JPH02146916A - Assembling method of cable termination - Google Patents

Abstract

PURPOSE:To prevent warping of core by fitting the tubular section of an assembling jig to the outer circumference of an insulated core placed in an insulator while extending over a conductor lead-out section and the tip of a rubber mold stress cone thereby pressing the stress cone. CONSTITUTION:A cable termination 1 is stripped in step and a conductor lead- out rod 3 is compression adhered to a conductor 2, then a cable protective metal 4, a compression unit 5 and a rubber mold stress cone 6 are inserted sequentially from the lead-out rod 3 side of the cable termination 1. Then the cable termination 1 is cowered by an epoxy seat 7 and an insulator 8. Thereafter, a jig 19 comprising a tubular section 20 and a flange section 21 is inserted from the tip of the insulator 8 so that the tubular section 20 covers from the lead-out rod 3 to the stress cone 6. The stress cone is pressed by means of the compression unit 5 and positioned, then the jig 19 is removed. Compound is injected into the insulator a sealed by a tape 14 and the lead-out rod 3 is secured to the end section of the insulator 8 through a metal(not shown). By such arrangement, the insulated core is protected from warping resulting in the improvement of electrical characteristic.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the invention] (Industrial field of application) The present invention provides a cable termination section that allows the rising portion of a rubber molded stress cone to be properly set on the end of the cable's outer semiconducting layer. Regarding the assembly method.

(Prior Art) Conventionally, the air termination of a rubber/plastic insulated cable has been assembled using the following procedure.

That is, as shown in FIG. 2, first, the cable is set up on a cable stand to be illustrated, and the conductor pull-out rod 3 is compressed and connected to the exposed conductor 2 by stripping off the cable end portion 1 in steps. Next, the cable protection fitting 4, compression device 5, and rubber molded stress cone 6 are sequentially fitted onto the outer periphery of the cable terminal portion 1 from the conductor pull-out rod 3 side, and then the cable terminal portion 1 is covered with an epoxy seat 7 and an insulator tube 8. The lower ends of these are then installed and fixed on a pedestal.

Next, the upper metal fitting 9, the tightening metal fitting 10, the conductor fixing metal fitting 11 and the lock nut 12 are temporarily set on the top of the insulator tube 8, and in this state, the compression device 5 is tightened and the rubber molded stress cone 6 is attached to the cable terminal part. 1 toward the distal end side, and then the lower end of the cable protection fitting 4 and the cable sheath 13 are sealed with a wound layer 14 of seal tape. Then, remove the temporarily set upper metal fitting 9, tightening metal fitting 10, conductor fixing metal fitting 11, and lock nut 12, inject and fill the insulating compound 15 into the insulating tube 8, and reinstall the upper metal fitting 9 and the tightening metal fitting. 10,
The conductor fixing fitting 11 and the lock nut 12 are properly set on the top of the insulator tube 8, and these are assembled and fixed to the top of the insulator tube 8 and the conductor pull-out rod 3.

(Problem to be Solved by the Invention) However, in such a method of assembling a cable terminal part, the processing length of the cable terminal part 1 is long, and the cable has a tendency to wind the cable drum, etc. peculiar to the cable. Therefore, on the top of the insulator pipe 8, an upper metal fitting 9, a tightening metal fitting 10,
The conductor fixing fittings 11 and lock nuts 12 are temporarily set, and when tightening the compression device 5 in this state,
The insulated core 16 of the cable end 1 may be bent and the raised portion 17 of the rubber molded stress cone 6 may not be properly set on the end of the cable outer semiconducting layer 18, which may result in damage to the electrical conductivity of the cable end. The problem was that the characteristics deteriorated.

Further, when the cable size is small, since the rigidity of the cable is small, the tightening of the compression device 5 may sometimes cause the insulated wire core 16 to become slack within the insulator tube 8 and be set as is.

The present invention has been made to solve these problems, and when installing a rubber molded stress cone, the insulated wire core does not sometimes curve inside the insulated tube, and even after assembly, the insulated wire core remains straight inside the insulated tube. and, in turn,
It is an object of the present invention to provide a method for assembling a cable termination part that can improve the electrical characteristics of the cable termination part by properly setting the rising part of a rubber molded stress cone on the end of the cable's outer semiconductive layer.

[Structure of the Invention] (Means for Solving the Problems) The method for assembling a cable terminal part of the present invention provides a method for assembling a cable terminal part of the present invention, in which a wire is attached to the outer periphery of the insulated wire core of the cable terminal covered with a porcelain tube with a diameter approximately equal to the outer diameter of the insulated wire core. The cylindrical part of the assembly jig is composed of a cylindrical part having an inner diameter of the same diameter and a flange provided on the outer periphery of the upper end of the cylindrical part so as to be orthogonal to the axis of the cylindrical part. From the connection part between the extended conductor pull-out rod and the conductor exposed by stripping the cable end, insert the wire between the tips of the rubber molded stress cones that have been previously fitted onto the insulated wire core, and insert the The assembly jig is fixed to the insulator pipe and the conductor pull-out rod, and then the rubber mold stress cone is pressed toward the tip end side of the cable terminal by a pressing device fitted in advance to the outer periphery of the cable terminal. There is.

(Function) In the cable terminal assembly method of the present invention, a cylindrical part of an assembly jig having an inner diameter approximately the same as the outer diameter of the insulated wire core is attached to the outer periphery of the insulated wire core of the cable terminal. Since the wire is inserted between the tip of the rubber molded stress cone that has been previously inserted onto the insulated wire core from the connection between the pull-out rod and the conductor, even if the rubber molded stress cone is tightened by the compression device, the insulated wire core will not be damaged. There is no risk of bending within the insulator tube, and as a result, the rising portion of the rubber mold stress cone can be properly set on the end of the cable's external semiconductive layer.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a longitudinal cross-sectional view showing the state in which the outer periphery of the insulated core of the cable terminal is surrounded by the cylindrical part of the assembly jig according to the present invention. A symbol is attached.

In FIG. 1, the cable is set up on the stand to be illustrated, and the conductor pull-out rod 3 is compressed and connected to the exposed conductor 2 by stripping the cable terminal part 1, and then the cable terminal part 1 is compressed and connected to the exposed conductor 2.
The cable protection fitting 4, compression device 5, and rubber molded stress cone 6 are sequentially fitted onto the outer periphery of the conductor pull-out rod 3 side, and then the cable end portion 1 is covered with an epoxy seat 7 and an insulator tube 8, and the lower end portion of these is inserted. The installation and fixing of the cable on the frame is the same as the conventional cable termination assembly method.

In the present invention, when tightening the rubber mold stress cone 6 by the compression device 5, first, the insulated wire core 1 is
An assembly jig 19, which will be described later, is set on the outer periphery of the insulated wire core 16, thereby fixing the insulated wire core 16.

The assembly jig 19 according to the present invention includes a cylindrical part 20 made of metal or hard plastic having an inner diameter that is approximately the same as the outer diameter of the insulated wire core 16, and a cylindrical part 20 on the outer periphery of the upper end of the cylindrical part. The length of the cylindrical part 20 is insulated from the connection part between the conductor pull-out rod 3 and the conductor 2 extending from the center of the top of the insulated pipe 8. Rubber molded stress cone 6 previously fitted onto wire core 16
The length spans between the tips of the

Then, the cylindrical part 20 of the assembly jig 19 is inserted from the conductor pull-out rod 3 side until the lower end of the cylindrical part 20 comes into contact with the tip of the rubber mold stress cone 6, and then the flange 21 Both ends of the insulator tube 8 are fixed to the top of the insulator tube 8 via the bolts shown in the figure. Reference numeral 22 denotes a position regulating plate consisting of a pair of plates, etc., which pinches the upper end of the conductor pull-out rod 3 with a curved portion R formed at its center. Movement is regulated.

As described above, the predetermined length and length of the insulated wire core 16 of the cable terminal portion 1 is surrounded by the cylindrical portion 20 of the assembly jig 19, and the flange 21 of this assembly jig 19 is fixed to the insulated pipe 8 and the conductor pull-out rod 3. Then, if the rubber mold stress cone 6 is pressed toward the distal end side of the cable terminal 1 by the compression device 5, the rising portion 17 of the rubber mold stress cone 6 will be
Set properly on the cable outer semiconducting layer 18 end.

On the other hand, after the rising portion 17 of the rubber mold stress cone 6 is properly set on the end of the cable external semiconductive layer 18, the assembly jig 19 is removed, and the lower end of the cable protection fitting 4 and the cable sheath 13 are removed. The gap is sealed with a wound layer 14 of seal tape, and an insulating compound 1 is applied inside the insulating tube 8.
5, and as shown in FIG. 2, the upper metal fitting 9.
The O-ring 23, the tightening fitting 10, the conductor fixing fitting 11, and the lock nut 12 are properly set on the top of the insulator tube 8, and these are assembled and fixed on the top of the insulator tube 8 and the conductor pull-out rod 3.

Although the above-mentioned embodiment describes the case where the upward movement of the assembly jig is restricted by the position regulating plate 22, the present invention is not limited to this. For example, the cylindrical portion of the assembly jig 19 A fastening means for the conductor pull-out rod 3 may be connected to the upper end of the conductor pull-out rod 20, and the conductor pull-out rod 3 may be fixed by this fastening means.

In the figure, 24 is an upper ring, 25 is a winding layer of seal tape, 26 is
indicate the lower metal fittings.

In the method for assembling the cable end portion of the embodiment configured as described above, a cylindrical portion of an assembly jig having an inner diameter approximately the same as an outer diameter of the insulated wire core is attached to the outer periphery of the insulated wire core of the cable terminal. The cable is inserted between the tip of the rubber molded stress cone that has been previously inserted onto the insulated wire core from the connection point between the conductor pull-out rod and the conductor, so even if the rubber molded stress cone is tightened by the compression device, the cable will remain intact. There is no risk that the cable will bend within the insulator tube, and as a result, the rising portion of the rubber mold stress cone can be properly set on the end of the cable's outer semiconducting layer.

Further, by using the assembly jig according to the present invention, the cable can be easily assembled, and the electrical characteristics of the cable end can be improved.

[Effects of the Invention] As explained above, in the cable termination assembly method of the present invention, the rubber molded stress cone is sometimes attached so that the insulated wire core does not bend inside the insulated pipe, and the insulation is maintained even after assembly. Make sure the wire core fits straight inside the insulator tube,
Furthermore, the rising part of the rubber mold stress cone can be properly set on the end of the cable's external semiconducting layer, and the electrical characteristics of the cable end can be improved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory view showing how the cable of the present invention is assembled, and FIG. 2 is a longitudinal cross-sectional view of a conventional cable termination. 1・・・・・・・・・・・・・・・Cable terminal part 2・
・・・・・・・・・・・・・・・Conductor 3・・・・・・・・・
・・・・・・Conductor pull-out rod 4・・・・・・・・・・・・
・・・Cable protection fitting 5・・・・・・・・・・・・・・・
・・Compression device 6・・・・・・・・・・・・・Rubber mold stress cone 7・・・・・・・・・・・・・・・・
・Epoxy seat 8・・・・・・・・・・・・Insulator tube 9
・・・・・・・・・・・・Top metal fitting 10...
......Tightening metal fittings 11...
・Conductor fixing fitting 12......Lock nut 16...Insulated wire core 17...
・・・・・・Rising part 18・・・・・・・・・・・・
...Cable external semiconducting layer 19...
・Assembling metal fitting 0・・・・・・・・・Cylindrical part 1・・・・・・・・・Flange

Claims (1)

[Claims] A cylindrical portion having an inner diameter approximately the same as the outer diameter of the insulated wire core on the outer periphery of the insulated wire core of the cable terminal covered with the insulator tube, and a cylindrical portion having an inner diameter approximately the same as the outer diameter of the insulated wire core, and a cylindrical portion on the outer periphery of the upper end of the cylindrical portion perpendicular to the axis of the cylindrical portion. The cylindrical part of the assembly jig consisting of a flange provided as shown in FIG. The rubber molded stress cone that has been previously fitted onto the insulated wire core is inserted between the tips, and this assembly jig is fixed to the insulator tube and the conductor pull-out rod, and then the rubber molded stress cone is inserted into the cable terminal. 1. A method for assembling a cable terminal end, the method comprising pressing the cable terminal toward the distal end side using a pressing device fitted in advance onto the outer periphery of the cable terminal.