JP4589423B2 - Protective cover for conductor fitting for power cable and conductor connecting part for power cable using the same - Google Patents

Description

  The present invention relates to a protective cover for power cable conductor connection fittings and a power cable conductor connection portion using the same.

  As a terminal connection part of a high-voltage power cable, a conductor connection part of a power cable in which a power cable conductor connection fitting (hereinafter referred to as a conductor connection fitting) is attached to the cable conductor, and this conductor connection fitting is, for example, Y-shaped There is a Y-branch termination connection part provided with a branch connection by being inserted into a connection part body having a branch structure. The conductor connection metal fitting is, for example, a cylindrical metal conductor that is externally fitted to a conductor exposed from the terminal portion of the power cable, and has a substantially central portion for good electrical contact with the connection portion main body. The energizing contact is provided.

  When the conductor connection portion of the power cable is inserted into the connection portion main body, if the inner peripheral surface of the connection portion main body is scratched or metal powder is attached with the conductor connection fitting, the electrical characteristics of the connection portion main body are significantly deteriorated. Therefore, a cylindrical plastic protective cover (hereinafter referred to as a protective cover) is provided on the conductor portion of the conductor connection fitting, and the cover is removed after the conductor connection portion of the power cable has been inserted into the connection body. There is a method for assembling the connecting portion (for example, see Patent Document 1).

The protective cover shown in Patent Document 1 is configured so as to be divided into two in the radial direction. After manually attaching the protective cover to the conductor portion of the conductor connection fitting, an adhesive vinyl chloride resin admixture tape (hereinafter referred to as “the cover”) is used. (Referred to as a tape), the conductor connecting portion of the power cable is inserted into the connecting portion main body, and then the operator peels off the tape and slides the cover to remove it.
JP 2003-189453 A

  However, according to the conventional protective cover, it is necessary to wrap the tape for fixing to the conductor connection fitting, and it is necessary to have a space for sliding the protective cover off after the connection work.

  Accordingly, an object of the present invention is to provide a protective cover for a conductor connecting bracket for a power cable that does not require tape for mounting and does not require a space for removing unnecessary portions from the conductor connecting bracket, and for a power cable using the same. The object is to provide a conductor connection.

  In order to achieve the above object, the present invention provides a cover body that is attached to a conductor exposed from a terminal portion of a power cable and that is attached to a leading end side of a conductor fitting having a current-carrying contact on the surface thereof, and the cover body. An energizing contact protector provided so as to be integrated and cover the outside of the energizing contact and provided so as to be separable from the cover main body by breaking the connecting portion with the cover main body. Provided is a protective cover for a conductor connecting metal fitting for a power cable.

  In the protective cover for the conductor connecting bracket for power cable, the cover body is preferably made of a thermoplastic resin or synthetic rubber made of a softer material than the insulator that forms the connecting portion body for connecting the conductor connecting bracket. Further, the energizing contact protector may be fitted and coupled to the cover body. In addition, the energizing contact protector may be provided with one or more perforations or slits in the axial direction, and the inner diameter is preferably larger than the outer diameter of the cover body.

  In order to achieve the above object, the present invention is attached to a conductor exposed from a terminal portion of a power cable, a conductor connection fitting connected to the conductor, and a tip end side of the conductor connection fitting. A power cable conductor connecting portion, comprising: a protective cover main body of the power cable conductor connecting metal fitting according to any one of? 5.

  According to the protective cover for the conductor connecting bracket for power cable and the conductor connecting portion for power cable using the same according to the present invention, no tape is required for mounting and no space for removing unnecessary parts from the conductor connecting bracket is required. Can be.

[First Embodiment]
FIG. 1 is a schematic view showing a conductor connecting portion for a power cable according to the first embodiment of the present invention.

  The power cable conductor connection portion 1 includes a conductor connection fitting 3 attached to the conductor 10a of the power cable 10 by a bolt 2 and a pre-molded stress cone 4 provided at the terminal portion of the power cable 10 adjacent to the conductor connection fitting 3. A cable protection bracket 6 provided adjacent to the pre-molded stress cone 4 and having a flange 5 screwed to a connecting portion main body, which will be described later, and a predetermined outer layer of the power cable 10 from the other end of the cable protection bracket 6. A waterproof processing unit 7 is provided for waterproofing and insulating the long portion.

  FIG. 2 is a partially enlarged view showing a conductor connecting metal fitting of the power cable conductor connecting portion shown in FIG. 1. In FIG. 2, a partial cross-sectional view is shown for ease of explanation.

  The conductor connection fitting 3 is provided with a cylindrical fitting body 31 having a hole (not shown) into which the conductor 10a is inserted at the center, and a plurality of contacts arranged in an annular shape on the outer periphery of the substantially central portion of the fitting body 31. A contact 32 and a mounting portion 3A provided for mounting a protective cover 33, which will be described later, on the front end side of the metal fitting body 31 are provided. A protective cover 33 is provided on the mounting portion 3 </ b> A so as to surround and cover the front end side outer peripheral surface of the metal fitting body 31 and the outer periphery of the energizing contact 32 by being fitted. The conductor connection fitting 3 and the conductor 10a are brought into close contact with each other based on a wedge-shaped fastening member (not shown) provided between the conductor connection fitting 3 and the conductor 10a and a bolt 2 screwed to the tip of the conductor connection fitting 3. Thus, the conductor connection fitting 3 is fixed to the conductor 10a.

  3A and 3B show a protective cover of the power cable conductor connection fitting according to the first embodiment of the present invention, in which FIG. 3A is a side view, and FIG. 3B is a view seen from the B direction of FIG. (c) is sectional drawing in CC part of (b).

  The protective cover 33 has a cylindrical cover main body 331 whose tip is formed in a curved surface, and an inner diameter larger than that of the cover main body 331 and is formed thinner, and connection pieces 332A and 332B which are connection portions with the cover main body 331. And a ring-shaped energizing contact protection part 333 partially connected to the cover main body 331.

  The cover main body 331 is formed so as to be attachable to the mounting portion 3 </ b> A of the conductor connection fitting 3, and the energizing contact protector 333 is formed with a size that the inner diameter surrounds and protects the outer periphery of the energizing contact 32. Yes. Further, the cover main body 331 is formed in the mounting portion 3A of the metal fitting main body 31 smaller than the outer diameter of the energizing contact 32 with the same size as the outer diameter of the energizing contact 32 or a thickness that is slightly smaller.

  The energizing contact protector 333 is a connecting piece immediately before connecting the conductor connection fitting 3 to the connecting portion main body 20 shown in FIG. 4 which constitutes the Y branch termination connecting portion for power cable together with the conductor connecting portion 1 for power cable shown in FIG. By rupturing 332A, 332B, the cover body 331 is separated and removed. Further, the cover main body 331 is left in a state where it is mounted on the mounting portion 3A of the conductor connection fitting 3. Note that the attachment of the cover body 331 to the conductor connection fitting 3 is not limited to fitting, but may be performed by adhesion or screwing.

  The energizing contact protector 333 is connected to the cover main body 331 at two locations by the connection pieces 332A and 332B, but may be configured to be connected at three or more locations.

  The protective cover 33 is made of a material that is softer than the insulator 22 to be described later so as not to cause damage such as scratches on the connection portion body 20 side due to contact with the connection portion body 20. For example, when the insulator 22 is an epoxy resin, the protective cover 33 is preferably a thermoplastic resin or a synthetic rubber. Examples of this include polyethylene resins (high density, medium density, low density), cross-linked polyethylene, vinyl chloride resin, polypropylene resin, polyacetal resin and other thermoplastic resins, chloroprene rubber, fluoro rubber, silicone rubber, EP rubber, nitrile rubber, etc. There is a synthetic rubber.

  FIG. 4 is a cross-sectional view partially showing a connecting portion main body of the Y branch termination connecting portion for the power cable.

  The connection portion main body 20 includes, for example, an embedded fitting 21 configured to be Y-branched, an insulator 22 having a plurality of openings to be described later, and provided so as to surround the embedded fitting 21, and an insulator 22 And a protective case 23 provided so as to cover the surface.

  The embedded fitting 21 is made of a conductor such as copper or copper alloy, and is formed in an insertion port 21a into which the conductor connection fitting 3 is inserted, and formed in a direction opposite to the insertion port 21a and attached to a branch destination power cable (not shown). Insertion conductors 21b and 21c into which the conductor connection fittings are inserted.

  As described above, the insulator 22 is made of an epoxy resin or the like, communicates with the insertion port 21a of the embedded metal fitting 21, and has an opening 22a into which the energizing contact 32 and the premold stress cone 4 of the conductor connection metal fitting 3 can be fitted. And openings 22b and 22c communicating with the insertion ports 21b and 21c.

  The protective case 23 is made of a conductor such as metal, and a plurality of screw holes 23a for fixing the flange 5 of the cable connecting material 1 are provided in the opening 22a.

  FIGS. 5A to 5C are diagrams illustrating a procedure for attaching the conductor connection fitting to the connection portion main body in order to assemble the Y branch termination connection portion for the power cable. Below, the attachment method to the connection part main body 20 of the conductor connection metal fitting 3 and the processing method of the protective cover 33 are demonstrated, referring FIG.1, FIG.2, FIG.3 and FIG.

  The power cable conductor connecting portion 1 shown in FIG. 1 is attached in advance to the terminal portion of the power cable 10. First, as shown to Fig.5 (a), an operator arrange | positions the conductor connection metal fitting 3 in the state by which the energization contact 32 was protected by the energization contact protection part 333 in the vicinity of the opening 22a.

  Next, as shown in FIG. 5B, the operator applies an external force to the energizing contact protector 333 of the protective cover 33 to break the connection pieces 332 </ b> A and 332 </ b> B, thereby causing the energized contact protector 333. Is separated from the cover body 331. At this time, the cover main body 331 remains as it is attached to the mounting portion 3A of the metal fitting body 31 of the conductor connection fitting 3.

  Next, the operator advances the power cable conductor connection portion 1 in the direction of the opening 22a in the state where the center of the conductor connection fitting 3 is aligned with the center of the opening 22a of the connection portion main body 20, thereby opening the opening 22a. The conductor connection fitting 3 is inserted. When the flange 5 of the conductor connecting portion 1 for the power cable comes into contact with the connecting portion main body 20, the operator screws the bolt 24 into the screw hole 23a of the protective case 23 through the screw hole of the flange 5 while maintaining the state. The flange 5 is screwed to the protective case 23 as shown in (c). As a result, the power cable conductor connecting portion 1 is fixed to the protective case 23, the energizing contact 32 of the conductor connecting fitting 3 is electrically connected to the embedded fitting 21, and the cover main body 331 is connected to the conductor connecting fitting. 3 is attached to the insertion port 21a of the connecting portion main body 20.

  Although the above description is about the connection of the terminal portion of the power cable 10, the conductor connection bracket of the power cable 10 also applies to the power cable (not shown) in which the conductor connection bracket 3 and the cover body 331 are inserted into the insertion ports 21b and 21c. 3 is connected in the same manner as the connection in FIG.

(Effects of the first embodiment)
According to the first embodiment described above, the following effects are obtained.
(1) Since the conductor connecting portion 1 for the power cable has a structure in which the cover main body 331 of the protective cover 33 is provided on the conductor connecting metal 3, even if the conductor connecting metal 3 contacts the connection main body 20, the connection main body The electrical characteristics of the connecting portion main body 20 can be satisfactorily maintained without scratching the inner peripheral surface of the 20 or attaching metal powder.
(2) Since the current-carrying contact 32 is covered with the current-carrying contact protection part 333 of the protective cover 33 of the conductor connection fitting 3 until just before the conductor connection fitting 3 is inserted into the opening 22a, the current-carrying contact 32 is outside. Can be less susceptible to mechanical damage.
(3) Since the energizing contact protection part 333 of the protective cover 33 is connected to the cover main body 331 via connection pieces 332A and 332B formed to be ruptureable by applying an external force, the conductor connection fitting 3 is When connecting to the connection unit main body 20, the connection work can be performed immediately by simply tearing off the energizing contact protection part 333 from the cover main body 331, so that the connection work is not hindered and the connection work can be performed quickly and efficiently. Can proceed well.
(4) By making the material of the cover main body 331 of the protective cover 33 softer than the material of the insulator 22 of the connecting portion main body 20, the conductor connecting metal 3 is covered with the cover main body 331 left on the metal main body 31 during the connection work. Even if the inner surface of the insulator 22 (the inner surface of the opening 22a) of the connecting portion main body 20 is rubbed, the inner surface of the insulator 22 can be prevented from being damaged.
(5) Since the energizing contact protector 333 has an outer diameter larger than the outer diameter of the cover main body 331, it becomes easier to twist the energized contact protector 333 than when both are formed with the same diameter. The energizing contact protection part 333 can be easily peeled off from the cover body 331 and separated.
(6) Since the outer diameter of the cover main body 331 is the same as the outer diameter of the energizing contact 32, the entire conductor connection fitting 3 can be tightly fixed to the connection portion main body 20. Alternatively, by making the diameter slightly smaller than the outer diameter of the energizing contact 32, there is no hindrance to the connection of the conductor contact 32 that is the connection point between the conductor connection fitting 3 and the connection body 20.

[Second Embodiment]
FIG. 6 shows the details of the connecting piece portion of the protective cover of the power cable conductor connecting metal fitting according to the second embodiment of the present invention, (a) is a partial view of the connecting piece portion, (b) ) Is an enlarged view of the connecting piece portion.

  As shown to Fig.6 (a), in 2nd Embodiment, it is set as the shape from which member width differs by the cover main body 331 side of the connection piece 332A, and the energizing contact protection part 333 side. Specifically, as shown in FIG. 6B, the width t2 on the energizing contact protector 333 side is made larger than the width t1 on the cover body 331 side. The above-described configuration is the same for the connection piece 332B (not shown).

(Effect of the second embodiment)
According to the second embodiment described above, when an external force such as torsion is applied to separate the energizing contact protection part 333 from the cover body 331, the connection piece 332A is formed with a narrow width portion of the width t1. Since it can be accurately broken, the broken portion of the connection piece 332A does not remain in a protruding shape on the cover main body 331 side, and the insulator 22 of the connection main body 20 can be made less likely to be damaged.

[Third Embodiment]
FIG. 7: is a front view which shows the protective cover of the conductor connection metal fitting for electric power cables which concerns on the 3rd Embodiment of this invention.
In the third embodiment, in the first embodiment, one or more perforations 334 are provided in the axial direction as a break assisting portion in the energizing contact protection portion 333 of the protective cover 33. The configuration is the same as in the first embodiment.

(Effect of the third embodiment)
According to the third embodiment, since the energizing contact protector 333 is strip-shaped by separating the perforation 334 by hand, the cylindrical energized contact protector without impairing the protection of the energized contact The energizing contact protection part 333 can be removed more easily than removing 333 from the cable front end side.

[Fourth Embodiment]
FIG. 8: is a front view which shows the protective cover of the conductor connection metal fitting for electric power cables which concerns on the 4th Embodiment of this invention.
In this embodiment, in the first embodiment, one or more slits 335 are provided in the axial direction as a break assisting portion in the energizing contact protection portion 333 of the protective cover 33, and the other configuration is the first configuration. This is the same as the first embodiment.

(Effect of the fourth embodiment)
Also in the protective cover 33 of the fourth embodiment, the energizing contact protection part 333 can be easily separated from the cover main body 331 in a band shape as in the third embodiment.

  The present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. For example, the energizing contact protector 333 may be connected to the cover body 331 by a structure such as screwing or fitting.

FIG. 1 is a schematic view showing a conductor connecting portion for a power cable according to the first embodiment of the present invention. FIG. 2 is a partially enlarged view showing a conductor connecting metal fitting of the power cable conductor connecting portion shown in FIG. 1. 3A and 3B show a protective cover of the power cable conductor connection fitting according to the first embodiment of the present invention, in which FIG. 3A is a side view, and FIG. 3B is a view seen from the B direction of FIG. (c) is sectional drawing in CC part of (b). It is sectional drawing which shows partially the connection part main body of the Y branch termination | terminus connection part for electric power cables. FIGS. 5A to 5C are diagrams illustrating a procedure for attaching the conductor connection fitting to the connection portion main body in order to assemble the Y branch termination connection portion for the power cable. FIG. 6 shows the details of the connection piece portion of the protective cover of the power cable conductor connection fitting according to the second embodiment of the present invention, (a) is a partial view of the connection piece portion, (b) ) Is an enlarged view of the connecting piece portion. FIG. 7: is a front view which shows the protective cover of the conductor connection metal fitting for electric power cables which concerns on the 3rd Embodiment of this invention. FIG. 8: is a front view which shows the protective cover of the conductor connection metal fitting for electric power cables which concerns on the 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electric power cable conductor connection part, 2 ... Bolt, 3 ... Conductor connection metal fitting, 4 ... Premold stress cone, 5 ... Flange, 6 ... Cable protection metal fitting, 7 ... Waterproof processing part, 10 ... Electric power cable, 10a ... Conductor 20 ... Connector body, 21 ... Embedded bracket, 21a, 21b, 21c ... Insertion port, 22 ... Insulator, 22a, 22b, 22c ... Opening, 23 ... Protective case, 23a ... Screw hole, 24 ... Bolt, 31 ... metal fitting body, 32 ... energizing contact, 33 ... protective cover, 331 ... cover main body, 332A, 332B ... connection piece, 333 ... energizing contact protecting part, 334 ... perforation, 335 ... slit

Claims (6)

A cover body that is attached to the conductor exposed from the terminal portion of the power cable and is attached to the front end side of the conductor connection fitting having a current-carrying contact on the surface;
An energizing contact protector provided integrally with the cover body and covering the outside of the energizing contact; and provided so as to be separable from the cover body by breaking the connecting portion with the cover body;
A protective cover for a conductor fitting for a power cable, comprising:   The conductor cover fitting for a power cable according to claim 1, wherein the cover body is made of a thermoplastic resin or a synthetic rubber that is softer than an insulator that forms a connection portion body to which the conductor fitting is connected. Protective cover.   2. The protective cover for a power cable conductor connection fitting according to claim 1, wherein the energizing contact protector is fitted and coupled to the cover body.   The protective cover for the power cable conductor connection fitting according to claim 1, wherein the energizing contact protection portion is provided with one or more perforations or slits in an axial direction thereof.   2. The protective cover for a power cable conductor connection fitting according to claim 1, wherein the energizing contact protection part has an inner diameter larger than an outer diameter of the cover body. A conductor exposed from the end of the power cable;
A conductor connection fitting connected to the conductor;
The cover main body of the protective cover of the conductor connection fitting for a power cable according to any one of claims 1 to 5, which is attached to the tip end side of the conductor connection fitting,
A conductor connecting portion for a power cable, comprising:

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