JP2003052106A - Structure of arrangement of conductor in distribution board and leader conductor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem, when power supply-side conductors, placed opposite to each other, with a second conductor in a third phase in-between, are connected with each other and the second conductor, is led out between the power supply-side conductors, the distance between the power supply-side conductors in interphases having to be increased or the power supply-side conductors must be bypassed, when the second conductor is led out for the prevention of problems associated with insulation distance. SOLUTION: At a crossing portion, where longitudinal bus conductors in three phases and second conductors cross, longitudinal bus conductors 10A and 10C in both-side phases are bent, so as to be widened outward to form bent portions 12A and 12C. The longitudinal bus conductor 10B in the intermediate phase is bent, to the same side as that of either 12A of the bent portions to form an intermediate bent portion 12B. A second conductor 7A in a first phase is led out between the intermediate bent portion 12B and the bent portion 12A bent to the same side as that of the intermediate bent portion, and second conductors 7B and 7C in second and third phases are led out between the bent portions 12B and 12C bent to the opposite sides to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arrangement of a conductor on a power source side and a conductor on a load side, a conductor of a switchboard for housing them, and a switchboard in which an end face shape of a grounding metal plate arranged in proximity to the conductor is improved. The present invention relates to a conductor arrangement structure and a lead conductor.

[0002]

2. Description of the Related Art Generally, a conductor arrangement structure in a switchboard is such that a conductor is arranged on a grounding metal plate on a side surface of the switchboard or a support insulator having a specified creepage insulation distance in a grounded metal fitting installed in the switchboard and having a different phase. Dielectric breakdown does not occur assuming a needle-flat plate structure conductor or a grounded metal plate where the electric field is most concentrated in the air insulation for the distance between conductors and the distance between the conductor and the grounded metal shield plate that constitutes the switchboard. It is configured with the distance dimension.

In addition, there are some switchboards that are entirely composed of insulated wires in a system with a small short-circuit current, but a switchboard with a system with a large short-circuit current or a system with a large current-carrying has a current-carrying capacity or thermal / mechanical characteristics at the time of short-circuit. It is made of a conductor in consideration of the influence of the influence.

[0004]

In order to reduce the external dimensions of the switchboard that houses the power source side conductor and the load side conductor which have intersected with each other, the dimension between the different phase conductors and the distance between the conductors to the ground, that is, the ground, have been reduced. There are demands for reducing the size of insulation between metals, downsizing the switchboard, and reducing the power loss of the load-side conductor. As a technique relating to the arrangement of the load-side and power-source-side conductors in the switchboard, Japanese Patent Laid-Open No. 63-178705.
The gazette can be mentioned.

An object of the present invention is to provide a downsized switchboard while reducing power loss.

[0006]

In order to achieve the above-mentioned object, in the present invention, the busbar conductors of both phases are placed outside at the intersection where the three-phase busbar conductor and the load-side second conductor intersect. A curved portion that is curved so as to spread is formed, an intermediate curved portion that is formed by bending the intermediate-phase busbar conductor to one side and the same side of the curved portion is formed, and one phase is formed between the curved portions that are curved to the same side. It is characterized in that the second conductor and the two-phase and three-phase second conductors are drawn out from between the curved portions that are curved on opposite sides.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. In FIG. 1, an upper circuit breaker 2 and a lower circuit breaker 3 are arranged in a two-stage stack in a switchboard 1.
The upper-stage circuit breaker 2 and the lower-stage circuit breaker 3 are each provided with a three-phase power source side connecting portion 4 and a load side connecting portion 5. The power source side connecting portion 4 and the load side connecting portion 5 are supported by the partition plate 1A of FIG. The support plate 1A is provided in the switchboard 1. Both connection parts are connected to the power bus 6 and the load-side conductor 7.

By moving the upper circuit breaker 2 and the lower circuit breaker 3 from the position A to the position B, the power source side connecting portion 4 and the load side connecting portion 5 electrically contact the power source bus bar 6 and the load side conductor 7. To do. When the position B is moved to the position A, the breaker is electrically cut off.

The three-phase power bus 6 is supported by an insulator 8 mounted on the ceiling surface of the switchboard 1. A vertical busbar conductor 10 connects the same side of the upper circuit breaker 2 and the lower circuit breaker 3, that is, between the power source side connection portions 4 of the same. Vertical bus conductor 10
Is connected to the three-phase power bus 6. Three-phase vertical bus conductor 1
Partition plate 1A with the three-phase load-side conductor 7 so as to intersect with 0
Is connected to a load such as a motor or an electric light, and a current transformer 11 is connected in the middle thereof.

As shown in FIG. 2, the three-phase vertical busbar conductor 10 has curved portions 12A, 12C that spread the left-right phase vertical busbar conductor 10A and the vertical busbar conductor 10C outward. The intermediate-phase vertical busbar conductor 10B forms a curved portion 12B that is curved in the same direction as the curved portion 12A on one side. Curved part 12
Three-phase load side conductors 7A, 7B and 7C penetrate through the partition plate 1A between A, 12C and 12B.

Thus, the curved portions 12A, 12C, 12
Since B is formed, the load-side conductors 7A, 7B, and 7C are provided with the curved portions 12A and 1 without increasing the width dimension of the switchboard 1.
It becomes possible to draw out to the outside of the three-phase vertical bus conductors 10A, 10B, 10C at the shortest distance while intersecting with 2B, 12C, and each load side conductor 7A, 7B, 7C is economical with little power loss. .

Three-phase vertical bus conductors 10A, 10B, 10C
Since the load-side conductors 7A, 7B, and 7C are arranged to face each other, it is possible for the worker to immediately determine whether or not the wiring is made, so that mistakes in work can be reduced. I can.

Three-phase vertical bus conductors 10A, 10B, 10
Current transformer 11 facing C and the load side conductors 7A, 7B, 7C
In the place where the electric field is severe, the shield 13 is provided to alleviate the electric field concentration. Further, the bending of the intermediate bending portion 12B can be formed smaller than the bending portions 12A and 12C, and the inter-phase distance G can be made uniform.

FIG. 3A shows the side plate 1B of the switchboard 1 as shown in FIG.
As shown in (B), the protrusion 16A is formed on the vertical busbar conductor 10 side, and the nut is tightened and fixed to the bolt penetrating between the protrusions 16A, or fixed by welding. in this case,
One projection 16A is bent to surround the other projection to form the shield 16. The shield 16 is arranged to face the vertical bus conductors 10A and 10C,
The shield 16 may be provided on the curved side of the intermediate curved portion 12. Further, when the abutting protrusions have the same length, a shield surrounding the tip of one of the protrusions may be attached, or an electric field reducing means such as coating the tip of the protrusion with an insulator may be provided.

As a result, the electric field concentration on the protrusion 16A is shown in FIG.
It is relaxed by the shield 16 as shown in (C), and the shield 1
Since the insulation distance between 6 and each of the vertical busbar conductors 10A and 10C can be reduced by the amount of relaxation of the electric field, not only can the width dimension of the switchboard be reduced, but also only the intermediate-phase vertical busbar conductor 10B can be reduced. Since it is sufficient to form the curved portion 12B that is curved on the vertical busbar conductor 10A side, the number of steps for processing the curved portion 12B can be reduced.

Further, between the curved portion 12B and the curved vertical busbar conductor 10A, the one-phase load side conductor 7A and the one-phase load side conductor 7A and the curved portion 12B on the opposite side are opposed thereto. Two-phase and three-phase load-side conductors 7B, 7C can be drawn out from the vertical busbar conductor 10C at the shortest distance.

In order to reduce the width dimension between the three-phase vertical busbar conductors, the vertical busbar conductors 10 and the load-side conductors 7 which cross each other as shown in FIGS. 3 (A), (B), and (C) are cross-sections. The conductors are formed in a round shape, and an equal electric field 20 indicating an equipotential surface is provided between the conductors, and the conductors between different phases are arranged with a narrow air insulation distance. That is, since the vertical busbar conductor 10 and the load-side conductor 7 are formed in a round shape to reduce the electric field concentration, the insulation between the three-phase vertical busbar conductor 10 and the load-side conductor 7 is reduced by the amount corresponding to the relaxation of the electric field concentration. Since the distance can be reduced, the width of the switchboard 1 can be reduced and the switchboard can be downsized.

Further, the three-phase vertical busbar conductors 10 and the load-side conductors 7 at the intersecting portions are covered with an insulating material, and are covered with an insulating material.
Since the insulation distance between the phase vertical busbar conductor and the load side conductor can be further reduced, the width dimension of the switchboard can be further reduced and the switchboard can be downsized.

Further, as shown in FIGS. 4 (A), (B), and (C), the vertical busbar conductor 10 and the load-side conductor 7 intersecting with the vertical busbar conductor 10 are formed in a rectangular shape in cross section. An equal electric field 20 indicating an equipotential surface is provided between the areas. That is, the corners of the vertical busbar conductor 10 and the load-side conductor 7 having a rectangular cross section form a circular shape so as to alleviate the electric field concentration and form a uniform electric field 20.

The above-described embodiment of the present invention shown in FIG. 2 can be applied to the conductor arrangement at the intersecting portion. That is, 3
The first conductors are arranged facing each other in the same direction with the second conductor of the phase interposed therebetween,
The first conductors of the three phases are connected to each other by busbar conductors, the busbar conductors on both sides form a curved portion so as to spread outward, and the busbar conductor of the intermediate phase forms a curved portion that curves in the same direction as one curved portion. Then, by pulling out the second conductor portion to the outside so as to intersect with each curved portion, each second conductor can be pulled out at the shortest distance.

[0021]

As described above, according to the present invention, the load-side conductor of each phase is pulled out to the outside at the shortest distance while intersecting the curved portion on the power-source side, and the power loss in each load-side conductor is reduced, which is economical. In addition to being the target, the distribution board can be downsized.

[Brief description of drawings]

FIG. 1 is a side sectional view of a switchboard shown as an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the arrangement of vertical busbar conductors and load-side conductors when the switchboard of FIG. 1 is viewed from the backside of the switchboard.

FIG. 3 is a diagram in which a round conductor having a circular cross-section is used for the vertical bus conductor and the load-side conductor shown as another embodiment of the present invention.

FIG. 4 is a view in which a conductor having a rectangular cross section is applied to a vertical bus conductor and a load-side conductor shown as another embodiment of the present invention.

[Explanation of symbols]

1 ... Switchboard, 2 ... Upper circuit breaker room, 3 ... Lower circuit breaker room, 4
... Power supply side connection part, 5 ... Load side connection part, 6 ... Bus conductor,
7, 7A, 7B, 7C ... Load side conductors, 10, 10A, 1
0B, 10C ... Vertical bus conductors, 12A, 12B, 12C ...
Curved part, 16 ... Shield, 16A ... Protrusion.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kotaro Takematsu             Co., Ltd., 120, Saiwaicho, Inazawa City, Aichi Prefecture             Within the Hitachi AI system F term (reference) 5G016 AA03 DA03 DA06 DA52                 5G365 AA03 AA06 AB03 AD02 AD06

Claims (5)

[Claims] 1. A switchboard for accommodating electrical equipment, a first circuit breaker chamber and a second circuit breaker chamber provided in the switchboard, and an electrical connection with the electrical equipment provided in each of the circuit breaker chambers. A busbar conductor that includes a first connecting portion and a second connecting portion that are separated from each other and a second conductor that is connected to the second connecting portion, and that connects the first connecting portions of the circuit breaker chambers to each other; A curved portion in which both sides of the busbar conductor are curved so as to spread outward, an intermediate curved portion in which the intermediate phase of the busbar conductor is curved to the same side as the one side of the curved portion, and the same side is curved to the same side. A conductor of a switchboard, comprising: the one-phase second conductor drawn out from between the curved portions, and the two-phase and three-phase second conductors drawn from between the curved portions curved on opposite sides. Arrangement structure. 2. A switchboard for housing electrical equipment, a first circuit breaker chamber and a second circuit breaker chamber provided in the switchboard, and an electrical connection with the electrical equipment provided in each of the circuit breaker chambers. A busbar conductor that includes a first connecting portion and a second connecting portion that are separated from each other and a second conductor that is connected to the second connecting portion, and that connects the first connecting portions of the circuit breaker chambers to each other; A protrusion protruding from the inner surface of the circuit breaker chamber in the busbar conductor direction, an electric field alleviation means for alleviating an electric field provided on the protrusion, and an intermediate phase in which an intermediate phase of the busbar conductor is curved toward the electric field alleviation means. A curved portion, a one-phase second conductor drawn out between the curved portion and the busbar conductor on the side of the electric field relaxation means, and a two-phase drawn out between the busbar conductor on the opposite side to the second conductor. And a second conductor of three phases, a conductor arrangement structure of a switchboard. 3. A pair of first conductors, which are opposed to each other with a three-phase second conductor interposed therebetween, a three-phase bus conductor connecting the first conductors to each other, and both sides of the bus conductor are spread outward. A curved portion curved in such a manner, and an intermediate curved portion in which the busbar conductor of the intermediate phase is curved to the same side as the one side of the curved portion, and one phase drawn out from between the curved portions curved to the same side. Of the second conductor, and the second conductor of the two-phase and three-phase drawn out from between the curved portions that are curved on the opposite side to each other, the extraction conductor. 4. The conductor of the switchboard according to claim 1, wherein the busbar conductor and the second conductor have a round shape so as to reduce electric field concentration. Arrangement structure or lead conductor. 5. The conductor arrangement structure of a switchboard or a lead conductor according to claim 1, wherein the busbar conductor and the second conductor are covered with an insulator.