JPS603626Y2 - cable termination box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a cable termination box used for forming the termination of a high voltage emergency cable of 22 kV to 154 kV class, for example.

In recent years, so-called slip-on cable terminations have been widely used, in which a treated cable terminal is inserted into a cable termination box that is prefabricated in a factory.

As shown in FIG. 1, this slip-on type termination is such that once the cable termination 1 is inserted into the cable termination box 2, it cannot be removed, and by taking certain measures, the slip-on termination can be connected to the plug 3. The receptacle 4 is configured to be unlocked.

By the way, in a general cable termination section, the plug, that is, the cable terminal section 1, is not removed from the cable termination box 2 unless an accident occurs, but if the cable is an emergency cable, it is removed relatively frequently. It is often removed.

Therefore, at the slip-on type cable termination part of the emergency cable, there is a possibility that the receptacle 4 may be worn out.
This needs to be inspected or replaced regularly.

These inspections or replacement operations are performed by sliding the conductive metal rod 5 down to a position near the annular bottom plate 6. When the lower end of the metal rod 5 is slid down to a position near the annular bottom plate 6, Since the O-ring 8a disposed between the metal pipe 7 protrudes from the lower end of the metal pipe 7, there is a problem in that the insulating mixture 10 filled in the sleeve 9 leaks.

The present invention was developed with this in mind, and is designed to prevent the insulation mixture from leaking out even when the metal rod is slid down near the annular bottom plate without removing the insulation mixture inside the sleeve. It is an object of the present invention to provide a cable termination box that can be used to inspect or replace receptacles.

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

The cable termination box according to the present invention, as shown in FIG. 2 in which the same parts as in FIG. , an annular bottom plate 6 arranged below the metal rod, and a hard insulating seat 11 provided so that the metal rod can slide on the outer periphery of the metal rod and fixed to the outer periphery of the annular bottom plate 6. A metal pipe 7' fixed to the pipe 7', a mantle 9 surrounding these structures with a required gap and having its lower end fixed to the annular bottom plate 6, and an upper metal fitting provided at the top of the mantle. 12, a retaining fitting 13 that is attached to the upper fitting and holds the tip of the conductive metal rod 5' in a vertically movable manner; and an O-ring 8 disposed inside the metal rod 5' and the metal pipe 7'.
av8b and an insulating mixture 10 filled in the sleeve 9, and an annular locking tool 14 that can enlarge the diameter of the receptacle 4 is provided on the inner periphery of the lower end of the metal pipe 5'. ing.

An engager 15 having a step is protruded from the lower end of a conductive metal rod 5' formed of a round copper rod or the like, and this engager has a receptacle 4 made of a finger socket or the like having a garter spring 16 on its outer periphery. One end of is locked.

An upwardly extending ring 17 is installed near the inner peripheral edge of the annular bottom plate, and the lower end of a hard insulating seat 11, which is molded and coated with epoxy or the like, is sandwiched between the outer circumference of the metal pipe 7' and firmly secured. It is fixed.

Upper and lower auxiliary metal fittings 18a and 18b are joined to the upper and lower parts of the cannula 9, which are stronger than insulator pipes, respectively, by cementing. It has been concluded.

An annular sealing fitting 19 is firmly fixed to the upper fitting 12 with a bolt, and an annular retaining fitting 13 is disposed on the upper part of the sealing fitting 19.

The metal rod 5' has a threaded portion 20 provided at its tip;
It is fastened to the upper metal fitting 12 by screwing threaded parts formed on the inner periphery of the fastening metal fitting 13 together.

As shown in FIG. 3, the unit-type cable termination box 2 formed as described above has a cable terminal section with a bullet-shaped plug 22 attached to the tip of the conductor 21, which is exposed by peeling off the end. 22 is inserted, thereby inserting the plug 22 into the receptacle 4.

In addition, when inserting the cable terminal part 23, a stress cone 26 is attached in advance to the outer periphery of the cable insulator 24, spanning between the cable semiconductive layers 25, and a push metal fitting 27 is brought into contact with the inclined surface of the stress cone. There is.

On the inclined surface of the stress cone 26, a protective fitting 29 whose lower end is sealed by taping 28 is compressed and compressed between the push fitting 27 and a stop fitting 30 which is engaged with the inner periphery of the middle part of the protective fitting 29. A pressing force is applied by the spring 32.

Next, after assembling the cable termination part based on FIG. 4, if necessary, attach the cable termination part 23 to the cable termination box 2.
This section describes how to remove the receptacle 4 from the receptacle 4, and how to inspect or replace the receptacle 4.

That is, when removing the cable terminal part 23,
First, the bolt 33 of the retainer 13 is loosened, and at the same time, the retainer 13 is lifted upward a predetermined distance by rotation.

Next, when the loosened bolt 33 is tightened, the metal rod 5' is lowered because the retaining fitting 13 and the metal rod 5' are integrated by the threaded portion.

When the metal rod 5' is lowered, the lower end of the receptacle 4 comes into contact with the locking tool 14, and when the metal rod 5' is further pushed down, the receptacle 4 expands in the radial direction, and the lock between the plug 22 and the receptacle 4 is released.

This accomplishes removal of the cable end 23.

The unlocking of the plug 22 and the receptacle 4 is not limited to the above-mentioned embodiment, and for example, as will be described later, the locking and unlocking of the plug 22 and the receptacle 4 are
This may be done after removing the retaining fittings 13, upper fittings 12, and other component parts that fix the parts.

In the above embodiment, a finger socket type receptacle is used as the receptacle, but the present invention is not limited to this. For example, a socket 34 as shown in FIG. 5a may be used. You may.

Inside this socket, an elastic conductive material band is provided with a plurality of longitudinally inclined elastic cut pieces distributed in the longitudinal direction, and is wound into a cylindrical shape with the cut pieces facing inside. A contact structure (not shown) configured with a structure is housed therein.

A ring 36 having a slit 35 shown in FIG. 5C is fixed to the outer periphery of the socket 34 with screws 37.

In this embodiment, in the conductor connecting portion, when the metal rod is pushed down in the same way as described above, only the slit ring 36 expands in the radial direction, thereby unlocking the conductor.

Note that the socket 34 and the ring 36 may be integrally formed in advance.

Next, as shown in FIG. 6, the rain cover 38, retaining metal fitting 13, upper metal fitting 12, and locking metal fitting 14 are removed, and the auxiliary rod 39 is screwed into the threaded portion 20 formed on the outer periphery of the upper end of the metal rod 5'. death,
Slide the receptacle 4 down to a position near the annular bottom plate 6.

Since the receptacle 4 is exposed in this way, the receptacle 4 can be inspected or replaced if necessary.

In the present invention, even when the lower end of the metal rod 5' is lowered to a position near the annular seat plate 6 as shown in the figure, at least one O-ring 8b provided between the metal rod 5' and the metal pipe 7' is removed. is always set within the metal pipe 7', so that the insulating mixture 10 is not exposed.

In order to prevent the metal rod 5' from being lowered too far down, it is desirable to provide a stopper plate 40, indicated by a two-dot chain line, at an appropriate position on the auxiliary rod 39.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view of the main part of a conventional cable termination section, Fig. 2 is a longitudinal sectional view of the cable termination box according to the present invention, Fig. 3 is a partially cutaway longitudinal sectional view of the cable terminal section, and Fig. 4 is a longitudinal sectional view of the main part of a conventional cable termination section. , FIG. 5A is an enlarged view of the main part of FIG. 2, FIG. The figure is an explanatory diagram showing a state in which the metal rod is slid down. 2... Cable termination box, 4... Receptacle, 5'... Conductive metal bar, 6...
・Annular bottom plate, 7...Metal pipe, 8a, 8
b... O-ring, 9... Mantle, 12.
... Upper metal fitting, 13 ... Closing metal fitting, 10
...Insulating mixture, 14...Latching tool, 2
1... Conductor, 22... Plug, 24...
...Insulator, 26...Stress cone.

Claims (1)

[Scope of utility model registration request] a conductive metal rod having a radially expandable receptacle disposed at its lower end; an annular bottom plate disposed below the metal rod; and a conductive metal rod provided on the outer circumference of the metal rod such that the metal rod can slide , and a metal pipe fixed to the annular bottom plate through a hard insulating seat fixed to its outer periphery, surrounding these structures with a required gap, and having its lower end attached to the annular bottom plate. The assembled state of the fixed mantle, the upper metal fitting provided at the top of the mantle, the insulating mixture filled in the mantle, and the cable termination, and the metal rod being slid down to a position near the annular bottom plate. In this state,
Cable termination box, characterized in that it comprises at least one O-ring, at least one of which is arranged between the metal rod and the metal pipe.