KR20190063531A - Busbar and busduct having the same - Google Patents

Abstract

The present invention relates to a bus bar capable of minimizing conductor usage in consideration of a skin effect and a proximity effect of the conductor when supplying power, and a bus duct having the same. The bus duct comprises: a plurality of bus bars having a plurality of conductors and a molding unit surrounding the conductor; and a duct in which the plurality of bus bars are spaced apart and accommodated.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a bus bar and a bus duct having the same,

The present invention relates to a booth bar and a booth duct having the booth bar. More particularly, the present invention relates to a bus bar which comprises a multi-layer conductor for each phase power supply, minimizes the amount of conductor used in consideration of the skin effect and the proximity effect of the conductor at the time of power supply, This is about a booth duct.

Generally, a cable is used as a medium for transferring electrical energy. Recently, a bus duct is widely used as a substitute for a cable. 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.

In the case of high-rise buildings or large-scale factories, wiring is increasingly adopted by a bus duct having a bus bar.

These booth ducts and cables have a common point in that they have conductors and insulators, but cables are provided with layers of oil-immersion or polymeric material around the conductors to protect or insulate the conductors, and the bus ducts are molded with insulating materials having a high heat- Alternatively, separate booth bars may be spaced apart to accommodate booth bars in metal ducts to increase insulation and heat dissipation.

This booth duct is easy to install, enlarge, and install on complicated wiring paths, and can be quickly recovered because it is easy to handle when there is an abnormality or an accident on the power wiring of the bus bar, The use of booth ducts that are safe and have little energy loss is rapidly increasing in line 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.

Since a large current flows through the bus bar provided in the bus duct, the bus bar is provided inside the duct of a predetermined size and isolated from the outside. The bus duct including the bus bar is manufactured as a unit having a predetermined length The connection is made according to the facilities to be installed and the distribution design.

These booth ducts usually constitute more than three phases, and each phase power can be supplied through the busbar. Each of the respective booth bars can be received in an insulated state spaced apart within the duct.

In order to insulate the booth bars of each phase in the booth duct, a method of separating the booth bars of the boiler body from each other or using the air insulation system or molding each booth bar with epoxy or the like may be used. However, The latter method can be used.

Also, since the distance between the phases needs to be increased as the voltage of the power supplied through the bus duct increases, the spacing distance may be increased depending on the voltage. Therefore, the size of the bus duct may be determined depending on the voltage of the supplied power.

Furthermore, when the capacity of the power supplied through the bus duct increases, the method of increasing the size or cross-sectional area of one conductor is not preferable due to the influence of the skin effect and the like. Therefore, A method of configuring as many as possible can be used.

In this case, the cross sectional area of the booth bar of each phase should be determined so as to satisfy the required heat generation amount of the bus bar conductor required according to the magnitude of the voltage or current of the electric power supplied through the bus duct. For example, according to the IEC60694 standard regarding the MV class bus duct system, it is required that the maximum temperature rise width at the surface of the bus bar conductor constituting the bus duct using the A class insulator is 65K or less, The temperature of each conductor must be maintained at about 105 degrees Celsius or less so as not to be damaged by the heat generation of the conductor.

However, even when a plurality of conductors constituting the bus bar are formed, the permissible power amount is not directly proportional to the increase in the total cross-sectional area of the conductor due to the proximity effect. Therefore, And a design that minimizes the amount of wasted conductors in consideration of the proximity effect is required.

The present invention provides a booth bar for minimizing the amount of a conductor used in consideration of the skin effect and the proximity effect of a conductor at the time of power supply, and a booth duct having the booth bar for providing electric power To solve the problem.

According to an aspect of the present invention, there is provided a display device comprising: a plurality of busbars including a plurality of conductors and a molding portion surrounding the conductors; And a duct in which the plurality of busbars are spaced apart from each other, wherein the conductors of the busbars are provided in three or more stages, and the conductors except for the outermost conductor are provided with a discontinuous portion in a cross section .

In this case, the conductor constituting the bus bar may have a flat cross-sectional shape larger than the thickness, and may be arranged in parallel and spaced apart in the molding part constituting the bus bar.

Also, the bus bar may be provided with three conductors, and the discontinuous portion may be formed by dividing the center conductor into two parts.

Here, the widths of the divided conductors may be the same.

The positions of both ends in the width direction of the stacked conductors can be arranged in a straight line.

The ratio of the discontinuous portion of the conductor provided with the discontinuous portion may be determined so as to be within the limited heating value of the conductor constituting the bus bar when the bus bar is energized.

In this case, the thickness of the conductor constituting the bus bar and the upper limit value of the discontinuous portion ratio may be proportional.

The removal ratio of the intermediate conductors is y (= 8.2x-90) percent (%) in the range of 13mm (mm) to 20mm (mm) ≪ / RTI >

Further, in order to solve the above-described problems, the present invention provides a semiconductor device comprising: a plate-shaped aluminum, aluminum alloy, copper or copper alloy conductor having N lengths (N is an integer of 3 or more) And at least one conductor among the conductors other than the two conductors disposed at the outermost one of the conductors is divided in the width direction so as to form a plurality of conductors, Can be provided.

According to the bus duct according to the present invention, the booth bar for each phase power supply includes the multi-layer conductor, the weight of the product is reduced by minimizing the amount of conductor used in consideration of the skin effect and the proximity effect of the conductor at the time of power supply Waste of resources can be prevented.

1 shows a perspective view of a booth duct constituting an embodiment of the present invention.
FIG. 2 is an exploded perspective view showing a state in which ducts of a booth duct constituting an embodiment of the present invention are separated.
3 is a perspective view showing the configuration of a molding part, a molding supporting part, and a base frame of a bus duct constituting an embodiment of the present invention.
FIG. 4 is a side view showing a configuration of a molding part, a molding supporting part, and a base frame of a booth duct constituting an embodiment of the present invention.
5 shows a cross-sectional view of the booth duct shown in Fig.
6 is a plan view of a bus duct system in a state where a pair of bus ducts of the present invention are connected.
FIGS. 7 and 8 are graphs showing current densities (current per unit area (current per unit area) of a 4,000 ampere (A) vessel of a bus-duct having three bus-bars with three conductors each having a thickness of 15 millimeters and a width of 200 millimeters Density) distribution.
Fig. 9 shows a graph of the calorific value (heat generation loss) results of the bus bars according to the ratio of the discontinuities shown in Fig.
10 and 11 illustrate the results of the current density distribution of the conductor loss analysis in the 4000 amperes (A) of a bus-duct having three bus-bars with three conductors each having a thickness of 20 millimeters and a width of 200 millimeters Respectively.
12 shows a graph of the calorific value (heat generation loss) results of the bus bars according to the ratio of the discontinuities of the intermediate conductors shown in Fig.
13 shows the relationship between the thickness of the conductor constituting the bus bar and the maximum removable ratio of the intermediate conductor.

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 unit booth duct 100 constituting an embodiment of the present invention. FIG. 2 is an exploded perspective view showing a state in which a duct of a unit booth duct 100, which constitutes an embodiment of the present invention, And FIG. 3 is a perspective view showing a molding part, a molding supporting part, and a base frame of the unit bus duct 100 constituting an embodiment of the present invention. FIG. 4 is a side view showing a molding part, a molding supporting part, and a base frame of the unit booth duct 100 constituting an embodiment of the present invention, FIG. 5 is a sectional view of the booth duct shown in FIG. 1, 6 is a plan view of a bus duct system in a state where a pair of bus ducts of the present invention are connected.

1 to 6, a bus duct 100 constituting an embodiment of the present invention includes a plurality of bus bars 20 having a plurality of conductors 21 and a molding part 23 surrounding the conductors, ; And a duct (60) in which the plurality of bus bars (20) are spaced apart and accommodated. The conductor constituting the bus bar of each phase of the bus bar (20) comprises three or more stages, The conductors except for the outermost conductor among the plurality of conductors 21 constituting the conductor 21 may be provided with a discontinuous portion in a cross section.

When a bus duct having a large power transmission capacity is constituted, if a conductor constituting each of the bus bars of each phase is constituted by a single rectangular conductor having a large cross-sectional area, the conductor width is too large to manufacture and increase the molding cost and durability The booth duct 100 according to the present invention can reduce the influence of the skin effect when dividing the conductors constituting the booth bars of the respective phases into a plurality of pieces. Therefore, the conductors constituting the booth bars of the respective phases are divided into a plurality of .

1 and 2, the booth duct 100 of the present invention may have a structure in which a plurality of booth bars 20 are arranged in parallel, and the duct 60 surrounds the exterior thereof.

Each of the bus bars 20 on each of the phases includes a plurality of flat conductors 21 and the molding portions 23 are wrapped around the conductors 21 constituting the bus bars 20 on the respective phases, The booth bars 20 on each of the phases are spaced apart from each other by a predetermined distance to be accommodated in the duct 60.

1 and 2, the duct 60 includes an upper panel 62 provided at an upper portion thereof, a lower panel 64 provided at a lower portion thereof, and a plurality of side panels 66 provided at a side surface thereof Thereby forming a constant internal space.

The upper panel 62, the lower panel 64, and the side panel 66 may be coupled by various methods such as bolting, riveting, bonding or welding.

The duct (60) may have at least one vent hole (69) communicating with the outside air. As shown in FIGS. 1 and 2, a plurality of vent holes 69 are formed in the side panels 66 constituting the duct 60, respectively. In this case, the vent hole formed in the side panel 66 may be formed in the form of a ventilation hole inclined downward so that rainwater or the like hardly penetrates in the case of rain (69).

A vent hole (69) is formed in the duct (60) to allow the outside air to flow in and the moist air to be discharged, thereby preventing or alleviating the condensation inside the duct (60). In addition, by the method of forming the vent hole 69, it is possible to prevent the condensation inside the duct and also to dissipate the heat generated from the conductor 21 to the outside, so that the stability and reliability of the product can be secured have.

The booth bar may be configured such that the molding part 23 is individually wrapped around the booth bars 20 as shown in FIGS. 1 to 3. The molding part 23 can be formed by disposing a conductor 21 in a flask (not shown) and then injecting an insulating resin for casting to cure it. The insulating resin for a mold may be epoxy, for example.

The present invention can be configured to include a plurality of conductors 21 on each of the bus bars 20 on the respective phases for the purpose of increasing the energizing capacity. The method of providing a plurality of conductors in the molding part 23 may be a method of forming the molding part by epoxy molding or the like while fixing each conductor in parallel and spaced apart from each other.

As shown in FIG. 1 and the like, the booth bars 20 constituting the booth duct according to the present invention are provided such that the conductors are separated from each other by three stages, . The reason why the center conductor is divided into two parts is to reduce the amount of conductor used for the same power transmission capacity, in order to minimize the use of the metal conductor in consideration of the skin effect and the proximity effect. I will postpone the specifics of this.

The molding part 23 and the molding support part 40 to be described later can be integrally formed by injecting the insulating resin for casting into the flask.

The molding part 23 performs both the protection and the insulation of the conductor 21, thereby enhancing the stability of the power supply, and basically exhibiting the waterproof and dustproof performance.

The molding part 23 and the molding support part 40 to be described later are integrally formed by injecting an insulating resin for a mold into a single flask. An epoxy resin, for example, can be applied as the insulating resin for the mold.

The epoxy included in the molding part 23 may be composed of a mixture of a base and a curing agent to promote curing. The mixing ratio of the base and the curing agent may be 100: 25 to 100: 35.

If the mixing ratio of the curing agent is less than 100: 25, the curing of the molding part 23 takes a long time. When the mixing ratio of the curing agent is more than 100: 35, the curing quality may be lowered. The molding portion 23 is formed within the range of 100: 25 to 100: 35.

At this time, the dielectric breakdown voltage of the molding part 23 is greater than 24 kV / mm to ensure safety. The tensile strength of the molding part 23 is in the range of 25 N / mm 2 to 35 N / mm 2, and it is usually preferable that the molding part 23 is composed of about 30 N / mm 2.

When forming the molding part 23, 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.

Meanwhile, the mixing ratio of the filler and epoxy contained in the molding part 23 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 molding part 23 decrease. Therefore, it is preferable that the mixing ratio of the filler and epoxy is determined in the range of 70:30 to 80:20.

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 is an example of actual application mixing ratio of the main constitution of the molding part 23 described above. Of course, the ratio of the filler to the epoxy is not limited to the above-mentioned 76:24, but can be applied, for example, to 75:25. That is, it is possible to carry out the modification within the range of 70:30 to 80:20 as described above.

In addition to the epoxy and filler mentioned above, the molding part 23 may be mixed with pigments so as to match the surrounding color during installation.

The booth duct 100 is manufactured as a unit having a maximum length of 3.5 m including the bus bar 20 and the duct 60 and connected to the distribution facility through a connection unit Can be implemented.

The booth duct according to the present invention shown in FIGS. 1 to 3 is constructed of R, S, and T 3 but is not limited thereto. Specifically, the configuration of the bus bar 20 may be variously configured according to the installation target of the bus duct 100, the installation environment, the power capacity to be supplied, and the like.

A plurality of bus bars 20 capable of supplying electric power are provided in the bus duct 100. The conductor 21 constituting the bus bar 20 is made of a metal such as copper, copper alloy, aluminum or aluminum alloy Lt; / RTI > When the conductor of the conductor 21 is made of copper or a copper alloy, a material having a conductivity of 99% or more is used. When the conductor is made of aluminum or an aluminum alloy, a conductivity of 61% or more can be used.

Copper has a disadvantage that its rigidity is excellent and its conductivity is good, but its price is higher than that of aluminum.

In general, a booth duct of an air-insulating type is formed of a booth bar which is formed by covering a heat shrinkable tube with a naked body, and the booth bar is sufficiently separated from the inside of the duct (60).

Particularly, in the case of a booth duct constituted by a booth bar which is formed by covering a body with a heat-shrinkable tube, a deformation of a conductor due to a problem of deformation of a conductor due to an accident current or a deformation of a conductor by expansion and contraction of a conductor Since the conductor itself has to be rigid in order to prevent it, a copper or copper alloy conductor is mainly used. However, since the bus bar constituting the bus duct 100 of the present invention is provided with the molding portion 23 outside the conductor, deformation of the conductor due to the short-circuit fault current can be prevented or alleviated, The rigidity of the conductor constituting the conductor 21 is reinforced by the stiffness reinforcing effect by the own stiffness, and the above-mentioned problem can be minimized. Therefore, the conductor of the unit bus duct 100 of the present invention can be sufficiently used for a conductor made of aluminum or aluminum alloy which is inexpensive.

Of course, the bus bar conductor of the bus duct of the present invention, which combines the advantages of the air insulation method and the molding method, may be made of aluminum or an aluminum alloy material, but it may be made of a copper material of good rigidity and electrical conductivity. The required cross-sectional area of the conductor can be further reduced.

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 high pressure, it is necessary to maintain the insulation distance sufficiently by making the interval between the phases 21, that is, the distance between the conductors 21 larger than the low pressure.

Therefore, the booth duct 100 of the present invention has a structure in which the outer side of each conductor 21 is surrounded by a molding part 23 integrally formed by a mold, and as shown in FIGS. 1 to 3, (23) are spaced apart from each other by a predetermined distance.

At least one molding supporting part 40 formed integrally with the molding part 23 and supporting the molding part 23 may be provided at the lower part of the molding part 23. The molding support part 40 may have a shape in which a part of the molding part 23 is extended downward by a certain length.

The molding support part 40 is integrally formed when the molding part 23 is formed so as to fix the booth bar on each of the upper and lower surface panels so that at least one molding supporting part supporting the molding part is formed in one molding part 23 A plurality of spaced apart portions may be provided.

4, the molding support portion 40 of the booth bar of the booth duct 100 of the present invention is formed in one molding portion 23 along the longitudinal direction thereof. However, the present invention is not limited thereto, The number of the molding supporting portions 40 can be increased or decreased according to the length of the molding portion 23, installation environment, and the like.

The molding support part 40 may be integrally formed with the molding part 23. [ The shape of the molding support part 40 may be also applied to the mold frame for injecting the molding part 23 so that the molding support part 40 as well as the molding part 23 may be formed together. Therefore, when the insulating resin for casting is injected after the conductor 21 is disposed in the flask, the molding part 23 and the molding supporting part 40 can be hardened together and formed integrally.

A plurality of base frames 50 for mounting the molding support part 40 on the lower panel side may be provided under the molding support part 40 while crossing the plurality of molding parts 23.

The base frame 50 includes a vertical main bar 52 extending across the plurality of molding parts 23 and extending in the horizontal direction at an upper end of the main bar 52, And a lower bending plate 56 bent from the lower portion of the main bar 52 and extending in the horizontal direction and fastened to the lower panel 64. [ have.

The number of the base frames 50 corresponding to the number of the molding supporting portions 40 formed in one molding portion 23 can support the molding supporting portion 40.

In the present embodiment, the base frame 50 is configured such that the main bar 52, the upper bent plate 54 and the lower bent plate 56 are formed in a 'C' shape, but not limited thereto, 40 and the lower panel 64. The upper and lower panels 40, For example, the base frame 50 may have a shape such as 'E' to support the base frame 50.

3 and 4, the upper and lower bent plates 54 and 56 extend in different directions with respect to a central portion of the molding part 23, Respectively.

4, the left two base frames 50 are arranged so that the upper bent plate 54 and the lower bent plate 56 extend toward the left, and the two right base frames 50 The upper bending plate 54 and the lower bending plate 56 are disposed so as to extend toward the right side.

The base frame 50 may alternatively be arranged so that the adjacent base frames 50 extend in different directions.

6 shows a connection part 200 to which a pair of bus ducts constituting a booth duct system according to the present invention are connected. The method of interconnecting the bus ducts of the present invention uses a method of connecting bus ducts of a general air-insulating type, but a method of molding the connection portions with epoxy or the like can also be used.

6, when the two bus ducts 100a and 100b are connected, the length of the side panel 66 is longer than that of the upper panel 62 or the lower panel 64, and specifically, When the position of the end of the booth bar and the position of the end of the side panel coincide with each other, the booth bars of the respective booth ducts 100a and 100b and the end portions of the side panels face each other, The connecting portion 200 can be constituted by being fastened through the fastening member (b) in a state where the four connecting conductors 25 for connecting the conductors are stacked and arranged. In this case, the side panels 66a and 66b may also be connected by fastening members such as bolts.

Since the length of the side panel 66 is longer than that of the upper panel 62 or the lower panel 64, the side panels 66a and 66b are also fastened and connected by fastening members such as bolts, Since the upper and lower regions of the connection portion 200 are open in a state where the bus bars 21a and 21b of the respective phases are connected via the connection conductor 25, It is possible to complete the connection of the bus duct by shielding.

The bus duct connecting method shown in Fig. 6 is only one example, and various methods other than the method using the connecting conductor 25 can be used as a method of connecting bus bars or panels on each of the phases.

Since the connecting conductor 25 is connected to the side surface of the conductor in a state where the conductor of the conductor 21 is in contact with the connecting portion 200, the sectional area of the conductor is increased at the connecting portion, Even if the molding part is not formed in the conductor, the heat generation may not be a significant problem as compared with the area where the molding part is provided.

The area where the conductors are connected through the connecting conductor 25 can be configured to be enclosed by a separate boot (insulator), a cap member, or the like for the purpose of protecting the conductor.

FIGS. 7 and 8 are graphs showing current densities (current per unit area (current per unit area) of a 4,000 ampere (A) vessel of a bus-duct having three bus-bars with three conductors each having a thickness of 15 millimeters and a width of 200 millimeters Density) distribution.

Specifically, FIG. 7 shows a comparative example in which a discontinuous portion is not provided in a conductor constituting each busbar, and FIG. 8 shows an embodiment including a discontinuous portion in the intermediate conductor constituting each busbar.

The booth duct according to the present invention has a booth bar of three or more phases, each booth bar has a plurality of conductors 21, and the conductor except for the outermost conductor is provided with a discontinuous portion 21c in cross section do. When the conductors constituting the bus bars of the respective phases are constituted by three or more stages, the conductors other than the outermost conductor, for example, the second conductors 21b disposed at the center of the three-stage first to third conductors 21a, The center portion in the width direction does not make a large contribution to the energization due to the proximity effect, so that the discontinuous portion 21c is formed in the conductor within the range where the molding portion is not deteriorated or damaged by heat generation, so that the amount of the conductor used can be minimized. A method of determining the size or the ratio of the discontinuous portion 21c will be described in detail later.

That is, the booth bar according to the present invention comprises a plate-shaped aluminum, aluminum alloy, copper or copper alloy conductor having N lengths (N is an integer of 3 or more) longer than the width; And at least one conductor among the conductors other than the two conductors disposed at the outermost one of the conductors is divided in the width direction so that the conductor usage amount Can be minimized. Therefore, even when each bus bar is composed of conductors of three or more phases, the amount of conductor used can be minimized by forming a discontinuous portion in the conductor except for the outermost conductor.

As a specific example, as in the embodiment described with reference to FIGS. 1 to 6, each of the bus bars shown in FIG. 8 is provided with three conductors spaced apart from each other, and the center conductor may be divided into two parts .

The first conductor to the third conductor constituting each of the first bus bar to the third bus bar are formed such that the second conductor 21b excluding the first conductor and the third conductor, And the discontinuous portion 21c may be provided at the center of the second conductor 21b.

The widths of the divided second conductors 21b are the same, and the positions of both ends of the first to third conductors in the width direction are the same as those of the second conductor 21b in order to improve the fastening property by the fastening members shown in FIGS. It is preferable that they are arranged in a straight line.

According to the results shown in Fig. 7, even when the bus bar is used as a three-step flat conductor 21 instead of one conductor, the current density is high in the width direction or in the vicinity of both sides, It can be confirmed that the density is low.

In the case where the bus bar is formed by arranging the flat conductors 21 of three stages instead of one conductor at regular intervals in parallel, it is confirmed that the overall current density is not high in the second conductor 21b disposed at the relatively central portion . That is, it can be confirmed that the current density is not higher than that of the conductor disposed at the outermost position due to the proximity effect, and in particular, the blue color becomes thicker toward the center in the width direction of the second conductor 21b, .

As a result, in the booth bar composed of the three-stage parallel conductors, the portion having the smallest role in the energization is small in the thickness direction or in the width direction center region rather than the thickness direction end portion (both sides) , It can be confirmed that the conductor arranged in three stages by the proximity effect is the smallest among the conductors arranged in the middle. Therefore, if a part of the specific conductor is removed in order to minimize the amount of conductors constituting the busbar, It can be inferred that the method of removing the central region in the width direction of the conductor, and furthermore, the center conductor in the width direction, is the most effective.

In the comparative example shown in Fig. 7, the thickness of the conductors is 15 millimeters (mm), and when the conductor of the bus bar is reduced experimentally to a size smaller than about 13 millimeters (mm) It is not preferable because the limit heat generation amount of the conductor can be easily reached at the time of energization.

In summary, when the thickness of a conductor constituting a bus bar is equal to or larger than a certain size, it can be assumed that there is no big problem from the viewpoint of energization capability even if the central portion in the width direction of the center conductor, not the outermost conductor, have.

The test results of the embodiment shown in FIG. 8 show that the booth bar, which is made of aluminum and has three steps of 15 mm (mm) width and 200 mm (mm) width, (39%) of the discontinuous portion 21c of the second conductor 21b constituting the first bus bar to the third bus bar when the (A) current is energized.

Among the results of the current density analysis, the portion where the cross section of the conductor is blue when the conductor is energized shows that the current density is the lowest and the current density is higher as it goes to yellow.

As described above, it was confirmed that even if a part of the central conductor of the bus bar provided with three conductors is removed, the entire current carrying capacity of the bus bar is not changed.

However, if the size of the discontinuity portion increases, the cross-sectional area of the entire conductor constituting one bus bar may be reduced and deterioration or damage of the molding portion due to heat may be generated. Therefore, (Limit) of the heating value of the fuel cell.

Fig. 9 shows a graph of the calorific value (heat generation loss) results of the bus bars according to the ratio of the discontinuities shown in Fig.

The green horizontal dotted line shown in the graph of Fig. 9 shows the upper limit of the limit heat generation amount of the conductor in which deterioration or damage of the molding portion does not occur.

As shown in FIG. 9, there is no problem of deterioration or ignition of the molding portion due to heat generation due to reduction of the conductor area until the discontinuity portion 21c of FIG. 8 reaches about 40%. However, It was confirmed that the limit heating value of the conductor causing the deterioration or damage of the molding part was overcome.

That is, the second conductor 21b of each of the bus bars in which the conductor 21 of the bus bar has a thickness of 15 millimeters (mm) and the width of which is 200 millimeters (mm) Even when the discontinuous portion 21c is formed to a degree of about 40% between the divided conductors 21b, it can be confirmed that there is no problem in heat generation of the bus bar due to reduction of the conductor capacity and the conductor capacity, It means that the conductors 21 of the bus bar can be reduced by about 14%.

Further, as the thickness of the conductor constituting the bus bar is increased, the size of the discontinuous portion will be described with reference to the comparative examples and embodiments shown in FIGS. 10 and 11. FIG.

The test results shown in FIGS. 10 and 11 show that when a bus-bar having three stages of three conductors each having a thickness of 20 millimeters (mm) and a width of 200 millimeters (mm) 10 in which the discontinuous portion 21c is absent and the discontinuous portion 21c of the second conductor 21b constituting the first bus bar to the third bus bar are 78% Current density analysis results.

Similarly, in the comparison shown in Figs. 10 and 11, it was confirmed that even if a part of the central conductor of the bus bar provided with three conductors in three stages was removed as in the above-described comparative example, I could.

In the embodiment shown in Fig. 11, when the thickness of the conductor is thicker than the embodiment shown in Fig. 8, even when the discontinuous portion 21c occupies about 80% of the second conductor 21b, It can be confirmed that there is no big problem, which means that the cross sectional area of the conductor 21 of the bus bar of one phase can be reduced by about 26%.

In the embodiment shown in FIG. 11, when the size of the discontinuous portion increases even when the thickness of the conductor increases, the cross-sectional area of the entire conductor constituting one bus bar is reduced and deterioration or damage of the molding portion due to the heat is caused It is necessary to examine the relation between the (limit) heat generation amount of the conductor and the removal rate of the intermediate conductor constituting the bus bar.

12 shows a graph of the calorific value (heat generation loss) results of the bus bars according to the ratio of the discontinuities of the intermediate conductors shown in Fig.

The green horizontal dashed line shown in the graph of FIG. 12 is a 4,000 amperes (A) in a busbar having three conductors each having a thickness of 20 millimeters and a width of 200 millimeters. The limit heating value of a conductor in which deterioration or damage of the molding portion does not occur during energization Of FIG.

As shown in FIG. 12, it can be seen that the problem of deterioration or ignition of the molding portion due to heat generation due to the reduction of the conductor area does not occur until the discontinuity portion 21c of FIG. 11 reaches approximately 80%.

The reason why the maximum ratio of the discontinuity portion 21c is different between about 40% and 80% in the results shown in Fig. 9 and in the result shown in Fig. 12 is presumed to be the influence of the thickness of the conductor constituting the side bars in the respective embodiments .

That is, when the thickness of the conductor constituting the bus bar is large, it is judged to be proportional to the ratio of the discontinuity 21c that can be removed. In the case where the other conditions are the same, when the bus duct is energized at 4000 amperes The total conductor cross-sectional area of the bus bar shown in Fig. 11 in which the thickness of the conductor is 20 millimeters (mm) and the discontinuity portion 21c is 80% is 15 mm and the discontinuity portion 21c is 40% Is wider than the entire conductor cross-sectional area of the bus bar shown in Fig.

For reference, in the embodiment shown in FIG. 11, when the discontinuous portion 21c is formed to have a size of 80% or more, the connection at the connection portion may be problematic.

As a result, it has been concluded that the amount of conductor consumption can be reduced by forming a discontinuity in the intermediate conductor constituting the busbar. It is expected that the thickness of the conductor and the removable ratio are roughly proportional to each other. Specifically, A review of the relationship is required.

13 shows the relationship between the thickness of the conductor constituting the bus bar and the maximum removable ratio of the intermediate conductor.

More in detail. Fig. 13 shows the cut-off ratio y% (%), which is the maximum eliminable ratio of the intermediate conductors according to the thickness x mm of the conductors when the bus bars of each phase are formed of three-stage conductors.

That is, in the blue graph of FIG. 13, the bus bar of one phase is constituted by a three-stage conductor and the conductor thickness varies from 13 millimeters (mm) to 1 millimeter (20 millimeters) (Cut-off ratio) of possible conductors in the limit heat generation amount of the conductor.

As shown in the blue graph of FIG. 13, it is assumed that the thickness (x, mm) of the conductor constituting the bus bar and the maximum removable ratio of the intermediate conductor, that is, the cutting ratio (%) are substantially proportional When fitting it with a linear function, it was confirmed that the relation y = 8.2x-90 was taken in consideration of the safety factor and the like. When the thickness of the conductor in the range of 13 mm to 20 mm was x mm (mm), deterioration or damage of the molding portion constituting the bus bar may not occur even if the maximum ratio of the discontinuous portion of the intermediate conductor other than the outermost conductor is set to y percent (%).

Therefore, when the thickness of the conductor is x millimeters (mm) in the range of 13 millimeters (mm) to 20 millimeters (mm), y (= 8.2x-90) , It can be confirmed that the amount of conductors constituting one phase of the bus bar can be minimized.

Thus, in the case of constructing a multiphase bus duct having a large power transmission capacity, if the conductors constituting the respective busbars are formed of one conductor having a large cross-sectional area, waste of the conductor may be generated due to skin effect or proximity effect The effect of the skin effect and the like can be minimized when the conductors constituting the bus bars of the respective phases are divided into a plurality of conductors. Further, when the conductors constituting the bus bars of the respective phases are constituted by three or more stages, The conductor, for example, the second conductor disposed in the center portion of the three-stage first to third conductors, does not make a large contribution to energization in the width direction center portion due to the proximity effect, If the thickness of the conductor is x millimeters (mm) in the range of 13 millimeters (mm) to 20 millimeters (mm), the intermediate conductors of the three- %) Or less, so that the amount of conductor used can be minimized.

While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims. . 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
20: Booth bar
21: Conductor
21c: discontinuous portion

Claims (9)

A plurality of bus bars having a plurality of conductors and a molding part surrounding the conductors; And
And a duct in which the plurality of busbars are spaced apart from each other,
Wherein the conductors of the booth bar are provided in three or more stages, and the conductors except for the outermost conductor are provided with a discontinuous portion in a cross section. The method according to claim 1,
Wherein a width of the conductor constituting the bus bar has a flat cross-sectional shape larger than the thickness, and is arranged in parallel and spaced apart in the molding part constituting the bus bar. The method according to claim 1,
Wherein the bus bar is provided with three conductors, and the discontinuous portion is formed by dividing the center conductor into two parts. The method of claim 3,
Wherein the width of the divided conductors is the same. 5. The method of claim 4,
Wherein positions of both ends in the width direction of the stacked conductors are arranged in a straight line. The method of claim 3,
Wherein the ratio of the discontinuous portion of the conductor provided with the discontinuous portion is determined so as to be within the limited heating value of the conductor constituting the bus bar when the bus bar is energized. The method according to claim 6,
Wherein a thickness of the conductor constituting the bus bar and an upper limit value of the discontinuous portion ratio are proportional to each other. The method of claim 3,
The removal rate of the intermediate conductors is not more than y (= 8.2x-90) percent (%) in the range of 13mm (mm) to 20mm (mm) Wherein the ducts of the booth ducts are connected to each other. A plate-shaped aluminum, aluminum alloy, copper or copper alloy conductor having N lengths (N is an integer of 3 or more) longer than the width; And
And a molding part of an epoxy material which surrounds the plurality of conductors so as to be spaced apart in parallel,
Wherein at least one of the conductors except the two conductors disposed at the outermost one of the conductors is divided in the width direction.

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