KR101824338B1 - Underground low voltage distribution box, and installation method of underground low voltage distribution box in ground transformer - Google Patents

Abstract

The present invention relates to a terrestrial transformer fastening-type underground low-voltage distribution box and a method for installing an underground distribution box in a terrestrial transformer. The terrestrial transformer fastening-type underground low-voltage distribution box comprises: a low-voltage bushing terminal (20), one side of which is fastened to a low-voltage bushing (11) outside a terrestrial transformer (10) and the other side is fastened to a bus (51) in an outer box (41) constituting an underground low-voltage distribution box (40); an outer insulation plate (30) which is supported to the low-voltage bushing terminal (20), and performs an insulation function between the outer box (41) and the low-voltage bushing (11); a trunk (54) which is fixed in the outer box (41), and is connected to the bus (51); a branch bus bar (55) which is connected to the trunk (54); and an inner insulation plate (50) which supports an ammeter (80). According to the present invention, a pre-installed terrestrial transformer or a newly installed terrestrial transformer can be integrated with an underground low-voltage distribution box to make the distribution box slim, and it is possible to reduce material costs and installation costs and to reduce costs related to distribution box occupation work.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of installing a low-voltage distribution box in a ground transformer, a low-voltage distribution box and a ground transformer,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground transformer-coupled underground low-voltage distribution box, and more particularly, to a method of installing an underground low-voltage distribution box in a ground-based transformer-coupled underground low-voltage distribution box and a ground-

The low-voltage distribution box is installed in the middle of the low-voltage distribution line between the low-voltage connection line for the ground transformer low-voltage line and the ground connection, and is used for the prevention of the wide-area power interruption which separates the fault section by the branching line or the branching line.

As of December 2015, 43,282 ground transformers were installed and 2,144 low voltage distribution boxes were installed. As shown in FIG. 1, the transformer is operated in multiple protection mode.

In urban areas, a ground transformer (TR) installed on the roadside and a low-voltage distribution box (UDB-Ⅰ) adjacent to the road are supplied to each customer. In the case of a small power consumption consumer area, a power distribution line is constructed and a low voltage distribution box (UDB-Ⅲ) It is supplied to each customer.

As shown in FIG. 2, such a low-voltage distribution box is installed separately from the ground-type transformer, and thus there is a problem that the material cost and installation cost of the low-voltage distribution box are excessively increased. In order to install the low-voltage distribution box, And it is inconvenient to pay the private use fee each year, and there is a problem of over investment in applying multi-protection method to the characteristics of the consumer load.

Patent Document 1: Korean Patent Application No. 0480229 (Apr. 21, 2016)

The object of the present invention is to provide an underground low-voltage distributing box and a ground transformer which can reduce material costs and installation costs and reduce costs related to conventional underground low-voltage distribution box business by integrating the underground low-voltage distribution box into a ground transformer, And a method of installing a low-pressure underground distribution box in the underground.

According to an aspect of the present invention, there is provided a low pressure bushing terminal comprising: a low-pressure bushing terminal having one side thereof fastened to a low-pressure bushing outside a ground-type transformer and another side fastened to a busbar inside an enclosure constituting an underground low- An outer insulating plate supported by the low-pressure bushing terminal and performing an insulating function between the outer case and the low-pressure bushing; A bushing terminal fixed to the inside of the enclosure and connected to the busbar, a branch bus bar connected to the trunk line, and an internal insulation plate supported by the ammeter, wherein the low pressure bushing terminal includes a terminal for fastening with the low pressure bushing; A supporting portion having a predetermined size and perpendicular to the terminal neck and supported by the outer insulating plate; And a connecting portion which is inserted into the insertion hole formed in the outer insulating plate and is perpendicular to the supporting portion and is fastened to the bus bar in the outer case.

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The terminal neck includes an insertion portion into which the low pressure bushing is inserted and whose side is open, and a fastening portion which is fastened to the opened portion and fixes the state where the low pressure bushing is inserted into the insertion portion.

The connecting portion is formed with a fastening hole for fastening a bolt to the terminal of the bus bar.

The trunk and the branch bus bar are divided into phases and arranged from left to right and top to bottom, respectively, and colors are assigned according to the phase characteristics.

A circuit breaker is provided between the trunk line and the branch busbar to cut off current for each phase.

And a current meter is provided in the ammeter by sensing currents of respective phases in the trunk line and the branch bus bar.

A thermometer for measuring the temperature of the insulating oil in the ground transformer is provided.

Pressure bushing terminal, one end of which is fastened to the low pressure bushing outside the ground transformer and the other end is fastened to the trunk inside the enclosure constituting the distributor; An outer insulating plate supported by the low-pressure bushing terminal and performing an insulating function between the outer case and the low-pressure bushing; And an internal insulating plate fixed to the inside of the enclosure and supporting a branch bus bar and an ammeter connected to the trunk line, wherein the low pressure bushing terminal includes: a terminal for fastening with the low pressure bushing; A supporting portion having a predetermined size and perpendicular to the terminal neck and supported by the outer insulating plate; A braided wire connected to one end of a terminal neck penetrating through the support portion and passing through an insertion hole formed in the outer insulating plate; And a connecting portion which forms the end of the weaving line and engages with the trunk in the enclosure.

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The braid lines are colored according to the phase characteristics.

The connecting portion is formed with a fastening hole for fastening a bolt to the terminal of the trunk.

The trunk and the branch bus bar are divided into phases and arranged from left to right and top to bottom, respectively, and colors are assigned according to the phase characteristics.

A circuit breaker is provided between the trunk line and the branch busbar to cut off current for each phase.

And a current meter is provided in the ammeter by sensing currents of respective phases in the trunk line and the branch bus bar.

A thermometer for measuring the temperature of the insulating oil in the ground transformer is provided.

A method of installing a low voltage distribution box in a ground transformer comprises the steps of fastening one side of a low pressure bushing terminal to a low pressure bushing outside the ground transformer and coupling an external insulation plate to the low pressure bushing terminal so that the other side of the low pressure bushing terminal passes through, Pressure bushing terminal to a front surface of the outer insulating plate protruding through the other side of the low-pressure bushing terminal, and fastening the other side of the low-pressure bushing terminal to the busbar or trunk inside the enclosure.

A step of installing an inner insulating plate in which the trunk connected to the busbars, the branch bus bar connected to the trunk, and the ammeter are installed inside the enclosure.

The step of installing the inner insulating plate may further include the step of providing a circuit breaker for interrupting the current for each phase between the trunk line and the branch busbar.

The step of installing the internal insulating plate may further include the step of installing a current measuring device in the ammeter by detecting currents of respective phases in the trunk line and the branch bus bar.

The present invention can integrate a low-voltage distribution box into a ground transformer or a ground transformer newly installed, thereby making it possible to slim the distribution box, reduce the material cost and the installation cost, and reduce the costs associated with the distribution business.

Further, the present invention has the effect of reducing the number of low-voltage circuits by protecting the low-voltage trunk line by utilizing the direct supply customer's accountable branch circuit breaker (MCCB) and utilizing it as the individual protection method.

In addition, the present invention has a built-in current measuring device (PCT), and it is possible to manage the load per circuit breaker and display it on the ammeter so that the handler can check it.

Figure 1 shows the operating scheme of multiple protection schemes.
FIG. 2 is a photograph showing a ground transformer and an underground low voltage distribution box installed separately. FIG.
FIG. 3 is a diagram illustrating an operation scheme of an individual protection method according to the present invention; FIG.
4 is a side cross-sectional view of a ground transformer fastening underground low pressure distribution box according to the present invention.
5 is a front view showing the inside of a ground transformer fastening underground low-voltage distribution box according to the present invention.
6 illustrates one embodiment of a low pressure bushing terminal according to the present invention.
Figure 7 shows a state in which the low pressure bushing terminal of Figure 6 is fastened to the low pressure bushing;
8 shows the connection of the low pressure bushing terminal of FIG. 6 in engagement with the bus bar in the enclosure;
9 is a circuit diagram of a PCT and a bus bar connection according to an embodiment of the present invention.
10 shows another embodiment of a low-pressure bushing terminal according to the present invention.
11 is a view showing an example in which the low-pressure bushing terminals of Fig.
12 is a circuit diagram of a PCT and a bus bar connection according to another embodiment of the present invention.
13 is an internal breakage system diagram according to another embodiment of the present invention.
14 is a front view showing a state in which a cover is installed in an underground low-voltage distribution box according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a schematic diagram of the operation of the individual protection system according to the present invention. FIG. 4 is a side sectional view showing the ground transformer fastening type underground low-voltage distribution box according to the present invention. 6 is a front view showing the inside of a ground transformer fastening underground low voltage distribution box, and FIG. 6 is a view showing an embodiment of a low pressure bushing terminal according to the present invention. FIG. 7 shows a low pressure bushing terminal of FIG. And FIG. 8 is a view showing a state in which the connecting portion of the low-pressure bushing terminal of FIG. 6 is fastened to the bus bar in the enclosure. FIG. 9 is a cross- A PCT and a bus bar connection internal circuit diagram are shown.

As shown in FIG. 3, the ground transformer fastening type underground low voltage distribution box of the present invention has a built-in breaker (MCCB) in an underground low-voltage distribution box fastened to a ground transformer TR and a separate protection scheme .

4, the ground transformer fastening type underground low-voltage distribution box of the present invention can be slimized by dividing the underground low-voltage distribution box 40 into a ground transformer 10 and integrating the underground low-voltage distribution box 40, .

The specific configuration of the ground transformer fastening underground low-voltage distribution box includes a low-pressure bushing terminal 20, an external insulation plate 30, and an internal insulation plate 50, as shown in Figs.

The low-pressure bushing terminal 20 is a connection metal for fastening the ground transformer 10 and the underground low-voltage distribution box 40 to each other.

The low pressure bushing terminal 20 is fastened to the low pressure bushing 11 on one side of the ground transformer 10 and the other side is fastened to the bus bar 51 on the inside of the enclosure 41 constituting the underground low pressure distributing box 40.

Specifically, the low-pressure bushing terminal 20 is fastened to the conventional low-pressure bushing 11 of the ground-surface transformer. The primary side of the ground transformer 10 means the high voltage side and the secondary side is the low voltage side.

6, the low-pressure bushing terminal 20 includes a terminal neck 21, a support portion 25, and a connection portion 27. As shown in Fig.

As shown in Figs. 6 and 7, the terminal neck 21 is a portion to be fastened to the low-pressure bushing 11. The terminal neck 21 has a structure capable of being selectively fastened to a low pressure bushing 11 made of copper. The terminal neck 21 is made of the same material as the low-pressure bushing 11.

The terminal neck 21 has an insertion portion 22 in which a low pressure bushing 11 is inserted and one side of which is opened and a low pressure bushing 11 which is fastened to an open portion of the insertion portion 22, And a fastening portion 23 for fastening the inserted state to the fastening portion 23.

The fastening portion 23 is provided with a bolt hole 23a symmetrically formed in an open portion of one side of the insertion portion 22 and a fastening portion 23a fastened to the bolt hole 23a, And a fixing nut 23c and a fixing bolt 23b for fixing the inserted state of the fixing bolt 11.

The supporting portion 25 is perpendicular to the terminal neck 21 and has a predetermined size and is supported by the outer insulating plate 30. [ The supporting part 25 is formed in the shape of a square plate and one surface is in close contact with the outer insulating plate 30. The support portion 25 is formed with an outer insulating plate 30 and a bolt hole 25a for fixing. The support portion 25 may be made of an insulating material.

The connecting portion 27 is inserted into the insertion hole 31 formed in the outer insulating plate 30 perpendicular to the supporting portion 25 and is fastened to the bus bar 51 in the outer case 41. The connection portion 27 may be formed integrally with the terminal neck 21 through the support portion 25. The connecting portion 27 is made of copper. The connecting portion 27 is formed with a fastening hole 28 for fastening the bolt 52b to the terminal portion 52 of the bus bar 51 to be described later.

The outer insulating plate 30 is supported by the low-pressure bushing terminal 20 and performs an insulating function between the enclosure 41 and the low-pressure bushing 11. The outer insulating plate 30 is formed with an insertion hole 31 into which the connection portion 27 of the low-pressure bushing terminal 20 is inserted. The low pressure bushing terminal 20 is fastened to the bus bar 51 in the enclosure 41 through the insertion hole 31 of the outer insulating plate 30.

The support portion 25 of the low-pressure bushing terminal 20 is connected to the external insulation plate 30 by bolts or the like in a state where the connection portion 27 of the low-pressure bushing terminal 20 is inserted into the insertion hole 31 of the external insulation plate 30 So that it is firmly fixed.

4 and 8, the enclosure 41 is an outer case for receiving and protecting internal components including the main line 54, the branch bus bar 55, the ammeter 80, and the like. (40).

The enclosure 41 is formed in a hexahedron shape in which front and rear surfaces are opened. One side of the rear side of the enclosure 41 is supported by the outer insulating plate 30. The rear side of the enclosure 41 may be fixed to the outer insulating plate 30 by bolts 33 or the like.

Although not shown, the upper portion of the enclosure may further include a sup- port for connecting the upper front supporter of the ground transformer body to the upper portion of the enclosure to reduce the load of the low-pressure bushing depending on the weight of the low- The support is in the shape of a '' '' '' '' '' '' '' '' '' '' '' '' '' 'On one side, there is a recess to hook on the top support of the ground transformer body and a bolt groove on the other side for fastening to the top of the low-

The inner insulating plate 50 is fixed to the inside of the enclosure 41 and has internal parts such as a trunk line 54 connected to the bus bar 51, a branch bus bar 55 connected to the trunk line 54 and an ammeter 80 .

One side of the trunk line 54 is connected to the bus bar 51 and the other side is connected to the branch bus bar 55. The trunk line 54 and the branch bus bar 55 are disposed above the ground transformer rated capacity and disposed on the front surface of the inner insulating plate 50.

The low pressure bushing 11 of the ground transformer 10 is provided with four for four phases R, S, T, N and the low pressure bushing terminal 20 is fastened to the low pressure bushing 11 drawn out from each phase. A bus bar (51) is fastened to each low-pressure bushing terminal (20).

Accordingly, the trunk line 54 and the branch bus bar 55 become four phases of R, S, T, and N, and colors can be given to distinguish each phase.

As shown in FIGS. 5 and 9, the trunk line 54 and the branch bus bar 55 are separated from each other by a phase, and are arranged from left to right and top to bottom, respectively, and colors can be given according to phase characteristics.

For example, R may be red, S may be blue, T may be black, and N may be white.

A breaker (MCCB) for interrupting the current for each phase may be provided between the trunk line 54 and the branch bus bar 55. The breaker (60) is for protecting the trunk (54). The breaker (60) may have two or more cooperating or thermal coin breakers for preventing image defects and for varying the cable rated current.

The branch bus bar 55 has a breaker current capacity or more. The end portion of the branch bus bar 55 may have two bolt holes or a fastening portion so as to be connectable with the copper pipe terminal.

A voltmeter or an ammeter 80 for managing the load of the low-voltage circuit may be provided on the primary side or the secondary side of the circuit breaker 60.

A current measuring device (PCT) 70 is provided on the trunk line 54 and the branch bus bar 55 for detecting the current for each phase and indicating the current on the ammeter 80. The current meter 70 checks the load factor for each breaker 60 and displays it on the ammeter 80.

A thermometer for measuring the temperature of the insulating oil in the ground-top transformer 10 may be provided.

The inside of the enclosure 41 is made of a completely flame-retardant material except for the terminal portion and is insulated. A cover is provided on the front surface of the enclosure 41 and a locking device is provided so that the inside of the enclosure 41 can not be opened except the operator. The cover 90 is for preventing damage due to self-failure and internal icing or humidity. The cover 90 will be described in detail in another embodiment to be described later.

Hereinafter, a process of fastening and integrating the underground low-voltage distribution box to the ground-level transformer using the low-pressure bushing terminal of the embodiment will be described.

First, as shown in Fig. 7, the secondary side low-pressure bushing 11 of the ground transformer 10 and the terminal neck 21 of the low-pressure bushing terminal 20 are fastened.

Pressure bushing 11 of the ground-level transformer 10 is inserted into the insertion portion 22 of the low-pressure bushing terminal 20 and the fixing bolt 23b is inserted into the bolt hole 23a of the fastening portion 23 And a fixing nut 23c is fastened to the end of the fixing bolt 23b passing through the bolt hole 23a to fasten the opening of the insertion part 22 to one side of the side of the insertion part 22, ) Is inserted in a fixed state.

The low voltage bushing 11 of the ground transformer 10 is provided with four terminals for drawing four phases of R, S, T and N so that the terminal neck 21 of the low voltage bushing terminal 20 is fastened to four.

Next, the outer insulating plate 30 is coupled to the low-pressure bushing terminal 20.

Pressure bushing terminal 20 so that the connection portion 27 of the low-pressure bushing terminal 20 is inserted into each insertion hole 31 of the external insulation plate 30, the support portion 25 of the low- The operation of coupling the external insulating plate 30 to the low-pressure bushing terminal 20 is completed when the external insulating plate 25 and the external insulating plate 30 are fixed using bolts or the like.

Next, as shown in Fig. 8, the enclosure 41 is fixed to the front surface of the outer insulating plate 30 using bolts 33 or the like. At this time, the lower surface of the enclosure 41 can be fixed to the ground transformer body using an upper support.

After fixing the enclosure 41 to the outer insulating plate 30, the connecting portion 27 of the low-pressure bushing terminal 20 is connected to the bus bar 51. In this method, the bolt 52b is fastened to the fastening hole 52a of the bus terminal portion 52 and the fastening hole 28 of the connecting portion 27 in a state where the connecting portion 27 and the bus terminal portion 52 are overlapped with each other, 52b, respectively.

The inner insulating plate 50 on which the trunk line 54, the branch bus bar 55, the circuit breaker 60 and the ammeter 80 are disposed is fixed to the inside of the enclosure 41. Next,

When the inner insulating plate 50 is fixed to the inside of the enclosure 41, the respective bus bars 51 are connected to the respective trunks 54. That is, the terminal portion 53 of the bus bar 51 is connected to the terminal portion of the trunk line 54, and the bolt 53b is fastened to the fastening hole of the bus bar terminal portion 53 and the trunk line terminal portion .

The trunk line 54 is connected to each bus bar 51 connected to the low pressure bushing 11 of the ground transformer 10 through the low pressure bushing terminal 20 and the branch bus bar 55 is connected to the trunk line 54 Structure.

As shown in Fig. 9, the trunk line 54 and the branch bus bar 55 are separated from each other by phases and arranged from left to right and from top to bottom, respectively.

Between the trunk line 54 and the branch bus bar 55, a circuit breaker 60 for blocking current is provided for each phase, thereby protecting the trunk line. A current meter 70 may be installed in the branch bus bar 55 to sense currents of the respective phases and currents of respective phases sensed by the current meter 70 may be displayed on the ammeter 80.

As described above, when the operation of installing the inner insulating plate 50 in the enclosure 41 and the operation of connecting the bus bar 51 and the trunk line 54 are completed, a cover serving as a cover is installed on the front surface of the enclosure 41 do. At this time, it is preferable that a lock device or the like is provided on the cover 90 so that the inside of the enclosure 41 can not be opened except the operator.

10 is a view showing another embodiment of the low-pressure bushing terminal according to the present invention, and FIG. 11 is a view showing an example in which the low-pressure bushing terminal of FIG. 10 is divided into phases. FIG. 13 is a schematic diagram of an internal disconnecting line according to another embodiment of the present invention, and FIG. 14 is a cross-sectional view of an underground low voltage distribution box according to another embodiment of the present invention. A front view showing a state in which a cover is installed.

Other embodiments differ in the shape of the low pressure bushing terminal compared to the actual embodiment of the present invention.

10, the low-pressure bushing terminal 120 includes a terminal neck 121, a support portion 125, a braid line 127, and a connection portion 128. As shown in Fig.

The terminal neck 121 is a portion to be fastened to the low pressure bushing 11 of the ground transformer 10. The terminal neck 121 includes an insertion portion 122 having a low pressure bushing 11 inserted therein and a side opening at one side thereof and a low pressure bushing 11 fastened to an open portion of the insertion portion 122, And a fastening part 123 for fastening the inserted state to the fastening part 123.

The fastening portion 123 includes a bolt hole 123a formed symmetrically to the open portion of the insertion portion 122. [ A fixing bolt and a fixing nut are fastened to the bolt hole 123a to fix the state where the low pressure bushing 11 is inserted into the insertion portion 122. [

The supporting part 125 is perpendicular to the terminal neck 121 and has a predetermined size and is supported by the external insulating plate 30. [ The supporting part 125 is formed in the shape of a square plate, and one surface thereof is in close contact with the outer insulating plate 30. The supporting part 125 is formed with a bolt hole 125a for fixing the outer insulating plate 30.

The braided wire 127 is connected to the terminal end 126 of the terminal penetrating through the supporting part 125 and penetrates the insertion hole 31 formed in the outer insulating plate 30. [ As shown in FIG. 11, the braid lines 127 may be different in color by phase. For example, R may be red, S may be blue, T may be black, and N may be white.

The connecting portion 27 forms an end of the knitting line 127 and is fastened to the trunk 54 in the enclosure 41. The end of the terminal neck 126, the wire 127 and the connecting portion 128 passing through the terminal neck 121 and the supporting portion 125 are made of the same material and the outer covering surrounding the supporting portion 125 and the weft wire 127 It becomes an insulating material.

The low voltage bushing terminal 120 is connected to each trunk line 54 by pulling out the braided line 127 to the front surface of the inner insulating plate 50

Specifically, the low-pressure bushing terminal 120 includes a low-pressure bushing terminal 120 having an insertion portion 122 fastened to the low-pressure bushing 11 outside the ground-based transformer 10 and a connection portion 128 connected to the low- And is fastened to the trunk line 54.

Another embodiment differs only in the configuration in which the low-pressure bushing terminal 120 is fastened to the trunk 54 in the enclosure 41. [ Therefore, the detailed description of the configuration that is the same as the one embodiment will be omitted.

12, the low pressure bushing 11 of the ground transformer 10 is connected to each of the trunks 54 in the enclosure 41 through the braiding line 127 of the low pressure bushing terminal 120. [ The trunk line 54 is connected to the branch bus bar 55. The trunk line 54 and the branch bus bar 55 are separated from each other by phases and arranged from left to right and from top to bottom.

Between the trunk line 54 and the branch bus bar 55, a circuit breaker 60 for blocking current is provided for each phase so that the trunk line 54 can be protected. A current meter 70 is installed in the branch bus bar 55 to sense the current of each phase and the current of each phase sensed by the current meter 70 can be displayed on the ammeter 80.

The ammeter 80 can be configured to connect the communication device (IoT) to check the field load capacity in real time.

The above ground transformer fastening type underground low-voltage distribution box is composed of an ammeter indicating the load current per circuit breaker, an on-off display unit for confirming whether or not each breaker is charged, a voltmeter for detecting voltage, an ammeter for sensing current, And a thermometer may be selectively combined.

13, a thermometer TM for measuring the temperature of the insulating oil of the ground-top transformer, a breaker MCCB installed for each phase, an on-off indicator FL for confirming whether each breaker is charged or not, And a current measuring device (PCT) for detecting the current flowing through the wire.

As described above, the integrated ground transformer coupling type underground low-voltage distribution box can be used in various forms according to the construction method of the low-voltage line.

For example, the 630A + 400A structure that can replace the underground low-voltage distribution box separately installed at the present, 250A × 4EA, 250A × 2EA + 250A, which can be used as the customer and the accountable point or division switch of the underground low- 160A, and 250A + 160A + 100A, respectively. In the case of the direct supply system, it is possible to operate 2 ~ 4 depending on the surrounding conditions.

On the other hand, when the operation of installing the inner insulating plate 50 in the enclosure 41 and the operation of connecting the bus bar 51 and the trunk line 54 are completed, A cover 90 serving as a cover is provided. At this time, a lock device or the like is provided on the cover 90 so that the inside of the enclosure 41 can not be opened except the operator.

The cover 90 is provided with a display window.

The display window exposes the current display unit 91, the on-off display unit 93 and the temperature display unit 95 to the outside so that the operator can check the load current, whether or not the breaker is charged, and the temperature of the ground-insulating transformer oil.

The display window may be configured to expose the current display unit 91, the on-off display unit 93, and the temperature display unit 95, respectively, or may be exposed to one display window 91 '.

The above-mentioned ground transformer type underground low-voltage distribution box can reduce the costs related to the distribution business and reduce the material cost and the labor cost, and the current measurement device (PCT)

For example, when installing a ground transformer, there is no need to install a separate low-voltage distribution box, which prevents traffic inconveniences and aesthetic complaints related to private business and low voltage cable. It is possible to prevent damage to the customer.

Best Mode for Carrying Out the Invention The present invention has been described with reference to the drawings and the specification. Although specific terms are used herein, they are used for the purpose of describing the present invention only and are not used to limit the scope of the present invention described in the claims or the claims. Therefore, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: ground transformer 11: low pressure bushing
20: Low pressure bushing terminal 21: Terminal neck
22: insertion part 23: fastening part
23a: Bolt hole 23b: Fixing bolt
23c: Fixing nut 25: Support
27: connecting part 28: fastening hole
30: outer insulating plate 31: insertion hole
40: Low pressure distribution box 41: Enclosure
50: inner insulating plate 51: mother board
52, 53: terminal portion of bus bar 54:
55: branch bus bar 60: breaker (MCCB)
70: current measuring device (PCT) 80: ammeter
90: Cover 91: Current indicator
93: ON / OFF display part 95: Temperature display part
120: Low pressure bushing terminal 121: Terminal neck
122: insertion part 123: fastening part
125: Support part 126: Terminal neck part
127: woven wire 128:

Claims (21)

Pressure bushing terminal, one end of which is fastened to the low-pressure bushing outside the ground transformer and the other end is fastened to a bus bar inside the enclosure constituting the underground low-voltage distribution box;
An outer insulating plate supported by the low-pressure bushing terminal and performing an insulating function between the outer case and the low-pressure bushing;
A main bus connected to the main line, a branch bus bar connected to the main line, and an internal insulating plate supported by the ammeter,
The low-
A terminal neck to be fastened to the low pressure bushing;
A supporting portion having a predetermined size and perpendicular to the terminal neck and supported by the outer insulating plate; And
And a connecting portion inserted in the insertion hole formed in the outer insulating plate and perpendicular to the supporting portion and fastened to the bus bar in the outer case. delete The method according to claim 1,
The terminal neck
An inserting portion having a shape in which the low pressure bushing is inserted and the side work is opened;
And a fastening portion fastened to the opened portion to fix the insertion state of the low pressure bushing into the insertion portion. The method according to claim 1,
Wherein the connecting portion is formed with a fastening hole for fastening a bolt to the terminal of the busbars. The method according to claim 1,
Wherein the trunk and the branch bus bar are separated from each other by a phase and are arranged from left to right and from top to bottom, respectively, and colors are assigned according to the phase characteristics. The method of claim 5,
And a circuit breaker for interrupting a current for each phase is provided between the trunk line and the branch busbar. The method of claim 5,
Wherein the current measuring device is installed on the trunk and the branch bus bar to sense currents of the respective phases and to display the current meter on the ammeter. The method according to claim 1,
And a thermometer for measuring the temperature of the insulation oil in the ground transformer. Pressure bushing terminal, one end of which is fastened to the low pressure bushing outside the ground transformer and the other end is fastened to the trunk inside the enclosure constituting the distributor;
An outer insulating plate supported by the low-pressure bushing terminal and performing an insulating function between the outer case and the low-pressure bushing;
And an inner insulating plate fixed to the inside of the enclosure and supporting a branch bus bar and an ammeter connected to the trunk line,
The low-
A terminal neck to be fastened to the low pressure bushing;
A supporting portion having a predetermined size and perpendicular to the terminal neck and supported by the outer insulating plate;
A braided wire connected to one end of a terminal neck penetrating through the support portion and passing through an insertion hole formed in the outer insulating plate; And
And a connecting portion that forms the end of the wire and is connected to the trunk in the enclosure. delete The method of claim 9,
The terminal neck
Pressure bushing is inserted and the one side is opened;
And a fastening portion that is fastened to the opened portion and fixes the low pressure bushing inserted into the insertion portion. The method of claim 9,
Wherein the braided wire is colored according to the phase characteristics. The method of claim 9,
Wherein the connecting portion is formed with a fastening hole for fastening a bolt with a terminal of the trunk. The method of claim 9,
Wherein the trunk and the branch bus bar are separated from each other by a phase and are arranged from left to right and from top to bottom, respectively, and colors are assigned according to the phase characteristics. The method of claim 9,
And a circuit breaker for interrupting a current for each phase is provided between the trunk line and the branch busbar. The method of claim 9,
Wherein the current measuring device is installed on the trunk and the branch bus bar to sense currents of the respective phases and to display the current meter on the ammeter. The method of claim 9,
And a thermometer for measuring the temperature of the insulation oil in the ground transformer. Tightening one side of the low-pressure bushing terminal to the low-pressure bushing outside the ground-type transformer;
Connecting an external insulating plate to the low-pressure bushing terminal such that the other side of the low-pressure bushing terminal passes through the external insulating plate;
Pressure bushing terminal is protruded through the other side of the low-pressure bushing terminal; And
And inserting the other end of the low-pressure bushing terminal into a bus bar or trunk inside the enclosure. 19. The method of claim 18,
Further comprising the step of installing an inner insulation plate inside the enclosure, the inner insulation plate being supported by a trunk connected to the busbar, a branch bus bar connected to the trunk, and an ammeter. The method of claim 19,
The step of installing the inner insulating plate may include:
Further comprising the step of providing a circuit breaker between the trunk line and the branch busbar to block currents for each phase. The method of claim 19,
The step of installing the inner insulating plate may include:
Further comprising the step of sensing a current for each phase in the trunk line and the branch bus bar and installing a current meter in the ammeter.

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