JP6520504B2

JP6520504B2 - Arc horn and switchboard

Info

Publication number: JP6520504B2
Application number: JP2015139844A
Authority: JP
Inventors: 岳浅沼
Original assignee: Fuji Electric Co Ltd
Current assignee: Fuji Electric Co Ltd
Priority date: 2015-07-13
Filing date: 2015-07-13
Publication date: 2019-05-29
Anticipated expiration: 2035-07-13
Also published as: JP2017022029A

Description

本発明は、隣接する電源導体間に発生するアークをアーク駆動経路の途中で停滞させるためのアークホーン及びそのアークホーンを備えた配電盤に関する。 The present invention relates to an arc horn for stagnating an arc generated between adjacent power conductors on the way of an arc drive path and a switchboard provided with the arc horn.

配電盤において、万一隣接する電源導体間で短絡が生じた場合、隣接する電源導体間でアークが発生する。この場合、アークに流れる電流と電源導体に流れる電流とが作る磁界によってアークは電源側とは逆方向側（負荷側）に電磁力（ローレンツ力）の影響で駆動する。その際、アークはその発生エネルギーで周囲にある電気機器などを破損・焼損させ、さらにアークが配電盤の筐体に接触した場合には、筐体が破損し、高温のガスが配電盤内から配電盤外に放出し、重大な事故となることがある。そこで、このアークを制御・鎮静させることが望まれ、配電盤において、隣接する電源導体間に発生するアークをアーク駆動経路の途中で停滞させるためにアークホーン（補助導体）を電源導体に設けることが提案されている。 In the switchboard, if a short circuit occurs between adjacent power supply conductors, an arc will occur between the adjacent power supply conductors. In this case, the arc is driven in the direction (load side) opposite to the power supply side by the influence of the electromagnetic force (Lorentz force) by the magnetic field generated by the current flowing in the arc and the current flowing in the power supply conductor. At that time, the arc causes the generated energy to damage or burn out the surrounding electric equipment etc. Furthermore, when the arc contacts the enclosure of the switchboard, the casing is damaged, and the high temperature gas is out of the switchboard from the inside of the switchboard. Release, which can result in serious accidents. Therefore, it is desirable to control and saturate this arc, and in the switchboard, to provide an arc horn (auxiliary conductor) in the power supply conductor in order to hold the arc generated between the adjacent power supply conductors in the middle of the arc drive path. Proposed.

従来のこの種のアークホーンを備えた配電盤として、例えば、特許文献１に示すものが知られている。
特許文献１に示す配電盤においては、電源からの３相の電源分岐導体のそれぞれにアークホーン（補助導体）を取り付けている。それぞれのアークホーンは、空間を介して対応配置しているとともに、それぞれの先端は電源側から負荷側に向かって傾斜している。そして、隣接する電源分岐導体間に発生したアークは、電磁力により電源側に近い１点からアークホーンの先端部に駆動されて停滞し、アークにより周囲の電気機器が破損することを回避することができる。 As a conventional switchboard provided with this kind of arc horn, what is shown, for example in patent documents 1 is known.
In the switchboard shown to patent document 1, the arc horn (auxiliary conductor) is attached to each of the three-phase power supply branch conductor from a power supply. Each of the arc horns is disposed corresponding to each other via a space, and each tip is inclined from the power supply side to the load side. Then, the arc generated between the adjacent power supply branch conductors is driven by the electromagnetic force from the one point close to the power supply side to the tip of the arc horn and stagnated, and the surrounding electric equipment is prevented from being damaged by the arc. Can.

特開平６−３８３１５号公報JP-A-6-38315

しかしながら、この従来の特許文献１に示す配電盤にあっては、以下の問題点があった。
即ち、特許文献１に示した配電盤において、アークホーンが取り付けられている電源分岐導体は断面形状が矩形の平板で構成され、アークホーンはその平板の一面に取付けられている。一方、隣接する平板状の電源導体間に発生するアークの足（陰極点、陽極点）は、その駆動に際し電界が集中する導体のエッジ部分を走行する。このため、アークの足がアークホーン取付け側の電源分岐導体のエッジ部分を走行する場合には、アークがアークホーンに導かれてその先端部で停滞する。これに対し、アークの足がアークホーン取付け側と反対側の電源分岐導体のエッジ部分を走行する場合には、アークがアークホーンに導かれず、電源分岐導体の負荷側への駆動が継続してしまい、アークにより周囲の電気機器が破損してしまうおそれがあった。 However, the switchboard shown in the conventional patent document 1 has the following problems.
That is, in the switchboard shown in Patent Document 1, the power supply branch conductor to which the arc horn is attached is constituted by a flat plate having a rectangular cross-sectional shape, and the arc horn is attached to one surface of the flat plate. On the other hand, the foot (cathode point, anode point) of the arc generated between the adjacent flat power supply conductors travels on the edge portion of the conductor where the electric field is concentrated at the time of driving. For this reason, when the foot of the arc travels the edge portion of the power supply branch conductor on the arc horn attachment side, the arc is led to the arc horn and stagnates at its tip. On the other hand, when the foot of the arc travels on the edge portion of the power branch conductor opposite to the arc horn attachment side, the arc is not led to the arc horn and the drive of the power branch conductor continues to the load side. As a result, there is a risk that the surrounding electrical equipment may be damaged by the arc.

従って、本発明はこの従来の問題点を解決するためになされたものであり、その目的は、隣接する電源導体間にアークが発生した場合に、アークの足が、アークホーン取付け側の電源導体のエッジ部分及びアークホーン取付け側と反対側の電源導体のエッジ部分のいずれを駆動する場合でも、アークをアーク発生場所に対して負荷側に取り付けたアークホーンの先端に容易、確実に導くことができるアークホーン及び配電盤を提供することにある。 Accordingly, the present invention has been made to solve this conventional problem, and its object is to provide a power conductor on the arc horn attachment side of the arc foot when an arc is generated between adjacent power conductors. When driving either the edge portion of the arc or the edge portion of the power supply conductor opposite to the arc horn attachment side, the arc can be easily and reliably led to the tip of the arc horn attached to the load side with respect to the arc generation location. It is in providing an arc horn and a switchboard which can be done.

上記目的を達成するために、本発明の一態様に係るアークホーンは、断面矩形状の平板で構成される複数の電源導体のそれぞれの一面に取り付けられる、隣接する前記電源導体間に発生するアークをアーク駆動経路の途中で停滞させるアークホーンであって、前記電源導体の一面に取り付けられる取付部と、該取付部に取り付けられた導電性のアーク駆動部とを備え、該アーク駆動部は、前記取付部から前記電源導体の一面に対して傾斜するように延びる傾斜部と、該傾斜部から延び、前記取付部を取り付ける側の前記電源導体のエッジ部分及び前記取付部を取り付ける側と反対側の前記電源導体のエッジ部分の双方を前記電源導体の両側方から覆う一対の延長部とを備えていることを要旨とする。
また、本発明の別の態様に係る配電盤は、断面矩形状の平板で構成される複数の電源導体と、該複数の電源導体のそれぞれの一面に取付けられる前述のアークホーンとを備えていることを要旨とする。 In order to achieve the above object, an arc horn according to one aspect of the present invention is an arc generated between adjacent power supply conductors attached to one surface of a plurality of power supply conductors formed of flat plates having a rectangular cross section. An arc horn for holding the light source in the middle of the arc drive path, comprising: a mounting portion attached to one surface of the power supply conductor; and a conductive arc driving portion attached to the mounting portion; An inclined portion extending from the mounting portion so as to be inclined with respect to one surface of the power supply conductor, and an edge portion of the power supply conductor on the side to which the mounting portion is attached and the side opposite to the side of attaching the mounting portion According to another aspect of the present invention, the power supply conductor further includes a pair of extensions covering both of the edge portions of the power supply conductor from both sides of the power supply conductor.
A switchboard according to another aspect of the present invention includes a plurality of power supply conductors formed of flat plates having a rectangular cross section, and the above-described arc horn attached to one surface of each of the plurality of power supply conductors. As the abstract.

本発明に係るアークホーン及び配電盤によれば、隣接する電源導体間にアークが発生した場合に、アークの足が、アークホーン取付け側の電源導体のエッジ部分及びアークホーン取付け側と反対側の電源導体のエッジ部分のいずれを駆動する場合でも、アークをアーク発生場所に対して負荷側に取り付けたアークホーンの先端に容易、確実に導くことができるアークホーン及び配電盤を提供できる。 According to the arc horn and the switchboard according to the present invention, when an arc is generated between adjacent power supply conductors, the foot of the arc is the power supply on the edge side of the power supply conductor on the arc horn mounting side and the power source on the opposite side to the arc horn mounting side In driving any of the edge portions of the conductor, it is possible to provide an arc horn and a switchboard which can lead the arc easily and reliably to the tip of the arc horn mounted on the load side with respect to the arc generation location.

本発明の第１実施形態に係るアークホーンを備えた配電盤の概略説明図である。It is a schematic explanatory drawing of the switchboard provided with the arc horn concerning 1st Embodiment of this invention. 本発明の第１実施形態に係るアークホーンの右側面図である。It is a right side view of an arc horn concerning a 1st embodiment of the present invention. 図２に示すアークホーンの正面斜め上方から見た斜視図である。FIG. 3 is a perspective view of the arc horn shown in FIG. 図２に示すアークホーンを電源導体に取り付けた状態の斜視図である。It is a perspective view of the state which attached the arc horn shown in FIG. 2 to the power supply conductor. 図２に示すアークホーンを隣接する２つの電源導体のそれぞれに取り付けたものと配電盤の筐体との位置関係を概略的に示す図である。It is a figure which shows roughly the positional relationship of what attached the arc horn shown in FIG. 2 to each of two adjacent power supply conductors, and the case of a switchboard. 図５に概略的に示された図において、アークの駆動を説明するための図である。但し、図６においては、隣接する２つの電源導体及びそれらに取り付けたアークホーンのうち片側の電源導体及びアークホーンのみを示している。FIG. 6 is a view for explaining driving of an arc in the view schematically shown in FIG. 5; However, in FIG. 6, only two power conductors adjacent to each other and the power conductor on one side of the arc horns attached thereto and the arc horn are shown. 本発明の第２実施形態に係るアークホーンの右側面図である。It is a right side view of the arc horn concerning a 2nd embodiment of the present invention. 図７に示すアークホーンの正面斜め上方から見た斜視図である。It is the perspective view seen from the front diagonally upper direction of the arc horn shown in FIG. 図７に示すアークホーンを電源導体に取り付けた状態の斜視図である。It is a perspective view of the state which attached the arc horn shown in FIG. 7 to the power supply conductor. 図７に示すアークホーンを隣接する２つの電源導体のそれぞれに取り付けたものと配電盤の筐体との位置関係を概略的に示す図である。It is a figure which shows roughly the positional relationship of what attached the arc horn shown in FIG. 7 to each of two adjacent power supply conductors, and the case of a switchboard. 図１０に概略的に示された図において、アークの駆動を説明するための図である。但し、図１１においては、隣接する２つの電源導体及びそれらに取り付けたアークホーンのうち片側の電源導体及びアークホーンのみを示している。FIG. 11 is a view for explaining driving of an arc in the view schematically shown in FIG. 10; However, FIG. 11 shows only two power conductors adjacent to each other and the power conductor on one side of the arc horns attached thereto and the arc horn. 参考例のアークホーンを電源導体に取り付けた状態の斜視図である。It is a perspective view of the state which attached the arc horn of the reference example to the power supply conductor. 図１２に示すアークホーンを隣接する２つの電源導体のそれぞれに取り付けたものと配電盤の筐体との位置関係を概略的に示す図である。It is a figure which shows roughly the positional relationship of what attached the arc horn shown in FIG. 12 to each of two adjacent power supply conductors, and the housing of a switchboard. 図１３に概略的に示された図において、アークホーンを取り付けた側の電源導体のエッジ部分をアークが駆動する場合を説明するための図である。但し、図１４においては、隣接する２つの電源導体及びそれらに取り付けたアークホーンのうち片側の電源導体及びアークホーンのみを示している。FIG. 14 is a view for describing a case where an arc drives an edge portion of the power supply conductor on the side to which the arc horn is attached in the view schematically shown in FIG. 13; However, FIG. 14 shows only two power conductors adjacent to each other and the power conductor on one side of the arc horns attached thereto and the arc horn. 図１３に概略的に示された図において、アークホーンを取り付けた側と反対側の電源導体のエッジ部分をアークが駆動する場合を説明するための図である。但し、図１５においては、隣接する２つの電源導体及びそれらに取り付けたアークホーンのうち片側の電源導体及びアークホーンのみを示している。FIG. 14 is a view for explaining a case where an arc drives an edge portion of a power supply conductor opposite to the side to which the arc horn is attached in the view schematically shown in FIG. 13; However, FIG. 15 shows only two power conductors adjacent to each other and the power conductor on one side of the arc horns attached thereto and the arc horn.

以下、本発明の実施形態について図面を参照して説明する。
（第１実施形態）
本発明の第１実施形態に係るアークホーンは、図１に示す配電盤に備えられている。配電盤１は、筐体１ａの内部に仕切板２Ａ、２Ｂを取り付けて遮断器室Ａ、母線室Ｂ、ケーブル室Ｃを備えている。母線室Ｂの天井側の仕切板２Ａには、３つの碍子４ａ，４ｂ，４ｃが取り付けられ、各碍子４ａ，４ｂ，４ｃには、３相を構成する各相の電源導体３ａ，３ｂ，３ｃが取り付けられている。そして、各相の電源導体３ａ，３ｂ，３ｃには、それぞれ電源分岐導体５が接続されている。各電源分岐導体５は、仕切板２Ａに取り付けられた各電源側断路部６に接続されている。また、仕切板２Ａには、３つの負荷側断路部８が取り付けられている。遮断器室Ａ内には、真空遮断器７が配置され、真空遮断器７は、遮断器室Ａ内で移動して各電源側断路部６及び各負荷側断路部８と電気的に開閉する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First Embodiment
The arc horn according to the first embodiment of the present invention is provided in the switchboard shown in FIG. The switchboard 1 has partition plates 2A and 2B attached to the inside of a housing 1a and is provided with a circuit breaker room A, a bus room B and a cable room C. Three insulators 4a, 4b and 4c are attached to the partition plate 2A on the ceiling side of the bus room B, and power insulators 3a, 3b and 3c of each phase constituting three phases are attached to the insulators 4a, 4b and 4c. Is attached. The power supply branch conductors 5 are connected to the power supply conductors 3a, 3b and 3c of the respective phases. Each power supply branch conductor 5 is connected to each power supply side disconnecting part 6 attached to the partition plate 2A. In addition, three load-side disconnecting portions 8 are attached to the partition plate 2A. A vacuum circuit breaker 7 is disposed in the circuit breaker room A, and the vacuum circuit breaker 7 moves in the circuit breaker room A and electrically opens / closes to each power supply side disconnecting section 6 and each load side disconnecting section 8 .

また、３つの負荷側断路部８のそれぞれには、電源導体９が接続される。３つの電源導体９は、ケーブル室Ｃ内において並行に配置されており、各電源導体９は、仕切板２Ｂに取り付けられた複数の碍子１０に取り付けられるとともに、カレントトランス１１を貫通してケーブル１２に接続される。ケーブル１２は、ケーブル室Ｃより配電盤１の外に引き出されて、例えばモータなどの負荷に接続される。ここで、各電源導体９は、負荷側断路部８から水平に延びた後、第１屈曲部９ａを経て上方に延び、更に第２屈曲部９ｂを経て筐体１ａに向かって水平に延びる。そして、各電源導体９の第１屈曲部９ａ近傍の水平部分及び第２屈曲部９ｂ近傍の水平部分には、それぞれアークホーン２０が取り付けられている。 In addition, the power supply conductor 9 is connected to each of the three load-side disconnecting portions 8. The three power supply conductors 9 are arranged in parallel in the cable chamber C, and each power supply conductor 9 is attached to a plurality of insulators 10 attached to the partition plate 2B, and penetrates the current transformer 11 to make a cable 12 Connected to The cable 12 is pulled out of the cable room C to the outside of the switchboard 1 and connected to a load such as a motor. Here, each power supply conductor 9 extends horizontally from the load-side disconnecting portion 8 and then extends upward through the first bent portion 9a and further horizontally extends toward the housing 1a through the second bent portion 9b. And the arc horn 20 is attached to the horizontal part of the 1st bending part 9a vicinity of each power supply conductor 9, and the horizontal part of the 2nd bending part 9b vicinity.

なお、各電源導体９は、アーシングスイッチ１３を介してバスバー１４を経て接地可能となっている。
ここで、各電源導体９の第１屈曲部９ａ近傍の水平部分に取り付けられたアークホーン２０と各電源導体９の第２屈曲部９ｂ近傍の水平部分に取り付けられたアークホーン２０は、構成が同一であるため、以後、各電源導体９の第２屈曲部９ｂ近傍の水平部分に取り付けられたアークホーン２０について説明する。
このアークホーン２０は、隣接する電源導体９間に発生するアークをアーク駆動経路の途中で停滞させるものであり、図４及び図５に示すように、一面（図４及び図５においては上面）９１及び一面と反対側の他面（下面）９２を有する断面矩形状の平板で構成される複数（本実施形態にあっては３つ，図４においては１つ、図５においては２つのみ図示）の電源導体９のそれぞれの一面９１に取り付けられる。 Each power supply conductor 9 can be grounded via the bus bar 14 via the grounding switch 13.
Here, the arc horn 20 attached to the horizontal portion near the first bent portion 9 a of each power supply conductor 9 and the arc horn 20 attached to the horizontal portion near the second bent portion 9 b of each power supply conductor 9 have configurations The arc horns 20 attached to the horizontal portions near the second bent portions 9b of the power supply conductors 9 will be described below because they are identical.
The arc horn 20 stagnates an arc generated between adjacent power supply conductors 9 in the middle of the arc drive path, and as shown in FIGS. 4 and 5, one surface (upper surface in FIGS. 4 and 5) A plurality of flat plates (three in the present embodiment, one in FIG. 4, one only in FIG. 5, and two only in FIG. 5) are constituted by flat plates having a rectangular cross section having one surface 91 and the other surface (lower surface) 92 opposite to one surface. Is attached to one surface 91 of each of the power supply conductors 9 shown in FIG.

各アークホーン２０は、図２乃至図４に示すように、各電源導体９の一面９１に取り付けられる取付部２１と、取付部２１に取り付けられた導電性のアーク駆動部２２とを備えている。
ここで、取付部２１は、電源導体９の幅よりもやや細い幅を有する矩形状の基板部２１ａと、基板部２１ａの短辺から延びる、基板部２１ａよりも幅の細い矩形状の狭幅板部２１ｂとを有する板部材である。取付部２１は、金属板を加工することによって一体に形成される。そして、取付部２１の基板部２１ａ及び狭幅板部２１ｂには、取付部２１を電源導体９に取り付けるための取付ボルト２７のねじ軸が挿通される複数のボルト用挿通孔２１ｄが上下に貫通するように形成されている。取付部２１は、基板部２１ａが電源側に、狭幅板部２１ｂが負荷側となるように、電源導体９の一面９１に取り付けられる。 Each of the arc horns 20, as shown in FIGS. 2 to 4, includes an attachment portion 21 attached to one surface 91 of each power supply conductor 9 and a conductive arc drive portion 22 attached to the attachment portion 21. .
Here, the mounting portion 21 has a rectangular substrate portion 21a having a width slightly smaller than the width of the power supply conductor 9, and a rectangular narrow width extending from the short side of the substrate portion 21a, which is narrower than the substrate portion 21a. It is a board member which has board part 21b. The mounting portion 21 is integrally formed by processing a metal plate. A plurality of bolt insertion holes 21d through which the screw shafts of the mounting bolts 27 for mounting the mounting portion 21 to the power supply conductor 9 are vertically penetrated through the base portion 21a and the narrow plate portion 21b of the mounting portion 21. It is formed to be. The attachment portion 21 is attached to one surface 91 of the power supply conductor 9 such that the substrate portion 21 a is on the power supply side and the narrow plate portion 21 b is on the load side.

また、アーク駆動部２２は、取付部２１から電源導体９の一面９１に対して傾斜するように延びる傾斜部２３を備えている。傾斜部２３は、取付部２１の狭幅板部２１ｂから幅方向に突出する基板部２１ａの負荷側端部において接合部２１ｃで接合されて電源導体９の一面９１、即ち取付部２１の上面に対して傾斜するように延びる。傾斜部２３の電源導体９の一面９１及び取付部２１の上面に対する傾斜は、負荷側が立ち上がるような傾斜で、その傾斜角度は、約４５°に設定されている。傾斜部２３は、矩形状の傾斜部本体２３ａと、傾斜部本体２３ａの幅方向両端から延び、取付部２１の狭幅板部２１ｂから幅方向に突出する基板部２１ａの後端部において接合部２１ｃで接合される一対の脚部２３ｂ、２３ｃとを備えている。 Further, the arc drive unit 22 includes an inclined portion 23 extending from the attachment portion 21 to the one surface 91 of the power supply conductor 9 so as to be inclined. The inclined portion 23 is joined at the load side end portion of the substrate portion 21 a protruding in the width direction from the narrow plate portion 21 b of the attachment portion 21 at the joining portion 21 c and on the one surface 91 of the power conductor 9, ie, the upper surface of the attachment portion 21. It extends to incline to the opposite side. The inclination of the inclined portion 23 with respect to the one surface 91 of the power supply conductor 9 and the upper surface of the attachment portion 21 is such that the load side rises, and the inclination angle is set to about 45 °. The inclined portion 23 extends from both ends in the width direction of the rectangular inclined portion main body 23a and the inclined portion main body 23a, and a joint portion at the rear end portion of the substrate portion 21a which protrudes in the width direction from the narrow plate portion 21b of the mounting portion 21. A pair of legs 23b and 23c joined by 21c is provided.

また、アーク駆動部２２は、傾斜部２３の一対の脚部２３ｂ、２３ｃの端部から電源導体９の一面９１に対して直交する方向（下方）に延びる一対の延長部２４、２４（図２乃至図５においては一方の延長部２４のみ図示）を備えている。これら一対の延長部２４、２４は、図４に示すように、取付部２１を取り付ける側の電源導体９のエッジ部分９１ａ及び取付部２１を取り付ける側と反対側の電源導体９のエッジ部分９２ａの双方を電源導体９の両側方から覆う。図２乃至図５に示す例においては、各電源導体９のそれぞれの両側面に、一対の延長部２４，２４を通す一対の切欠き９３が形成してあり、一対の延長部２４、２４は、取付部２１を取り付ける側の切欠き９３のエッジ部分９１ａａ及び取付部２１を取り付ける側と反対側の切欠き９３のエッジ部分９２ａａの双方を覆っている。 Further, the arc drive portion 22 is a pair of extension portions 24, 24 extending in a direction (downward) orthogonal to one surface 91 of the power supply conductor 9 from the end portions of the pair of leg portions 23b, 23c of the inclined portion 23. In FIG. 5, only one extension 24 is shown). As shown in FIG. 4, the pair of extensions 24, 24 is an edge portion 91 a of the power supply conductor 9 on the side to which the attachment portion 21 is attached and an edge portion 92 a of the power supply conductor 9 on the side opposite to the side to which the attachment portion 21 is attached. Both sides are covered from both sides of the power supply conductor 9. In the example shown in FIGS. 2 to 5, a pair of notches 93 through which the pair of extensions 24, 24 are formed is formed on both side surfaces of each power supply conductor 9, and the pair of extensions 24, 24 The edge portion 91 aa of the notch 93 on the side to which the attachment portion 21 is attached and the edge portion 92 aa of the notch 93 on the side opposite to the side on which the attachment portion 21 is attached are covered.

また、アーク駆動部２２において、一対の延長部２４、２４は、それらの端部において、取付部２１を取り付ける側と反対側の電源導体９の他面９２を覆う連結部２６で連結されている。
更に、アーク駆動部２２の傾斜部２３及び一対の延長部２４、２４の側面には、アーク１００（図６参照）を駆動するエッジ部２５が設けられている。エッジ部２５は、各延長部２４の端部（下端部）から傾斜部２３の端部（上端部）に至るまで延びている。
このように構成されたアークホーン２０を電源導体９に取り付ける際には、電源導体９の負荷側端部からアークホーン２０の連結部２６と取付部２１との間の隙間に電源導体９を挿通する形でアークホーン２０をスライドさせて１対の延長部２４、２４を切欠き９３のところに位置させ、取付ボルト２７及びナット２８により取付部２１及び電源導体９を抱き締めすればよい。この際に、取付部２１は、基板部２１ａが電源側に、狭幅板部２１ｂが負荷側となるように、電源導体９の一面９１に取り付けられる。なお、図示はしないが、電源導体９には、取付ボルト２７が挿通される貫通孔が形成されている。 Further, in the arc drive portion 22, the pair of extension portions 24, 24 are connected at their end portions by the connection portion 26 covering the other surface 92 of the power supply conductor 9 opposite to the side to which the attachment portion 21 is attached. .
Furthermore, an edge 25 for driving the arc 100 (see FIG. 6) is provided on the side surface of the inclined portion 23 and the pair of extensions 24 and 24 of the arc drive portion 22. The edge portions 25 extend from the end (lower end) of each extension 24 to the end (upper end) of the inclined portion 23.
When attaching the arc horn 20 configured in this manner to the power supply conductor 9, the power supply conductor 9 is inserted from the load-side end of the power supply conductor 9 into the gap between the connecting portion 26 and the attachment portion 21 of the arc horn 20. The arc horn 20 may be slid to position the pair of extensions 24, 24 at the notch 93, and the mounting portion 21 and the power supply conductor 9 may be held together by the mounting bolt 27 and the nut 28. At this time, the attachment portion 21 is attached to one surface 91 of the power supply conductor 9 such that the substrate portion 21 a is on the power supply side and the narrow plate portion 21 b is on the load side. Although not shown, the power supply conductor 9 is formed with a through hole through which the mounting bolt 27 is inserted.

次に、図６を参照して、電源導体９に取り付けたアークホーン２０の作用について説明する。
配電盤１において、万一隣接する電源導体９間で短絡が生じた場合、隣接する電源導体９間でアーク１００が発生する。この場合、アーク１００に流れる電流と電源導体９に流れる電流とが作る磁界によってアーク１００は電源側とは逆方向側（負荷側）に電磁力（ローレンツ力）の影響で駆動する。
ここで、アーク１００が取付部２１を取り付ける側と反対側の電源導体９のエッジ部分９２ａを駆動する場合、アーク１００の足（陽極点、陰極点）は、電源導体９の電源側のエッジ部分９２ａから切欠き９３のエッジ部分９２ａａを経てアークホーン２０の延長部２４、傾斜部２３のアーク駆動経路Ａを駆動して傾斜部２３の先端に至り、アーク１００の足が傾斜部２３の先端一端部２３Ａに固定される。そして、アーク１００は徐々に先端一端部２３Ａと反対側の傾斜部２３の先端他端部２３Ｂ側に広がっていき、その足が先端他端部２３Ｂに固定される。このため、アーク１００は筐体１ａに接触せず、筐体１ａが破損して高温のガスが配電盤１内から配電盤１外に放出するおそれを回避することができる。なお、アークホーン２０の電源導体９に対する取付位置は、アーク１００が広がっても、筐体１ａに到達しない位置に設定されている。 Next, the operation of the arc horn 20 attached to the power supply conductor 9 will be described with reference to FIG.
In the switchboard 1, if a short circuit occurs between adjacent power supply conductors 9, an arc 100 is generated between the adjacent power supply conductors 9. In this case, the arc 100 is driven to the side (load side) opposite to the power supply side by the influence of the electromagnetic force (Lorentz force) by the magnetic field generated by the current flowing to the arc 100 and the current flowing to the power supply conductor 9.
Here, when the arc 100 drives the edge portion 92a of the power supply conductor 9 opposite to the side to which the attachment portion 21 is attached, the foot (anode point, cathode point) of the arc 100 is the edge portion of the power supply conductor 9 on the power supply side. From 92a through the edge portion 92aa of the notch 93, the arc drive path A of the extension 24 of the arc horn 20 and the slope 23 is driven to reach the tip of the slope 23 and the foot of the arc 100 reaches one end of the tip of the slope 23 It is fixed to the part 23A. Then, the arc 100 gradually spreads toward the other end 23B of the inclined portion 23 opposite to the one end 23A, and the foot is fixed to the other end 23B. For this reason, the arc 100 does not contact the housing 1a, and the possibility that the housing 1a is damaged and the high temperature gas is released from the inside of the switchboard 1 to the outside of the switchboard 1 can be avoided. The mounting position of the arc horn 20 with respect to the power supply conductor 9 is set at a position not reaching the housing 1 a even if the arc 100 spreads.

一方、アーク１００が取付部２１を取り付ける側の電源導体９のエッジ部分９１ａを駆動する場合、図示はしないが、アーク１００の足は、電源導体９の電源側のエッジ部分９１ａから切欠き９３のエッジ部分９１ａａを経てアークホーン２０の延長部２４、傾斜部２３のアーク駆動経路を駆動して傾斜部２３の先端に至り、アーク１００の足が傾斜部２３の先端一端部２３Ａに固定される。そして、アーク１００は徐々に先端一端部２３Ａと反対側の傾斜部２３の先端他端部２３Ｂ側に広がっていき、その足が先端他端部２３Ｂに固定される。このため、アーク１００は筐体１ａに接触しない。 On the other hand, when the arc 100 drives the edge portion 91a of the power supply conductor 9 on the side to which the attachment portion 21 is attached, although not shown, the foot of the arc 100 is notched from the edge portion 91a on the power supply side of the power supply conductor 9 The arc drive path of the extension portion 24 of the arc horn 20 and the inclined portion 23 is driven through the edge portion 91 aa to reach the tip end of the inclined portion 23, and the foot of the arc 100 is fixed to the tip end portion 23 A of the inclined portion 23. Then, the arc 100 gradually spreads toward the other end 23B of the inclined portion 23 opposite to the one end 23A, and the foot is fixed to the other end 23B. For this reason, the arc 100 does not contact the housing 1a.

このように、第１実施形態に係るアークホーン２０によれば、アーク駆動部２２は、取付部２１から電源導体９の一面９１に対して傾斜するように延びる傾斜部２３と、傾斜部２３から延び、取付部２１を取り付ける側の電源導体９のエッジ部分９１ａ（９１ａａ）及び取付部２１を取り付ける側と反対側の電源導体９のエッジ部分９２ａ（９２ａａ）の双方を電源導体９の両側方から覆う一対の延長部２４、２４とを備えている。このため、隣接する電源導体９間にアーク１００が発生した場合に、アーク１００の足が、アークホーン２０を取り付ける側の電源導体９のエッジ部分９１ａ及びアークホーン２０を取り付ける側と反対側の電源導体９のエッジ部分９２ａのいずれを駆動する場合でも、アークホーン２０の延長部２４から傾斜部２３を駆動し、傾斜部２３の先端に至るので、アーク１００をアーク発生場所に対して負荷側に取り付けたアークホーン２０の先端に容易、確実に導くことができ、アーク１００が筐体１ａに接触せず、筐体１ａが破損して高温のガスが配電盤１内から配電盤１外に放出するおそれを回避することができる。 As described above, according to the arc horn 20 according to the first embodiment, the arc driving unit 22 extends from the mounting portion 21 to the inclined surface 23 with respect to the one surface 91 of the power supply conductor 9, and Both the edge portion 91a (91aa) of the power supply conductor 9 on the side to which the mounting portion 21 is attached and the edge portion 92a (92aa) of the power supply conductor 9 on the opposite side to the side to which the mounting portion 21 is attached A pair of coverings 24, 24 are provided. Therefore, when the arc 100 is generated between the adjacent power supply conductors 9, the foot of the arc 100 is the power supply on the side opposite to the side to which the edge portion 91a of the power supply conductor 9 to which the arc horn 20 is attached and the arc horn 20 attached. In driving any of the edge portions 92 a of the conductor 9, the inclined portion 23 is driven from the extension 24 of the arc horn 20 and reaches the tip of the inclined portion 23, so the arc 100 is on the load side with respect to the arc generation location It can be easily and reliably led to the tip of the attached arc horn 20, and the arc 100 does not contact the housing 1a, and the housing 1a may be damaged and high temperature gas may be released from the inside of the switchboard 1 to the outside of the switchboard 1 Can be avoided.

また、第１実施形態に係るアークホーン２０によれば、一対の延長部２４、２４は、取付部２１を取り付ける側と反対側の電源導体９の他面９２を覆う連結部２６で連結されている。このため、電源導体９の他面９２側をアーク１００の足が駆動する場合でも、アーク１００の足は、連結部２６から延長部２４、傾斜部２３を駆動し、傾斜部２３の先端に至るので、アーク１００をアークホーン２０の先端に容易、確実に導くことができる。
更に、第１実施形態に係るアークホーン２０によれば、アーク駆動部２２の傾斜部２３及び一対の延長部２４、２４の側面に、アーク１００を駆動するエッジ部２５を設けてある。このため、アーク１００の足が、アークホーン２０の延長部２４から傾斜部２３を駆動して傾斜部２３の先端に至る際に、アーク１００の足はエッジ部２５上を駆動する。これにより、アーク１００をアークホーン２０の先端により容易に導くことができる。 Further, according to the arc horn 20 according to the first embodiment, the pair of extension portions 24 are connected by the connecting portion 26 covering the other surface 92 of the power supply conductor 9 opposite to the side to which the mounting portion 21 is attached. There is. Therefore, even when the foot of the arc 100 drives the other surface 92 of the power supply conductor 9, the foot of the arc 100 drives the extension 24 and the inclined portion 23 from the connecting portion 26 to reach the tip of the inclined portion 23. Thus, the arc 100 can be easily and reliably guided to the tip of the arc horn 20.
Furthermore, according to the arc horn 20 according to the first embodiment, the edge portion 25 for driving the arc 100 is provided on the side surface of the inclined portion 23 and the pair of extension portions 24 of the arc drive unit 22. Therefore, when the foot of the arc 100 drives the inclined portion 23 from the extension 24 of the arc horn 20 to reach the tip of the inclined portion 23, the foot of the arc 100 drives on the edge 25. Thus, the arc 100 can be easily guided to the tip of the arc horn 20.

また、第１実施形態に係るアークホーン２０を備えた配電盤１によれば、複数（この実施形態の場合３つ）の電源導体９のそれぞれの両側面に、一対の延長部２４、２４を通す一対の切欠き９３、９３を形成してある。この理由は、切欠き９３を形成しないストレート形状の電源導体９の両側面から一対の延長部２４、２４でエッジ部分９１ａ及び９２ａを覆った場合には、隣接して並行に配置された電源導体９に取り付けたアークホーン２０の延長部２４との間の距離が短くなり、極間の耐電圧が低下する懸念がある。このため、アークホーン２０の延長部２４を設置する付近の電源導体９に延長部２４用の逃げとなる切欠き９３を形成した。これにより、極間の絶縁距離を維持することが可能となり、耐電圧の低下を防止することができる。このように、切欠き９３を電源導体９に形成すると、その部分の電源導体９の断面積が小さくなり、電流集中により発熱する危険性が心配される。しかし、アークホーン２０の延長部２４を含めた部分も導体として使用することができるので、アークホーン２０の断面積と切欠き９３があるところの電源導体９の断面積の合計がストレート形状の電源導体９の断面積よりも多ければ、電流集中を防止することができる。 In addition, according to the switchboard 1 including the arc horn 20 according to the first embodiment, the pair of extension portions 24 is passed through both side surfaces of each of the plurality (three in the case of this embodiment) power conductors 9. A pair of notches 93, 93 are formed. The reason is that when the edge portions 91 a and 92 a are covered with the pair of extensions 24, 24 from both side surfaces of the straight shaped power conductor 9 which does not form the notch 93, the power conductors arranged adjacent and in parallel There is a concern that the distance between the arc horn 20 and the extension 24 of the arc horn 20 attached may be shortened, and the withstand voltage between the poles may be reduced. Therefore, a notch 93 which is a relief for the extension 24 is formed in the power supply conductor 9 in the vicinity where the extension 24 of the arc horn 20 is to be installed. As a result, the insulation distance between the electrodes can be maintained, and a reduction in withstand voltage can be prevented. As described above, when the notches 93 are formed in the power supply conductor 9, the cross-sectional area of the power supply conductor 9 in that portion is reduced, and there is a concern that heat may be generated due to current concentration. However, since the portion including the extension 24 of the arc horn 20 can also be used as a conductor, the total cross-sectional area of the arc horn 20 and the cross-sectional area of the power conductor 9 where the notch 93 is present is a straight power source If it is larger than the cross-sectional area of the conductor 9, current concentration can be prevented.

次に、アークホーン２０に一対の延長部２４、２４を設けない参考例について図１２乃至図１５を参照して説明する。図１２乃至図１５において、図２乃至図６と同一の部材については同一の符号を付し、その説明を省略することがある。
図１２乃至図１５に示すアークホーン２０は、図２乃至図６に示すアークホーン２０と同様に、各電源導体９の一面９１に取り付けられる取付部２１と、取付部２１に取り付けられたアーク駆動部２２とを備えている。このアークホーン２０は、導電性金属板を加工することにより一体に形成されている。 Next, a reference example in which the arc horn 20 is not provided with the pair of extensions 24 will be described with reference to FIGS. 12 to 15. 12 to 15, the same members as in FIGS. 2 to 6 are denoted by the same reference numerals, and the description thereof may be omitted.
The arc horn 20 shown in FIGS. 12 to 15 has an attachment portion 21 attached to one surface 91 of each power supply conductor 9 and an arc drive attached to the attachment portion 21 similarly to the arc horn 20 shown in FIGS. And a unit 22. The arc horn 20 is integrally formed by processing a conductive metal plate.

ここで、取付部２１は、電源導体９の幅とほぼ同一の幅を有する矩形状に形成された板部材であり、取付部２１を電源導体９に取り付けるための取付ボルト２７のねじ軸が挿通される複数のボルト用挿通孔（図示せず）が上下に貫通するように形成されている。アークホーン２０を電源導体９の一面９１に取り付ける際には、取付部２１を電源導体９の一面９１上に載置し、複数の取付ボルト２７及びナット２８により取付部２１及び電源導体９を抱き締めすればよい。なお、図示はしないが、電源導体９には、取付ボルト２７が挿通される貫通孔が形成されている。 Here, the mounting portion 21 is a rectangular plate member having a width substantially the same as the width of the power supply conductor 9, and the screw shaft of the mounting bolt 27 for mounting the mounting portion 21 to the power supply conductor 9 is inserted A plurality of bolt insertion holes (not shown) are formed to penetrate vertically. When attaching the arc horn 20 to one surface 91 of the power supply conductor 9, the mounting portion 21 is placed on one surface 91 of the power supply conductor 9, and the mounting portion 21 and the power supply conductor 9 are held together by a plurality of mounting bolts 27 and nuts 28. do it. Although not shown, the power supply conductor 9 is formed with a through hole through which the mounting bolt 27 is inserted.

また、アーク駆動部２２は、取付部２１から電源導体９の一面９１に対して傾斜するように延びる傾斜部２３を備えている。傾斜部２３は、略矩形状の板部材で取付部２１と一体に形成されている。そして、傾斜部２３の電源導体９の一面９１及び取付部２１の上面に対する傾斜は、負荷側が立ち上がるような傾斜で、その傾斜角度は、約４５°に設定されている。アーク駆動部２２には、第１実施形態のアークホーン２０のように、一対の延長部は設けられていない。
このように構成された参考例のアークホーン２０の作用について、図１４及び図１５を参照して説明する。 Further, the arc drive unit 22 includes an inclined portion 23 extending from the attachment portion 21 to the one surface 91 of the power supply conductor 9 so as to be inclined. The inclined portion 23 is formed integrally with the mounting portion 21 by a substantially rectangular plate member. And the inclination with respect to the one surface 91 of the power supply conductor 9 of the inclination part 23 and the upper surface of the attaching part 21 is an inclination that a load side rises, The inclination angle is set to about 45 degrees. The arc drive unit 22 is not provided with a pair of extension parts like the arc horn 20 of the first embodiment.
The operation of the arc horn 20 of the reference example configured as described above will be described with reference to FIGS. 14 and 15.

先ず、図１４に示すように、アーク１００が取付部２１を取り付ける側の電源導体９のエッジ部分９１ａを駆動する場合、アーク１００の足は、電源導体９の電源側のエッジ部分９１ａからアークホーン２０の取付部２１の上側エッジ部分を経てアークホーン２０の傾斜部２３の上側エッジ部分のアーク駆動経路Ａを駆動して傾斜部２３の先端に至り、アーク１００の足が傾斜部２３の先端一端部２３Ａに固定される。そして、アーク１００は徐々に先端一端部２３Ａと反対側の傾斜部２３の先端他端部２３Ｂ側に広がっていき、その足が先端他端部２３Ｂに固定される。このため、アーク１００は筐体１ａに接触しない。 First, as shown in FIG. 14, when the arc 100 drives the edge portion 91 a of the power supply conductor 9 on the side to which the attachment portion 21 is attached, the foot of the arc 100 is the arc horn from the edge portion 91 a on the power supply side of the power supply conductor 9. 20 drive the arc driving path A of the upper edge portion of the inclined portion 23 of the arc horn 20 through the upper edge portion of the mounting portion 21 to reach the tip of the inclined portion 23 and the foot of the arc 100 reaches the tip end of the inclined portion 23 It is fixed to the part 23A. Then, the arc 100 gradually spreads toward the other end 23B of the inclined portion 23 opposite to the one end 23A, and the foot is fixed to the other end 23B. For this reason, the arc 100 does not contact the housing 1a.

一方、図１５に示すように、アーク１００が取付部２１を取り付ける側と反対側の電源導体９のエッジ部分９２ａを駆動する場合、アーク１００の足は、電源導体９の電源側のエッジ部分９２ａから電源導体９の負荷側のエッジ部分９２ａの端部に至るアーク駆動経路Ｂを駆動し、アーク１００の足が電源導体９の先端一端部９Ａに固定される。そして、アーク１００は徐々に先端一端部９Ａと反対側の電源導体９の先端他端部２３Ｂ側に広がっていき、その足が先端他端部２３Ｂに固定される。この際に、アーク１００は筐体１ａに接触し、筐体１ａが破損して高温のガスが配電盤１内から配電盤１外に放出する。 On the other hand, as shown in FIG. 15, when the arc 100 drives the edge portion 92a of the power supply conductor 9 opposite to the side to which the attachment portion 21 is attached, the foot of the arc 100 is the edge portion 92a of the power supply conductor 9 on the power supply side. The arc drive path B is driven to the end of the load-side edge portion 92 a of the power supply conductor 9, and the foot of the arc 100 is fixed to the tip end 9 A of the power supply conductor 9. Then, the arc 100 gradually spreads toward the other end 23B of the end of the power supply conductor 9 opposite to the one end 9A, and its foot is fixed to the other end 23B. At this time, the arc 100 contacts the housing 1 a, and the housing 1 a is broken so that the high temperature gas is discharged from the inside of the switchboard 1 to the outside of the switchboard 1.

このように、アークホーン２０に一対の延長部２４、２４を設けない参考例のアークホーン２０の場合は、アーク１００が取付部２１を取り付ける側と反対側の電源導体９のエッジ部分９２ａを駆動する場合には、アークホーン２０にアーク１００が導かれず、アーク１００の電源導体９における駆動が継続し、筐体１ａに接触してしまう不都合がある。
これに対して、第１実施形態に係るアークホーン２０の場合には、前述したように、アーク駆動部２２は、取付部２１から電源導体９の一面９１に対して傾斜するように延びる傾斜部２３と、傾斜部２３から延び、取付部２１を取り付ける側の電源導体９のエッジ部分９１ａ（９１ａａ）及び取付部２１を取り付ける側と反対側の電源導体９のエッジ部分９２ａ（９２ａａ）の双方を電源導体９の両側方から覆う一対の延長部２４、２４とを備えている。このため、隣接する電源導体９間にアーク１００が発生した場合に、アーク１００の足が、アークホーン２０を取り付ける側の電源導体９のエッジ部分９１ａ及びアークホーン２０を取り付ける側と反対側の電源導体９のエッジ部分９２ａのいずれを駆動する場合でも、アークホーン２０の延長部２４から傾斜部２３を駆動し、傾斜部２３の先端に至るので、アーク１００をアーク発生場所に対して負荷側に取り付けたアークホーン２０の先端に容易、確実に導くことができる。 Thus, in the case of the arc horn 20 of the reference example in which the pair of extensions 24, 24 are not provided in the arc horn 20, the arc 100 drives the edge portion 92a of the power supply conductor 9 opposite to the side to which the mounting portion 21 is attached. In this case, the arc 100 is not guided to the arc horn 20, and the drive of the power conductor 9 of the arc 100 continues, and there is a disadvantage that the housing 1a is in contact.
On the other hand, in the case of the arc horn 20 according to the first embodiment, as described above, the arc drive portion 22 extends from the attachment portion 21 to the surface 91 of the power supply conductor 9 so as to be inclined. 23 and both the edge portion 91a (91aa) of the power supply conductor 9 extending from the inclined portion 23 to which the attachment portion 21 is attached and the edge portion 92a (92aa) of the power supply conductor 9 opposite to the side to which the attachment portion 21 is attached A pair of extensions 24, 24 covering from both sides of the power supply conductor 9 are provided. Therefore, when the arc 100 is generated between the adjacent power supply conductors 9, the foot of the arc 100 is the power supply on the side opposite to the side to which the edge portion 91a of the power supply conductor 9 to which the arc horn 20 is attached and the arc horn 20 attached. In driving any of the edge portions 92 a of the conductor 9, the inclined portion 23 is driven from the extension 24 of the arc horn 20 and reaches the tip of the inclined portion 23, so the arc 100 is on the load side with respect to the arc generation location It can be easily and reliably guided to the tip of the attached arc horn 20.

（第２実施形態）
次に、本発明の第２実施形態に係るアークホーンについて、図７乃至図１１を参照して説明する。図７乃至図１１において、図２乃至図６における部材と同一の部材については同一の符号を付し、その説明を省略することがある。
第２実施形態に係るアークホーンは、図７乃至図１１に示されており、このアークホーン２０は、基本構成は図２乃至図６に示すアークホーン２０と同様であるが、一対の延長部２４、２４のそれぞれの形状が異なっている。なお、この第２実施形態に係るアークホーン２０も、図１に示す配電盤１において、各電源導体９の第１屈曲部９ａ近傍の水平部分及び各電源導体９の第２屈曲部９ｂ近傍の水平部分に取り付けられる。 Second Embodiment
Next, an arc horn according to a second embodiment of the present invention will be described with reference to FIG. 7 to FIG. 7 to 11, the same members as those in FIGS. 2 to 6 are denoted by the same reference numerals, and the description thereof may be omitted.
The arc horn according to the second embodiment is shown in FIGS. 7 to 11. The basic construction of the arc horn 20 is the same as that of the arc horn 20 shown in FIGS. 2 to 6, but a pair of extension portions The shape of each of 24, 24 is different. The arc horn 20 according to the second embodiment is also horizontal in the vicinity of the first bent portion 9a of each power supply conductor 9 and in the vicinity of the second bent portion 9b of each power supply conductor 9 in the switchboard 1 shown in FIG. It is attached to the part.

各延長部２４は、第１実施形態に係るアークホーン２０の延長部２４が傾斜部２３の一対の脚部２３ｂ、２３ｃの端部のそれぞれから電源導体９の一面９１に対して直交する方向（下方）に延びるのに対し、傾斜部２３の一対の脚部２３ｂ、２３ｃの端部のそれぞれから真っ直ぐに延びている点で相違している。そして、一対の延長部２４は、図９に示すように、取付部２１を取り付ける側の電源導体９のエッジ部分９１ａ及び取付部２１を取り付ける側と反対側の電源導体９のエッジ部分９２ａの双方を電源導体９の両側方から覆う。図７乃至図１１に示す例においては、各電源導体９のそれぞれの両側面に、一対の延長部２４，２４を通す一対の切欠き９３が形成してあり、一対の延長部２４、２４は、取付部２１を取り付ける側の切欠き９３のエッジ部分９１ａａ及び取付部２１を取り付ける側と反対側の切欠き９３のエッジ部分９２ａａの双方を覆っている。 In each extension portion 24, a direction in which the extension portion 24 of the arc horn 20 according to the first embodiment is orthogonal to one surface 91 of the power supply conductor 9 from each of the end portions of the pair of leg portions 23b and 23c of the inclined portion 23 It differs in that it extends straight from each of the ends of the pair of legs 23b and 23c of the inclined portion 23 while it extends downward). Then, as shown in FIG. 9, the pair of extension portions 24 are both the edge portion 91a of the power supply conductor 9 on the side to which the attachment portion 21 is attached and the edge portion 92a of the power supply conductor 9 on the side opposite to the side to which the attachment portion 21 is attached. Are covered from both sides of the power supply conductor 9. In the example shown in FIGS. 7 to 11, a pair of notches 93 through which the pair of extensions 24 are passed is formed on each of the side surfaces of each power supply conductor 9, and the pair of extensions 24 is The edge portion 91 aa of the notch 93 on the side to which the attachment portion 21 is attached and the edge portion 92 aa of the notch 93 on the side opposite to the side on which the attachment portion 21 is attached are covered.

なお、第２実施形態に係るアークホーン２０のアーク駆動部２２において、一対の延長部２４、２４は、第１実施形態に係るアークホーン２０の一対の延長部２４、２４と異なり、それらの端部において、取付部２１を取り付ける側と反対側の電源導体９の他面９２を覆う連結部２６で連結されていない。
また、第２実施形態に係るアークホーン２０のアーク駆動部２２の傾斜部２３及び一対の延長部２４、２４の側面には、第１実施形態に係るアークホーン２０と同様に、アーク１００（図１１参照）を駆動するエッジ部２５が設けられている。エッジ部２５は、各延長部２４の端部（下端部）から傾斜部２３の端部（上端部）に至るまで延びている。
このように構成されたアークホーン２０を電源導体９に取り付ける際には、電源導体９の一面９１上に取付部２１を、両延長部２４が電源導体９の両切欠き９３を通るように、載置する。そして、取付ボルト２７及びナット２８により取付部２１及び電源導体９を抱き締めすればよい。この際に、取付部２１は、基板部２１ａが電源側に、狭幅板部２１ｂが負荷側となるように、電源導体９の一面９１に取り付けられる。なお、図示はしないが、電源導体９には、取付ボルト２７が挿通される貫通孔が形成されている。 In the arc drive unit 22 of the arc horn 20 according to the second embodiment, the pair of extensions 24, 24 is different from the pair of extensions 24, 24 of the arc horn 20 according to the first embodiment, and their ends In the portion, the connection portion 26 covering the other surface 92 of the power supply conductor 9 on the side opposite to the side to which the attachment portion 21 is attached is not connected.
Further, the side surfaces of the inclined portion 23 and the pair of extension portions 24, 24 of the arc drive unit 22 of the arc horn 20 according to the second embodiment, as in the arc horn 20 according to the first embodiment, 11) is provided. The edge portions 25 extend from the end (lower end) of each extension 24 to the end (upper end) of the inclined portion 23.
When attaching the arc horn 20 configured in this manner to the power supply conductor 9, the mounting portion 21 is provided on one surface 91 of the power supply conductor 9, and the two extension portions 24 pass through the two notches 93 of the power supply conductor 9. Place it. Then, the mounting portion 21 and the power supply conductor 9 may be held together by the mounting bolt 27 and the nut 28. At this time, the attachment portion 21 is attached to one surface 91 of the power supply conductor 9 such that the substrate portion 21 a is on the power supply side and the narrow plate portion 21 b is on the load side. Although not shown, the power supply conductor 9 is formed with a through hole through which the mounting bolt 27 is inserted.

次に、図１１を参照して、電源導体９に取り付けた第２実施形態に係るアークホーン２０の作用について説明する。
配電盤１において、万一隣接する電源導体９間で短絡が生じた場合、隣接する電源導体９間でアーク１００が発生する。この場合、アーク１００に流れる電流と電源導体９に流れる電流とが作る磁界によってアーク１００は電源側とは逆方向側（負荷側）に電磁力（ローレンツ力）の影響で駆動する。
ここで、アーク１００が取付部２１を取り付ける側と反対側の電源導体９のエッジ部分９２ａを駆動する場合、図１１に示すように、アーク１００の足（陽極点、陰極点）は、電源導体９の電源側のエッジ部分９２ａから切欠き９３のエッジ部分９２ａａを経てアークホーン２０の延長部２４、傾斜部２３のアーク駆動経路Ａを駆動して傾斜部２３の先端に至り、アーク１００の足が傾斜部２３の先端一端部２３Ａに固定される。そして、アーク１００は徐々に先端一端部２３Ａと反対側の傾斜部２３の先端他端部２３Ｂ側に広がっていき、その足が先端他端部２３Ｂに固定される。このため、アーク１００は筐体１ａに接触せず、筐体１ａが破損して高温のガスが配電盤１内から配電盤１外に放出するおそれを回避することができる。なお、アークホーン２０の電源導体９に対する取付位置は、アーク１００が広がっても、筐体１ａに到達しない位置に設定されている。 Next, with reference to FIG. 11, the operation of the arc horn 20 according to the second embodiment attached to the power supply conductor 9 will be described.
In the switchboard 1, if a short circuit occurs between adjacent power supply conductors 9, an arc 100 is generated between the adjacent power supply conductors 9. In this case, the arc 100 is driven to the side (load side) opposite to the power supply side by the influence of the electromagnetic force (Lorentz force) by the magnetic field generated by the current flowing to the arc 100 and the current flowing to the power supply conductor 9.
Here, when the arc 100 drives the edge portion 92a of the power supply conductor 9 opposite to the side to which the attachment portion 21 is attached, as shown in FIG. 11, the foot of the arc 100 (anode point, cathode point) 9. Drive the arc drive path A of the extension 24 of the arc horn 20 and the inclined portion 23 from the edge portion 92a on the power supply side of 9 through the edge portion 92aa of the notch 93 to reach the tip of the inclined portion 23, and the foot of the arc 100 Are fixed to the tip end portion 23A of the inclined portion 23. Then, the arc 100 gradually spreads toward the other end 23B of the inclined portion 23 opposite to the one end 23A, and the foot is fixed to the other end 23B. For this reason, the arc 100 does not contact the housing 1a, and the possibility that the housing 1a is damaged and the high temperature gas is released from the inside of the switchboard 1 to the outside of the switchboard 1 can be avoided. The mounting position of the arc horn 20 with respect to the power supply conductor 9 is set at a position not reaching the housing 1 a even if the arc 100 spreads.

このように、第２実施形態に係るアークホーン２０においても、アーク駆動部２２は、取付部２１から電源導体９の一面９１に対して傾斜するように延びる傾斜部２３と、傾斜部２３から延び、取付部２１を取り付ける側の電源導体９のエッジ部分９１ａ（９１ａａ）及び取付部２１を取り付ける側と反対側の電源導体９のエッジ部分９２ａ（９２ａａ）の双方を電源導体９の両側方から覆う一対の延長部２４、２４とを備えている。このため、隣接する電源導体９間にアーク１００が発生した場合に、アーク１００の足が、アークホーン２０を取り付ける側の電源導体９のエッジ部分９１ａ及びアークホーン２０を取り付ける側と反対側の電源導体９のエッジ部分９２ａのいずれを駆動する場合でも、アークホーン２０の延長部２４から傾斜部２３を駆動し、傾斜部２３の先端に至るので、アーク１００をアーク発生場所に対して負荷側に取り付けたアークホーン２０の先端に容易、確実に導くことができ、アーク１００が筐体１ａに接触せず、筐体１ａが破損して高温のガスが配電盤１内から配電盤１外に放出するおそれを回避することができる。 As described above, also in the arc horn 20 according to the second embodiment, the arc drive portion 22 extends from the inclined portion 23 and the inclined portion 23 extending from the attachment portion 21 to the one surface 91 of the power supply conductor 9. Cover both the edge portion 91a (91aa) of the power supply conductor 9 on the side to which the mounting portion 21 is attached and the edge portion 92a (92aa) of the power supply conductor 9 on the opposite side to the side on which the mounting portion 21 is attached A pair of extensions 24, 24 are provided. Therefore, when the arc 100 is generated between the adjacent power supply conductors 9, the foot of the arc 100 is the power supply on the side opposite to the side to which the edge portion 91a of the power supply conductor 9 to which the arc horn 20 is attached and the arc horn 20 attached. In driving any of the edge portions 92 a of the conductor 9, the inclined portion 23 is driven from the extension 24 of the arc horn 20 and reaches the tip of the inclined portion 23, so the arc 100 is on the load side with respect to the arc generation location It can be easily and reliably led to the tip of the attached arc horn 20, and the arc 100 does not contact the housing 1a, and the housing 1a may be damaged and high temperature gas may be released from the inside of the switchboard 1 to the outside of the switchboard 1 Can be avoided.

また、第２実施形態に係るアークホーン２０によれば、一対の延長部２４、２４は、傾斜部２３の一対の脚部２３ｂ、２３ｃの端部のそれぞれから真っ直ぐに延びている。つまり、各延長部２４自身も負荷側が上となるように電源導体９の一面９１に対して傾斜している。このため、アーク１００の足が、アークホーン２０を取り付ける側の電源導体９のエッジ部分９１ａ及びアークホーン２０を取り付ける側と反対側の電源導体９のエッジ部分９２ａのいずれを駆動する場合でも、延長部２４に乗りやすく、アーク１００の足を傾斜部２３の先端に至るまで容易に駆動することができる。 Moreover, according to the arc horn 20 which concerns on 2nd Embodiment, a pair of extension part 24 and 24 is extended straight from each of the edge part of a pair of leg part 23b of the inclination part 23, and 23c. That is, each extension 24 itself is also inclined with respect to the one surface 91 of the power supply conductor 9 so that the load side is up. Therefore, even when the foot of the arc 100 drives any of the edge portion 91a of the power supply conductor 9 on the side to which the arc horn 20 is attached and the edge portion 92a of the power supply conductor 9 on the side opposite to the side to which the arc horn 20 is attached It is easy to ride on the portion 24 and the foot of the arc 100 can be easily driven to the tip of the inclined portion 23.

また、第２実施形態に係るアークホーン２０においても、アーク駆動部２２の傾斜部２３及び一対の延長部２４、２４の側面に、アーク１００を駆動するエッジ部２５を設けてある。このため、アーク１００の足が、アークホーン２０の延長部２４から傾斜部２３を駆動して傾斜部２３の先端に至る際に、アーク１００の足はエッジ部２５上を駆動する。これにより、アーク１００をアークホーン２０の先端により容易に導くことができる。
また、第２実施形態に係るアークホーン２０を備えた配電盤１においても、複数（この実施形態の場合３つ）の電源導体９のそれぞれの両側面に、一対の延長部２４、２４を通す一対の切欠き９３、９３を形成してある。このため、極間の絶縁距離を維持することが可能となり、耐電圧の低下を防止することができる。 Further, also in the arc horn 20 according to the second embodiment, the edge portion 25 for driving the arc 100 is provided on the side surface of the inclined portion 23 and the pair of extension portions 24 of the arc drive unit 22. Therefore, when the foot of the arc 100 drives the inclined portion 23 from the extension 24 of the arc horn 20 to reach the tip of the inclined portion 23, the foot of the arc 100 drives on the edge 25. Thus, the arc 100 can be easily guided to the tip of the arc horn 20.
Also, in the switchboard 1 including the arc horn 20 according to the second embodiment, a pair of extending portions 24 is passed through both side surfaces of the plurality (three in the case of this embodiment) of the power conductors 9. Notches 93, 93 are formed. For this reason, it becomes possible to maintain the insulation distance between poles, and it is possible to prevent a decrease in withstand voltage.

以上、本発明の実施形態について説明してきたが、本発明はこれに限定されずに種々の変更、改良を行うことができる。
例えば、第１実施形態に係るアークホーン２０及び第２実施形態に係るアークホーン２０の双方において、取付部２１とアーク駆動部２２は別体で構成し、それぞれを接合しているが、取付部２１及びアーク駆動部２２を一体で構成してもよい。
また、第１実施形態に係るアークホーン２０及び第２実施形態に係るアークホーン２０の双方において、傾斜部２３は、電源導体９の一面９１に対して負荷側が上がる形で約４５°の傾斜角度で傾斜しているが、電源導体９の一面９１に対して負荷側が上がる形で傾斜していればよく、傾斜角度は約４５°に限定されない。 As mentioned above, although embodiment of this invention was described, this invention can perform a various change and improvement, without being limited to this.
For example, in both of the arc horn 20 according to the first embodiment and the arc horn 20 according to the second embodiment, the mounting portion 21 and the arc driving portion 22 are separately configured and joined to each other, but the mounting portion 21 and the arc drive part 22 may be comprised integrally.
Further, in both of the arc horn 20 according to the first embodiment and the arc horn 20 according to the second embodiment, the inclined portion 23 has an inclination angle of about 45 ° with the load side rising with respect to the one surface 91 of the power supply conductor 9 The inclination angle is not limited to about 45 ° as long as the load side is inclined with respect to the one surface 91 of the power supply conductor 9.

更に、第１実施形態に係るアークホーン２０及び第２実施形態に係るアークホーン２０の双方において、一対の延長部２４、２４及び傾斜部２３の側面にエッジ部２５を設ける必要は必ずしもない。
また、第１実施形態に係るアークホーン２０を備えた配電盤１及び第２実施形態に係るアークホーン２０を備えた配電盤１において、電源導体９のそれぞれの両側面に、一対の切欠き９３を形成する必要は必ずしもない。この場合、一対の延長部２４は、取付部２１を取り付ける側の電源導体９のエッジ部分９１ａ及び取付部２１を取り付ける側と反対側の電源導体９のエッジ部分９２ａの双方を電源導体９の両側方から覆う。 Furthermore, in both the arc horn 20 according to the first embodiment and the arc horn 20 according to the second embodiment, the edge portions 25 need not necessarily be provided on the side surfaces of the pair of extension portions 24 and 24 and the inclined portion 23.
Further, in the switchboard 1 including the arc horn 20 according to the first embodiment and the switchboard 1 including the arc horn 20 according to the second embodiment, a pair of notches 93 is formed on both side surfaces of the power supply conductor 9. You don't have to. In this case, the pair of extension portions 24 both of the edge portion 91a of the power supply conductor 9 on the side to which the attachment portion 21 is attached and the edge portion 92a of the power supply conductor 9 opposite to the side on which the attachment portion 21 is attached Cover from the side.

また、第１実施形態に係るアークホーン２０において、一対の延長部２４、２４を連結する連結部２６は必ずしも設ける必要はない。
また、第１実施形態及び第２実施形態に係るアークホーン２０は、断面矩形状の平板で構成される複数の電源導体のそれぞれの一面に取り付けられて、隣接する電源導体間に発生するアークをアーク駆動経路の途中で停滞させるものであり、それが適用されるのは配電盤１のみならず、例えば、複数の電源導体が使用されるいわゆるバスダクトシステムと呼ばれる幹線配線システムに適用してもよい。 Further, in the arc horn 20 according to the first embodiment, the connecting portion 26 for connecting the pair of extension portions 24 is not necessarily required.
Further, the arc horn 20 according to the first embodiment and the second embodiment is attached to one surface of each of a plurality of power conductors formed of flat plates having a rectangular cross section, and generates an arc generated between adjacent power conductors. The present invention may be applied not only to the switchboard 1 but also to, for example, a trunk wiring system called a so-called bus duct system in which a plurality of power supply conductors are used.

１配電盤
９電源導体
２０アークホーン
２１取付部
２２アーク駆動部
２３傾斜部
２４延長部
２５エッジ部
２６連結部
９１電源導体の一面
９１ａエッジ部分
９１ｂエッジ部分
９２電源導体の他面
９３切欠き
１００アーク
DESCRIPTION OF SYMBOLS 1 Power distribution board 9 Power supply conductor 20 Arc horn 21 Mounting part 22 Arc drive part 23 Inclined part 24 Extension part 25 Edge part 26 Connection part 91 One side of power supply conductor 91a Edge part 91b Edge part 92 Other side of power supply conductor 93 Notch 100 Arc

Claims

An arc horn attached to one surface of a plurality of power conductors formed of flat plates having a rectangular cross section, for stagnating an arc generated between adjacent power conductors in the middle of an arc drive path,
A mounting portion attached to one surface of the power supply conductor, and a conductive arc drive portion attached to the mounting portion;
The arc driving portion includes an inclined portion extending from the mounting portion so as to be inclined with respect to one surface of the power supply conductor, an edge portion of the power supply conductor extending from the inclined portion and the mounting portion attached and the mounting portion An arc horn comprising: a pair of extensions covering both of the edge portions of the power supply conductor opposite to the side on which the power supply conductor is attached, from both sides of the power supply conductor.

The arc horn according to claim 1, wherein the pair of extension portions are connected by a connecting portion covering the other surface of the power supply conductor opposite to the side to which the attachment portion is attached.

The arc horn according to claim 1 or 2, wherein an edge portion for driving the arc is provided on the side surface of the inclined portion and the pair of extension portions of the arc drive portion.

A plurality of power supply conductors comprising a flat plate having a rectangular cross section, and the arc horn according to any one of claims 1 to 3 attached to one surface of each of the plurality of power supply conductors. Characteristic switchboard.

The switchboard according to claim 4, wherein a pair of notches through which the pair of extension parts pass is formed on both side surfaces of each of the plurality of power supply conductors.