicone rubber, which is a material having a large tensile strength and elongation rate, in order to be in close contact with the insulator 3b.

  As shown in FIGS. 1 and 2, a strip-shaped processed portion 7a obtained by molding a rubber material into a strip shape is formed on the stress cone tip portion 7c. The strip-shaped processed portion 7a is composed of a pair of opposing elastic pieces having a strip arc shape extending from the stress cone tip portion 7c, and the cable sheath 3e is attached to the cable sheath 3e with a frictional force applied to the cable sheath 3e. The cable sheath 3e has a function of preventing the cable sheath 3e from being detained from the connecting portion main body 2.

  As shown in FIG. 3, the surface of the stress cone 7 bulges outward in a concavo-convex shape, and a circular insertion hole 7 b for inserting the power cable terminal portion 3 is formed at the center thereof. The stress cone tip 7c has a cylindrical shape, and its outer peripheral surface is a tape winding surface. In FIG. 3, a pair of strip-like processed portions 7a and 7a extending at equal intervals from the peripheral wall of the stress cone tip portion 7c are integrally connected. The strip-shaped processed portion 7a can be formed of one member by forming the stress cone tip portion 7c into a strip arc shape. The processing method is formed by using an integral mold having the shape of the stress cone 7 and the shape of the strip-shaped processing portion 7a. Further, the cylindrical shape of the stress cone tip 7c may be formed by cutting a slit into a circular arc shape. Further, the strip-shaped processed portion 7a may be formed by integral molding with the stress cone 7 using an integral mold so as to have a desired shape by using a strip-shaped member made of the same material as the rubber material of the stress cone 7 or a different material. Good. The strip-shaped processing portion 7a is not limited to the illustrated example, and may be one or three or more.

  The cable sheath 3e is fixed by a frictional force with the strip-shaped processing portion 7a by winding the press-winding tape 5 around the outer periphery of the cable sheath 3e on which the strip-shaped processing portion 7a is disposed. Thereby, a strong cable holding function can be exhibited. The strip-shaped processed portion 7a is preferably made of a material that can easily come into close contact with the cable sheath 3e. For example, a rubber material such as ethylene propylene rubber or silicone rubber is preferably used as the material. Further, as another example of the strip-like processed portion 7a, for example, if a material made of linen or cotton cloth embedded in the rubber material is used, the effect as the cable retaining member can be further exhibited.

  A material having good adhesion to the cable sheath 3e is used for the press-winding tape 5. As the material of the tape 5, for example, a polyethylene tape, an ethylene propylene rubber tape, a chloroprene rubber tape, or the like that has an adhesive property or has an adhesive layer is preferable. When winding the holding tape 5, it is preferable to pull the tape 5 so that the frictional force between the strip-shaped processed portion 7 a and the cable sheath 3 e is sufficiently applied, and wind the tape 5 so that tension is applied.

  In order to insert and attach the power cable terminal portion 3 to the power cable terminal connection portion 1, first, the cable sheath 3e of the cable 3 is peeled off, and the conductor 3a, the insulator 3b, the external semiconductive layer 3c, and the copper tape The steps are sequentially peeled so that 3d is exposed. Next, the power cable terminal portion 3 is formed by soldering the ground wire 4 to the copper tape 3d. Then, the stepped power cable terminal portion 3 is inserted into the stress cone insertion hole 7 b constituting the connection portion main body 2 of the power cable terminal connection portion 1. Next, the stress cone 7 base end portion is inserted and fixed in the base end portion of the soot tube 2b constituting the connecting portion main body 2, and the insulating compound 2c is filled in the soot tube 2b. Furthermore, a stress cone tip 7c whose outer peripheral surface located on the outer semiconductive layer 3c side and the copper tape 3d side is a tape winding surface, a pair of strip-shaped processed portions 7a integrally formed with the stress cone 7, and The press-wound tape 5 is pulled across the outer periphery of the cable sheath 3e, and while being applied with tension, the strip-shaped processed portion 7a and the cable sheath 3e are wound a plurality of times so that a frictional force is sufficiently applied. Next, the base end portion of the soot tube 2 b is attached to the bracket 6. By performing such an operation, the attaching operation of the power cable terminal connection portion 1 and the power cable terminal portion 3 is completed.

  Hereinafter, the effectiveness of the power cable termination connection unit 1 in the above embodiment will be further described.

  A cable having an outer diameter of about 30 mm is used as the cable sheath 3e, and has a power cable terminal connection portion 1 shown in FIG. 1 (hereinafter referred to as “implemented product”), and a conventional power cable terminal shown in FIG. The following evaluation test was carried out using a cable (hereinafter referred to as “conventional product”) having the connection part 1. At the time of the evaluation test, a cylindrical shape is cut and slit into the shape of a strip arc with the same material as that of the stress cone 7 which is the actual product. The one formed by ethylene propylene rubber having a length of 45 mm and a length of 20 mm was used. The conventional product is the same material and the same size as the actual product, and the strip-shaped processed portion 7a is not formed.

  The conditions of the evaluation test were as follows: a weight having a weight of 98 N was hung at one end of each of the implemented product and the conventional product, and the state of the suspended cable was confirmed. Assuming outdoor use, under a temperature condition of about -15 ° C to 70 ° C, each of the upper and lower temperatures was 2 hours each, and this was repeated as 30 cycles, and the state of the suspended cable was confirmed. . In the conventional product, the cable dropped in the first cycle. In the actual product, the cable was stable without dropping even after 30 cycles.

(Effect of embodiment)
According to the power cable terminal connection portion 1 having the above configuration, the following effects can be obtained.
(1) In the conventional product, the cable sheath 3e is constrained to the stress cone tip 7c by the wrapping force of the holding tape 5 or the like. However, since the force for constraining the cable sheath 3e is small, the cable in the cable longitudinal direction Deviation due to contraction of the sheath 3e was likely to occur. On the other hand, in the actual product, the strip-shaped processed portion 7a constituting the connecting portion main body 2 is wound around the cable sheath 3e with the press-wound tape 5 and restrained, whereby the strip-shaped processed portion 7a and the cable sheath 3e are restrained. A frictional force acts between them, and the frictional force can prevent the cable anticorrosion layer 3e from being displaced from the connection portion main body 2.
(2) Press against two structures including a combination structure of the strip-shaped processed portion 7a and the cable sheath 3e, and a combined structure of the stress cone tip 7c, the pair of strip-shaped processed portions 7a, and the cable sheath 3e. By winding and constraining the winding tape 5, the frictional force between the strip-shaped processed portion 7 a and the cable sheath 3 e can be further increased, and the shift of the cable anticorrosive layer 3 e from the connection portion main body 2 can be prevented. .
(3) Since the contact area where the stress cone tip portion 7c and the strip-shaped processed portion 7a abut against the cable sheath 3e is increased and the frictional force between the stress sheath tip 7c and the cable sheath 3e is increased, the cable anticorrosion from the connecting portion main body 2 is prevented. The shift of the layer 3e can be prevented.
(4) As described above, the power cable termination connection part 1 that can withstand deterioration due to changes over time, temperature changes, etc., and can improve the soundness of the cable line and the mechanical holding strength of the connection part even in long-term use. Obtainable.

  In addition, this invention is not limited to the said embodiment and illustration example, Naturally also includes the technical range which those skilled in the art can change easily from those embodiment and illustration example. It is.

DESCRIPTION OF SYMBOLS 1 Power cable termination | terminus connection part 2 Connection part main body 2a Compression terminal 2b Fence pipe | tube 2c Insulation compound 3 Power cable terminal part 3a Conductor 3b Insulator 3c External semiconductive layer 3d Copper tape 3e Cable sheath 4 Grounding wire 5 Holding winding tape 6 Bracket 7 Stress cone 7a Strip-shaped processing portion 7b Stress cone insertion hole 7c Stress cone tip

Claims (5)

  A connection portion main body to be attached to the power cable terminal portion, and a strip-shaped processing portion formed in a part of the connection portion main body, the strip-shaped processing portion being brought into contact with a cable sheath of the power cable; An electric power cable terminal connecting portion, wherein the cable sheath is fixed by frictional force by winding a press-wrapping tape around the outer periphery together with the sheath.   The terminal connection part for electric power cables according to claim 1, wherein the strip-shaped processed part is formed by processing a part of the elastic member having rubber elasticity of the connection part main body into a strip shape.   2. The terminal for a power cable according to claim 1, wherein the strip-shaped processed portion is a strip-shaped member formed and processed into a strip shape by integral molding with a part of the elastic member having rubber elasticity of the connection portion main body. Connection part.   The terminal connection part for electric power cables according to claim 1, wherein the press-wound tape itself has adhesiveness or has an adhesive layer.   4. The power cable terminal connection portion according to claim 1, wherein the strip-shaped processed portion is made of linen cloth or cotton cloth embedded in an elastic member. 5.

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