KR20180083660A - joint of mold type busduct - Google Patents

Abstract

Disclosed is a connection part of a mold type busduct. According to the present invention, a molding material forming a molding part of a connection part is well permeated around a fastening bolt to be hardened so as to improve insulation performance, and the overall insulation performance of the connection part can be prevented from decreasing due to the fastening bolt so as to secure the stability and reliability of a product. The connection part of the mold type busduct comprises: a connection kit; a connection part enclosure; and the molding part of the connection part.

Description

[0001] Joint of mold type busduct [0001]

The present invention relates to a connecting portion of a molding type bus duct, and more particularly, to a molding type booth duct capable of increasing insulation performance and securing stability of a product by allowing the molding material forming the connecting portion molding portion to penetrate well around the fastening bolt, Connection.

Generally, cables have been used as a medium for transferring electrical energy. Recently, bus ducts have been used as a substitute for cables. The bus duct is equipped with a bus bar that acts as a conductor core included in the cable and has the advantage of energizing a large amount of current.

Originally, in the power wiring method, the wiring method by the wire cable has been widely used. However, in a wiring method of a high-rise building or a large-scale factory, a wiring method by a bus duct having a bus bar gradually Is increasingly adopted.

These booth ducts and cables have commonality in that they have conductors and insulators, but cables use vinyl or rubber to protect or insulate the conductors, but the bus duct covers the insulator in the bus bar and embeds the bus bar in the metal duct .

Such a booth duct is widely used in a place where a relatively large amount of electric power is used because it is easy to expand and install the booth duct and can be quickly recovered when the abnormality or an accident occurs on the power wiring of the bus bar.

Moreover, since the electricity supply system of the current building requires energy of large and diverse capacity as compared to the past, the use of bus ducts which are safe and have low energy loss is rapidly increasing in accordance with this trend.

For example, booth ducts can be used in a variety of industries such as factories, buildings, apartments, large discount marts, officetels, research complexes, department stores, golf courses, tunnels, semiconductors and LCD factories, chemicals, refineries, steel mills, high-rise buildings, And so on.

The booth bar provided in the booth duct is usually provided inside the duct of a predetermined size in a state isolated from the outside because a large current flows. The booth duct including the booth bar is manufactured as a unit unit having a predetermined length After that, it is connected to the facilities to be installed and the distribution design.

In recent years, the demand for safety has increased, safety standards for distribution design have been strengthened, power distribution systems have been developed to provide stable power supply even in harsh environments such as plants, danger of fire or explosion, humid climate, As the necessity of the facility is increased, it is difficult to satisfy such a requirement with only the above-mentioned conventional bus duct.

An alternative to this is the molding type booth duct which can prepare against water and dust, exhibits durability against erosion and corrosion, and can secure reliability and stability even in emergency situations such as fire or explosion by flammable materials. The scope of application is expanding.

Such a molding type bus duct is manufactured by injecting a mold material in a state in which a plurality of bus bars spaced apart from each other are fixed to a flask and forming a molding portion outside the bus bar. Also, a connecting portion for connecting the molding type bus ducts to each other is also completed by forming a molding portion around the connection kit to which a plurality of bus bars are inserted and connected.

However, in the conventional molding type bus duct connecting portion, the viscosity of the casting material is high when forming the connecting portion molding portion, so that the connecting portion can not penetrate evenly into the connecting kit. Particularly, if the mold material can not be injected into the vicinity of the fastening bolt passing through the connection kit, the overall insulation performance of the connecting part is deteriorated due to the fastening bolt, and the stability of the product is deteriorated.

Accordingly, there is a need to provide a connection part of a molding type bus duct which can solve such a problem and secure the stability of the product by increasing the insulation performance by hardening the casting material forming the connection part molding part to the periphery of the fastening bolt.

The embodiments of the present invention are intended to improve the insulation performance by allowing the casting material forming the connection molding part to penetrate well around the fastening bolt and harden.

Further, it is intended to prevent the deterioration of the overall insulation performance of the connecting portion due to the fastening bolt, and to secure the stability and reliability of the product.

According to an aspect of the present invention, there is provided a connection kit comprising: a connection kit in which a plurality of bus bars of a molding type bus duct are inserted and connected; A connection part enclosure provided outside the bus bar and defining a certain space therein; And a connection molding part integrally formed by injecting a mold material into the connection part enclosure and curing the connection part, wherein the connection kit comprises a plurality of insulation plates arranged at regular intervals to insulate the plurality of bus bars, A coupling bolt provided on at least one side surface of the insulating plate and contacting the bus bar, a fastening bolt penetrating the insulating plate and the current supplying plate to couple the insulating plate and the current supplying plate in a laminated state, And a plurality of insulating bushes stacked and disposed between the adjacent energizing plates and surrounding the tightening bolts.

The insulating bushing may include a casting material injection hole formed to penetrate the insulating bushing so that the casting material forming the connecting part molding part can be injected into the insulating bushing.

The insulating bushing may include an outer insulating bushing disposed at both ends and an inner insulating bushing disposed to be sequentially stacked between the outer insulating bushing disposed at both ends.

The outer insulating bushing and the inner insulating bushing may include a protrusion guide provided on one side and protruding toward the outside, and a guide groove provided on the other side and into which the protrusion guide formed in the other insulating bushing is inserted.

The inner insulating bush may include a protection guide protruding from an adjacent inner insulating bushing and preventing the energizing plate from contacting the fastening bolt.

The embodiments of the present invention can increase the insulation performance by allowing the casting material forming the connection molding part to penetrate well around the fastening bolt and harden.

Further, it is possible to prevent deterioration of the overall insulation performance of the connecting portion due to the fastening bolt, and to ensure the stability and reliability of the product.

1 is a perspective view of a molding type bus duct according to an embodiment of the present invention;
2 is a cross-sectional view of a molding-type booth duct according to an embodiment of the present invention
3 is an exploded perspective view showing a connection structure of a molding type bus duct according to an embodiment of the present invention.
4 is a view showing a state in which a mold material is put in a molding-type bus duct connecting portion according to an embodiment of the present invention
5 is a cross-sectional view showing the structure of the molding-type bus duct connecting portion according to the embodiment of the present invention
6 is a perspective view of the insulated bushing structure of the molded bus-duct connecting portion according to the embodiment of the present invention.
FIG. 7 is a perspective view of an insulated bushing structure of a molding-type bus-duct connecting portion according to an embodiment of the present invention,
8 is a perspective view of a molding type bus duct according to another embodiment of the present invention
9 is a cross-sectional view of a molding-type booth duct according to another embodiment of the present invention
10 is an exploded perspective view showing a connection structure of a molding type bus duct according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like reference numerals designate like elements throughout the specification.

FIG. 1 is a perspective view of a molding type bus duct according to an embodiment of the present invention, FIG. 2 is a sectional view of a molding type bus duct according to an embodiment of the present invention, FIG. 3 is a cross- Type booth duct is shown in the exploded perspective view.

1 to 3, a molding type bus duct 100 according to an embodiment of the present invention includes a plurality of bus bars 120, which are largely formed of conductors, and are stacked in contact with each other; A coating portion (122) surrounding an outer surface of each of the plurality of bus bars (120); An enclosure 110 provided outside the booth bar 120 and forming a certain space inside the booth bar 120; And a molding part 130 integrally formed to surround the outside of the bus bar 120 by being injected into the enclosure 110.

A plurality of booth bars 120 capable of supplying electric power are provided in the molding type booth duct 100. The booth bars 120 may be made of a conductor such as copper or aluminum. When the conductor of the busbar 120 is made of copper, a material having a conductivity of 99% or more is used, and when it is made of aluminum, a conductivity of 61% or more is used.

The configuration of the booth bar 120 can be variously configured according to the installation target of the molding type booth duct 100, the installation environment, the power capacity to be supplied, and the like. For example, as shown in FIG. 2, the bus bar 120 may include four phases of R, S, T, and N. However, the present invention is not limited thereto, and it is possible to have three bus bars 120 of R, S, and T, or three bus bars 120 of R, S, T and two N buses.

Meanwhile, the bus bars 120 of the molding type bus duct 100 according to an embodiment of the present invention may be arranged so as to be stacked in a state of being in contact with each other. That is, as shown in FIG. 2, the plurality of bus bars 120 are arranged so as to be close to each other or attached to each other.

Although the direction in which the busbars 120 are stacked is the vertical direction with reference to FIG. 2, the present invention is not limited thereto, and both vertical and horizontal directions are possible. As described above, in the present embodiment, the bus bars 120 are arranged in a sandwich type so as to be in contact with each other, whereby the overall molding type bus duct 100 can be relatively small in size and compact.

By reducing the total volume and weight of the molding-type booth duct 100, convenience of manufacturing, transportation and installation can be secured.

Instead of arranging the busbars 120 in a sandwich type, a coating part 122 surrounding the outer sides of each of the plurality of busbars 120 may be provided for interphase insulation. The coating part 122 may be made of, for example, epoxy coating, thereby enhancing the insulation performance and securing a heat resistance of about 130 ° C.

Generally, 3.3 kV to 24 kV is classified into a medium voltage (MV), that is, a high voltage, and a voltage lower than that is classified into a low voltage (LV), that is, a low voltage. In the case of a high pressure, it is necessary to maintain the distance between the phases, that is, the interval between the busbars 120 larger than the low pressure, and sufficiently maintain the insulation distance. Accordingly, it is preferable that the arrangement of the sandwich-type busbars 120 of the present embodiment is mainly applied to the LV-grade molding-type busbuste 100.

An enclosure 110 may be provided outside the stacked bus bars 120. The enclosure 110 may be formed by coupling four panels 110a, 110b, 110c, and 110d to form a certain space inside.

Although the bolts 111a, the bolts 111b and the washers 111c are used for the coupling of the enclosure 110 in this embodiment, bolts are fastened to the bolts 111a, but the present invention is not limited thereto and various fastening methods such as rivets and welding may be applied .

A molding part 130 integrally formed to surround the outer side of the stacked busbars 120 may be provided in the space inside the enclosure 110 except for the busbars 120. The molding unit 130 assembles the enclosure 110 and injects epoxy into the enclosure 110 while fixing the laminated busbars 120 at both ends in the longitudinal direction and fixing them in place, .

That is, the molding type bus duct 100 may have a structure in which the outer side of the bus bar 120 is surrounded by the molding part 130 integrally formed and the outer side thereof is surrounded by the enclosure 110. The conventional molding type booth duct is composed of only the bus bar and the molding part without an enclosure. However, the molding type booth duct 100 according to the present embodiment includes not only the bus bar 120 and the molding part 130, (110).

By applying the enclosure 110 to the molding type bus duct 100, the molding part 130 can be prevented from being exposed to the external environment, thereby ensuring durability and maintaining the waterproof, dustproof and system performance even after a long time after installation. By increasing the protection against impact, it is possible to minimize the possibility of failure or breakage.

Furthermore, the enclosure 110 can perform a grounding function, thereby realizing a grounding function which was not possible in a conventional molding-type bus duct, thereby enhancing the stability of the product.

When forming the molding part 130, various kinds of fillers other than the epoxy may be mixed together. The filler may include at least one of a coarse ground sand, a fine ground sand, a fine silica powder, a chalk, and a micro glass ball. In general, the five fillers may be mixed together at an appropriate ratio have.

At this time, the epoxy and filler can be kept in a constant quality by inputting predetermined quantities through automatic weighing. In addition to the epoxy and filler described above, the molding part 130 may be mixed with pigments so as to match the surrounding colors when the power is installed.

The molding type bus duct 100 is manufactured as a unit having a length of 3 m to 3.5 m including the booth bar 120, the molding part 130 and the enclosure 110, It can be implemented as a distribution facility.

1 and 3, the connection unit 200 connects the bus bars 120 of the neighboring molding-type bus-duct 100 through the connection kit 220, and four panels 210a 210b, 210c, 210d are coupled with bolts 211 to provide a connection unit enclosure 210. In addition, the connection can be completed by injecting the epoxy into the inside of the connection part enclosure 210 and hardening it. A detailed description of the structure of the connection unit 200 will be given later.

On the other hand, a heat dissipating member 112 may be provided outside the enclosure 110 along the longitudinal direction. 1 to 3, the heat radiating member 112 is formed at a central portion of the enclosure 110 and includes at least one bar (not shown) extending a predetermined length toward the outside along the longitudinal direction of the enclosure 110 bar shape.

Specifically, in this embodiment, the heat dissipating member 112 is formed in a "C" shape, and a flat middle portion of the heat dissipating member 112 is welded to the enclosure 110 and joined thereto.

As described above, the molding type bus duct 100 according to the present embodiment is provided with the heat dissipating member 112, so that the heat dissipation effect can be enhanced through the simple structure, and the stability of the product can be ensured.

The molded-type bus-duct 100 according to the present invention may further include a plug-in hole 114 formed outside the enclosure 110. A branching device, for example, a PH box (Plug-in Hole box) for power distribution may be coupled to the plug-in hole 114, thereby facilitating design of the power branch, thereby enhancing design flexibility.

The heat dissipating member 112 and the plug-in hole 114 can not be realized in the conventional molding type bus duct. Since the molding type bus duct 100 according to the present embodiment includes the enclosure 110, It is possible to provide the heat dissipating member 112 and the plug-in hole 114.

FIG. 4 is a view illustrating a state in which a mold is inserted into a molding-type bus-duct connecting portion according to an embodiment of the present invention, FIG. 5 is a view illustrating a structure of a molding- And FIG. 6 is a perspective view illustrating an insulated bushing structure of a molded bus-duct connecting portion according to an embodiment of the present invention. 7 is a perspective view of an insulated bushing structure of a molded bus-duct connecting portion according to an embodiment of the present invention.

4 to 7, the molding-type bus duct 100 is manufactured as a unit unit having a predetermined length, and is then connected to the connecting unit 200 to be connected thereto. First, the bus bar 120 of the molding-type bus-duct 100 is inserted and connected by the connection kit 220, and the connection-unit enclosure 210 is provided on the outer side.

As shown in FIG. 4, the mold is injected into the connection housing 210 to be hardened, thereby forming the connection molding part 230.

A concrete configuration of the connection kit 220 will be described with reference to FIG.

A plurality of insulating plates 221 are arranged at regular intervals and an energizing plate 222 is provided on one or both sides of the plurality of insulating plates 221 to make contact with the bus bars 120. Here, the insulating plate 221 may function as a phase-to-phase insulation.

Specifically, it is preferable that the energizing plate 222 is configured to contact both side surfaces of the inserted bus bar 120, which are respectively provided on the facing surfaces of the adjacent insulating plates 221.

In the present embodiment, the bus bar 120 is composed of four phases of R, S, T, and N. Four insulating plates 221 are arranged at regular intervals to form four bus bars 120 And an energizing plate 222 is provided on each of opposite surfaces of the insulating plates 221 adjacent to each other to come in contact with the opposite sides of each of the four bus bars 120. [

That is, a pair of energizing plates 222 disposed so as to face each other between the insulating plates 221 make contact with the bus bar 120 to make an electrical connection, and the insulating plates 221 form respective pairs of energizing And performs an inter-phase insulation between the plates 222.

When the bus bar 120 is composed of three bus bars 120 of R, S and T or five bus bars 120 of R, S, T and two N's combined to form the insulating plate 221, And the energizing plate 222 are formed to correspond to the number of the bus bars 120 to constitute the connection kit 220.

A through hole is formed in the center of the insulating plate 221 and the conductive plate 222 and a fastening bolt 223 is inserted through the through hole to connect the insulating plate 221 and the conductive plate 222.

The fastening bolt 223 is inserted into the through hole and then the nut 224 is fastened to the opposite side and tightened to press and fix the insulating plate 221 and the energizing plate 222 inward. At this time, the bus bar 120 inserted between the insulating plates 221 is also fixed in a compressed state and brought into electrical contact with the energizing plate 222 in a close contact state.

A washer 225 is provided at a portion where the fastening bolt 223 is inserted and the nut 224 at the other side is tightened to increase the fastening force and further the fastening portion 226 is provided on the outer periphery side of the nut 224 So as to prevent the nut 224 from being released from the fastening bolt 223.

Meanwhile, a plurality of insulating bushings 227 and 228 surrounding the tightening bolts 223 may be disposed between the adjacent energizing plates 222 and stacked. The insulating bushings 227 and 228 may be disposed between the energizing plates 222 facing each other when the insulating plate 221 and the energizing plate 222 are stacked as shown in FIG.

The insulating bushings 227 and 228 have through holes 227a and 228b as shown in FIGS. 6 and 7 so that a fastening bolt 223 passing through the insulating plate 221 and the current- And the insulating bushes 227 and 228 are also passed through together.

The insulating bushes 227 and 228 surround the fastening bolts 223 inserted into the through holes 227a and 228b so that the bus bars 120 do not come into contact with the fastening bolts 223 even if the bus bars 120 are stretched by thermal deformation Insulation.

Wherein the insulator bushings 227 and 228 include an inner insulator bushing 228 disposed between the outer insulator bushes 227 disposed at both ends and the outer insulator bushes 227 disposed at both ends, Lt; / RTI >

In the present embodiment, the outer insulating bushes 227 are located at the uppermost and lowermost portions, and four inner insulating bushes 228 are disposed in order so as to be stacked therebetween.

The outer insulating bushing 227 and the inner insulating bushing 228 are provided on one side and include protruding guides 227b and 228b protruding toward the outside and other insulating bushings 227 and 228 provided on the other side, And guide grooves 227e and 228e into which the protrusion guides 227b and 228b formed in the guide grooves 227a and 228b are inserted.

The protruding guides 227b and 228b are inserted into the guide grooves 227e and 228e formed in the adjacent insulator bushings 227 and 228 so that the adjacent insulator bushings 227 and 228 can be coupled to each other.

The outer insulating bushing 227 and the inner insulating bushing 228 thus configured are provided with an outer insulating bushing 227 at the top and bottom and a plurality of inner insulating bushings 228 disposed therebetween, And 228b may be inserted and fitted into the guide grooves 228e and 228e at adjacent positions.

The inner insulation bushing 228 protrudes toward the adjacent inner insulation bushing 228 and has a protection guide 228d for preventing the energizing plate 222 from contacting the tightening bolt 223 can do.

6 and 7, the protection guide 228d protrudes from the upper inner insulation bushing 228 so as to surround half the circumference of the through-hole 228a, (228) so as to surround the other half of the perimeter of the through hole (228a). Therefore, both the protection guides 228d are combined to surround all the peripheries of the through holes 228a, thereby preventing the energizing plate 222 from coming into contact with the fastening bolts 223.

The insulating bushes 227 and 228 are formed to penetrate the insulating bushings 227 and 228 so that the molding material forming the connecting part molding part 230 can be injected into the insulating bushings 227 and 228 And a mold re-injection hole.

6 and 7, the mold material injection holes may be formed by vertically coupling the injection grooves 227c and 228c formed in the insulating bushings 227 and 228 adjacent to each other.

The epoxy which is a mold material is highly viscous when the connection molding part 230 is formed in the connection part 200 as described above so that it can not penetrate evenly into the connection kit 220 and in particular the fastening bolts 223 The mold material can not be injected to the periphery. In this case, the connection molding part 230 is not properly formed around the tightening bolt 223, so that insulation performance around the tightening bolt 223 is deteriorated and the stability of the product is deteriorated.

However, as in the embodiment of the present invention, since the molding material injection holes are provided in the insulating bushes 227 and 228, the epoxy, which is a mold material, can be well penetrated around the fastening bolt 223 to perform molding well, And the stability of the product can be secured.

The epoxy forming the connection part molding part 230 may be composed of a mixture of a base and a curing agent promoting curing. The mixing ratio of the base and the curing agent is preferably 100: 25 to 100: 35.

When the mixing ratio of the curing agent is less than 100: 25, there is a problem that curing of the connecting part molding part 230 takes a long time. When the mixing ratio is more than 100: 35, the curing quality may be lowered. The connection molding part 230 may be formed within the range of 100: 25 to 100: 35.

The epoxy is mixed with a filler, and the mixture ratio of the filler and epoxy is in the range of 70:30 to 80:20. When the mixing ratio of the filler is less than 70: 30, the specific gravity of the epoxy increases and the manufacturing cost increases. If the mixing ratio is larger than 80:20, the curing quality is deteriorated and the mechanical strength and insulation performance of the connection part molding part 230 are reduced. Therefore, it is preferable that the mixing ratio of the filler and epoxy is determined in the range of 70:30 to 80:20.

The filler may include at least one of a coarse ground sand, a fine ground sand, a fine silica powder, a chalk, and a micro glass ball. In general, the five fillers may be mixed together at an appropriate ratio have.

Among the fillers, the coarse ground sand has a PH value of 5.3 to 9.3 and a specific gravity of 0.78 to 1.78, and the water content should be 0.03% or less. In the case of the fine ground sand, the PH value is 4.8 to 8.8 and the specific gravity is 1.09 to 2.09. The water content should be maintained at 0.05% or less.

When the filler comprises fine silica powder, the fine silica powder has a PH value of 5 to 8 and a specific gravity of 1.6 to 3.6. At this time, the Mohs hardness of the fine silica powder should be 7 or more and the water content should be kept at 0.1% or less, and the average particle size is preferably 10um to 15um.

When the filler includes chalk, the pH value of the chalk is in the range of 6.8 to 10.8. At this time, the Mohs hardness of the chalk should be not less than 7, the water content should be kept not more than 0.35%, and the average particle size is preferably from 9 to 13 um. And the whiteness of the chalk, that is, whiteness, is 90% to 94%. The chalk may be replaced by a microdol.

When the filler includes a micro glass ball, the specific gravity of the micro glass ball is in the range of 1.5 to 3.5. Here, the whiteness of the micro glass ball should be maintained at 90% to 94% and the moisture content thereof should be maintained at 0.1% or less.

Filler: Epoxy (76: 24) subject 0.17700 Hardener 0.06300 coarse ground sand 0.23800 fine ground sand 0.25000 find silica powder 0.14000 chalk or microdol 0.04200 마이크로 유리 볼 0.09000 system 1.0000

Table 1 shows an example of practical application mixing ratio of the main constitution of the above-mentioned connection part molding part 230.

The insulation breakdown voltage of the connected connection part 200 formed by forming the connection part molding part 230 is greater than 24 kV / mm to ensure safety. The tensile strength of the connection portion 100 is in the range of 700 kg / m ² to 800 kg / m ² , and is preferably about 760 kg / m ² .

FIG. 8 is a perspective view of a molding type bus duct according to another embodiment of the present invention, FIG. 9 is a sectional view of a molding type bus duct according to another embodiment of the present invention, FIG. 10 is a cross- Type booth duct is shown in the exploded perspective view.

8 to 9, the molding-type bus-duct 100 according to the embodiment of the present invention may include two or more of the plurality of bus bars 120 to form a single line.

1 to 7 illustrate the molding type bus duct 100 and the connection structure thereof when only one stacked bus bar 120 is applied, but the present invention is not limited thereto, and the plurality of stacked bus bars 120 may be provided so as to form one line.

8 to 10 show a case where two sets of stacked bus bars 120 are provided to form one bus duct line. Of course, it is also possible to construct a power line by applying a set of three or more busbars 120 in consideration of supplied power, installation environment, and the like.

Even when two or more sets of stacked busbars 120 are provided, the structure of the connection part 200 is the same as that described in the previous embodiment, and thus a detailed description thereof will be omitted.

According to the connecting portion of the molding type bus duct according to the embodiments of the present invention described above, the molding material forming the connecting portion molding portion can be firmly adhered to the periphery of the fastening bolt so as to increase the insulating performance. As a result, It is possible to prevent the insulation performance from being deteriorated and ensure the stability and reliability of the product.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the appended claims. You can do it. It is therefore to be understood that the modified embodiments are included in the technical scope of the present invention if they basically include elements of the claims of the present invention.

100: Booth duct 110: Enclosure
112: heat radiating member 114: plug-in hole
120: Booth bar 122: Coating part
130: molding part 200: connection part
210: Connection unit enclosure 220: Connection kit
227: outer insulating bushing 228: inner insulating bushing
230: connection molding part

Claims (5)

A connection kit in which a plurality of bus bars of a molding type bus duct are inserted and connected;
A connection part enclosure provided outside the bus bar and defining a certain space therein; And
And a connection part molding part integrally formed by injecting a mold material into the connection part enclosure and curing,
The connection kit includes:
A plurality of insulating plates arranged at predetermined intervals so as to allow a plurality of bus bars to be inserted therebetween so as to be inter-phase-insulated; an energizing plate provided on at least one side of the insulating plate to contact the bus bar; And a plurality of insulating bushes disposed between and adjacent to the adjacent energizing plates and surrounding the fastening bolts, wherein the plurality of insulating bushings are disposed between the insulating plates and the energizing plate, The connection of the type booth duct. The method according to claim 1,
The insulated bushing
And a casting material injection hole formed to penetrate the insulating bushing so that the casting material forming the connecting part molding part can be injected into the insulating bushing. The method according to claim 1,
The insulated bushing
An outer insulating bush disposed at both ends,
And an inner insulating bushing arranged to be sequentially stacked between the outer insulating bushes disposed at both ends of the inner insulating bushing. The method of claim 3,
The outer insulating bushing and the inner insulating bushing,
A protruding guide provided on one side and protruding toward the outside,
And a guide groove provided on the other side and into which a protrusion guide formed in another insulating bush is inserted. The method of claim 3,
The inner insulating bushing
And a protection guide protruding from an adjacent inner insulating bushing side to prevent the energizing plate from contacting the tightening bolt.

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