JPH022020Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention [Industrial application field] This invention is a two-dimensional design having a conductor dedicated to a 50% neutral wire and a 50% grounding wire used in electrical main lines in buildings, factories, etc.
Concerning a step-type closely insulated bus duct.

[Prior Art] In a large-capacity closely insulated bus duct, when 50% of the cross-sectional area of the phase conductor requires a conductor dedicated to the neutral line and 50% to the ground line, three-phase insulation coating is generally used as shown in Figure 2. On the side surfaces of the conductors A, B, and C, an insulated conductor N1 having a thickness of 1/2 that of the phase conductor is placed as a conductor for the neutral line, and further, a bare conductor having a thickness of 1/2 that of the phase conductor is placed on the outer side of the insulated conductor N1. A specially designed so-called 5-wire bus duct is used in which G1 is arranged as a dedicated grounding conductor.

[Problems that the invention aims to solve] However, since the conductors used in the above bus duct are of two types with different thicknesses, it is difficult to arrange materials, perform machining such as cutting, drilling, and bending the conductors, and insulate the conductors. , there are many work processes such as assembly, resulting in poor efficiency and high costs.

Therefore, there is a need for a tightly insulated bus duct having 50% neutral line conductor and 50% grounding conductor that eliminates the above problems, and the purpose of this invention is to meet this demand for a bus duct. .

B. Structure of the invention [Means for solving the problem] As a means for solving the problem, four insulated conductors are placed in one stage, three insulated conductors in the other stage, and one bare conductor on the side of the housing. A bus duct containing a bus duct in which each conductor has the same cross-section size, the rows of insulated conductors corresponding to the phases on both stages are used as three-phase conductors, and the insulated coated conductor on one side of the three-phase conductor is used as a neutral line conductor. ,
The bare conductor electrically connected to the housing of the other stage is configured as a conductor exclusively for the ground line.

[Function] Since all of the individual conductors constituting the three-phase conductor, the neutral line conductor, and the grounding line conductor have the same cross-sectional dimensions, the manufacturing process is made uniform.

[Example] In the example shown in FIG.
Four insulated conductors A1, B1, C are placed in the upper row of the
1 and N are provided together, and three insulated conductors A2, B2, and C2 and one bare conductor G are provided in the lower stage. The cross-sectional dimensions of each conductor are all the same.

The above conductors are insulated conductors A1, A2, B.
1, B2, C1, and C2 form upper and lower pairs to form a three-phase conductor, the insulated conductor N forms a neutral line conductor, and the bare conductor G forms a ground line dedicated conductor.
The upper and lower conductor groups are tightly tightened together with the housing side plates 11 and 12 by bolts and nuts 5 and 6 via spacers 3. Therefore, the outer surface of the grounding conductor G, which is a bare conductor, is electrically connected to the inner surface of the housing side plate 12.

Note that the upper and lower stage busbars corresponding to each phase of the three-phase conductor may be connected at appropriate locations in order to balance the current density.

Also, since the grounding conductor G is a bare conductor, if there is a gap equal to the thickness of the insulation coating of the neutral conductor N located at the upper stage, install an insulator such as a sheet between it and the insulation coating conductor C2. may also intervene. 6 in the figure is a housing assembly screw.

C. Effect of the invention The present invention provides a housing in which four insulated conductors are housed in one stage, three insulated conductors in the other stage, and one bare conductor on the side thereof. A bus duct whose conductors have the same cross-section dimensions, the rows of insulated conductors corresponding to the phases on both stages are used as the three-phase conductor, the insulated conductor on one side of the three-phase conductor is used as the neutral line conductor, and the other stages are used as the housing. Since the bare conductor to be electrically connected is configured as a conductor exclusively for the grounding line, all the conductors need to be of the same type with the same cross-sectional dimensions, and therefore there is no need for cutting, drilling, bending, etc. of the conductor. The number of work steps such as machining and insulation coating treatment is small, and assembly efficiency is very high.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of the tightly insulated bus duct of the present invention, and FIG. 2 is a vertical cross-sectional view of a conventional bus duct. 1 is the housing, 3 is the spacer, 4 is the bolt,
5 is a nut, 11 and 12 are side plates, 21 and 22 are upper and lower plates, A, A1, A2, B, B1, B2, C, C
1, C2 are phase conductors, N, N1 are neutral conductors,
G and G1 are conductors dedicated to grounding lines.

Claims (1)

[Scope of utility model registration request] A bus duct in which four insulated conductors are housed in one stage, three insulated conductors in the other stage, and one bare conductor on the side thereof in a housing, each of the conductors having the same cross section, and both stages thereof. The rows of insulated conductors corresponding to the phases are used as three-phase conductors, the insulated conductors on one side of the three-phase conductors are used as neutral line conductors, and the bare conductors electrically connected to the housing on the other stages are used as grounding conductors. A tightly insulated bus duct characterized by having the following structure.