KR102367796B1 - Structure for Underground Power Line Branch Box of Pelletized Type Large Capacity - Google Patents

Abstract

The present invention combines the main junction box 30 and the prefab junction box 40 by fitting to face each other without using a separate tool, and the interior of the main junction box 30 and the prefab junction box 40 After connecting the first and second busbars 50 and 60 for each phase installed in the Secondary down-wires 12 for each phase are connected to match each 52, and for each phase-by-phase lead-in line 14 for one side connection part 62 of the second busbars 60 for each phase of the prefabricated junction box 40 Since it is a structure that completes the assembly by connecting them to match each other, a separate prefabricated branch box 40 can be assembled and installed in a simple way every time an incoming point is added. It is possible not only to prevent safety accidents such as etc., but also to increase work efficiency at complex entrances, and to improve the aesthetics of the pole 20, where empty overhead lines and a large number of service lines are installed in downtown areas.

Description

Structure for Underground Power Line Branch Box of Pelletized Type Large Capacity

The present invention relates to an assembled large-capacity underground junction box structure, and more particularly, a separate prefabricated junction box can be installed by simply assembling each time a secondary side entry point is added in a large-capacity underground entry junction box installed in a columnar transformer. It relates to an assembled large-capacity underground junction box structure.

In general, in order to supply power, it is always passed through a pole transformer installed on a utility pole, and one to three pole transformers are installed to supply single-phase, single-phase three-wire, and three-phase power as needed.

In particular, as more and more customers are connected with large-capacity underground input from pole transformers due to the increase in distributed power, the number of pole transformer secondary-side entry complexes is increasing.

In addition, in order to expand the processing supply capacity, the connected capacity of the distributed power pole transformer is expected to increase from 300kW to 500kW, which will further increase the number of incoming complexes.

The high-capacity drop-in junction box, which is currently used for maintenance of low-voltage incoming complex areas, has a transformer secondary down-line and drop-in line connected in one area, and each phase is separated by only one bulkhead, so the first line is newly established and an additional lead-in is installed at the existing location. There is a risk of a safety accident due to a short-circuit between phases.

And, as shown in Fig. 1, when connecting a large number of distributed power sources with large-capacity underground inlet in an existing complex location, not only the construction of a 4-wire rack and a standing pipe is required, but there is also concern about the occurrence of misconnection with other incoming lines, and it is difficult to distinguish the incoming lines. The disadvantage is that maintenance is difficult.

In addition, as shown in FIG. 2 , the existing large-capacity pull-in junction box has a disadvantage in that safety accidents such as a short circuit between phases occur due to a narrow working space.

Korea Public Utility Model Publication No. 1992-0007070 (1992.04.22.)

An object of the present invention is to secure a working space for each incoming and outgoing junction by assembling and installing a separate junction box in a simple way every time an incoming point is added in order to prevent safety accidents such as a short circuit between phases due to a narrow working space, which is a disadvantage of the existing large-capacity pull-in junction box. It is to provide an assembly type large-capacity underground junction box structure that can be

Assembled large-capacity underground junction box structure according to an embodiment of the present invention for solving the above technical problem, the main junction box installed on the lower side of the pole transformer, and the main junction box are fitted to correspond to the plug portion of the main junction box in the horizontal direction A prefabricated branch box with concavo-convex parts to be assembled, and a second down-line for each phase A, B, C, and N that are installed horizontally at regular intervals up and down inside the main junction box and are respectively connected to correspond to the secondary down-line for each phase cut from the column-phase transformer The first busbars and the second busbars for each phase are respectively installed horizontally at regular intervals up and down to correspond to the height of the first busbars in the prefabricated branch box and are respectively connected to correspond to the lead-in line for each phase brought in from the outside and phase-by-phase connection brackets for respectively connecting the first busbars and the second busbars by phase through phase-by-phase connection holes formed on side surfaces of the main junction box and the prefabricated branch box.

As another embodiment, the front of the main junction box and the prefabricated branch box of the present invention is characterized in that a transparent window is installed, respectively.

As another embodiment, on the rear surface of the main junction box and the prefabricated junction box of the present invention, a plurality of partition walls are formed horizontally at regular intervals up and down to ensure an insulating distance between the first busbars for each phase and the second busbars for each phase. characterized in that

As another embodiment, it is characterized in that the down-line insertion holes for each phase are formed on one side of the upper surface of the main junction box of the present invention.

As another embodiment, the lower surface of the prefabricated branch box of the present invention is characterized in that the lead-in insertion hole is formed.

As another embodiment, it is characterized in that fuse supports for supporting the electric wire fuses respectively installed on one side of the phase-by-phase lead-in wires are installed on one side of the inner rear surface of the prefab junction box of the present invention, respectively.

As another embodiment, the plugging portion of the present invention is characterized in that it is formed in a convex shape on both sides of the main junction box so as to be fitted and coupled in a vertical direction corresponding to the uneven portions formed on both sides of the prefabricated branch box.

As another embodiment, the concave-convex portion of the present invention is characterized in that a concave shape is formed on one side of the prefabricated branch box, and a convex shape is formed on the other side of the prefabricated branch box.

As another embodiment, the plug and the concave-convex part of the present invention are inserted in a vertical direction to correspond to each other and taper from the top to the bottom so that the main junction box and the prefabricated branch box are coupled while stopping when they reach the same height in the horizontal direction. It is characterized in that each is formed.

As another embodiment, on one central side of the phase-by-phase first busbars and the central one side of the phase-by-phase second busbars of the present invention, the charging parts of the phase-by-phase secondary down-wires and phase-by-phase lead-ins are each removably fastened by a bolt. It is characterized in that each connection part is installed.

As another embodiment, the phase-by-phase connection brackets of the present invention are characterized in that the phase-by-phase first busbars and the phase-by-phase second busbars are fastened by a plurality of bolts.

The present invention combines the main junction box and the prefab junction box by fitting so that the sides face each other without using a separate tool, and the first and second busbars for each phase installed inside the main junction box and the prefabricated junction box are combined with a junction bracket. After connecting each phase by phases, the secondary down-lines for each phase are connected to one side connection part of the phase-specific first busbars of the main junction box to match, and each phase is connected to one side connection part of the phase-specific second busbars of the prefabricated junction box Since it is a structure that completes the assembly by connecting each lead-in so that each lead-in is matched, a separate prefabricated branch box can be assembled and installed in a simple way every time a lead-in point is added. Not only can safety accidents be prevented, but it can also improve work efficiency at complex entrances, and improve the aesthetics of Jeonju, where empty overhead lines and multiple service lines are installed in downtown areas.

1 is a field photo of an existing inlet complex;
2 is a photograph of the exterior and interior of the existing large-capacity inlet junction box installed;
3 is an expected installation view of an assembled large-capacity underground junction box according to the present invention;
4 is a block diagram of the main junction box according to the present invention;
5 is a block diagram of a prefabricated branch box according to the present invention;
6 is a configuration diagram before assembly of the main junction box and the prefabricated junction box of the prefabricated large-capacity underground junction box according to the present invention;
7 is a configuration diagram after assembly of the main junction box and the prefabricated junction box of the prefabricated large-capacity underground junction box according to the present invention.

In order to fully understand the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings 3 to 7 . Embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. Accordingly, the shapes of elements in the drawings may be exaggerated to emphasize a clearer description. It should be noted that the same configuration in each drawing is sometimes illustrated with the same reference numerals. Detailed descriptions of well-known functions and configurations determined to unnecessarily obscure the gist of the present invention will be omitted.

The assembly-type large-capacity underground junction box structure according to an embodiment of the present invention includes the main junction box 30 installed by the wangeum band 22 on the lower side electric pole 20 of the pole transformer 10, and the main junction box The prefabricated branch box 40 in which the concave and convex portions 42 are formed so as to be fitted in correspondence with the plugging portion 32 of the box 30 and assembled in the horizontal direction, and the main junction box 30 are horizontally spaced apart from each other at vertical intervals. The first busbars 50 for each phase respectively installed as a 40), each of the phase-by-phase second busbars installed horizontally at regular intervals up and down to correspond to the height of the first busbars 50 and connected to the respective phase-by-phase incoming lines 14 brought in from the outside ( 60), and the first busbars 50 and the second busbars 60 ) is configured to include phase-by-phase connection brackets 70 that connect each phase to each other.

That is, opening-type transparent windows 36 and 46 are installed on the front surfaces of the main junction box 30 and the prefabricated branch box 40 to easily check the blown fuse and the like.

On the rear surface of the main junction box 30 and the prefabricated branch box 40, the first and second busbars 50 for each phase and the second busbars 60 for each phase are horizontally spaced at regular intervals so as to secure an insulating distance. A plurality of long partition walls 39 and 49 are respectively formed.

On one side of the upper surface of the main junction box 30 , the secondary down-wires 12 for each phase A, B, C, and N are respectively inserted, respectively, with the first busbars 50 for each phase in the main junction box 30 , respectively. Down-line insertion holes 38 are formed for each phase to be connected.

In the prefabricated branch box 40, a lead-in insertion hole 48 is formed so that the phase-by-phase lead-ins 14 are inserted in the center of the lower surface to be respectively connected to the phase-by-phase second busbars 60, and the inner rear side of the Fuse supporters 80 for supporting the wire fuses 16 respectively installed on one side of the lead-in lines 14 for each phase A, B, and C at a predetermined left and right intervals are installed.

The plug portion 32 has a convex shape on both sides of the main junction box 30 so as to be fitted and coupled in a vertical direction with the uneven portions 42 formed on both sides of the prefabricated branch box 40 , respectively. is formed with

The concave-convex portion 42 is concave on one side of the prefabricated branch box 40 , and is formed in a convex shape on the other side of the prefabricated branch box 40 .

At this time, the plug portion 32 and the concave-convex portion 42 are inserted in the vertical direction to correspond to each other so that the main junction box 30 and the prefabricated branch box 40 are coupled while stopping when they reach the same height in the horizontal direction. It is preferable that each is formed to be tapered toward the lower part.

At one central side of the phase-by-phase first busbars 50 and the central one side of the phase-specific second busbars 60, the charging portions of the phase-by-phase secondary down-wires 12 and phase-by-phase lead-ins 14 are connected by bolts, respectively. The phase-by-phase connection parts 52 and 62 are respectively installed so as to be detachably fastened.

The phase-by-phase connection brackets 70 are fastened to connect the phase-by-phase first busbars 50 and the second busbars 60 by a plurality of bolts, or when not in use, the phase-by-phase first busbars 50 or second It is configured to be stored by being fastened to any one of the two bus bars 60 .

In order to assemble the assembled large-capacity underground junction box of the present invention configured as described above, first, the prefabricated junction box ( 40) by aligning the concave-convex part 42 from the upper part and pushing it downward.

Then, by opening the transparent window 46 of the prefabricated junction box 40, each phase-by-phase lead-in line using a bolt for each connection part 62 installed on the phase-by-phase second busbars 60 installed inside the prefabricated junction box 40 A plurality of fuse supports ( 80), respectively.

Next, after loosening the bolts to separate the phase-by-phase connection brackets 70 provided for each phase-specific first busbar 50 installed inside the main junction box 30, the phase-specific connection brackets 70 are connected to the main junction box. After passing through the phase-by-phase connection holes 34 and 44 formed on the side of the prefabricated branch box 40 and the end of the phase-by-phase second busbars 60 of the prefabricated branch box 40, the phase-by-phase connection bracket One end of the (70) is superimposed and fastened with a separate bolt, and the other end of the phase-by-phase connection brackets (70) is overlapped with the ends of the phase-by-phase first busbars (50) of the main junction box (30) Connect the circuits of each phase and neutral wire by fastening them with other bolts.

Next, after inserting the A-phase among the secondary down-wires 12 of the pole-phase transformer 10 into one of a plurality of down-wire insertion holes formed on the upper surface of the main junction box 30, the upper part of the main junction box 30 Fasten with bolts to the connection part 52 of the first A-phase bus bar 50 installed, and then repeat the same as the A-phase in the sequence of B, C, and N phases among the secondary down-wires 12 of the pole-phase transformer 10 Complete the connection work by connecting the circuit by working.

In this way, the assembled large-capacity underground junction box of the present invention combines the main junction box 30 and the prefab junction box 40 by fitting so that the sides face each other without using a separate tool, and the main junction box ( 30) and the first and second busbars 50 and 60 for each phase installed in the interior of the prefabricated junction box 40 are respectively connected to each phase by connection brackets 70, and then the main junction box 30 is Secondary down-wires 12 for each phase are connected to one side connection part 52 of the first busbars 50 for each phase to be matched, respectively, and one side connection part of the second busbars 60 for each phase of the prefabricated branch box 40 Since the assembly is completed by connecting the lead-in lines 14 for each phase to match each 62, it is possible to assemble and install a separate prefabricated branch box 40 in a simple way every time a lead-in point is added. Since space and insulation distance can be secured, safety accidents such as short circuit between phases can be prevented, and work efficiency can be improved at complex entry points, and the aesthetics of the electric pole (20) installed with empty overhead lines and multiple service wires in downtown areas can be improved. There are advantages that can be

In addition, since the opening type transparent windows 36 and 46 are installed in the main junction box 30 and the prefab junction box 40, respectively, the melting of the electric wire fuse 16 installed in the prefab junction box 40, etc. It has the advantage of being easy to check.

On the other hand, the present invention is not limited to the above-described embodiments, but can be implemented with modifications and variations without departing from the gist of the present invention, and the technical idea to which such modifications and variations are applied also falls within the scope of the following claims. have to see

10: pole transformer 12: secondary down-line for each phase
14: lead-in line by phase 16: electric wire fuse
20: Jeonju 22: Wanggeum band
30: main junction box 32: plug part
34: connection hole for each phase 36: transparent window
38: in-line insertion hole by phase 39: bulkhead
40: prefabricated branch box 42: uneven part
44: connection hole for each phase 46: transparent window
48: in-line insertion hole by phase 49: bulkhead
50: first bus bar for each phase 52: connection part for each phase
60: second bus bar for each phase 62: connection part for each phase
70: connection bracket for each phase 80: fuse support

Claims (11)

A main junction box 30 installed on the lower side of the pole transformer 10, and
The prefabricated branch box 40 in which the concave-convex portion 42 is formed so as to be inserted corresponding to the plugging portion 32 of the main junction box 30 and assembled in the horizontal direction;
The main junction box 30 is installed horizontally at regular intervals up and down to correspond to the secondary down-wires 12 for each A, B, C, and N phases cut from the pole-phase transformer 10, respectively. With the first busbars 50 by phase,
With respect to the inside of the prefabricated junction box 40, each of the phases is installed horizontally with a predetermined distance up and down to correspond to the height of the first busbars 50, and each phase is connected to correspond to the lead-in line 14 for each phase drawn in from the outside. The second busbars 60 and
The first busbars 50 and the second busbars 60 are respectively phase-by-phase through connection holes 34 and 44 for each phase formed in the side surfaces of the main junction box 30 and the prefabricated branch box 40 . Prefabricated large-capacity underground junction box structure, characterized in that it includes connecting brackets (70) for each phase to be connected. The method according to claim 1,
The main junction box 30 and the front of the prefabricated junction box 40 are prefabricated large-capacity underground junction box structure, characterized in that transparent windows 36 and 46 are installed, respectively. The method according to claim 1,
On the rear surface of the main junction box 30 and the prefabricated branch box 40, the first busbars 50 for each phase and the second busbars 60 for each phase are horizontally spaced at regular intervals up and down to ensure an insulating distance. A plurality of bulkheads (39, 49) are prefabricated large-capacity underground junction box structure, characterized in that each formed. The method according to claim 1,
An assembled large-capacity underground junction box structure, characterized in that the down-line insertion holes 38 are formed on one side of the upper surface of the main junction box (30). The method according to claim 1,
The prefabricated large-capacity underground junction box structure, characterized in that the lead-in line insertion hole (48) is formed on the lower surface of the prefabricated junction box (40). The method according to claim 1,
On one side of the inner rear side of the prefab junction box 40, a prefabricated large-capacity underground junction box, characterized in that fuse supports 80 for supporting the electric wire fuses 16 respectively installed on one side of the phase-by-phase lead-in lines 14, respectively, are installed. struct. The method according to claim 1,
The plug portion 32 has a convex shape on both sides of the main junction box 30 so as to be fitted and coupled in a vertical direction with the uneven portions 42 formed on both sides of the prefabricated branch box 40 , respectively. Prefabricated large-capacity underground junction box structure, characterized in that formed with. 8. The method of claim 7,
The concave-convex portion 42 is formed in a concave shape on one side of the prefabricated branch box 40, and is formed in a convex shape on the other side of the prefabricated branch box 40. ship structure. 9. The method of claim 8,
The plug portion 32 and the concave-convex portion 42 are inserted in the vertical direction to correspond to each other so that the main junction box 30 and the prefab junction box 40 are coupled while stopping when they reach the same height in the horizontal direction. Prefabricated large-capacity underground junction box structure, characterized in that each is tapered toward the bottom of the. The method according to claim 1,
At one central side of the phase-by-phase first busbars 50 and the central one side of the phase-specific second busbars 60, the charging portions of the phase-by-phase secondary down-wires 12 and phase-by-phase lead-ins 14 are connected by bolts, respectively. Assembled high-capacity underground junction box structure, characterized in that the phase-by-phase connection parts 52 and 62 are respectively installed so as to be detachably fastened. The method according to claim 1,
The phase-by-phase connection bracket (70) is an assembled large-capacity underground junction box structure, characterized in that the phase-by-phase first busbars (50) and the phase-specific second busbars (60) are fastened by a plurality of bolts.

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