JP4008216B2

JP4008216B2 - Conductor layout structure of switchboard

Info

Publication number: JP4008216B2
Application number: JP2001239132A
Authority: JP
Inventors: 克修駒沢; 明雄猿田; 耕太郎竹松
Original assignee: 株式会社日立アイイ−システム
Priority date: 2001-08-07
Filing date: 2001-08-07
Publication date: 2007-11-14
Anticipated expiration: 2021-08-07
Also published as: JP2003052106A

Description

【０００１】
【発明の属する技術分野】
本発明は電源側母線導体と負荷側導体との配置、及びそれ等を収納する配電盤の導体とこれに接近して配置される接地金属板の端面形状を改良した配電盤の導体配置構造及び引出導体に関する。
【０００２】
【従来の技術】
一般に配電盤内の導体配置構造は配電盤の側面の接地金属板や、盤内に設置した接地された金具に規定の沿面絶縁距離を有する支持碍子上に導体が配置され、且つ異相導体間距離や、導体と配電盤を構成する接地された金属遮蔽板との距離を気中絶縁上最も電界が集中する針−平板構造の導体や、接地金属板を想定して絶縁が絶縁破壊しない離隔寸法で構成している。
【０００３】
又、短絡電流の小さな系統では絶縁電線で全て構成している配電盤もあるが、短絡電流の大きな系統や通電電流の大きな系統の配電盤には、通電容量や短絡時の熱的、機械的な影響を考慮して導体で構成されている。
【０００４】
【発明が解決しようとする課題】
従来から交差する電源側母線導体と負荷側導体とを収納する配電盤の外形寸法を縮小化する為には、この異相間導体間寸法や、導体の対地間距離即ち接地金属間の絶縁寸法を縮小し、配電盤を小型化すること、及び負荷側導体の電力損失を少なくすること等の要望がある。尚、配電盤内の負荷側導体及び電源側母線導体の配置に関する技術として特開昭６３−１７８７０５号公報を挙げることができる。
【０００５】
本発明の目的は、電力損失を少なくすると共に、縮小化した配電盤を提供する事に有る。
【０００６】
【課題を解決するための手段】
前述の目的を達成する為に、本発明では、３相の負荷側導体と３相の電源側母線導体とを断面形状が丸型形状に形成し、これら３相の電源側母線導体と３相の負荷側導体とが交差する交差部分では、前記３相の電源側母線導体のうち両側に位置する電源側母線導体に、外側に広がるように湾曲した湾曲部を形成すると共に、前記３相の電源側母線導体のうち中間に位置する電源側母線導体に、前記両側に位置する電源側母線導体に形成した前記湾曲部の一方側と同方向に湾曲する湾曲部を形成し、前記３相の負荷側導体のうち一つを同方向に湾曲部を形成した隣接する電源側母線導体間から引出し、前記３相の負荷側導体のうち残る二つを外側に広がるように湾曲した湾曲部を形成した隣接する電源側母線導体間から引出すことを特徴とする。
【０００７】
【発明の実施の形態】
以下、本発明の実施例を図１から図３により説明する。図１において、配電盤１内には例えば第１遮断器となる上段遮断器２と第２遮断器となる下段遮断器３とを２段積に配置している。上段遮断器２及び下段遮断器３には各々３相の電源側接続部４と負荷側接続部５とが設けられている。電源側接続部４と負荷側接続部５とは、図１及び図２に示すように、配電盤１内に設けられた仕切板１Ａを貫通して３相の電源側母線導体６と負荷側導体７とに各々接続されている。
【０００８】
上段遮断器２及び下段遮断器３は、位置Ａから位置Ｂに移動することにより、電源側接続部４及び負荷側接続部５は電源側母線導体６及び負荷側導体７に電気的に接続され、位置Ｂから位置Ａに移動することで、上段遮断器２及び下段遮断器３は、電源側母線導体６及び負荷側導体７から電気的に切り離される。
【０００９】
３相の電源側母線導体６は、断面形状が丸型形状に形成され、配電盤１内の天井面に取付けられた絶縁碍子８に支持されている。そして、電源側母線導体６は、電源側縦母線導体１０（１０Ａ〜１０Ｃ）を有し、これら電源側縦母線導体１０（１０Ａ〜１０Ｃ）によって上段遮断器２及び下段遮断器３の電源側接続部４同士間を縦方向に接続している。負荷側導体７は、３相の負荷側導体７Ａ〜７Ｃを有し、前記上段遮断器２及び下段遮断器３の負荷側接続部５から前記電源側縦母線導体１０Ａ〜１０Ｃと交差するように引出され、変流器１１を介して例えばモータ、電灯等の負荷に接続されている。
【００１０】
３相の電源側縦母線導体１０Ａ〜１０Ｃのうち、両側に位置する電源側縦母線導体１０Ａ，１０Ｃに、外側に広がるように湾曲した湾曲部１２Ａ，１２Ｃを形成し、中間に位置する電源側縦母線導体１０Ｂに、前記両側に位置する電源側縦母線導体１０Ａ，１０Ｃに形成した前記湾曲部１２Ａ，１２Ｃの一方側、ここでは湾曲部１２Ａと同方向に湾曲する湾曲部１２Ｂを形成している。そして、隣接する電源側縦母線導体１０Ａ，１０Ｂの湾曲部１２Ａ，１２Ｂ間を通して負荷側導体７Ａを引出し、隣接する電源側縦母線導体１０Ｂ，１０Ｃの湾曲部１２Ｂ，１２Ｃ間を通して負荷側導体７Ｂ，７Ｃを引出している。
【００１１】
このように、電源側母線導体６（電源側縦母線導体１０Ａ〜１０Ｃを含む）と負荷側導体７（７Ａ〜７Ｃ）の断面形状を丸型形状とすることで、電界の集中を緩和することができ、さらに、電源側縦母線導体１０Ａ〜１０Ｃを湾曲させその湾曲部１２Ａ〜１２Ｃを利用して負荷側導体７Ａ〜７Ｃを引き出すようにしたので、電源側縦母線導体１０Ａ〜１０Ｃと負荷側導体７Ａ〜７Ｃとの絶縁距離は湾曲部１２Ａ〜１２Ｃによって確保できる。その結果、配電盤１の幅寸法を広くすることなく負荷側導体７Ａ〜７Ｃを最短距離で外側に引出すことができ、負荷側導体７Ａ〜７Ｃの電力損失を少なくすることができる。
【００１２】
３相の電源側縦母線導体１０Ａ〜１０Ｃと負荷側導体７Ａ〜７Ｃとは互いに対向して配置されるから、作業員が対向面を一目すれば、配線がされているか否かすぐに判断できるので、作業ミスを少なくすることが出来る。
【００１３】
又、３相の電源側縦母線導体１０Ａ〜１０Ｃと負荷側導体７Ａ〜７Ｃとに対向する変流器１１は電界の厳しい箇所では、シールド１３を設けて、電界集中を緩和している。更に湾曲部１２Ａ，１２Ｃに較べて中間の湾曲部１２Ｂの湾曲を小さくすることで、隣接する相間距離Ｇを均等に出来る。
【００１４】
図３（Ａ）は配電盤１の側面板１Ｂを図３（Ｂ）のように電源側縦母線導体１０Ａ，１０Ｃ側に突起部１６Ａを形成し、突起部１６Ａ間を貫通したボルトにナットを締付けて固定するか、或いは溶接により固定している。この場合、一方の突起部１６Ａは他方の突起部を包囲するように円形状に曲げてシールド１６を形成している。また接合する突起部１６Ａの長さが等しいときには、一方の突起部の先端を包囲するシールドを取付けたり、或いは突起部の先端を絶縁物で被覆する等の電界緩和手段を設ければ良い。
【００１５】
この結果、突起部１６Ａの電界集中は図３（Ｃ）のようにシールド１６により緩和され、シールド１６と各電源側縦母線導体１０Ａ，１０Ｃとの間の絶縁距離は電界２０が緩和された分だけ縮小できるので、配電盤の幅寸法を縮小することができるばかりか、また中間の電源側縦母線導体１０Ｂのみを電源側縦母線導体１０Ａ側に湾曲する湾曲部１２Ｂを形成すればよいから、湾曲部１２Ａ，１２Ｃを加工する工程が少なくて良い。
【００１６】
また湾曲部１２Ｂを有すると電源側縦母線導体１０Ｂと湾曲部１２Ｂ側に位置する電源側縦母線導体１０Ａとの間から一つの負荷側導体７Ａを最短距離で引出し、湾曲部１２Ｂによって間隔が広くなった電源側縦母線導体１０Ｂと電源側縦母線導体１０Ｃとの間から残る二つの負荷側導体７Ｂ，７Ｃを最短距離で引出すことができる。
【００１７】
【００１８】
また交差部の３相の電源側縦母線導体１０Ａ〜１０Ｃと負荷側導体７Ａ〜７Ｃとを絶縁物で被覆することで、電源側縦母線導体１０Ａ〜１０Ｃと負荷側導体７Ａ〜７Ｃとの間の絶縁距離を更に縮小できるので、配電盤の幅寸法を更に縮小でき、配電盤を小型化することができる。
【００１９】
【００２０】
【００２１】
【発明の効果】
以上のように、本発明によれば、各相の負荷側導体を電源側母線導体の湾曲部と交差しながら最短距離で外側に引出すことが出来るので、各負荷側導体での電力損失が少なくなって経済的であるばかりか、また配電盤を小型化することができる。
【図面の簡単な説明】
【図１】本発明の実施例として示した配電盤の側断面図。
【図２】図１の配電盤を盤裏面から見た電源側縦母線導体と負荷側導体の配置を示した断面図。
【図３】本発明の他の実施例と示した電源側縦母線導体と負荷側導体とに断面形状が円形状の丸型導体を使用した図。
【符号の説明】
１…配電盤、２…上段遮断器、３…下段遮断器、４…電源側接続部、５…負荷側接続部、６…電源側母線導体、７，７Ａ〜７Ｃ…負荷側導体、１０，１０Ａ〜１０Ｃ…電源側縦母線導体、１２Ａ〜１２Ｃ…湾曲部、１６…シールド、１６Ａ…突起部。[0001]
BACKGROUND OF THE INVENTION
DISCLOSURE OF THE INVENTION The present invention relates to a distribution board conductor arrangement structure and a lead conductor improved in the arrangement of the power source side bus conductor and the load side conductor, and the end face shape of the grounding metal plate arranged close to the conductor of the distribution board housing them About.
[0002]
[Prior art]
In general, the conductor arrangement structure in the switchboard is such that the conductor is arranged on a grounding metal plate on the side of the switchboard or a support insulator having a prescribed creepage insulation distance to a grounded metal fitting installed in the panel, and the distance between different phase conductors, The distance between the conductor and the grounded metal shielding plate that constitutes the switchboard is composed of a needle-plate structure conductor where the electric field is most concentrated in air insulation, and a separation dimension that does not cause dielectric breakdown assuming a grounded metal plate. ing.
[0003]
In addition, there are switchboards that are all composed of insulated wires in systems with small short-circuit currents, but distribution boards with systems with large short-circuit currents and systems with large energization currents have effects on the energization capacity and thermal and mechanical effects at the time of short-circuit. Is made of a conductor.
[0004]
[Problems to be solved by the invention]
In order to reduce the outer dimensions of the switchboard that houses the power-source bus conductors and load-side conductors that intersect with each other, the interphase conductor dimensions and the distance between the conductors to ground, that is, the insulation dimensions between the ground metals are reduced. However, there is a demand for reducing the size of the switchboard and reducing the power loss of the load-side conductor. JP-A-63-178705 can be cited as a technique relating to the arrangement of the load side conductor and the power source side bus conductor in the switchboard.
[0005]
An object of the present invention is to provide a switchboard that is reduced in size while reducing power loss.
[0006]
[Means for Solving the Problems]
In order to achieve the above-described object, in the present invention, a three-phase load-side conductor and a three-phase power-side bus conductor are formed in a round shape in cross section, and the three-phase power-side bus conductor and the three-phase In the intersection where the load side conductor intersects, the power supply side bus conductor located on both sides of the three phase power supply side bus conductors is formed with a curved portion that is curved to spread outward, and the three phase A bending portion that is bent in the same direction as one side of the bending portion formed in the power supply side bus conductor located on the both sides is formed in the power supply side bus conductor located in the middle of the power supply side bus conductors, One of the load side conductors is drawn out from between adjacent power supply side bus conductors having a curved portion formed in the same direction, and a curved portion is formed so that the remaining two of the three-phase load side conductors spread outward. characterized in that the pulled out between the adjacent power supply side busbar conductor
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention with reference to FIG. 1 to FIG. In FIG. 1, for example, an upper circuit breaker 2 serving as a first circuit breaker and a lower circuit breaker 3 serving as a second circuit breaker are arranged in a two-stage product in the switchboard 1. Each of the upper circuit breaker 2 and the lower circuit breaker 3 is provided with a three-phase power supply side connection portion 4 and a load side connection portion 5 . As shown in FIGS. 1 and 2, the power supply side connection portion 4 and the load side connection portion 5 pass through a partition plate 1 </ b > A provided in the switchboard 1 and have a three-phase power supply side bus conductor 6 and a load side conductor. 7 are connected to each other.
[0008]
Upper breaker 2 and the lower breaker 3 is moved in a position B from the position A, the power supply-side connecting portion 4 and the load-side connecting portion 5 is electrically connected to the power source side bus conductor 6 and the load side conductor 7 and moving to the position a from the position B, the upper circuit breaker 2 and the lower breaker 3 is electrically disconnected from the power source side bus conductor 6 and the load side conductor 7.
[0009]
The three-phase power supply side bus conductor 6 has a round cross-sectional shape and is supported by an insulator 8 attached to the ceiling surface in the switchboard 1. The power supply side bus conductor 6 has power supply side vertical bus conductors 10 (10A to 10C), and the power supply side connection of the upper circuit breaker 2 and the lower circuit breaker 3 by these power supply side vertical bus conductors 10 (10A to 10C). The parts 4 are connected in the vertical direction. Load side conductor 7 has a load-side conductor. 7A to 7 C 3 phase, so as to intersect with the power supply side vertical bus conductor 10A~10C from the load side connecting portion 5 of the upper circuit breaker 2 and the lower breaker 3 And is connected via a current transformer 11 to a load such as a motor or an electric lamp.
[0010]
Of the three-phase power source side vertical bus conductors 10A to 10C , the power source side vertical bus conductors 10A and 10C located on both sides are formed with curved portions 12A and 12C that are curved so as to spread outward, and the power source side positioned in the middle A curved portion 12B that is curved in the same direction as the curved portion 12A is formed on one side of the curved portions 12A and 12C formed on the power supply side vertical bus conductors 10A and 10C located on both sides of the vertical bus conductor 10B. Yes. Then, the load-side conductor 7A is drawn out between the curved portions 12A and 12B of the adjacent power supply side vertical bus conductors 10A and 10B, and the load side conductor 7B is passed through between the curved portions 12B and 12C of the adjacent power supply side vertical bus conductors 10B and 10C. 7C is pulled out .
[0011]
In this way, by concentrating the cross-sectional shape of the power supply side bus conductor 6 (including the power supply side vertical bus conductors 10A to 10C) and the load side conductor 7 (7A to 7C), the concentration of the electric field can be reduced. can be further since is curved the power-side vertical bus conductor 10A~10C by utilizing the curved portions 12A ~ 12C so as to draw the load side conductor 7A-7C, the power supply-side vertical bus conductor 10A~10C load side The insulation distance from the conductors 7A to 7C can be secured by the curved portions 12A to 12C. As a result, the Ku load side conductors 7A ~ 7C, such that the width dimension of the switchboard 1 Ki out to draw out side at the shortest distance, it is possible to reduce the power loss of the load-side conductor 7A-7C.
[0012]
Since the three-phase power source side vertical bus conductors 10A to 10C and the load side conductors 7A to 7C are arranged to face each other, if an operator glances at the facing surface, it can be immediately determined whether or not wiring is performed. Therefore, work mistakes can be reduced.
[0013]
In addition , the current transformer 11 facing the three-phase power source side vertical bus conductors 10A to 10C and the load side conductors 7A to 7C is provided with a shield 13 at a place where the electric field is severe to reduce electric field concentration. Further, by making the curvature of the intermediate bending portion 12B smaller than that of the bending portions 12A, 12C , the adjacent interphase distance G can be made uniform.
[0014]
3A shows that the side plate 1B of the switchboard 1 is formed with projections 16A on the power source side vertical bus conductors 10A and 10C as shown in FIG. 3B, and nuts are attached to the bolts penetrating between the projections 16A. It is fixed by tightening or by welding. In this case, the one protrusion 16A is bent into a circular shape so as to surround the other protrusion to form the shield 16 . When the length of the projecting portion 16A to be joined or are equal, or mounting a shield surrounding the tips of one of the projections, or the tip of the projection portion may be provided a field relaxation means such covering with an insulating material.
[0015]
As a result, the electric field concentration of the protrusion 16A is alleviated by the shield 16 as shown in FIG. 3C, and the insulation distance between the shield 16 and each of the power supply side vertical bus conductors 10A and 10C is the amount by which the electric field 20 is relaxed. Since only the intermediate power supply side vertical bus conductor 10B can be bent to the power supply side vertical bus conductor 10A side, it is only necessary to form the bending portion 12B. The number of steps for processing the portions 12A and 12C may be small.
[0016]
Further, when the curved portion 12B is provided, one load-side conductor 7A is drawn out in the shortest distance from between the power-source-side vertical bus conductor 10B and the power-source-side vertical bus conductor 10A located on the curved portion 12B side, and the spacing is widened by the curved portion 12B. The two load-side conductors 7B and 7C remaining from between the power-source-side vertical bus conductor 10B and the power-source-side vertical bus conductor 10C can be drawn out with the shortest distance.
[0017]
[0018]
Further, the power supply side vertical bus conductors 10A to 10C and the load side conductors 7A to 7C are covered by covering the three-phase power supply side vertical bus conductors 10A to 10C and the load side conductors 7A to 7C with an insulator . since the insulation distance between it further reduced, further can reduce the width dimension of the switchboard, the switchboard can be miniaturized.
[0019]
[0020]
[0021]
【The invention's effect】
As described above, according to the present invention, since the outside lead Succoth can in the shortest distance while crossing each phase of the load-side conductor and the curved portion of the power source side bus-bar conductor, the power loss in the load side conductor not only is less Do it economic, also the switchboard can be reduced in size.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a switchboard shown as an embodiment of the present invention.
2 is a cross-sectional view showing an arrangement of a power supply side vertical bus conductor and a load side conductor when the switchboard of FIG.
FIG. 3 is a diagram in which round conductors having a circular cross section are used for the power supply side vertical bus conductor and the load side conductor shown as another embodiment of the present invention .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Distribution board, 2 ... Upper stage circuit breaker, 3 ... Lower stage circuit breaker, 4 ... Power supply side connection part, 5 ... Load side connection part, 6 ... Power supply side bus conductor, 7, 7A - 7C ... Load side conductor, 10, 10A ~ 10C ... power supply side vertical bus conductor, 12A ~ 12C ... curved portion, 16 ... shield, 16A ... projecting portion.

Claims

A first circuit breaker and the second breaker provided in the power distribution panel, the first and the three-phase power supply side connecting unit and the load side of each provided et been Electrical the contact and separation of the second circuit breaker A connection portion, a three-phase load-side conductor connected to the load-side connection portion of the first and second circuit breakers and having a circular cross-sectional shape, and a power source side of the first and second circuit breakers A three-phase power supply side bus conductor having a circular cross-section formed by connecting the connecting portions, and spreading outward to the power supply side bus conductor located on both sides of the three phase power supply side bus conductor And forming one side of the curved portion formed on the power supply side bus conductor located on both sides of the power supply side bus conductor located in the middle of the three-phase power supply side bus conductors. A curved portion that curves in the same direction is formed, and one of the three-phase load side conductors is formed in the same direction. It is drawn out from between adjacent power supply side bus conductors, and the remaining two of the three-phase load side conductors are drawn out from between adjacent power supply side bus conductors that are curved so as to spread outward. Distribution board conductor arrangement structure.

A first circuit breaker and the second breaker provided in the power distribution panel, the first and the three-phase power supply side connecting unit and the load side of each provided et been Electrical the contact and separation of the second circuit breaker A connection portion, a three-phase load-side conductor connected to the load-side connection portion of the first and second circuit breakers and having a circular cross-sectional shape, and a power source side of the first and second circuit breakers A three-phase power source bus conductor in which the connecting portions are connected to each other and the cross-sectional shape is formed in a round shape, and an electric field relaxation means provided on a protruding portion protruding from the side plate of the switchboard to the power source bus conductor side. The power supply side bus conductor located on both sides of the three-phase power supply side bus conductor is formed with a curved portion that is curved outward and is located in the middle of the three phase power supply side bus conductor. A curved portion that curves toward the electric field relaxation means side is formed on the power source side bus conductor, and the three-phase negative conductor is formed. One of the side conductors is drawn from between adjacent power supply side bus conductors having a curved portion formed in the same direction, and a curved portion is formed so that the remaining two of the three-phase load side conductors spread outward. A conductor arrangement structure for a distribution board, wherein the conductor is drawn from between adjacent power supply side bus conductors.

The conductor arrangement structure for a switchboard according to claim 1 or 2, wherein the power supply side bus conductor and the load side conductor are covered with an insulator.