KR20170051656A - Distribution panel - Google Patents

Abstract

The present invention relates to a distribution panel. More specifically, the present invention relates to a distribution panel having a bus bar cooled by natural convection. The distribution panel of the present invention comprises: an enclosure having a ventilation unit in an upper side; and a plate-shaped bus bar provided inside the enclosure to form a conduction path, and having a rectangular cross section. A wide surface of the bus bar faces both sides, and a narrow surface is orthogonally arranged to face upper and lower parts.

Description

{DISTRIBUTION PANEL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric distribution board, and more particularly to an electric distribution board having a bus bar cooled by natural convection.

Generally, the switchboard is a facility that can manage transmission and distribution of electric power such as receiving electric current from a power plant, substation, building or the like.

Among these switchboards, Metal Clad Switch Gear (MCSG) is a switchgear that is designed to receive high-voltage electricity, depressurize it appropriately to the load of each customer, and then to monitor and control electric devices and circuits to distribute the electricity, relays, Switchgear (CB), disconnector (DS), etc., and busbars are installed in one place.

FIG. 1 shows a schematic configuration of a general closed switchboard, and FIG. 2 schematically shows a structure of a bus bar installed in a closed switchboard according to the related art.

1, a closed switchboard typically includes an enclosure 10, a shield 20, and a busbar 30. [

The air inlet 12 is provided at the lower end of the enclosure 10 and the ventilation part 14 is provided at the upper end of the enclosure 10 so that air is circulated in the enclosure 10 from the lower side to the upper side by convection, ) To cool internal devices.

However, in the closed switchboard of the related art, as shown in FIG. 2, the busbar 30a on the bus side and the busbar 30b on the side of the switchgear for the instrument are arranged in a wide area in the horizontal direction, There is a disadvantage in that the cooling effect by convection air inside is inferior.

SUMMARY OF THE INVENTION It is an object of the present invention to at least partially solve the problems of the prior art as described above, and to provide an electrical switchboard having a bus bar having a structure capable of improving the cooling effect by air.

According to one aspect of the present invention, there is provided an electric vehicle including an enclosure having a ventilation part on an upper side thereof, and a plate-like bus bar provided inside the enclosure and constituting a current carrying path and having a rectangular cross- Wherein the bus bar is vertically disposed such that the wide side faces both sides and the narrow side faces up and down.

In one embodiment, the busbars may comprise a plurality of plate-shaped conductors disposed vertically and spaced apart from one another in a horizontal direction.

Further, in one embodiment, the plate-shaped conductor may have a rectangular cross-section, and the narrow plane may be rounded outwardly convexly.

In one embodiment, the enclosure includes a plurality of the busbars spaced apart from each other, through which currents of different phases are energized, and the plurality of busbars through which currents of different phases are energized are arranged in a horizontal direction .

Further, in one embodiment, an intake unit for introducing air into the inside of the enclosure may be provided under the enclosure.

According to an embodiment of the present invention having such a configuration, the area of heat exchange between the busbars and the air is increased, the area of the busbars against the air convected by the busbars is reduced, air circulation inside the enclosures is smooth, Can be improved.

1 is a schematic view showing a configuration of a general closed switchboard;
2 is a schematic view of a horizontally arranged bus bar structure installed in an ASSEMBLY according to the prior art.
3 is a schematic diagram of a vertically arranged bus bar structure included in an ASSEMBLY according to an embodiment of the present invention.
4 is a schematic view showing an internal configuration of an electric distribution board according to an embodiment of the present invention.
5 (a) and 5 (b) are graphs showing the results of a comparison between the temperature distribution (a) of the bus bars disposed vertically and the air flow (b) around the bus bars arranged horizontally .
6 (a) is a temperature distribution diagram of a bus bar bar composed of horizontal bus bars, and FIG. 6 (b) is a temperature distribution diagram of bus bar bars composed of vertical bus bars.
7 (a) is a temperature distribution diagram of the booster bar on the side of the transformer for the instrument comprising the horizontal booth bar, and Fig. 7 (b) is a temperature distribution diagram of the booster bar on the side of the transformer for the instrument composed of the vertical booth bar.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Furthermore, the singular forms "a", "an," and "the" include plural referents unless the context clearly dictates otherwise.

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

3 and 4, a switchboard 100 according to an embodiment of the present invention will be described.

3 and 4, the switchboard 100 according to an embodiment of the present invention includes an enclosure 110, a blocking unit 120, a current transformer 130, and a bus bar 140 .

The enclosure 110 is a cabinet-type structure in which the blocking part 120, the current transformer 130, and the bus bar 140 can be installed inside.

In an exemplary embodiment of the present invention, a lower portion of the enclosure 110 may include an intake unit 112 through which external air flows into the enclosure 110, And the ventilation part 114 may be provided.

In such an enclosure 110 structure, the air flowing into the intake unit 112 may be heated by heat exchange with the electric devices in the enclosure 110, and then convected to be discharged to the ventilation unit 114.

The cut-off portion 120 is provided inside the enclosure 110 and is capable of cutting off current flowing through the bus bar 140. The blocking unit 120 is not particularly limited, and may be constructed of a circuit breaker employing various known blocking methods such as a vacuum interrupting system or a vacuum interrupting system.

The current transformer 130 may be provided inside the enclosure 110 and may be provided to denature a high current to be applied to the bus bar 140 to a low current.

The bus bar 140 is provided inside the enclosure 110 and constitutes a conduction path of the main current, and may be formed in a plate shape having a rectangular cross section as a whole. The bus bar 140 may be connected between the bus bar and the cut-off part 120 and may be connected between the bushings through the breaker part 120 and the instrument current transformer 130.

In the present invention, the busbar 140 may be vertically arranged such that the wide side faces both sides and the narrow side faces up and down.

In one embodiment, the busbar 140 may comprise a plurality of plate-shaped conductors 141. Here, the plate-like conductor 141 is a flat shape having a rectangular cross section, and a plurality of plate-shaped conductors 141 may be overlapped in a horizontal direction so as to be spaced apart from each other.

Since the bus bar 140 arranged in the vertical direction has a large surface along the flow direction of the air flowing from the lower side to the upper side inside the enclosure 110, the contact area with the air increases, The heat exchange rate of the heat exchanger is increased.

3 and 4, in one embodiment, the plate-shaped conductor 141 constituting the bus bar 140 may be rounded so that the narrow sides of the upper and lower ends are convex outwardly . When the upper and lower ends of the plate-shaped conductor 141 are rounded outwardly, the occurrence of eddy currents is minimized at the upper and lower ends of the conductor, and air in contact with the surface of the conductor smoothly flows in contact with both surfaces of the conductor do.

Meanwhile, in one embodiment, the enclosure 110 may be provided with a plurality of bus bars 140 spaced apart from each other where currents of different phases are energized. That is, three bus bars 140 can be provided, through which three-phase currents can flow.

At this time, the enclosure 110 may be provided with a section in which three busbars 140, to which currents of different phases are energized, are arranged in a horizontal direction.

For example, in FIG. 3 and FIG. 4, the three-phase bus bar 140a on the bus bar and the three-phase bus bar 140b on the meter side can be arranged in the horizontal direction.

In such a structure, since the vertically arranged bus bars 140 increase the insulation distances between the horizontal and vertical bus bars installed in the closed switchboard according to the related art shown in FIG. 2, the insulation performance of the switchboard There is an advantage to improve.

For reference, the bent portions of the vertically arranged bus bars 140 may be formed by arranging two vertical bus bars 140 connected to each other at desired angles and bolt-joining the vertical bus bars 140 as shown in FIG.

On the other hand, FIGS. 5 to 7 show data for comparative experiments of the cooling efficiency of the bus bar structure arranged horizontally and the structure of the bus bar arranged vertically.

First, referring to Figs. 5 (a) and 5 (b), the difference in cooling efficiency between the horizontally arranged bus bars and the vertically disposed bus bars will be described. 5 (a) and 5 (b) show the results of a comparative experiment of the temperature distribution (a) of the bus bar vertically arranged horizontally and the air flow (b) around the bus bar FIG.

5 (a), the horizontal bus bar has a structure in which the plate-like conductors are superimposed on each other, and the vertical bus bars have a structure in which the plate-like conductors are superimposed in the horizontal direction. Here, it can be seen that the vertical type bus bar is lower in temperature than the horizontal type bus bar.

5 (b), it can be seen that the temperature difference between the vertical booth bar and the horizontal booth bar is caused by the flow characteristics of the air flowing along the surface of the booth bar. That is, in the case of the vertical type bus bar, the air flowing from the lower side to the upper side comes into contact with the entire wide surface of the bus bar, while in the case of the horizontal type bus bar, A portion that is not heat-exchanged with air is generated in the central portion of the upper surface of the busbar.

Accordingly, the vertical booth bar has a lower heat exchange area with respect to the air than the vertical booth bar, thereby lowering the cooling efficiency.

Further, as shown in FIG. 5 (b), since the space between the plate-shaped conductors spaced apart from each other is formed in the vertical direction, the air flowing from the lower side to the upper side is a space between the plate- However, since the horizontal bus bar is formed in a horizontal direction between the plate-shaped conductors, the air flowing from the lower side to the upper side is not introduced into the space between the conductors.

Therefore, since the vertical bus bar has a low heat exchange ratio between the plate-shaped conductor and the surface facing the other plate-shaped conductor, the cooling efficiency is lower than that of the horizontal bus bar.

As shown in Fig. 5 (b), since the vertical booth bar has a smaller area that obstructs the flow of the air convecting from the lower side to the upper side as compared with the horizontal bus bar, the circulation of the air inside the enclosure is smooth Thereby improving the cooling efficiency.

On the other hand, referring to Figs. 6A and 6B and Figs. 7A and 7B, when a horizontal busbar is installed on the busbar and the instrumental current transformer, and when the vertical busbar is installed, The temperature difference of the bar will be described.

6 (a) is a temperature distribution diagram of a bus bar bar made up of a horizontal booth bar, and FIG. 6 (b) is a temperature distribution diagram of a bus bar bar composed of a vertical booster bar. 7 (a) is a temperature distribution diagram of the booster bar on the instrument side for the instrument, and Fig. 7 (b) is a temperature distribution diagram of the booster bar on the instrument side for the instrument.

6 (a) and 6 (b), it can be seen that the temperature of the bus bar is generally lower than that of the vertical booth bar.

In the temperature comparative example, the temperature of the same point of the bus bar bar was measured, the temperature of the horizontal bus bar was measured at 361.37 K (absolute temperature), and the temperature of the vertical bus bar was measured at 353.91 K , And 7.46K, respectively.

7 (a) and 7 (b), it can be seen that the temperature compensator side booster bar also has a lower overall temperature than that of the horizontal booster bar case.

In the temperature comparative example, the temperature at the same point of the boiler bar on the instrument side was measured, the temperature of the horizontal bus bar was measured as 372.08 K, the temperature of the vertical bus bar was measured as 361.09 K, K, respectively.

While the present invention has been particularly shown and described with reference to particular embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention as defined by the following claims I would like to make it clear.

100: Switchboard
110: enclosure
112:
114: Ventilation part
120:
130: Current transformer
140: Booth bar
141: plate-shaped conductor
140a: bus bar bus bar
140b: Current transformer side bus bar

Claims (5)

An enclosure comprising: an enclosure having a ventilation part on an upper side; and a plate-like bus bar provided inside the enclosure to form a current carrying path and having a rectangular cross section,
Wherein the busbars are vertically arranged such that the wide side faces both sides and the narrow side faces up and down.
The method according to claim 1,
Wherein the bus bar comprises a plurality of plate-shaped conductors disposed vertically and superimposed in a horizontal direction so as to be spaced apart from each other.
3. The method of claim 2,
Wherein the plate-shaped conductor has a rectangular cross-section, and the narrow side is rounded outwardly convexly.
The method according to claim 1,
Wherein a plurality of the busbars to which currents of different phases are energized are spaced apart from each other,
Wherein a plurality of bus bars, through which currents of different phases are energized, are arranged in a horizontal direction.
The method according to claim 1,
And an air intake unit for introducing air into the enclosure under the enclosure.

Images