JPH035006B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing an insulating resin-coated conductor bar coated with a thermosetting insulating resin, such as a bus bar of a high-voltage switchboard. The thickness of the insulating resin coating varies depending on the voltage, but it is usually 0.5 to 3 mm.

Generally, in order to form an insulating resin coating on a conductor bar, masking is applied to the parts of the connection where insulation is not applied, and then a thermosetting powder insulating resin is applied using a fluidized dipping method or a hot spraying method. Although the masking material is removed, it is desirable that the manufacturing method including the masking step be as simple as possible, requiring fewer man-hours, and that the thickness of the insulating film be uniform and the finish to be beautiful.

[Conventional technology]

Conventionally, as shown in FIG. 1, an insulating end portion 1a of an insulating tree-covered conductor bar 1 is exposed and an insulating coating 2 of thermosetting insulating resin is formed on an insulating portion 1b. 3 is a bolt hole for connecting the conductor bar.
In order to manufacture such an insulating resin-coated conductor bar, as shown in FIG. 2, an adhesive heat-resistant tape 4 is wound and adhered at the boundary between the exposed part 1a of the conductor bar 1 and the insulating part 1b, and then a Insert the silicone rubber band 5 and cover the remaining exposed portion 1a with a masking polyester film 6 with adhesive heat-resistant tape 4'
After binding the conductor bar with a heating furnace and applying powder insulating resin to the insulating part 1b by a fluidized dipping method or a spray coating method to form an insulating coating 2, a knife is used as shown in FIG. 7, the polyester film 6 was removed, followed by the silicone rubber band 5 and the adhesive heat-resistant tape 4. In this case, the masking material must be removed while the temperature is high before the resin hardens, and it is difficult to remove the masking material after cooling. Moreover, the adhesive of the adhesive heat-resistant tape remained attached to the connecting end 1a, and it took time and effort to remove it.
In addition, as shown in Fig. 4, it is difficult to mask when the connection contact portion 1c of the conductor bar 1 is localized, so masking is applied to a wide area on both sides of the connection end as shown in Figs. 1 to 3 to expose it. The exposed part of the connecting conductor was taped with insulating tape or covered with an insulating cap.

Problems to be solved by the invention As a result, masking work is time-consuming, and
The drawback was that it took a lot of man-hours to insulate the conductors after connecting them.

The object of the present invention is to eliminate the above-mentioned drawbacks, provide a method for manufacturing an insulating resin-coated conductor bar, which allows easy masking work, allows for clean insulating resin coating, and does not require time and effort for insulation work after conductor connection. do.

[Means to solve the problem]

According to the present invention, the above object is to provide a plate-shaped masking material that covers only the connection surface of the conductor bar, is thicker than the thickness of the insulating resin coating applied to the conductor bar, and has a peeling effect on the thermosetting insulating resin. This is achieved by applying a curable powder insulating resin to the conductor bar by a fluidized dipping method or a hot spraying method to form an insulating coating, and then removing the masking material.

In this case, a plate-shaped masking material made of polytetrafluoroethylene can be used as the plate-shaped masking material.

Further, the plate-shaped masking material can be pressure-welded by using various known means, but according to the embodiment of the present invention, it is possible to tighten the plate-shaped masking material with bolts using the connection bolt holes on the connection surface of the conductor bar. It is advantageous to do it side by side.

〔Example〕

FIG. 5 is a perspective view showing a masking state in a method for manufacturing an insulating resin-coated conductor bar according to an embodiment of the present invention, and FIG. 6 is a sectional view taken along line AA in FIG. Components designated by the same reference numerals as in FIGS. 1 to 4 are the same parts. A plate-shaped masking material 8 having a mold release effect on the thermosetting resin is brought into contact with the connection surface 1c of the conductor bar 1 by tightening bolts 9 and nuts 10 using the connection bolt holes 3. In this case, the thickness of the masking material 8 is made thicker than the thickness t of the insulating resin coating to be coated,
Chamfered portion 8a on the outer periphery of the upper surface of the part that protrudes from the coating.
It is set up. In addition, on the back side of the connection surface of the conductor bar 1, a disc-shaped masking material 8' having the same thickness as the masking material 8 is provided on the surface 1d in contact with the washer of the connection bolt.
is in contact with. In this state, the conductor bar is heated in a heating furnace, and a hardening powder insulating resin is applied by a fluidized dipping method or a spray coating method. FIG. 7 is an enlarged cross-sectional view of a masking portion during insulating resin coating.
An insulating resin film 2 having a required film thickness t is formed around the masking material 8, and the masking 8 can be easily removed by removing the bolts 9. The tapered portion 8a of the masking material 8 has the effect of facilitating removal and making the boundary finish of the insulating film neat.

When the thermosetting resin used as a masking material is an epoxy resin, polytetrafluoroethylene material has an excellent mold release effect, and if polytetrafluoroethylene is used, it can be used even after the resin has hardened and the conductor bar has cooled. Masking can be easily removed. Silicone materials are also used for masking, but they require more effort to remove than polytetrafluoroethylene, and the finish is less beautiful. Although polytetrafluoroethylene material is expensive, it only needs to be used in a small amount and can be used repeatedly.

FIG. 8 is a plan view of an example of connection of insulating resin-coated conductor bars manufactured according to the present invention, and FIG.
It is a sectional view taken along arrow A. The end face of another insulating resin-coated conductor bar 11 is butt-connected to the insulating resin-coated conductor bar 1. The conductor bar 1 is manufactured by masking only the connection contact surface by the method described above, and the conductor bar 11 has the butt end 11a.
An insulating resin film is formed by masking. After the two are butt-connected, they are fixed with a connecting bolt 12, and the bolt head is covered with an insulating cap 13. An insulating packing 14 is sandwiched between the insulating coating of the conductor bar 1 at the abutting corner portion and the insulating coating at the abutting end of the conductor bar 11. Therefore, insulation work after connection is almost unnecessary.
The insulating cap 13 can be standardized and used at low cost.

〔Effect of the invention〕

According to the present invention, the connecting portion of the insulating resin-coated conductor bar is locally masked, and the masking can be easily removed, resulting in a clean finish, and almost no insulation work is required after connection, which reduces man-hours, improves quality, and reduces costs. effective.

[Brief explanation of the drawing]

Figure 1 is a partial perspective view of an insulated resin coated conductor bar manufactured by a conventional method, Figures 2 and 3 are perspective views showing the masking process, and Figure 4 is an insulated resin conductor bar with local contact surfaces. , FIG. 5 is a perspective view showing the masking state of the method for manufacturing an insulating resin-coated conductor bar according to an embodiment of the present invention, FIG. 6 is a sectional view taken along line A-A in FIG. 5, and FIG. 7 is an insulating FIG. 8 is a plan view of a connection example of an insulating resin-coated conductor bar manufactured according to the present invention, and FIG. 9 is a cross-sectional view taken along the line A--A in FIG. 8. 1... Conductor bar, 2... Insulating coating, 3... Connection bolt hole, 8, 8'... Plate masking material, 9...
... Bolt, 10 ... Nut, 11 ... Insulated resin coated conductor bar, 12 ... Connection bolt, 13 ... Insulation cap, 14 ... Insulation packing.

Claims (1)

[Claims] 1. A plate-shaped masking material that covers only the connection surface of the conductor bar and is thicker than the insulating resin coating applied to the conductor bar and has a peeling effect on the thermosetting insulating resin is pressure-welded. , an insulating resin-coated conductor bar characterized in that the masking material is removed after the conductor bar is coated with a thermosetting powder insulating resin by a fluidized dipping method or a hot spraying method to form an insulating coating. Production method. 2. In the method described in claim 1,
A method for manufacturing an insulating resin-coated conductor bar, characterized in that the plate-like masking material is made of polytetrafluoroethylene. 3. The method according to claim 1 or 2, characterized in that the plate-like masking material is pressure-welded by tightening with bolts using connection bolt holes in the connection surface of the conductor bar. A method for manufacturing an insulating resin-coated conductor bar.