JP6082240B2 - Closed switchboard - Google Patents

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JP6082240B2
JP6082240B2 JP2012269499A JP2012269499A JP6082240B2 JP 6082240 B2 JP6082240 B2 JP 6082240B2 JP 2012269499 A JP2012269499 A JP 2012269499A JP 2012269499 A JP2012269499 A JP 2012269499A JP 6082240 B2 JP6082240 B2 JP 6082240B2
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arc
conductor
bus
main circuit
switchboard
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JP2014117078A (en
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岳 浅沼
岳 浅沼
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Fuji Electric Co Ltd
Fuji Electric FA Components and Systems Co Ltd
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Fuji Electric Co Ltd
Fuji Electric FA Components and Systems Co Ltd
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Description

本発明は、盤内に電源側から負荷側に給電する裸バー導体の主回路母線を布設した受電盤，母線盤などを対象とする閉鎖型配電盤に関し、詳しくは短絡事故が基で主回路母線導体の相間に発生したアークが母線導体を伝搬して負荷側の機器，配電盤の筐体を損傷するのを防ぐ母線の回路構成に関する。   The present invention relates to a closed type distribution board for a power receiving board, a bus board, etc., in which a main circuit bus of a bare bar conductor that feeds power from a power supply side to a load side is installed in the board, and more specifically, a main circuit bus based on a short circuit accident The present invention relates to a circuit configuration of a bus that prevents an arc generated between conductor phases from propagating through the bus conductor and damaging a load-side device and a switchboard casing.

この種の閉鎖型配電盤においては、盤内に布設した主回路母線に万一短絡事故が生じると母線導体の相間にアークが発生する。この場合に母線が絶縁の施されない裸のバー導体で構成されていると、アークに流れる電流と電源側からアーク発生地点に向けて母線導体に流れる電流の磁界との間に作用する電磁力（ローレンツ力）を受けて、アークが母線導体に沿って電源側から負荷側に駆動される。   In this type of closed type switchboard, if a short circuit accident occurs in the main circuit bus laid in the board, an arc is generated between the phases of the bus conductors. In this case, if the bus bar is composed of a bare bar conductor that is not insulated, the electromagnetic force acting between the current flowing in the arc and the magnetic field of the current flowing in the bus conductor from the power source side toward the arc generation point ( Under the Lorentz force, the arc is driven from the power source side to the load side along the bus conductor.

この場合に、アークが母線導体に接続された負荷側の機器、母線の周辺に配置されている計測，制御機器に伝搬すると、これらの各機器がアークに曝されて焼損、破損するほか、アークが配電盤の筐体の壁面に直接接触した場合にはアーク熱により筐体が破損してアークによって発生された盤内の高温ガスが盤外周囲に放出されるなど、重大なアーク事故に進展するおそれがある。   In this case, if the arc propagates to the load-side equipment connected to the bus conductor and the measurement and control equipment arranged around the bus, each of these equipment is exposed to the arc and burns and breaks. If the battery is in direct contact with the wall surface of the switchboard cabinet, it will cause a serious arc accident, for example, the case will be damaged by arc heat and the high-temperature gas generated by the arc will be released to the outside of the cabinet. There is a fear.

そこで、盤内に布設した主回路母線に万一短絡事故が生じてアークが発生した場合には、このアークが負荷側の機器，配電盤の筐体壁面に伝搬しないように停滞させてアークを減衰，鎮静化させる対策が望まれ、その手段として負荷側に通じる母線導体の途中の屈曲部から分岐してアークを停滞位置に誘導するアークホーン形の補助導体を設け、電源側から母線導体の屈曲部まで伝搬して来たアークを母線導体から補助導体に誘導して負荷側機器へのアーク伝搬を防ぐようにした配電盤の構成が知られており（例えば、特許文献１参照）、その盤内構造を図５，図６に示す。   Therefore, in the unlikely event that a short circuit accident occurs on the main circuit bus line installed in the panel, this arc is stagnated so that it does not propagate to the load-side equipment or the wall surface of the switchboard, and the arc is attenuated. Measures to calm down are desired, and as a means for this, an arc horn-shaped auxiliary conductor that branches off from a bent portion in the middle of the bus conductor leading to the load side and guides the arc to a stagnant position is provided, and the bus conductor is bent from the power source side. There is known a configuration of a switchboard in which an arc propagating to a part is guided from a bus conductor to an auxiliary conductor to prevent arc propagation to a load side device (see, for example, Patent Document 1). The structure is shown in FIGS.

図３，図４において、１は閉鎖型配電盤（母線盤）、２は電源側から盤内に引き込んで布設した、Ｒ，Ｓ，Ｔの各相導体からなる主回路母線、２ａは主回路母線２から負荷側に向けて延在する導体屈曲部、２ｂは導体屈曲部２ａの根元から分岐して母線２と同じ方向に延在するよう設けたアーク誘導用の補助導体である。   3 and 4, 1 is a closed type distribution board (bus board), 2 is a main circuit bus made of R, S, and T phase conductors, and 2a is a main circuit bus that is drawn into the board from the power source side. A conductor bent portion 2b extending from 2 toward the load side is an auxiliary conductor for arc induction provided so as to branch from the base of the conductor bent portion 2a and extend in the same direction as the bus 2.

上記の構成で受電中に盤内に布設した主回路母線２に万一短絡事故が発生して母線導体の２相間にアーク３が発生すると、アーク３はアーク電流と電源側から主回路母線２に流れる電流の作る磁界との間に作用する電磁力Ｆ（ローレンツ力）を受け、図４に示すように母線導体R、Sに沿って電源側から負荷側に向けて駆動される。ここで、アーク３が導体屈曲部２ａまで伝搬すると、アーク３は直線状に延在する補助導体２ｂに移行してその先端部に停滞し、その後に電源側に接続した上位の遮断器が電流を遮断してアークを消滅させる。これにより主回路母線２の負荷側に接続された機器がアーク３に曝されるのを回避することができる。   With the above configuration, if a short circuit accident occurs in the main circuit bus 2 installed in the panel during power reception and an arc 3 is generated between the two phases of the bus conductor, the arc 3 is connected to the main circuit bus 2 from the arc current and the power source side. In response to an electromagnetic force F (Lorentz force) acting between the magnetic field generated by the current flowing through the power source, it is driven from the power source side toward the load side along the bus conductors R and S as shown in FIG. Here, when the arc 3 propagates to the conductor bent portion 2a, the arc 3 moves to the auxiliary conductor 2b extending in a straight line and stagnates at the tip thereof, and then the upper circuit breaker connected to the power source side has a current. To interrupt the arc. Thereby, it is possible to avoid exposure of the device connected to the load side of the main circuit bus 2 to the arc 3.

特開平６−３８３１５号公報JP-A-6-38315

ところで、特許文献１の開示されている構造（図５，図６参照）では、盤内の主回路母線２に接続したアーク誘導用の補助導体２ｂが配電盤２の筐体壁面１ａに向けて突出していることから、補助導体２ｂの先端と配電盤１の筐体壁面１ａとの間の距離が十分確保されてないと、補助導体２ｂの先端に停滞したアーク３が配電盤１の筐体側壁１ａに触れて筐体の壁面１ａが破損する危険性があるため、筐体と補助導体２ｂの先端との間の十分な絶縁距離を確保するために配電盤１の筐体を大きく作る必要がある。   By the way, in the structure disclosed in Patent Document 1 (see FIGS. 5 and 6), the auxiliary conductor 2b for arc induction connected to the main circuit bus 2 in the panel protrudes toward the housing wall surface 1a of the switchboard 2. Therefore, if the distance between the tip of the auxiliary conductor 2b and the casing wall surface 1a of the switchboard 1 is not sufficiently secured, the arc 3 stagnated at the tip of the auxiliary conductor 2b is generated on the casing sidewall 1a of the switchboard 1. Since there is a risk that the wall surface 1a of the casing may be damaged by touching, it is necessary to make the casing of the switchboard 1 large in order to ensure a sufficient insulation distance between the casing and the tip of the auxiliary conductor 2b.

なお、盤内に布設した主回路母線２の全長域に亙って導体表面に樹脂等を被覆して母線の短絡事故時のアーク発生を防ぐ方法も考えられるが、その場合には主回路母線２に流れる電流のジュール発熱を盤外に放熱する冷却対策が必要となる。   It is also possible to prevent the occurrence of arcing in the event of a short circuit of the bus by covering the conductor surface with resin or the like over the entire length of the main circuit bus 2 installed in the panel. Cooling measures to dissipate the Joule heat generated by the current flowing to the outside of the panel are required.

本発明は上記の点に鑑みなされたものであり、その目的は先記の特許文献１に開示の補助導体を用いることなしに、簡易な手段で前記課題を解消して主回路母線に発生したアークから負荷側の機器を安全に保護できるようにした閉鎖型配電盤提供することにある。   The present invention has been made in view of the above points, and the object of the present invention is to solve the above-described problems with a simple means without using the auxiliary conductor disclosed in Patent Document 1 described above, and to generate the main circuit bus. An object of the present invention is to provide a closed type switchboard capable of safely protecting a load side device from an arc.

上記目的を達成するために、本発明によれば、盤内に電源側から負荷側に給電する裸バー導体の主回路母線を布設した閉鎖型配電盤において、前記主回路母線の布設経路の一部に各相の母線ごとに、その母線導体を包囲して導体周面に絶縁材により形成したアークブロック層を被着するものとする（請求項１）。   In order to achieve the above object, according to the present invention, in a closed type distribution board in which a main circuit bus of a bare bar conductor that feeds power from the power supply side to the load side is installed in the panel, a part of the installation path of the main circuit bus In addition, for each bus of each phase, an arc block layer that surrounds the bus conductor and is formed of an insulating material is attached to the peripheral surface of the conductor (claim 1).

ここで、前記のアークブロック層は、前記主回路母線の布設経路の負荷側の前記閉鎖型配電盤の内壁に近い位置に設けるのがよい(請求項２)。   Here, the arc block layer is preferably provided at a position close to the inner wall of the closed type switchboard on the load side of the laying path of the main circuit bus (Claim 2).

また、このアークブロック層は、アーク熱を受けてアブレーションガスを発生する高分子樹脂材で構成するのがよい（請求項３）。   The arc block layer is preferably made of a polymer resin material that generates arc gas upon receiving arc heat.

上記構成によれば，万一の短絡事故が基で主回路母線の相間に発生したアークが負荷側に向け母線導体上を伝搬する途上で絶縁材におより形成されたアークブロック層まで移動すると、このアークブロック層に阻まれてアークの発弧点がその位置に停滞するとともに、このアーク熱を受けて絶縁材により形成したアークブロック層の表面から溶発した高温高圧のアブレーションガスがアークに向けて噴出，拡散する。これにより、アークはアブレーションガスの反力を受け、電磁力（ローレンツ力）による伸長が抑えられるとともに、アブレーションガスの冷却作用によりアークエネルギーも減衰して鎮静化される。   According to the above configuration, when an arc generated between the phases of the main circuit buses is propagated on the bus conductor toward the load side due to a short circuit accident, it moves to the arc block layer formed by the insulating material. As the arc block layer is blocked by the arc block layer, the high temperature and high pressure ablation gas ablated from the surface of the arc block layer formed by the insulating material due to the arc heat is generated in the arc. It spouts and spreads. As a result, the arc receives the reaction force of the ablation gas, and the expansion due to the electromagnetic force (Lorentz force) is suppressed, and the arc energy is also attenuated and calmed by the cooling action of the ablation gas.

これにより、主回路母線の電源側導体上に発生したアークが母線導体を伝わって負荷側の機器、および配電盤の筐体壁面に向け伝搬するのを抑止して負荷側機器，盤筐体をアークから安全に保護できる。しかも、盤内に布設した主回路母線には、特許文献１のようにアークを停滞位置に向けて誘導する補助導体、および該補助導体の先端と盤筐体の壁面との間に絶縁距離の確保が必要なくなるので配電盤筐体の小形，コンパクト化が図れる。また、母線導体はその全長域を絶縁物で被覆する必要も無いので、母線導体のジュール発熱対する放熱性も問題ない。   As a result, the arc generated on the power supply side conductor of the main circuit bus is prevented from propagating along the bus conductor toward the load side equipment and the wall surface of the switchboard cabinet, and the load side equipment and the board casing are arced. Can be safely protected from. In addition, the main circuit bus laid in the panel includes an auxiliary conductor that guides the arc toward the stagnation position as in Patent Document 1, and an insulation distance between the tip of the auxiliary conductor and the wall surface of the panel housing. Since securing is no longer necessary, the switchboard housing can be made smaller and more compact. Further, since it is not necessary to cover the entire length of the bus bar conductor with an insulator, there is no problem with the heat dissipation of the bus bar conductor against Joule heat generation.

本発明の実施例１に係わる閉鎖型配電盤の盤内構造を表す模式図である。It is a schematic diagram showing the in-panel structure of the closed type switchboard concerning Example 1 of this invention. 図１における主回路母線に被着した絶縁材により形成したアークブロック層によるアーク伝搬抑止機能を表す説明図である。It is explanatory drawing showing the arc propagation suppression function by the arc block layer formed of the insulating material deposited on the main circuit bus in FIG. 本発明の実施例２に係わる閉鎖型配電盤の盤内構造を表す模式図である。It is a schematic diagram showing the in-panel structure of the closed type switchboard concerning Example 2 of this invention. 図３における主回路母線に被着した絶縁材により形成したアークブロック層によるアーク伝搬抑止機能を表す説明図である。It is explanatory drawing showing the arc propagation suppression function by the arc block layer formed of the insulating material deposited on the main circuit bus in FIG. 特許文献１に開示されている配電盤の盤内構造を表す模式図である。It is a schematic diagram showing the in-panel structure of the switchboard currently disclosed by patent document 1. FIG. 図５における主回路母線の補助導体によるアーク伝搬抑止機能を表す説明図である。It is explanatory drawing showing the arc propagation suppression function by the auxiliary conductor of the main circuit bus in FIG.

以下、この発明による昇温装置の実施の形態を図１，図２に示す実施例に基づいて説明する。なお、実施例１，実施例２の図中で図５，図６に対応する部材には同じ符号を付してその詳細な説明は省略する。   DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a temperature raising apparatus according to the present invention will be described below based on the examples shown in FIGS. In the drawings of Embodiment 1 and Embodiment 2, members corresponding to those in FIGS. 5 and 6 are denoted by the same reference numerals, and detailed description thereof is omitted.

図１，図２に示す実施例１の閉鎖型配電盤１においては、その盤内に布設した主回路母線に対し、電源側導体２から盤内の前方に引き出した負荷側導体２ａよりも電源側に近い経路の中間部位に位置に揃えてＲ，Ｓ，Ｔ各相の母線導体を個別に包囲するように、その導体周面に絶縁材で形成したアークブロック層４を被着している。ここで、アークブロック層４は、アーク熱を受けてアブレーションガスを溶発する高分子材（ポリマー）として例えばＰＯＭ（ポリアセタール樹脂），ＰＴＴＥ（ポリテトラフルオロエチレン樹脂）などのポリマー・バルク材で形成されている。   In the closed type switchboard 1 of the first embodiment shown in FIGS. 1 and 2, the main circuit bus laid in the panel is on the power source side with respect to the load side conductor 2a drawn forward from the power source conductor 2 in the panel. An arc block layer 4 made of an insulating material is deposited on the peripheral surface of the conductor so as to individually surround the bus conductors of the R, S, and T phases so as to be aligned with the intermediate portion of the path close to. Here, the arc block layer 4 is formed of a polymer bulk material such as POM (polyacetal resin) or PTTE (polytetrafluoroethylene resin) as a polymer material (polymer) that ablates ablation gas by receiving arc heat. ing.

上記の構成により、主回路母線に万一発生した短絡事故が基で電源側導体２の相間に発生したアーク３は、先に図４で述べたように電磁力Ｆ（ローレンツ力）を受けて電源側から負荷側に向けて母線導体上で駆動されるが、その際にアーク３が前記のアークブロック層４の被着された位置まで伝搬すると、図２で表すようにアークブロック層４に阻まれてアーク３の発弧点がその位置に停滞したまま、電磁力Ｆによりアーク長が伸長して図示のように隣り合うアークブロック層４の間の間隙に押し込まれるようになる。この状態になると、高温のアーク熱により絶縁材で形成したアークブロック層４の表面からアブレーションガス５が溶発するようになる。   With the above configuration, the arc 3 generated between the phases of the power supply side conductor 2 due to a short circuit accident that occurred in the main circuit bus is subjected to the electromagnetic force F (Lorentz force) as described above with reference to FIG. Driven on the bus conductor from the power source side to the load side, when the arc 3 propagates to the position where the arc block layer 4 is deposited, the arc block layer 4 is shown in FIG. The arc length is extended by the electromagnetic force F and the arc point of the arc 3 stays at that position and is pushed into the gap between the adjacent arc block layers 4 as shown in the figure. In this state, the ablation gas 5 is ablated from the surface of the arc block layer 4 formed of an insulating material by high-temperature arc heat.

この場合にアブレーションガスはアーク熱を受けて高温，高圧ガスとなり、隣り合うアークブロック４の相互間隙を蓄圧空間として図示の矢印Ｇで表すようにアーク３に向け、噴流となって拡散する。これにより、アーク３はアブレーションガス５による反力を受けて負荷側導体２ａへの伝搬が抑えられるとともに、アーク３に吹きつけられるアブレーションガス５の冷却作用によりアークエネルギーも減衰して鎮静化される。   In this case, the ablation gas is subjected to arc heat to become high-temperature and high-pressure gas, and diffuses as a jet toward the arc 3 as indicated by the arrow G shown in the drawing, with the inter-gap between adjacent arc blocks 4 as a pressure accumulation space. As a result, the arc 3 receives reaction force from the ablation gas 5 and is prevented from propagating to the load-side conductor 2a, and the arc energy is also attenuated by the cooling action of the ablation gas 5 blown to the arc 3 and is calmed down. .

その結果、主回路母線２の電源側導体上に発生したアーク３が母線導体を伝わって負荷側導体２ａに接続された負荷側機器、あるいは負荷側導体２ａの引き出しコーナー部位に間隔を隔てて対峙する配電盤筐体の内壁面に伝搬するのを抑止して負荷側機器，盤筐体をアークから安全に保護できる。しかも、盤内に布設した主回路母線２には、特許文献１のようにアークを停滞位置に向けて誘導する補助導体、および該補助導体の先端と盤筐体の壁面との間に所要の絶縁距離を確保する必要なくなるので、配電盤筐体を小形，コンパクトに構成できる。   As a result, the arc 3 generated on the power supply side conductor of the main circuit bus 2 passes through the bus conductor and confronts the load side device connected to the load side conductor 2a or the lead corner portion of the load side conductor 2a with an interval. Propagation to the inner wall surface of the switchboard cabinet to be performed can be suppressed, and the load side device and the cabinet can be safely protected from the arc. Moreover, the main circuit bus 2 laid in the panel has an auxiliary conductor for guiding the arc toward the stagnation position as in Patent Document 1, and a required space between the tip of the auxiliary conductor and the wall surface of the panel housing. Since it is no longer necessary to secure an insulation distance, the switchboard housing can be made compact and compact.

次に、本発明の請求項２に対応する実施例２の構成を図３，図４に基づいて説明する。この実施例２においては、閉鎖型配電盤１の盤内に布設した主回路母線の電源側導体２に被着したアークブロック層４が、先記の実施例１とは異なり次記のような位置に設けられている。   Next, the structure of Example 2 corresponding to Claim 2 of this invention is demonstrated based on FIG. 3, FIG. In the second embodiment, the arc block layer 4 attached to the power source side conductor 2 of the main circuit bus line laid in the panel of the closed type switchboard 1 is different from the first embodiment in the following position. Is provided.

すなわち、アークブロック層４が、Ｒ，Ｓ，Ｔ各相に対応する電源側導体２から盤内の前方に引き出した負荷側導体２ａの引き出し部（導体の屈曲コーナー部）を包囲して閉鎖型配電盤１の内壁１ａに近い位置に設けている。   In other words, the arc block layer 4 surrounds the lead-out portion (bending corner portion of the conductor) of the load-side conductor 2a drawn forward from the power-side conductor 2 corresponding to the R, S, and T phases in the panel. The switchboard 1 is provided at a position close to the inner wall 1a.

この構成におけるアーク３の移動制止，および鎮静効果は先述した原理と同様であるが、先記の実施例１と比べてアークブロック層４の位置を負荷側に寄せた分だけ短絡アークの制止保護範囲が拡大する。しかも、閉鎖配電盤１の内壁１ａ（筐体側壁）に接近して対峙する負荷側導体２ａの引き出しコーナー部分を絶縁材のアークブロック層４で覆うことで、主回路母線と盤筐体の内壁１ａとの間の絶縁距離を実施例１（図１参照）より更に短縮して盤の小型，コンパクト化が図れる。   The movement restraint and sedation effect of the arc 3 in this configuration are the same as the principle described above, but the short-circuit arc restraint protection by the amount the arc block layer 4 is moved to the load side as compared with the first embodiment. The range expands. In addition, the main circuit bus and the inner wall 1a of the panel housing are covered by covering the lead corner portion of the load-side conductor 2a facing the inner wall 1a (housing side wall) of the closed switchboard 1 with an arc block layer 4 made of an insulating material. The board can be made smaller and more compact by further shortening the insulation distance between the two and the first embodiment (see FIG. 1).

１：閉鎖型配電盤
２：主回路母線
２ａ：負荷側導体
３：アーク
４：絶縁材により形成したアークブロック層
５：アブレーションガス 1: closed distribution board 2: main circuit bus 2a: load-side conductor 3: arc 4: arc block layer formed of insulating material 5: ablation gas

Claims (2)

盤内に電源側から負荷側に給電する裸バー導体の主回路母線を布設した閉鎖型配電盤において、
前記主回路母線の布設経路の一部に各相の母線ごとに、その母線導体の電源側から盤内の前方に引き出した負荷側の屈曲コーナー部を包囲して導体周面に絶縁材により形成したアークブロック層を被着するとともに、
前記アークブロック層がアーク熱を受けてアブレーションガスを発生する高分子樹脂材で構成されたことを特徴とする閉鎖型配電盤。 In a closed type switchboard in which a main circuit bus of a bare bar conductor that feeds power from the power supply side to the load side is installed in the panel,
A part of the laying path of the main circuit bus is formed of an insulating material on the conductor peripheral surface surrounding the load-side bent corner portion drawn out from the power source side of the bus conductor to the front in the panel for each phase bus. with depositing arc blocking layer,
A closed type switchboard, wherein the arc block layer is made of a polymer resin material that generates arc gas upon receiving arc heat . 請求項１に記載の閉鎖型配電盤において、前記アークブロック層を前記主回路母線の布設経路の負荷側の閉鎖型配電盤の内壁に近い位置に被着することを特徴とする閉鎖型配電盤。

2. The closed type switchboard according to claim 1, wherein the arc block layer is attached to a position close to the inner wall of the closed type switchboard on the load side of the laying path of the main circuit bus.

JP2012269499A 2012-12-10 2012-12-10 Closed switchboard Active JP6082240B2 (en)

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JP6340991B2 (en) * 2014-08-19 2018-06-13 富士電機株式会社 Closed switchboard
US9515464B2 (en) * 2014-12-30 2016-12-06 Schneider Electric USA, Inc. Bus end arc interrupter
FR3040556B1 (en) 2015-08-25 2017-08-11 Zodiac Aero Electric ARC ELECTRIC EXTINGUISHING DEVICE FOR THREE-PHASE ELECTRIC POWER DISTRIBUTION SYSTEM AND CORRESPONDING ELECTRIC POWER DISTRIBUTION SYSTEM

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