JPH118914A - Closed-type distribution panel - Google Patents
Closed-type distribution panelInfo
- Publication number
- JPH118914A JPH118914A JP9159849A JP15984997A JPH118914A JP H118914 A JPH118914 A JP H118914A JP 9159849 A JP9159849 A JP 9159849A JP 15984997 A JP15984997 A JP 15984997A JP H118914 A JPH118914 A JP H118914A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- switchboard
- steel
- steel door
- closed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Patch Boards (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】この発明は、内部に電流を流
す導体を備え、強磁性材料で製作した箱体と覆いとでな
る閉鎖形配電盤に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a closed type switchboard having a conductor made of a ferromagnetic material and a conductor inside of which a current flows.
【0002】[0002]
【従来の技術】配電盤を構成する材料は、強度が高く加
工が容易で低価格であることが望まれる。このような要
求に応えることができる最も普遍的な材料が鋼鉄であ
る。しかもこの鋼鉄は強磁性である。そこで以下は、強
磁性材料である鋼鉄を使用して配電盤を構成し、この配
電盤の内部に設置した導体に電流が流れる場合について
説明する。なお、以下では導体に直流電流が流れる場合
について説明する。2. Description of the Related Art It is desired that a material constituting a switchboard has high strength, is easy to process, and is low in price. The most universal material that can meet such demands is steel. Moreover, this steel is ferromagnetic. Therefore, hereinafter, a case will be described in which a switchboard is configured using steel, which is a ferromagnetic material, and a current flows through a conductor installed inside the switchboard. Hereinafter, a case where a direct current flows through the conductor will be described.
【0003】導体に直流電流を流すと、この導体の周囲
に磁気力が働く空間,即ち磁界を生じるが、この磁界の
強さと導体に流れる電流の大きさとは相関している。こ
の導体の周囲は配電盤の構造材である鋼鉄で囲まれてい
るから、この磁界により生じる磁束は、空気よりもはる
かに透磁率が大である鋼鉄の中を好んで通過しようとす
る。When a direct current flows through a conductor, a space around the conductor where a magnetic force acts, that is, a magnetic field is generated. The strength of the magnetic field is correlated with the magnitude of the current flowing through the conductor. Since the conductor is surrounded by steel, which is a structural material of the switchboard, the magnetic flux generated by this magnetic field tends to pass through steel having much higher magnetic permeability than air.
【0004】ところで配電盤の前面や後面(場合によっ
ては側面)には、内部の機器を保守・点検できるような
開口部を設けるのであるが、通常は危険防止のためにこ
の開口部は閉鎖している。閉鎖の方法は種々あるが、片
側に蝶番を備えた扉あるいは吊りかけ式のカバーなどで
前記開口部を覆うのが一般的である。交流電流が流れる
場合に導体の周囲に発生する磁界は交番磁界である。こ
の交番磁界により配電盤の構造材には交番磁束が通る
と、これによりその構造材に渦電流が流れて当該構造材
の温度を上昇させるなどの不都合を生じる。そこで交流
電流を流す場合は、往路電流が流れる導体と復路電流が
流れる導体とを接近して配置するし、三相交流では3本
の導体を接近して配置するなどにより、構造材が鋼鉄製
であっても磁束が通過しないようにしている。しかし直
流電流の場合は導体が1本であっても発熱などの不都合
は発生しないので、往復2本の導体が接近しないように
配置する場合がよくある。[0004] By the way, openings are provided in the front and rear surfaces (or side surfaces in some cases) of the switchboard so that the internal equipment can be maintained and inspected. However, these openings are usually closed to prevent danger. I have. Although there are various closing methods, it is common to cover the opening with a door having a hinge on one side or a hanging-type cover. The magnetic field generated around the conductor when an alternating current flows is an alternating magnetic field. When an alternating magnetic flux passes through the structural member of the switchboard due to the alternating magnetic field, an eddy current flows through the structural member, thereby causing a problem such as an increase in the temperature of the structural member. Therefore, when an alternating current is passed, the conductor through which the forward current flows and the conductor through which the return current flows are arranged close to each other. Even in this case, the magnetic flux is prevented from passing. However, in the case of direct current, even if there is only one conductor, inconvenience such as heat generation does not occur, so that the two reciprocating conductors are often arranged so as not to approach.
【0005】[0005]
【発明が解決しようとする課題】導体に電流が流れてこ
の導体の周囲に磁界を生じるのが原因で、配電盤を構成
する箱体と扉とを磁束が通過する場合は、この磁束によ
り箱体と扉との間に吸引力が働く。この吸引力が大きけ
れば扉が開かなくなるし、吸引力が余り大きくない場合
でも、扉を簡単に開けられない等の不都合を生じること
がある。When a magnetic flux passes through a box and a door constituting a switchboard due to a current flowing through a conductor and a magnetic field generated around the conductor, the magnetic flux causes a box to be formed. A suction force works between the door and the door. If the suction force is large, the door cannot be opened, and even if the suction force is not so large, there may be inconveniences such as the door cannot be easily opened.
【0006】そこでこの発明の目的は、配電盤内に設置
した導体に流れる電流によって磁界が生じても、扉など
当該配電盤の覆いを容易に開けることができるようにす
ることにある。An object of the present invention is to make it possible to easily open a cover of a switchboard such as a door even if a magnetic field is generated by a current flowing through a conductor installed in the switchboard.
【0007】[0007]
【課題を解決するための手段】前記の目的を達成するた
めに、この発明の閉鎖形配電盤は、箱体を強磁性材料で
製作し、この箱体の開口部分を閉鎖する覆いを同じく強
磁性材料で製作して構成している配電盤で、前記箱体の
内部に電流を流す導体を備えている場合に、前記配電盤
を閉鎖する際に、非磁性材料でなる所定の厚さの間隔材
を、前記箱体と覆いとの間には介在させるものとする。In order to achieve the above object, a closed switchboard according to the present invention comprises a box made of a ferromagnetic material, and a cover for closing an opening of the box also made of a ferromagnetic material. When the switchboard is made of a material and is provided with a conductor that allows a current to flow inside the box, when closing the switchboard, a gap member having a predetermined thickness made of a non-magnetic material is used. It is to be interposed between the box and the cover.
【0008】この間隔材は前記覆いの全周囲に連続し
て、あるいは断続して介在させるものとする。[0008] The spacing member is interposed continuously or intermittently around the entire periphery of the cover.
【0009】[0009]
【発明の実施の形態】図3は配電盤を構成する箱体と扉
とその中に設置された導体とを示した従来の閉鎖形配電
盤の斜視図である。この閉鎖形配電盤は箱体2と鋼鉄製
扉4とでなり、両者は蝶番5で結合されている。配電盤
の内部には直流電流が流れる導体6が設置されているか
ら、この配電盤の運転中は、危険防止も兼ねて鋼鉄製扉
4を閉じておく。ここで導体6を流れる直流電流の方向
を太い矢印の7で示す。導体6に矢印7の方向に電流が
流れると、右ねじの法則により、矢印8で示す方向の磁
界を生じるのは周知である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 is a perspective view of a conventional closed switchboard showing a box constituting a switchboard, a door and conductors installed therein. This closed switchboard comprises a box 2 and a steel door 4, both of which are connected by hinges 5. Since the conductor 6 through which a DC current flows is installed inside the switchboard, during operation of the switchboard, the steel door 4 is closed to prevent danger. Here, the direction of the direct current flowing through the conductor 6 is indicated by a thick arrow 7. It is well known that when a current flows through the conductor 6 in the direction of the arrow 7, a magnetic field in the direction indicated by the arrow 8 is generated by the right-hand rule.
【0010】図4は図3に図示の従来の閉鎖形配電盤を
上から見た平面図である。箱体2の両側面は鋼鉄製枠3
で構成されており、その前面には鋼鉄製扉4があり、こ
の図4は鋼鉄製扉4が閉じている場合である。内部の導
体6には前述したように下から上へ向かって電流が流れ
ている。そこでこの電流により発生する磁界と同じ方向
に磁束が流れるが、この磁束には空気中を通る磁束10
と鋼鉄中を通る磁束11とがある。前述したように、強
磁性体である鋼鉄の透磁率は空気の透磁率よりはるかに
大きいので、磁束の大部分は鋼鉄中を通る。しかし導体
6と鋼鉄製枠3や鋼鉄製扉4との位置関係で、全ての磁
束が鋼鉄中を通るわけではなく、空気中を通る磁束10
も存在する。FIG. 4 is a plan view of the conventional closed switchboard shown in FIG. 3 as viewed from above. Both sides of the box 2 are steel frames 3
, And a steel door 4 is provided on the front surface thereof. FIG. 4 shows a case where the steel door 4 is closed. As described above, the current flows through the internal conductor 6 from the bottom to the top. Then, a magnetic flux flows in the same direction as the magnetic field generated by this current.
And a magnetic flux 11 passing through the steel. As mentioned above, the magnetic permeability of steel, which is a ferromagnetic material, is much greater than that of air, so that most of the magnetic flux passes through the steel. However, due to the positional relationship between the conductor 6 and the steel frame 3 or the steel door 4, not all the magnetic flux passes through the steel, but the magnetic flux 10 passing through the air.
Also exists.
【0011】鋼鉄製扉4が閉じているとき、鋼鉄製枠3
と鋼鉄製扉4との隙間dはごく僅かであって零と考えて
もよい。鋼鉄中を通る磁束11が鋼鉄製枠3から鋼鉄製
扉4へと流れるとき、この両者の間には吸引力を生じ
る。この吸引力は磁束の量に比例し、隙間dの2乗に逆
比例する。従って導体6を流れる電流により生じる全磁
束中で鋼鉄中を通る磁束11の割合が大であれば、また
隙間dが小であれば前記吸引力は大きくなり、扉が開け
にくくなる。When the steel door 4 is closed, the steel frame 3
The gap d between the steel door 4 and the steel door 4 is very small and may be considered to be zero. When the magnetic flux 11 passing through the steel flows from the steel frame 3 to the steel door 4, an attractive force is generated between the two. This attractive force is proportional to the amount of magnetic flux and inversely proportional to the square of the gap d. Therefore, if the ratio of the magnetic flux 11 passing through the steel in the total magnetic flux generated by the current flowing through the conductor 6 is large, and if the gap d is small, the attractive force becomes large, and the door is difficult to open.
【0012】図1は本発明の実施例を表した閉鎖形配電
盤の平面図である。本発明の実施例である図1と前述し
た従来例の図4とは、箱体2と鋼鉄製扉4との間に非磁
性間隔材12が挿入されているのが異なる点である。非
磁性間隔材12が挿入されると、箱体2と鋼鉄製扉4と
の間隔はこの非磁性間隔材12の厚み分だけ増大する。
前述したように、吸引力は隙間の2乗に逆比例するか
ら、吸引力は大幅に減少する。従って非磁性間隔材12
の厚さを大きくすれば扉が開かなくなる恐れは解消でき
る。更に、非磁性間隔材12はその透磁率が空気と同じ
程度の小さな値であるから、鋼鉄中を通る磁束11の磁
気抵抗が増加する。そのため全磁束中で鋼鉄中を通る磁
束11の割合が減少するから、これによっても箱体2と
鋼鉄製扉4との間の吸引力は減少する。FIG. 1 is a plan view of a closed switchboard showing an embodiment of the present invention. FIG. 1 which is an embodiment of the present invention and FIG. 4 which is the above-mentioned conventional example are different in that a non-magnetic spacer 12 is inserted between the box body 2 and the steel door 4. When the nonmagnetic spacer 12 is inserted, the distance between the box 2 and the steel door 4 increases by the thickness of the nonmagnetic spacer 12.
As described above, since the suction force is inversely proportional to the square of the gap, the suction force is greatly reduced. Therefore, the non-magnetic spacer 12
If the thickness is increased, the risk that the door will not open can be eliminated. Further, since the magnetic permeability of the nonmagnetic spacer 12 is as small as that of air, the magnetic resistance of the magnetic flux 11 passing through the steel increases. Therefore, the ratio of the magnetic flux 11 passing through the steel in the total magnetic flux is reduced, so that the attractive force between the box 2 and the steel door 4 is also reduced.
【0013】図2は本発明の別の実施例を表した閉鎖形
配電盤の斜視図である。箱体2と鋼鉄製扉4との間には
非磁性間隔材12を挿入するのであるが、図2で図示の
ように、配電盤上部に挿入している非磁性間隔材12は
連続した構成であり、配電盤側部に挿入している非磁性
間隔材12は断続している。非磁性間隔材12の主目的
は箱体2と鋼鉄製扉4との間隔を維持することにあるの
で、連続したものでも、断続したものでも差し支えはな
い。但し、上部に断続した非磁性間隔材12を挿入する
と、この非磁性間隔材12が無い部分から配電盤内部へ
塵が入る恐れがあるので、上部は連続した非磁性間隔材
12にすることが好ましい。FIG. 2 is a perspective view of a closed switchboard showing another embodiment of the present invention. The non-magnetic spacing member 12 is inserted between the box 2 and the steel door 4, and as shown in FIG. 2, the non-magnetic spacing member 12 inserted in the upper part of the switchboard has a continuous configuration. In addition, the nonmagnetic spacing member 12 inserted into the side of the switchboard is intermittent. Since the main purpose of the non-magnetic spacing member 12 is to maintain the spacing between the box 2 and the steel door 4, it may be continuous or intermittent. However, if the intermittent non-magnetic spacing member 12 is inserted into the upper portion, dust may enter the switchboard from a portion where the non-magnetic spacing member 12 does not exist. .
【0014】更に非磁性間隔材12は、真鍮など銅合金
製の硬い材料であっても、ゴムのように硬度が小さい材
料であっても、厚さ寸法に変化がなければ非磁性間隔材
12に使用することができる。Further, the non-magnetic spacing member 12 may be a hard material made of a copper alloy such as brass, or a material having a small hardness such as rubber, as long as the thickness dimension does not change. Can be used for
【0015】[0015]
【発明の効果】偏差形配電盤内に設置された導体に電流
が流れる際の磁束が、強磁性材料で構成した箱体から同
じく強磁性材料でなる覆いを通過する際の吸引力で、こ
の覆いが開かなくなる恐れがあるが、この発明によれ
ば、非磁性材料の間隔材を箱体と覆いとの間に挿入する
ことで、この部分を通過する磁束の量を減らすと共に、
間隔を増大させて吸引力を大幅に減少させている。その
結果、覆いが開かなくなったり、開けにくくなったりす
る不都合を回避できる効果が得られる。According to the present invention, the magnetic flux when a current flows through a conductor installed in a deviation type switchboard is attracted when passing from a box made of a ferromagnetic material through a cover also made of a ferromagnetic material. However, according to the present invention, the amount of magnetic flux passing through this portion can be reduced by inserting a spacer made of a non-magnetic material between the box and the cover.
The suction force is greatly reduced by increasing the spacing. As a result, it is possible to obtain an effect that it is possible to avoid a disadvantage that the cover does not open or becomes difficult to open.
【図1】本発明の実施例を表した閉鎖形配電盤の平面図FIG. 1 is a plan view of a closed switchboard showing an embodiment of the present invention.
【図2】本発明の別の実施例を表した閉鎖形配電盤の斜
視図FIG. 2 is a perspective view of a closed switchboard showing another embodiment of the present invention.
【図3】配電盤を構成する箱体と扉とその中に設置され
た導体とを示した従来の閉鎖形配電盤の斜視図FIG. 3 is a perspective view of a conventional closed switchboard showing a box, a door, and a conductor installed in the switchboard that constitute the switchboard;
【図4】図3に図示の従来の閉鎖形配電盤を上から見た
平面図4 is a plan view of the conventional closed switchboard shown in FIG. 3 as viewed from above.
2 箱体 3 鋼鉄製枠 4 鋼鉄製扉 5 蝶番 6 導体 7 電流方向 8 磁界方向 10 空気中を通る磁束 11 鋼鉄中を通る磁束 12 非磁性間隔材 2 Box 3 Steel frame 4 Steel door 5 Hinge 6 Conductor 7 Current direction 8 Magnetic field direction 10 Magnetic flux passing through air 11 Magnetic flux passing through steel 12 Non-magnetic spacing material
Claims (3)
一部または全部が開口している強磁性材料で製作した箱
体の内部に電流を流す導体を備え、この強磁性材料製箱
体の前記開口部分を強磁性材料で製作した覆いで閉鎖す
る構成の閉鎖形配電盤において、 前記箱体と覆いとの間には非磁性材料でなる所定の厚さ
の間隔材を介在させることを特徴とする閉鎖形配電盤。1. A box made of a ferromagnetic material having a front part, a rear part, or a side part, which is partially or wholly open, made of a ferromagnetic material. In a closed switchboard having a configuration in which the opening of the body is closed with a cover made of a ferromagnetic material, a spacing member having a predetermined thickness made of a nonmagnetic material is interposed between the box and the cover. Closed switchboard featured.
前記間隔材は前記覆いの全周囲に介在させることを特徴
とする閉鎖形配電盤。2. The closed switchboard according to claim 1,
A closed switchboard, wherein the spacing member is interposed all around the cover.
前記間隔材は前記覆いの周囲に断続的に介在させること
を特徴とする閉鎖形配電盤。3. The closed switchboard according to claim 1,
A closed switchboard, wherein the spacer is intermittently interposed around the cover.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9159849A JPH118914A (en) | 1997-06-17 | 1997-06-17 | Closed-type distribution panel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9159849A JPH118914A (en) | 1997-06-17 | 1997-06-17 | Closed-type distribution panel |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH118914A true JPH118914A (en) | 1999-01-12 |
Family
ID=15702587
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9159849A Pending JPH118914A (en) | 1997-06-17 | 1997-06-17 | Closed-type distribution panel |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH118914A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4683102A (en) * | 1983-06-17 | 1987-07-28 | Framatome & Cie. | Device for operating a cluster of neutron absorber elements in a pressurized water nuclear reactor |
JP2013126262A (en) * | 2011-12-13 | 2013-06-24 | Fuji Electric Co Ltd | Closed type switchboard |
-
1997
- 1997-06-17 JP JP9159849A patent/JPH118914A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4683102A (en) * | 1983-06-17 | 1987-07-28 | Framatome & Cie. | Device for operating a cluster of neutron absorber elements in a pressurized water nuclear reactor |
JP2013126262A (en) * | 2011-12-13 | 2013-06-24 | Fuji Electric Co Ltd | Closed type switchboard |
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