JP3352538B2 - Aerial termination box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerial terminal box disposed through a building wall for connecting a lead cable extending from an outdoor tower, for example, to indoor electrical equipment.

[0002]

2. Description of the Related Art In substations, substation facilities are sometimes housed in buildings in consideration of the environment and the like. In such a substation, in order to connect a lead cable extending from a steel tower provided outdoors to a substation facility, it is necessary to penetrate a wall of the building and draw it into the building. When the electric cable is drawn in, an aerial terminal box that is arranged to penetrate a wall is used. FIG. 2 is a schematic view of a conventional aerial terminal box. The conventional aerial terminal box 1 has a connection portion formed with a connection port for receiving a connection cable 2 extending from a substation facility arranged in a building on the indoor side. The aerial terminal box 1 extends substantially horizontally from the opening 4 of the wall 3 to the outside of the room, and is arranged with the conductor extraction rod 5 exposed at the tip. A lead cable 7 from a steel tower 6 is connected to the conductor extraction rod 5, and a connection cable 2 is inserted into a connection port from an indoor side through an opening 4, and both cables 2 and 7 are connected via the conductor extraction rod 5. Connected. Therefore, the lead cable 7 from the tower 6
Are connected to a connection cable 2 extending from a substation facility via an aerial termination box 1.

[0003]

By the way, the conventional aerial terminal box 1 is provided with a connecting portion having a connecting port on the indoor side.
The connecting cable 2 is formed substantially in a horizontal direction in a straight line to the distal end portion through which the conductor lead-out bar 5 projects through the opening of the wall body.
Will protrude greatly in the direction perpendicular to the wall by the distance from the connection end where the adhesive tape 8 for anticorrosion has been wound to the cleat 9. In addition, since the aerial termination box is provided on the upper part of the wall for safety, it is necessary to bend the connection cable extending to the indoor side, for example, by bending it downward toward the substation equipment. In order to reduce the load on the bent part,
Design conditions are set for each type of cable. According to this, for example, in the case of a 66/77 kV CV single-core cable, if the cable outer diameter is D, the design bending diameter R
Is 16D (R = 16D). Thus, for example, 6
In the case of a 6/77 kV CV single-core cable having a conductor cross-sectional area of 400 mm ² , the cable outer diameter D is 6
Since it is 6.5 mm, the design bending diameter R is 10 mm.
64 mm. To secure this bending diameter, an equivalent space is required from the wall to the indoor side, including the required distance of 1 m from the connection end where the adhesive tape for anticorrosion is wound to the cleat. And the aerial terminal box 1
A space exceeding about 2 m is required inside the wall 3 on which is installed. Moreover, this space is not constant, and varies greatly depending on the type of cable, the conductor cross-sectional area and the size of the outer diameter. Therefore, the emergence of an aerial terminal box that enables more compact wiring has been strongly desired.

[0004]

SUMMARY OF THE INVENTION The present invention is an aerial termination box disposed through a wall of a building to connect an outdoor lead cable to indoor electrical equipment, wherein the aerial terminal box is provided on the indoor side. Connect the connection cable from the equipment along the wall near the wall.
And the internal electrodes electrically connected to the cable
Connection part and penetrating through the opening of the wall at right angles from the connection part
Connecting rod that extends outside and is electrically connected to the internal electrode.
Housing an epoxy sleeve consisting of an elongate part and a connection part,
Surrounds a part of the extension, penetrates the opening and projects outside
Housing a casing with a protrusion and an extension on the outdoor side
To the connecting rod and lead cable.
A porcelain tube having a conductor withdrawal rod for electrically connecting the
It is characterized by including .

[0005]

In the vapor in the terminating box according to the present invention, on the wall ya inside
Extend to the connection portion and the outdoors, which along with accept the connection cable
Since the epoxy sleeve having the extension portion is provided, the connection cable can be linearly inserted from a direction parallel to the wall. From this, this connection cable
In without providing the bent portion, the connection cable of the wall
Wiring can be carried out in parallel with the wall surface in the vicinity .

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 is a longitudinal sectional view showing an aerial terminal box 10 according to the present invention. The aerial terminal box 10 according to the present invention is shown in FIG.
As shown in FIG. 1, a connection cable 1 extending from an electric equipment such as a transformer disposed in a building 12.
4 and a lead cable 18 extending from a power line supported outdoors on a steel tower 16.

[0007] The aerial terminal box 10 is connected to the connecting portion 20 for receiving the connecting cable 14 on the indoor side, and is connected to the connecting portion 20.
A main body 26 extends outside through an opening 24 formed in a vertical wall 22 of the building 12. Connection part 20
Is connected through a connection portion 30 having a tapered connection opening for receiving the connection cable 14 from below, that is, a connection opening 28, and an opening 24 formed in the wall 22 from the outer periphery of the connection portion 30. And an overall L-shaped cannula 34 having a tubular extension 32 that extends to the right. The sleeve 34 can be made of, for example, an epoxy resin, so that the weight of the aerial termination box can be reduced.

[0008] Outside the connecting portion 30 is a metal casing 3
6. On the other hand, inside the connection portion 30, an internal electrode 38 that is open at one end and is aligned with the connection port 28 is arranged. A connection rod 40 extending radially outward at right angles to the center axis of the internal electrode 38 is formed integrally therewith. The connecting rod 40 penetrates through the inside of the extending portion 32 of the sleeve 34 so that the tip protrudes. The base of the conductor lead-out rod 42 is compression-connected to the tip of the connection rod 40.

A generally cylindrical insulator tube 44 is disposed on the outdoor side so as to cover the extension 32, the connecting rod 40, and the conductor lead rod 42 so that their central axes coincide with each other. The porcelain tube 44 is fixed to the casing 36 at its base. Further, the distal end of the conductor lead-out rod 42 is exposed from the same shield ring 46 provided at the distal end as in the conventional case.
The lead cable 18 extending from the tower 16 is connected to the exposed end of the conductor lead rod 42. The porcelain tube 44 can be made of an epoxy resin, but is preferably made of porcelain in order to improve tracking resistance and durability.

The connection cable 14 is connected to an internal electrode 38 having a central axis perpendicular to the central axis of the insulator tube 44 via a connection port 28 opened downward. For this connection, the sheath 14A is removed from the end of the connection cable 14, the shielding layer 14B, the semiconductive layer 14C, the insulating layer 14D, and the conductor 14E are sequentially exposed, and the compression terminal 48 is crimped to the conductor 14E. ing. As in the conventional slip-on type connection structure, the compression terminal 48 has a first end engaged with the compression terminal 48 and a second end engaged with a projection 38A of the internal electrode 38 through a so-called tulip contact 50. Is reliably connected to the internal electrode 38. A stress cone 52 for obtaining a uniform electric field is arranged on the semiconductive layer 14C of the connection cable 14. The stress cone 52 is pressed against the tapered surface of the connection port 28 by a pressing ring 56 that receives the spring force of the spring assembly 54. A protective metal fitting 58 is attached to the connection end of the connection cable 14, and an anticorrosion tape 60 is wrapped around the metal fitting. Thereby, the connection cable 14
Are securely connected to the lead cable 18 in an electrically stable state.

FIG. 3 is a side view showing the aerial terminal box 10 according to the present invention. FIG. 4 is a plan view partially showing the aerial terminal box 10 according to the present invention. The aerial terminal box 10 according to the present invention, as shown in FIGS.
The bracket 62 is fixed to the base of the insulator tube 44 and is fixed to the wall 22 with brackets 62 extending in four radial directions. For this mounting, as shown in FIG. 4, a mounting portion 24A is formed at the edge of the opening 24 of the wall 22, and the mounting insulator 64 and the mounting bolt 66 penetrating therethrough are provided. The aerial terminal box 10 is fixed to the mounting portion 24A. By this attachment, the aerial terminal box 10 positions the center axis of the main body 26 including the insulator tube 44 in a substantially horizontal direction as shown in FIG. 1, and the connection port 28 of the connection section 20 faces downward. It is arranged to open.

As a result, the connection cable 14 extending from the connection portion 20 does not protrude in the room direction at right angles to the wall 22 and extends linearly downward in parallel with the wall 22.
Therefore, as shown in FIG. 1, the connection cable 14 does not have a bent portion near the connection end of the connection cable 14 to the aerial termination box 10 and does not overhang the connection cable 14 to the indoor side. The connection cable 14 can be stopped by the cleat 68 at a position closer to the wall body 22 as compared with the above, and the scaffold at the time of connection can be reduced in size. Also,
It is not necessary to form a bent portion near the connection portion of the connection cable, and a large space for this bent portion is not required,
Compact wiring becomes possible, and the building that houses the electrical equipment can be made more compact.

Although the example in which the connection cable is drawn downward in parallel with the wall has been described, the invention is not limited to this, and the connection cable may be provided in a direction substantially parallel to the wall provided with an opening that allows the aerial terminal box to pass therethrough. The connection cable can be pulled out in various directions as needed. Also, the connection between the connection cable and the connection portion of the aerial termination box has been described as a slip-on type connection structure, but the present invention is not limited to this and can be applied to various connection structures.

[0014]

As described in the foregoing, the air in the terminating box according to the present invention, Epo the connection cable from the wall parallel to the direction
Since the connection cable can be linearly inserted into the connection port of the xy tube, the connection cable can be connected without forming a conventional bent portion near the connection end of the connection cable to the aerial terminal box. Can be wired in parallel with the wall without greatly projecting toward the indoor side. Therefore, the space required for wiring does not greatly change depending on the type of connection cable, the size of the cross-sectional area of the conductor, or the size of the outer diameter. A large space is not required, and compact wiring can be achieved, and the size of a building accommodating electrical equipment can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an aerial terminal box according to the present invention.

FIG. 2 is a schematic view showing a conventional aerial terminal box.

FIG. 3 is a side view showing the aerial terminal box according to the present invention.

FIG. 4 is a plan view partially showing the aerial terminal box according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Aerial terminal box 12 Building 14 Connection cable 18 Lead cable 20 Connection part 22 Wall 26 Main part 28 Connection port 38 Internal electrode 42 Conductor lead-out rod

Claims (1)

(57) [Claims] 1. A in the air are disposed through the wall of the building to connect the outdoor lead cable for indoor electrical equipment termination box, the connection cable from the electrical equipment in the indoor side Wall
Receive along the wall in the vicinity and make electrical connection to the cable
Connection having an internal electrode connected thereto and a right angle from the connection
Extending through the opening of the wall to the outside and
Epoxy comprising an extension having a connecting rod electrically connected to the
A sheath tube , accommodating the connecting portion , surrounding a part of the extending portion,
A casing having a protruding portion that protrudes outside through an opening
And the projecting portion of the casing accommodating the extension portion on the outdoor side.
And the connection rod and the lead cable are electrically connected to each other.
Aerial termination box, characterized in that it comprises, a porcelain tube which has a conductor draw-out bar to be connected.