KR101941981B1 - Bus Bar Insulation Coating Method of Distribution Board - Google Patents

Abstract

The present invention relates to a bus bar electrically connecting a bus bar extended from a main power breaker of a distribution board and a bus bar extended from a sub power breaker so as to branch current to the sub power breaker and, more specifically, to an insulation coating method of a bus bar of a distribution board, in which only one portion is electrically connected and other portions are insulated in interconnection between a plate-structured bus bars, such that current is branched to a conducted bus bar. To achieve this, according to the present invention, the insulation coating method performs insulation coating to a bus bar in order to allow a plurality of plate-structured bus bars extended from a main power breaker of a distribution board and a plurality of plate-structured bus bars extended from a sub power breaker to come into contact with any one point and be insulated at other portions. The insulation coating method comprises: a step of processing bus bars to be interconnected with each other; a step of masking a connection portion; a step of coating powder coat on the bus bars; a step of heating the bus bars having the powder coat coated thereon to form the powder coat into an insulation layer; and a step of removing a masking member.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a Bus Bar Insulation Coating Method,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bus bar that extends from a main power source circuit breaker of a distribution board and branches a current to a sub power source breaker by energizing a bus bar extending from the auxiliary power source breaker, To a method of insulated coating on a bus bar so that the current flowing through the bus is branched.

A distribution board (distribution board) is a device that branches and rewires the main lines wired in the switchboard. It is made up of extremely simple ones with cutout switches or knife switches arranged on a wooden board, a plurality of branch switches, A bus bar is mounted, or a plurality of unit switches are assembled in a box made of steel plate.

1 is a perspective view showing a conventional distribution board.

A plurality of auxiliary power source breakers 12 that are supplied with power from the main power source circuit breaker 11 and a main power source breaker 12 connected to the main power source circuit breaker 11, And a branch bus bar 3 electrically connected to the bus bar 2 and the auxiliary power breaker 12 for distributing power to the auxiliary power breaker 12 have.

In order to branch the power supply to the auxiliary power breaker 12 which cuts off the overload while supplying power to the various electric devices, a bus bar bus bar (not shown), which is electrically connected to each output terminal 11T of the main power switch breaker 11 2) to be electrically connected by fastening the branch bus bar (3). However, if the branch bus bar 3 fastened to one bus bar 2 is brought into contact with the other bus bar bar, electrical short-circuiting occurs. Therefore, the branch bus bar 3 may be bent The other bus bar bar is held at a predetermined interval, and the branch bus bar and the bus bar bar are fastened using the screw 5 at the bent position of the branch bus bar.

However, in the above-described conventional system, the branch bus bar 3 must be bent and used to branch power from the bus bar 2 to the auxiliary power breaker 12, and the branch bus is bent according to the circuit of the distribution board Since the shape must be different, the manpower required for fabrication and assembly is expensive. Further, when a change such as addition or deletion of a circuit occurs in the distribution board, the already bent branch bus bar can not be used and the additional cost is increased.

Also, as shown in FIG. 1, since the bus bar and the branch bus bar are connected to the main power circuit breaker and the auxiliary power circuit breaker in a non-insulated state, impurities flow into the main power circuit breaker and the auxiliary power circuit breaker.

Registered Utility Model No. 20-0436524 of the Republic of Korea (Notice: 2007.09.03)

Disclosure of the Invention The present invention has been made in order to solve the problems of the prior art as described above, and it is an object of the present invention to provide a bus bar insulated painting board of a distribution board configured to be connected only to bus bars set in a flat plate structure, The purpose is to provide a method.

In order to achieve the above object, according to the present invention, a plurality of bus bars of a flat plate structure extending from a main power source circuit breaker of a distribution board, a plurality of bus bars of a flat plate structure extending from an auxiliary power source breaker are connected at one point, A method for insulated coating on a bar, comprising the steps of: machining the bus bars so that they are mutually connected; masking the connection site; applying the powder coating to the bus bar; heating the bus bar to which the powder coating has been applied to heat the powder coating to the insulating layer A step of molding, and a step of removing the masking member.

Further, according to a preferred embodiment of the present invention, the method further comprises heating the masked bus bar in an oven.

Further, according to a preferred embodiment of the present invention, the method further includes cooling the bus bar having the insulating layer formed thereon.

Further, according to a preferred embodiment of the present invention, the bus bar is made of copper.

Further, according to a preferred embodiment of the present invention, after the step of processing the bus bars so as to be interconnected, ultrasonic cleaning of the bus bars and chromium or tin plating are further included.

Further, according to a preferred embodiment of the present invention, the bus bar is made of aluminum.

According to a preferred embodiment of the present invention, the thickness of the insulating layer is 500 mu m to 700 mu m.

Further, according to a preferred embodiment of the present invention, in the step of heating in the drying furnace, the bus bar is heated to 200 ° C to 250 ° C.

According to a preferred embodiment of the present invention, in the step of forming the powder coating material into the insulating layer, the bus bar is heated to 180 ° C to 200 ° C.

As described above, in the bus bar insulating painting method of the distribution board according to the present invention, a bus bar of a flat plate structure is formed by insulating insulating coating layers on the remaining portions except the conductive portion, The size of the distribution board can be reduced, and the amount of bus bars can be also reduced.

In addition, the bus bar insulating coating method of the present invention can be formed to have the thickness desired for forming the insulating layer in consideration of the material of the bus bar, that is, the characteristics of the copper material and the aluminum material, Thereby increasing the width and reducing the opportunity cost.

In addition, the bus bar insulating painting method of the distribution board of the present invention has an advantage that the risk of fire occurrence can be reduced when a high voltage electric current is applied by forming a quasi-nonflammable insulating powder coating layer.

1 is a perspective view showing a conventional distribution panel.
2 is a perspective view showing a state where the protective cover of the distribution board according to the present invention is removed,
3 is a longitudinal cross-sectional view of the bus bar shown in Fig. 2,
Fig. 4 is a longitudinal sectional view of the branch bus bar shown in Fig. 2,
5 is a perspective view showing the bus bar of the distribution board shown in Fig. 2 in an exploded manner.
6 is a flowchart illustrating a bus bar manufacturing process of a distribution board according to a first embodiment of the present invention.
7 is a flowchart illustrating a bus bar manufacturing process of a distribution board according to a second embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of a bus bar insulation painting method of a distribution board according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a longitudinal cross-sectional view of the bus bar shown in Fig. 2, Fig. 4 is a cross-sectional view of the branch bus bar shown in Fig. 2, Fig. And FIG. 5 is a perspective view showing the bus bar of the distribution board shown in FIG. 2 in an exploded manner. FIG. 6 is a flowchart illustrating a process of manufacturing a bus bar of a distribution board according to a first embodiment of the present invention, and FIG. 7 is a flowchart illustrating a process of manufacturing a bus bar of a distribution board according to a second embodiment of the present invention.

2, the distribution board 100 includes a main power circuit breaker 110 receiving power transmitted from the outside, a plurality of bus bus bars 120 (not shown) connected in parallel to the terminals 110T of the main power circuit breaker 110, A plurality of auxiliary power breakers 130 arranged on both sides of the bus bar 120 and a plurality of bus bars 130 connected to the terminals 130T of the auxiliary power breaker 130, And a branch bus bar 140 connected to any of the bus bars 120 of the bus bars 120.

3, the branch bus bar 140 is connected to each of the bus bus bars 120 at one point or more in the longitudinal direction thereof. As shown in FIG. 2, And are connected by the number of auxiliary power circuit breakers 130 aligned on one side in the longitudinal direction.

On the other hand, each branch bus bar 140 is connected to only one of the plurality of parallel bus bus bars 120, as shown in FIG.

When the same main power interrupter 110 and the auxiliary power interrupter 130 are fixed at the same position for each of the distribution boards 100 according to this characteristic, the length of the bus bus bar 120, the length of the bus bar 120, The length of the connection portion 140 and the connection portion C become the same.

Therefore, the bus bus bar 120 and the branch bus bar 140 according to the present invention are provided with end portions 120E and 140E connected to the terminals 110T and 130T of the circuit breakers 110 and 130 and bus bars 120 and 130 The entire bus bars 120 and 130 are covered with the insulating layer 150 except for the connecting portion C to which the bus bar 120 and the branch bus bar 140 are connected.

The thickness of the insulating powder coating layer as the insulating layer 150 is 500 mu m to 700 mu m.

The insulating layer 150 will be described in detail in a bus bar insulating painting method of a distribution board.

As shown in FIGS. 3 and 4, the bus bar 120 and the branch bus bar 140 are insulated by the insulating layer 150 except for the set connection portion C and the end portions 120E and 140E, respectively Even if the bus bus bar 120 and the branch bus bar 140 are touched at a portion other than the set connection portion C, the power is not supplied, and therefore, there is no short circuit problem.

On the other hand, since the insulating layer 150 having a size of 500 mu m to 700 mu m is formed on the bus bus bar 120 and the branch bus bar 140, the connection portion C between the bus bus bar 120 and the branch bus bar 140 The gap G between 1 mm and 1.4 mm is formed by the thickness of the insulating layer 150, and the energizing spacer 160 is positioned to compensate the gap G. [

The thickness of the energizing spacer 160 is equal to or greater than twice the thickness of the insulating layer 150 and is between 1 and 1.6 mm to energize the bus bus bar 120 and the branch bus bar 140.

Bolt holes 140H and 160H are formed in the centers of the connecting portion C of the branch bus bar 140 and the energizing spacer 160 for fixing the bus bus bar 120 and the branch bus bar 140, The connection portion C of the bus bar 120 is formed with a tab 120T. The fastening bolt 170 is inserted into the bolt hole 140H of the branch bus bar 140 and the bolt hole 160H of the energizing spacer 160 and then fastened to the tab 120T of the bus bar 120 The bus bus bar 120 and the energizing spacer 160 and the branch bus bar 140 are fixed.

One end of the bus bar 120 is connected to the main power circuit breaker 110 and the other end is fixed to the support 103. The end of the bus bus bar 120 is also connected to the terminal 110T of the main power circuit breaker 110 as an uncoated end portion 120E to be energized.

Both ends of the branch bus bar 140 are also connected to the terminal 130T of the auxiliary power breaker 130. The height of the terminal 130T of the auxiliary power circuit breaker 130 is set to be greater than the height G of the terminal 110T of the main power circuit breaker 110 by the gap G between the bus bus bar 120 and the branch bus bar 140, ) ≪ / RTI > thick.

On the other hand, a transparent cover 105 is mounted on the panel 101 of the distribution board 100. The transparent cover 105 covers the terminal 110T of the main power circuit breaker 110, the terminal 130T of the auxiliary power breaker 130 and the bus bar bus 120 and the branch bus bar 140 A nut is fastened to the bolt with the bolt of the post 101P fixed to the panel 101 passing through both ends of the transparent cover 105 to fix the transparent cover 105. [

The transparent cover 105 covers and protects the terminal 110T of the main power interrupter 110, the terminal 130T of the auxiliary power interrupter 130 and the bus bus bar 120 and the branch bus bar 140, And electric shock can be solved, and the circuit configuration of the distribution board 100 can be easily checked from the outside.

Hereinafter, the painting method of the bus bars 120 and 140 described above will be described in detail.

The materials of the bus bars 120 and 140 are largely classified into copper (Cu) or aluminum (Al).

In the case of the copper bus bars 120 and 140, the painting step is performed in accordance with the flowchart in FIG. 6, and in the case of the aluminum bus bars 120 and 140, the painting step is performed in accordance with the flowchart shown in FIG. do.

The step of painting the bus bars 120 and 140 of the same material is performed by the bus bars 120 and 140 installed on the bus bars 120 and 140 according to the design area and design thickness of the bus bars 120 and 140 A step S30 of masking the connection portions C and the end portions 120E and 140E of the bus bars 120 and 140 with a masking tape or a silicon band or the like; (S50) of immersing the heated bus bars (120, 140) in a powder coating bath and applying the same (S50); heating the bus bars (120, 140) (S60) of placing the coated bus bar into a heating furnace and then molding (S70) a step of cooling the heated and formed bus bar (S70).

In the following, we explain the characteristics of each step in detail.

The bus bus bar 120 and the branch bus bar 140 are connected to the terminal 110T of the main power circuit breaker 110 and the terminal 130T of the auxiliary power circuit breaker 130 as shown in FIG. The bus bar 120 is formed with a bolt hole and the bus bar 120 and the branch bus bar 140 are mutually connected to each other. The bus bar 140 is formed with a bolt hole 140H.

In operation S10, the bolt hole 140H, the bolt hole at the end portion, and the tab 120T are machined at predetermined positions on the bus bars 120 and 140 made of copper.

The point where the bolt holes and the tab 120T are formed in the machined bus bars 120 and 140 is a point where the terminals 110T and 130T are contacted or the bus bar 120 and the branch bus bar 140 are in contact with each other In the next masking step S30, a masking process is performed using a masking tape or a silicon band at a connection point to which electricity is applied (S30).

In the masking step S30, it is preferable that the thickness of the masking member is as thick as possible than the thickness of the insulating layer of 500 to 700 mu m.

The masked bus bars 120, 140 enter the interior of the drying oven along the conveyor in the state of being hooked onto the hook of the conveyor. The end portions of the bus bars 120 and 140 are portions to be connected to the terminals 110T and 130T of the circuit breakers 110 and 130 in the process of placing the bus bars 120 and 140 on the hooks of the conveyor, . Thus, it is desirable to secure the ends of the bus bars 120, 140 to the hooks or clips of the conveyor.

In the drying furnace, the bus bars 120 and 140 are heated to 200 ° C to 250 ° C. As the bus bars 120 and 140 are heated in the drying oven, the paint thickness of the powder coating to be subsequently turned on is determined.

When the temperature of the bus bars 120 and 140 heated in the drying furnace is less than 200 ° C, the thickness of the powder coating painted on the bus bars 120 and 140 is less than 500 μm and the thickness of the insulating layer 150, If the temperature exceeds 250 DEG C, the thickness of the coated insulating layer 150 becomes thicker than necessary, cracks are generated, and defects occur.

On the other hand, when the bus bars 120 and 140 are heated to 200 ° C. to 250 ° C. in the drying furnace, water and the like of the bus bars 120 and 140 are dried to prevent separation of the bus bars 120 and 140 from the insulating layer 150 .

The bus bars 120 and 140 heated in the drying furnace are immersed in the powder coating material filled in the powder coating bath while moving along the conveyor so that the powder coating is applied to the bus bars 120 and 140.

The bus bars 120 and 140 to which the powder coating is applied enter the heating furnace along with the conveyor and are heated. As the bus bars 120 and 140 are heated in the heating furnace, the coated powder coating is formed. The heating temperature of the bus bar in the heating furnace is 180 ° C to 200 ° C.

Here, the powder coating material is not molded when heated to less than 180 캜 in a heating furnace, and cracking occurs during molding if the temperature exceeds 200 캜. When cracks are generated in the insulating layer 150, the bus bars 120 and 140 are defective.

As described above, in the bus bars 120 and 140, an insulating layer 150 having a thickness of 500 mu m to 700 mu m is formed in the remaining portions except for the connecting portion C and the end portions 120E and 140E, 140 are installed on the circuit breakers 110 and 130 of the distribution board 100, the portions where the insulating layers 150 are formed on the bus bars 120 and 140 are insulated even if they are in contact with each other, but the insulating layers 150 are not formed The connection portions C of the bus bars 120 and 140 are energized and energized by the energizing spacer 160 between the main bus breaker 110 and the auxiliary power breaker 130.

The insulating layer 150 formed by molding the powder coating preferably has a thickness of 500 mu m to 700 mu m.

The maximum voltage applied to the panel 100 is about 3000 V. When the thickness of the insulating layer 150 is less than 500 탆, the withstand voltage of about 3000 V can not withstand the insulating layer 150, If the thickness exceeds 700 탆, brittleness occurs depending on the characteristics of the insulating layer 150 formed by the powder coating, and the occurrence of cracks increases remarkably.

The bus bars 120 and 140 having the insulating layer 150 formed thereon are subjected to an air cooling step for cooling in the atmosphere, and then the masking member is removed to enable energization.

On the other hand, the above-described bus bar insulating coating method is a method of forming a powder paint insulating layer on a bus bar made of the same material, and a process of forming a powder paint insulating layer on an aluminum bus bar will be described below.

The aluminum bus bars 120 and 140 are subjected to a machining step S10 in which bolts and taps are machined at predetermined positions on the bus bars 120 and 140 as in the insulating coating method of the bus bars of the same material.

In the preprocessing step S20, the bus bars 120 and 140 made of aluminum are subjected to ultrasonic cleaning (S21) to remove foreign matter and foreign matter from the bus bars. Particularly, aluminum exposed in the air is oxidized to form a thin alumina (Al 2 O 3) layer. However, as the alumina is formed, the conductivity is deteriorated and the separation of the insulating layer 150 occurs.

Accordingly, the aluminum bus bars 120 and 140 remove the foreign substances adhered to the surface through the ultrasonic cleaning (S21) after processing the bolt holes and the tabs 120T and the like.

And is plated so as to prevent the formation of alumina and smoothly apply the powder coating material.

Bus bars 120 and 140 perform chromium or tin plating (S22) to prevent oxidation of aluminum.

After the chromium or tin plating (S22), the aluminum bus bars 120 and 140 are fixed to hooks or clips of the conveyor after the masking step S30 and are heated to 200 ° C to 250 ° C (S40).

Then, as described above, the coating material is immersed in the powder coating material filled in the powder coating material tank, and the coating material is applied to the bus bar (S50). The coating material is then heated by the conveyor. As the bus bars 120 and 140 are heated in the heating furnace, the coated powder coating material is formed (S60), and the heating temperature of the heating furnace is 180 ° C to 200 ° C.

The detailed description of the masking step S30, the heating step S40 in the drying furnace, the coating step S50 and the heating molding step S60 in the heating furnace is replaced with a detailed description of each step described above. Then, the substrate is cooled by air cooling in a state where the insulating layer is formed by heating, and the masking member is removed.

100: Distribution board
101: Panel
110: main power breaker
120: bus bus bar
130: Auxiliary power breaker
140: Branch bus bar
150: insulating layer
160: energizing spacer
170: fastening bolt
G: Spacing

Claims (9)

A plurality of bus bars 120 having a flat plate structure extending from the main power circuit breaker 110 of the distribution board 100 and a plurality of bus bars 140 having a flat structure extending from the auxiliary power circuit breaker 130 are connected to the spacers 160, and is insulated at other portions,
Processing the bus bars to interconnect,
Masking the connection site;
Applying a powder coating to a bus bar,
Heating the bus bar coated with the powder coating material to form the powder coating material into an insulating layer,
Removing the masking member,
A spacer 160 is provided between the bus bar 120 extending from the main power circuit breaker 110 and the bus bar 140 extending from the auxiliary power breaker 130 through a spacer 160 having a thickness of 1 mm to 1.6 mm, And the thickness of the spacer 160 is 500 to 700 mu m which is half or less of the thickness of the spacer 160. [
The method according to claim 1,
Further comprising the step of heating the masked bus bars in an oven.
3. The method according to claim 1 or 2,
Further comprising the step of cooling the bus bar having the insulating layer formed thereon.
3. The method according to claim 1 or 2,
Wherein the bus bar is made of a copper material.
3. The method according to claim 1 or 2,
After the step of processing the bus bars to interconnect,
Ultrasonic cleaning the bus bar,
Chromium or tin plating on the bus bars of the distribution board.
6. The method of claim 5,
Wherein the bus bar is made of an aluminum material.
delete 3. The method of claim 2,
And heating the bus bar to 200 DEG C to 250 DEG C in the step of heating in the drying furnace.
3. The method according to claim 1 or 2,
Wherein the step of forming the powder coating material into an insulating layer comprises heating the bus bar to 180 to 200 占 폚.

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