JPS608508Y2 - slip-on connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a slip-on cable connection section suitable for detachably connecting, for example, a 22 kV to 154 kV class high voltage cable.

In general, cable plug-in connections are mainly used for power distribution lines, but recently cable plug-in connections have been made for 22kV to 22kV to
Slip-on connections tend to be frequently used for connections of 54kV class high voltage cables.

Conventionally, this slip-on connection has been constructed by tightly fitting a plug 4 compressively connected to the tip of a cable conductor 3 into a finger socket 2 in a sleeve body 1, as shown in FIG.

This type of connection is required to have insertion and withdrawal force within a range that allows for attachment and detachment, but on the other hand, the axial force of the cable, that is, the withdrawal force due to the cable's own weight, thermal expansion and contraction, electromagnetic repulsion at the time of short circuit, etc. required to withstand.

However, this type of cable has the disadvantage that the cable cannot be completely restrained with a cleat or the like because of the effects of wrinkles in the metal shielding layer, for example, copper tape, and cold flow in the vinyl anticorrosion layer.

Therefore, when a load of several hundred kilograms is applied to the cable due to thermal expansion and contraction or repulsive force during a short circuit, there is a high risk that the cable end will be pulled out, resulting in a melting accident.

In addition, Japanese Utility Model Publication No. 48-3232 discloses that a thread groove is formed on the inner surface of the plug insertion hole of the internal electrode, and an enlarged part with an outer diameter larger than the hole diameter of the stress cone is formed on the outer periphery of the plug, so that the plug of the internal electrode can be inserted. After inserting a plug into a hole, a ring with a thread groove formed on the outer periphery is screwed into the back side of the enlarged part of the plug, thereby locking the enlarged part of the plug to the ring and preventing it from being pulled out. On connections are shown.

However, with such a connection, if it becomes necessary to replace the stress cone, the plug part must be cut off because the enlarged part of the plug gets caught in the center hole of the stress cone and cannot be removed. There was a problem.

The present invention was developed based on the above-mentioned circumstances, and by supporting the plug with a retainer that is movably fixed to the internal electrode of the insulation reinforcing body, the cable can be completely restrained within the cable connection part, and the plug can be disconnected. This provides a slip-on cable connection that can be disassembled without any trouble.

Hereinafter, the present invention will be explained based on the drawings of one embodiment.

In FIG. 2, the slip-on cable connection section according to the present invention mainly consists of the weight to be connected, a cable terminal section 7 with a plug 6 provided at the tip of the conductor 3', and a holding fitting 8 that supports the plug. ing.

The connected object 5 includes a connecting copper rod 9, a finger socket 10 provided at the lower end thereof, an insulating reinforcing body 11 covering the lower end of the connecting copper rod and the outer periphery of the finger socket, and integrally attached to the inner periphery of the connecting copper rod 9. It is mainly composed of internal electrodes 12.

The insulation reinforcing body 11 is made of, for example, epoxy, and has a conical opening 14 in close contact with a conical portion of a stress cone 13, which will be described later, near its bottom end.

The internal electrode 12 is made of aluminum, for example, and has an upper metal fitting 15 fastened to its upper part with a bolt 16, and a screw 17 formed on the inner periphery of the lower part.

The cable terminal section 1 consists of a conductor 3' and an insulator 18 exposed by stripping the cable end, a stress cone 13 attached to the outer periphery of the cable insulator via a spring (not shown), and a cable conductor 3. 'It mainly consists of a plug 6 fixed to the tip.

The holding fitting 8 has a hollow cylindrical shape as shown in FIG.
7' is formed, and a number of latching holes 20 are formed on the lower surface side 19.

The plug 6 is formed of a copper rod or the like, and as shown in FIG. The plug connection body 21 has a diameter and has a screw 22 formed on the outer periphery of the lower end, and the plug connection body 21 has a larger outer diameter than the center hole of the stress cone 13 screwed onto the outer periphery, that is, passes through the center hole of the stress cone 13. It is composed of an impossible diameter increasing body 23.

Formation of the slip-on connection is done as follows.

That is, the cable end portion 7 is inserted into the object to be connected 5 and the plug 6 is fitted into the finger socket 10.

Next, insert the retaining metal fitting 8 that has been inserted into the outer circumference of the cable in advance.
Screw it onto the screw 17 of the internal electrode 12.

To move the retainer 8 upward, the hook portion 25 of the two-split clamp 24 shown in FIG. done by

After the upper surface side 26 of the restraining metal fitting 8 is locked to the lower end side 27 of the plug, the tightening metal fitting 24 is removed and the stress cone 13 that has been previously fitted onto the outer circumference of the cable and placed at the lower position is removed.
is lifted to the top and pressed by the push pipe 2B via a spring (not shown) so that the conical part of the stress cone is brought into close contact with the conical opening 14 of the insulation reinforcement 11.

In addition, in the figure, 29 is a garter spring, 30 is a conductor fixing metal fitting, 31 is a lock nut, 32 is a bolt, 33 and 34 are O-rings, 35 is an embedded metal fitting, 36 is a bell mouth-shaped semiconductive layer, 37 is a stopper, 38 is a cable semiconducting layer, and 39 is a cable shielding layer.

In the above-mentioned slip-on cable connection part of the present invention, the lower end of the plug is supported by the retainer that is fixed to the inner circumference of the internal electrode so that it can move forward and backward, so that the cable's own weight,
It is possible to provide a slip-on cable connection part that can completely restrain the cable from being pulled out due to thermal expansion and contraction, repulsive force, and the like.

The present invention has a structure that allows the cable end to be restrained inside the connected object, so there is no need to perform special processing on the cable head frame or attach special equipment as in the past. Can be made compact.

Furthermore, in this invention, when the cable is installed upright on a steel tower, it is possible to suspend the conductor at one point.
There is no need to intentionally use a cable with a tension member or to support the cable with a large number of cleats, as in the past.

Also, when disassembling, perform the formation method in the reverse order as described above.
By removing the diameter increasing body 23, the stress cone 13 can be removed without cutting the plug connection body 21.

In addition, although the above-mentioned embodiment describes only the gas termination box, the present invention is not limited thereto, and can be applied to, for example, an intermediate connection, an air termination, or an oil termination type slip-on cable connection. You may.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway sectional view of a conventional slip-on type gas termination box, Fig. 2 is a cutaway sectional view of the main part of the slip-on cable connection part of the present invention, and Fig. 3a is a sectional view of the restraining metal fitting. 4 is a sectional view showing another embodiment of the plug, and FIG. 5 is a perspective view of the plug fastening fitting. 3'... Cable conductor, 5... Connected object, 6... Plug, 7... Cable terminal, 8... Holder Metal fittings, 9... Copper rod for connection, 10... Finger socket, 11...
...Insulation reinforcement body, 12...Internal electrode, 13
... Stress cone, 18 ... Cable conductor, 20 ... Latching hole, 21 ... Plug connection body, 23 ... Diameter increase body.

Claims (1)

[Scope of utility model registration request] Strip the end of the cable and attach a plug to the exposed conductor.
Cable terminals each having a stress cone attached to the outer periphery of the insulator via a spring, a connecting copper rod with a finger socket at the end, and a connecting copper rod provided on the outer periphery of these, and the connecting copper rod on the inner periphery. An insulating reinforcing body having an internal electrode that is electrically connected to the rod is inserted into the connected body, and a thread groove is formed on the inner surface of the plug insertion hole of the internal electrode, and a conductor is formed around the plug. A connection body having an insertion hole and a threaded groove formed on the outer periphery and having an outer diameter smaller than the hole diameter of the stress cone, and a hole diameter of the stress cone that is screwed to the outer periphery of the connection body and has threaded grooves formed on the inner and outer peripheral surfaces. A slip-on connection section characterized in that the slip-on connection section is formed of a diameter-increasing body having a larger outer diameter, and the plug is screwed onto the internal electrode.