JPH0740309Y2 - Plug-in connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a cable plug-in connection to an underground equipment such as a transformer for underground burying.

[Technical background of the invention and its problems] The plug-in connection part of the cable for the underground installation type device has been used conventionally. However, the ground-installed equipment used is a large one installed in a manhole, and is limited to one that a worker can enter and operate.

However, recently, due to aesthetic problems in the streets, underground distribution lines are being advanced, and they are installed in handholes that are small and workers cannot enter inside. Equipment has come to be used a lot.

The plug-in connection portion of such a ground-installed device installed in the handhole needs to satisfy the following requirements, unlike the conventional large-sized device installed in the manhole. That is, the connection and opening / closing of the cable can be done from the ground outside the handhole, it can be used even in the flooded state, and the cable can be routed and connected in the almost full handhole just by installing the equipment. Conditions such as being possible are required.

[Object of the Invention] The present invention has been made in view of the above circumstances, and provides a plug-in type connection portion that can satisfy the above-mentioned conditions for an underground installation apparatus installed in a handhole.

[Summary of the Invention] The plug-in type connection part of the present invention has a bushing having a female side contactor mounted on an inclined upper surface plate of a casing of a device, and a movable rod which cooperates with the female side contactor is attached to the bushing. It is characterized in that the existing L-shaped plug is plug-in connected.

[Embodiment of the Invention] FIG. 1 is an overall front view of an embodiment of the present invention, and FIG. 2 is a plan view thereof. In these figures, a transformer 3 housed in a casing 2 having a top plate 2a as an inclined surface is installed in the handhole 1, and a portion near the bottom of the side wall of the handhole 1 and a casing 2 support base 4 are provided. A trunk cable 5 is laid through the space.

On the other hand, on the upper surface 2a, the primary side for two phases, which will be described later, and 2
Secondary plug-in connections 6, 7 are installed.

Since the primary side and secondary side plug-in connecting portions 6 and 7 have the same configuration, the primary side plug-in connecting portion 6 therein
The details will be described with reference to FIGS. 3A to 3C.
3A to 3C, the inclined surface 2a of the casing 2
Three bushings 9a to 9c are attached to a fitting 8 which is fixed to the fitting (not shown in these figures) by appropriate means, and female contacts are provided in each bushing. . Bushing 9a for ease of illustration and description
The internal structure will be illustrated and described. Bushing
9a is arranged so as to present a hollow cylindrical surface, and the outer peripheral surface is bundled by a ring-shaped spring 10 arranged vertically in two steps, and an inner edge portion is provided with one contact projection 11a vertically on each side. A finger type female contact 12 having a plurality of fingers 11 is provided. In addition, the upper and lower two contact projections 11a
The lower one penetrates through the bottom of the bushing 9a and is fixed to the connecting conductor 13 which is connected to the device inside the casing.
It is abutted against the inner end of the and holds the row of fingers 11 in a hollow cylindrical shape. Further, in the drawing, 8a indicates an O-ring housed in a circular groove provided corresponding to each bushing on the casing 2 side, and 14 indicates an arc extinguishing lid for closing the opening of the bushing 9a.

As described above, each bushing 9b, 9c has a similar structure.

Also, each bushing 9a-9c has two bushings 9a.
As shown by the dashed line, the male contacts P are connected in a plug-in manner. Then, at both ends of the mounting member 8, a bolt 15 which is rotatable about an axis 15a which is perpendicular to the axis of each bushing 9a to 9c and which is parallel to the plate surface of the mounting member 8, is attached.
Each of the bolts 15 has a pull-out preventing metal fitting 16 provided with a concave portion 16a on the lower surface for engaging with an opening / closing operation boss of a male side contact described later.
Both ends of the withdrawal prevention metal fitting 16 are pressed against the opening / closing operation boss by a wing nut 17 screwed to each of the bolts to prevent withdrawal of the male contact.

FIG. 4 shows a primary male contact, that is, a primary plug, which is combined with the female contact. In this figure, a fuse 19 is housed in a cylindrical waterproof cover 18, and a compression terminal 20 that is compression-connected to one phase (not shown) of a main line is fixed to one end of a casing 19a of this fuse 19 and the other. A terminal mounting conductor 21 is fixed to the end of the terminal mounting conductor 21, and a flat plate-shaped terminal mounting plate 21a protruding outside the waterproof cover 18 of the terminal mounting conductor 21 has a shaft perpendicular to the axis of the waterproof cover 18 and the finger type female. A movable rod 22 cooperating with the side contact 12 is fixed. Further, the bushings 9a to 9c are concentrically covered with a portion of the movable rod 22 that cooperates with the female contactor.
A cavity 23a that engages with the portion 23 that covers the terminal mounting plate 21
b, a rubber mold insulating cap 23 having a portion 23c that engages with the end of the waterproof cover 18 is attached to the end of the waterproof cover 18, and is tightened with a hose band 24. Further, an opening / closing operation boss 25 made of an insulating material is fixed outside the rubber mold insulating cap 23 on the opposite side of the portion of the movable rod 22 that cooperates with the female contact. Also,
A substantially conical rubber mold insulating cap 26 is attached to the end of the waterproof cover 18 on the compression terminal 20 side, and the hose band
It is fastened to the waterproof cover 18 by 27. 28 in the figure
Shows a hose band for tightening a cable (not shown) passing through the rubber mold insulating cap 26.

FIG. 5 in which the same parts as those in FIG. 4 are designated by the same reference numerals shows a secondary side plug. In this figure, the waterproof cover 18 has a relatively small axial length, and the battledore 21b of the terminal mounting conductor 21 and the battledore 20a of the compression terminal 20 are connected to each other within the waterproof cover 18. Also, rubber mold insulation cap 2
3 and 26 and the waterproof cover 18 are adhered to each other. The other configuration is similar to that of the primary side plug, and therefore its explanation is omitted.

In the plug-in connection part of the present invention having the above-mentioned configuration, since the plug-in connection part is installed on the inclined upper surface plate of the device casing, the device is installed in the handhole where the device is fully installed. Even in this case, the plug-in connecting portion can be easily attached and detached from the ground outside the handhole. Further, since the cable penetrating portion is a rubber mold insulating cap, a tape winding process is not required when connecting the plug and the cable.

Furthermore, despite the plug-in connection, the primary side,
It is impossible to open / close the load on the secondary side.

Further, since the cable to be connected only needs to be raised up to the upper surface of the equipment casing along the side wall of the handhole, the cable can be easily routed even in a narrow handhole.

In addition, in the plug-in connection portion of the present invention, it is necessary to positively rotate the wing nut 17 to disengage it from the bolt 15 and remove the pull-out prevention fitting 16 from each bolt 15. Since the plug cannot be pulled out, there is no risk of accidents due to accidental removal of the plug.

In addition, the plug-in connection part of the underground equipment of the present invention is
Since it is waterproof with a waterproof cover, rubber mold insulation cap, etc., it will not become unusable even in a flooded state.

The present invention is not limited to the above embodiment. For example, the number of connected phases is not limited to the illustrated three phases but can be applied to the case of four phases. Further, if the waterproof cover of the primary side plug is made of a transparent material, the blowout of the fuse can be visually recognized from the outside. Furthermore, in some cases, the fuse may not be housed in the primary side plug but may be installed in another place.

[Effect of the Invention] As is clear from the above, the plug-in connection portion of the present invention is
For example, with the spread of undergrounding, which is being promoted from the aesthetic point of view of the streets, etc., it can be said that it is optimal as a removable connection part for underground installation type equipment such as transformers installed in narrow handholes. You can

[Brief description of drawings]

FIG. 1 is a front view of an underground installation type apparatus using one embodiment of the present invention, FIG. 2 is a plan view thereof, and FIG. 3A is a front view of a female contactor of one embodiment of the present invention, FIG. 3B is its plan view, third
FIG. C is an enlarged front view showing a part thereof, FIG. 4 is a longitudinal sectional view of a primary side plug of an embodiment of the present invention, and FIG.
It is a longitudinal cross-sectional view of a secondary plug. 9a to 9c ... Bushing, 10 ... Ring spring, 11 ... Finger, 12 ... Female contactor, 13 ... Connecting conductor, 14 ... Extinguishing lid, 15 ... Bolt, 16 ... Pull-out prevention metal fitting , 17 ... wing nut, 18 ... waterproof cover, 19 ... fuse, 19a ... fuse casing, 20 ... compression terminal, 21 ... terminal mounting conductor, 21a ... terminal mounting plate, 22 ... movable rod, 23, 26 ...
… Rubber mold insulation cap, 24, 27, 28 …… Hose band

Claims (1)

[Scope of utility model registration request] 1. A bushing having a female side contact is attached to an inclined upper surface plate of a casing of a device, and an L-shaped plug having a movable rod which cooperates with the female side contact is plug-in connected to the bushing. A plug-in connection part characterized by being formed.