JPH0648615B2 - Fuse element for simultaneous three-phase interruption and three-phase simultaneous interruption fuse - Google Patents
Fuse element for simultaneous three-phase interruption and three-phase simultaneous interruption fuseInfo
- Publication number
- JPH0648615B2 JPH0648615B2 JP2046464A JP4646490A JPH0648615B2 JP H0648615 B2 JPH0648615 B2 JP H0648615B2 JP 2046464 A JP2046464 A JP 2046464A JP 4646490 A JP4646490 A JP 4646490A JP H0648615 B2 JPH0648615 B2 JP H0648615B2
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- Prior art keywords
- phase
- simultaneous
- fuse
- fuse element
- resistor
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Description
【発明の詳細な説明】 [産業上の利用分野] この発明は、三相三線式や三相四線式など低圧配電線路
の保護に用いられるヒューズで、特に欠相保護用あるい
は異常電圧保護用として用いられる三相同時遮断用ヒュ
ーズエレメント及びこのヒューズエレメントを使用した
三相同時遮断ヒューズに関するものである。Description: TECHNICAL FIELD The present invention relates to a fuse used for protecting a low-voltage power distribution line such as a three-phase three-wire type or a three-phase four-wire type, and particularly for open-phase protection or abnormal voltage protection. The present invention relates to a three-phase simultaneous breaking fuse element used as the above and a three-phase simultaneous breaking fuse using this fuse element.
[従来の技術] この種ヒューズエレメントおよびヒューズとしては従来
から例えば第6図に示すようものが提供されている。[Prior Art] As a fuse element and a fuse of this type, a fuse element shown in, for example, FIG. 6 has been conventionally provided.
すなわち、密閉筒13内を隔壁14で仕切って遮断部1
5およびアーク短絡部16を構成し、両端を端子17に
接続して可溶体18a,18b、18cを内蔵したもの
で、一本の可溶体、例えば可溶体18aが溶断すると、
これによって発生した金属蒸気やアークが接近して配置
した他相間を短絡させ、大電流を流すことによって遮断
部15で回路を遮断するようにしたものである。That is, the inside of the closed cylinder 13 is partitioned by the partition wall 14 and the blocking unit 1
5 and the arc short-circuit portion 16 are connected to the terminals 17 at both ends and the fusible bodies 18a, 18b, and 18c are built therein. When one fusible body, for example, the fusible body 18a is fused,
The metal vapor or arc generated by this short-circuits the other phases arranged close to each other, and a large current is caused to flow to interrupt the circuit by the interruption section 15.
[発明が解決しようとする課題] 一般的にヒューズが溶断すると極間にはアークが発生
し、金属蒸気が充満する。各相のヒューズが接近して配
置されてあると、相間に金属蒸気が充満することにより
異相間の絶縁破壊が起り、アーク短絡が発生する。しか
しながらこの動作は必ずしも確実ではなく、異相間がア
ーク短絡しない場合も起り得る。すなわち、比較的大き
い電流域では金属蒸気が大量に発生し、異相間の絶縁が
簡単に破壊されてアーク短絡が確実に起るが、中電流域
においては偶発的となり、過負荷小電流域においてはア
ーク短絡はほとんど期待できない。従って一相が溶断し
ても他相が溶断せす、欠相運転や異常電圧発生となり、
三相ヒューズの誤動作となる危険性があった。[Problems to be Solved by the Invention] Generally, when the fuse is blown, an arc is generated between the electrodes, and the metal vapor is filled. When the fuses of the respective phases are arranged close to each other, the metal vapor is filled between the phases to cause a dielectric breakdown between different phases, thereby causing an arc short circuit. However, this operation is not always reliable, and may occur even when an arc short circuit does not occur between different phases. That is, in a relatively large current range, a large amount of metal vapor is generated, the insulation between different phases is easily destroyed, and an arc short circuit occurs reliably.However, in a medium current range, it becomes accidental and in an overload small current range. You can hardly expect an arc short circuit. Therefore, even if one phase melts, the other phase melts, resulting in open-phase operation or abnormal voltage.
There was a risk of malfunction of the three-phase fuse.
そこでこの発明の目的とするところは、一相が溶断した
場合には、確実に他の二相も溶断し、欠相運転や異常電
圧の発生を防止し得る三相同時遮断用ヒューズエレメン
ト及びこのヒューズエレメントを使用した三相同時遮断
ヒューズを提供することを目的とする。Therefore, an object of the present invention is to provide a fuse element for simultaneous three-phase disconnection, which can surely blow out the other two phases when one phase is blown out and prevent open-phase operation and abnormal voltage from occurring. An object of the present invention is to provide a three-phase simultaneous breaking fuse using a fuse element.
[課題を解決するための手段] 上記目的を達成するため、この発明においては、三相ヒ
ューズエレメント中、いずれかの一相の抵抗体が異常発
熱すると、この抵抗体に軸支した導電性アームが回動し
て隣接他相と接触して相間短絡を起し、三相ほぼ同時に
溶断させる短絡方式を採用したものである。[Means for Solving the Problems] In order to achieve the above object, in the present invention, when any one-phase resistor in the three-phase fuse element abnormally generates heat, a conductive arm axially supported by the resistor is provided. It rotates and contacts the adjacent other phase to cause an interphase short circuit, and the three phases are fused at about the same time.
すなわち、この発明に係る三相同時遮断用ヒューズエレ
メントは、三相の接続端子間に定格電流に合った断面積
の溶断部を有する抵抗体を接続し、この溶断部より二次
側寄りの位置において、各々の抵抗体を軸として回動可
能な導電性アームを設け、この導電性アームの軸支部を
低融点金属で抵抗体に固着するとともに、導電性アーム
にそのアーム端が隣接した他相と接触する方向に回動す
る弾発力を付与した構成としたものである。That is, the fuse element for simultaneous three-phase disconnection according to the present invention connects a resistor having a fusing part having a cross-sectional area suitable for the rated current between the three-phase connecting terminals, and a position closer to the secondary side than the fusing part. In (1), a conductive arm rotatable about each resistor is provided, and the shaft support of this conductive arm is fixed to the resistor with a low-melting metal, and the arm end is adjacent to the conductive arm. The structure is such that an elastic force that rotates in the direction of contact with is applied.
上記溶断部は互いに近接配置されていることが望ましい
が、このためには抵抗体を部分的に屈曲することによっ
て容易に達成できる。すなわち、三相の溶断部が互いに
近接配置されるように溶断部の位置する部分において抵
抗体を部分的に屈曲すれば良い。It is desirable that the fusing parts are arranged close to each other, but this can be easily achieved by partially bending the resistor. That is, the resistor may be partially bent at the portion where the fusing parts are located so that the three-phase fusing parts are arranged close to each other.
またこのような溶断部においてアークによる相間短絡を
強制的かつ確実に行い得る構成とすることもできる。す
なわち、抵抗体を屈曲するに際し、略U字状に屈曲し、
このU字状の水平部に溶断部を設ける構成とすればフレ
ミングの左手の法則によってアークを他相方向に駆動す
る力が働くので、アークによる相間短絡を強制的かつ確
実に行い得る。当該略U字状屈曲部を板状とし、このU
字状の水平部に小孔を設けて溶断部を形成すると、初期
発弧点が限定されるとともに、上記と同様にしてアーク
が他相方向に駆動されるため、強制的かつ確実な相間短
絡を達成できる。Further, it is also possible to adopt a configuration in which interphase short circuit due to an arc can be forcibly and surely performed in such a fusing part. That is, when the resistor is bent, it is bent into a substantially U shape,
If the fusing portion is provided in the U-shaped horizontal portion, the force for driving the arc in the other phase direction works according to Fleming's left-hand rule, so that the interphase short circuit by the arc can be forcibly and surely performed. The substantially U-shaped bent portion is formed into a plate shape, and the U
If a fusing part is formed by forming a small hole in the horizontal part of the character shape, the initial ignition point will be limited and the arc will be driven in the other phase direction in the same manner as above, so a forced and reliable interphase short circuit will occur. Can be achieved.
このようなヒューズエレメントを使用した三相同時遮断
ヒューズは、密閉容器の両端にリード線接続用の三相の
スリーブを設け、両端の接続端子を各相のスリーブに接
続して三相同時遮断用ヒューズエレメントを密閉容器内
に内蔵することによって得られる。A three-phase simultaneous disconnection fuse using such a fuse element is provided with three-phase sleeves for connecting lead wires at both ends of the sealed container, and connecting terminals at both ends are connected to sleeves for each phase for simultaneous three-phase disconnection. It is obtained by incorporating the fuse element in a closed container.
この場合、密閉容器の両側部を構成する絶縁部材に一端
を固着した絶縁パイプで一次側の抵抗体の接続端を囲撓
しておくと遮断後の絶縁抵抗が安定して確実な遮断が得
られる。In this case, if the connecting end of the resistor on the primary side is bent around with an insulating pipe whose one end is fixed to the insulating member that constitutes both sides of the closed container, the insulation resistance after disconnection will be stable and reliable disconnection will be obtained. To be
なお、抵抗体および導電性アームの材料としては銅、銅
ニッケル合金等の銅合金が好ましい。Copper and copper alloys such as copper-nickel alloys are preferable as the material of the resistor and the conductive arm.
[作用] 上記のように構成した三相同時遮断用ヒューズエレメン
トは、小電流域・中電流域においては低融点金属の溶融
に伴い弾発力を受けて導電性アームが回動し、そのアー
ム端が隣接する他相と接触して短絡するのでヒューズ二
次側のインピーダンスがなくなるため短絡電流が増加
し、溶断部において三相短絡が起り、三相ほぼ同時に溶
断して連動遮断が行われる。なお、大電流域ではアーク
短絡によって三相の溶断部がほぼ同時に溶断される。[Operation] In the fuse element for simultaneous three-phase interruption configured as described above, in the small current region / medium current region, the conductive arm rotates due to the elastic force due to the melting of the low melting point metal, and the arm is rotated. Since the end contacts the adjacent other phase and short-circuits, the impedance on the secondary side of the fuse disappears, so that the short-circuit current increases, a three-phase short circuit occurs at the fusing part, and the three phases are fused at the same time to perform interlocking interruption. In the large current region, the arc-short circuit causes the three-phase fused parts to be fused at almost the same time.
抵抗体を部分的に屈曲して三相の溶断部を互いに近接配
置した場合、大電流域における連動遮断は勿論、導電性
アームによる短絡を伴う小中電流域における連動遮断を
より確実とできる。When the resistors are partially bent and the three-phase fusing parts are arranged close to each other, the interlocking interruption in the large current area as well as the interlocking interruption in the small and medium current areas accompanied by the short circuit by the conductive arm can be more surely performed.
さらに加えて、抵抗体を略U字状に屈曲し、このU字状
の水平部に溶断部を設ける構成とすれば溶断部に近接す
る垂直部の回りに磁界が発生し、フレミングの左手の法
則に応じた力が働いてアークを他相に駆動するので三相
のアーク短絡による連動遮断がより確実となる。In addition, if the resistor is bent in a substantially U shape and the fusing part is provided in the horizontal part of the U shape, a magnetic field is generated around the vertical part close to the fusing part, and the left hand of Fleming's hand. Since the force according to the law works to drive the arc to the other phase, the interlocking interruption by the three-phase arc short circuit becomes more reliable.
また、当該略U字状屈曲部を板状とし、このU字状の水
平部に小孔を設けて溶断部を形成した場合、初期発弧点
が限定されるとともに、上記と同様のアーク駆動力によ
って連動遮断がより確実となる。Further, when the substantially U-shaped bent portion is formed into a plate shape and a small hole is provided in this U-shaped horizontal portion to form the fusing portion, the initial arcing point is limited and the same arc drive as above is performed. The force makes the interlocking cutoff more reliable.
このようなヒューズエレメントを使用して構成した三相
同時遮断ヒューズは、三相を確実に連動遮断することが
でき、欠相運転、異常電圧発生のおそれがない。The three-phase simultaneous cutoff fuse configured by using such a fuse element can surely interlock and cut off three phases, and there is no risk of open-phase operation or abnormal voltage generation.
絶縁パイプで一次側の抵抗体の接続端を囲撓した三相同
時遮断ヒューズは、連動遮断後の絶縁抵抗が高く、遮断
効果が安定する。The three-phase simultaneous cutoff fuse in which the connection end of the primary side resistor is bent with an insulating pipe has a high insulation resistance after interlocking cutoff, and the cutoff effect is stable.
[実施例] 以下添附図面に示した実施例に従って説明する。第1図
は、この発明に係る三相ヒューズエレメントの一実施例
を示す斜視図で、1a、1b、1cは三対の接続端子で
あり、各接続端子間には定格電流にあった断面積の溶断
部2a,2b,2cを有する抵抗体3a,3b,3cが
接続されている。4a、4b、4cは、溶断部よりも二
次側(図面の右側)よりの位置において各々の抵抗体を
軸として回動可能に設けた導電性アームであり、軸支部
5a、5b、5cにおいて抵抗体に軸支されるとともに
低融点合金6a、6b、6bによって抵抗体に固着され
ている。この固着状態においては隣接抵抗体と非接触状
態に設けられているが、低融点合金が溶融した際にはア
ーム端が隣接した他相と接触する方向に回動するよう弾
発力が付与されている。[Embodiment] An embodiment will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing an embodiment of a three-phase fuse element according to the present invention. 1a, 1b, 1c are three pairs of connection terminals, and a cross-sectional area suitable for the rated current is provided between the connection terminals. The resistors 3a, 3b, 3c having the fusing parts 2a, 2b, 2c are connected. Reference numerals 4a, 4b, and 4c denote conductive arms that are rotatably provided around respective fusing elements at a position from the secondary side (right side in the drawing) of the fusing portion, and in the shaft support portions 5a, 5b, and 5c. It is axially supported by the resistor and fixed to the resistor by low melting point alloys 6a, 6b, 6b. In this fixed state, it is provided in a non-contact state with the adjacent resistor, but when the low melting point alloy is melted, an elastic force is applied so that the arm end rotates in the direction of coming into contact with another adjacent phase. ing.
従って、小中電流域の過電流が例えば抵抗体3aに流れ
ると、抵抗体3の発熱により低融点合金6aが溶融し、
バネ力を受けた導電性アーム4aが回動してそのアーム
端が隣接する他相に接触して相間短絡が発生する。これ
によりヒューズ二次側のインピーダンスがなくなるため
短絡電流が増加し、溶断部2a、2b、2cにおいて三
相アーク短絡が起り三相ほぼ同時に溶断して連動遮断さ
れる構成となっている。Therefore, when an overcurrent in the small / medium current region flows in the resistor 3a, the low melting point alloy 6a is melted by the heat generation of the resistor 3,
The conductive arm 4a receiving the spring force rotates, and its arm end contacts another adjacent phase to cause an interphase short circuit. As a result, the impedance on the secondary side of the fuse disappears, so that the short-circuit current increases, and a three-phase arc short-circuit occurs in the fusing parts 2a, 2b, 2c, and the three phases are blown at substantially the same time and are interlocked.
第2図は、ヒューズエレメントの他例とともに三相同時
遮断ヒューズの一例を示す斜視図で、3a、3b、3c
は定格電流にあった断面積の溶断部2a、2b、2cを
有する抵抗体、4a、4b、4cは、溶断部よりも二次
側(図面の右側)よりの位置において各々の抵抗体を軸
として回動可能に設けた導電性アームであり、軸支部5
a、5b、5cにおいて抵抗体に軸支されるとともに低
融点合金6a、6b、6bによって抵抗体に固着されて
いる。この例では抵抗体3a、3b、3cに屈曲タイプ
を使用しており、三相の溶断部2a、2b、2cが互い
に近接配置される構造を示している。具体的には図示の
通り、抵抗体の一部を略U字状に屈曲し、このU字状の
水平部に溶断部を設けた構成である。7は密閉容器の一
部を構成する両側の絶縁部材、8は絶縁部材に設けたス
リーブで、各相のヒューズエレメントの接続端子1a、
1b、1cを内端部において接続するとともに外端部に
リード線を接続するようにしている。すなわち、三相ヒ
ューズエレメントは両端の接続端子をスリーブに接続し
て密閉容器内に内蔵する構成となっている。また、符号
9は絶縁部材7に一端を固着した絶縁パイプで、例えば
ガラス、磁器等からなり、一次側の抵抗体3a、3b、
3cの接続端を囲撓しており、絶縁部材7から突出する
内端の肉厚を増大させている。これは連動遮断完了後の
絶縁抵抗を向上させ迅速確実に遮断を完了させるためで
ある。すなわち、溶断部2a、2b、2cの溶断後にお
いてアーク短絡が継続して抵抗体が一次側方向に溶け込
み絶縁パイプの内部にまで溶け込むが、この絶縁パイプ
の存在によって空間距離、沿面距離が大きくとれ、ま
た、絶縁パイプによってアークが冷却されて相間および
極間の絶縁性が急速に増し、速やかに消弧完了する構成
となっている。また、内端の肉厚を増大させたのは沿面
距離の増加を図るとともに吹き付けられたアークが絶縁
部材に直接当たらない影の部分を設けるためである。FIG. 2 is a perspective view showing an example of a three-phase simultaneous cutoff fuse together with another example of a fuse element, and 3a, 3b, 3c.
Is a resistor having fusing parts 2a, 2b, 2c having a cross-sectional area suitable for the rated current, and 4a, 4b, 4c are the resistors at the positions from the secondary side (right side of the drawing) of the fusing part. Is a conductive arm rotatably provided as
The bearings a, 5b, and 5c are axially supported by the resistors, and are fixed to the resistors by the low melting point alloys 6a, 6b, and 6b. In this example, the bending type is used for the resistors 3a, 3b, 3c, and the three-phase fusing parts 2a, 2b, 2c are arranged close to each other. Specifically, as shown in the drawing, a part of the resistor is bent into a substantially U shape, and a melting portion is provided in the U-shaped horizontal portion. Reference numeral 7 is an insulating member on both sides forming a part of the closed container, 8 is a sleeve provided on the insulating member, and is a connecting terminal 1a of the fuse element of each phase,
1b and 1c are connected at the inner end and lead wires are connected to the outer end. That is, the three-phase fuse element has a structure in which the connection terminals at both ends are connected to the sleeve and is incorporated in the closed container. Further, reference numeral 9 is an insulating pipe having one end fixed to the insulating member 7, and is made of, for example, glass, porcelain, or the like, and has primary side resistors 3a, 3b,
The connection end of 3c is bent to increase the thickness of the inner end protruding from the insulating member 7. This is to improve the insulation resistance after completion of the interlocking interruption and to complete the interruption quickly and surely. That is, after the fusing parts 2a, 2b, 2c are blown, an arc short circuit continues and the resistor melts in the primary side direction and even melts into the inside of the insulating pipe. Moreover, the arc is cooled by the insulating pipe, the insulation between the phases and between the electrodes is rapidly increased, and the extinction of the arc is completed quickly. Further, the reason why the wall thickness of the inner end is increased is to increase the creepage distance and to provide a shadow portion where the blown arc does not directly hit the insulating member.
上記のように抵抗体の一部を略U字状に屈曲し、このU
字状の水平部に溶断部を設けたヒューズエレメントおよ
びヒューズでは、第3図に示すように、電流Iが流れる
と、フレミングの左手の法則により溶断部2a、2b、
2c近くの垂直部の回りに磁界Hが形成されるとともに
溶断部において発生したアークを他相方向に駆動する力
Fが働くため、相間短絡が強制的かつ確実に行われる構
成となっている。As described above, part of the resistor is bent into a substantially U shape, and this U
In the fuse element and the fuse in which the fusing part is provided in the horizontal portion of the character shape, as shown in FIG. 3, when the current I flows, the fusing parts 2a, 2b,
A magnetic field H is formed around the vertical portion near 2c, and a force F that drives the arc generated in the fusing portion in the other phase direction acts, so that the inter-phase short circuit is forcedly and reliably performed.
第4図はヒューズエレメントのさらに他の例とともに三
相同時遮断ヒューズの他例を示すもので、上記第2図の
例とは、抵抗体および溶断部の構成を若干異にしてい
る。FIG. 4 shows another example of the three-phase simultaneous cutoff fuse together with still another example of the fuse element. The structure of the resistor and the fusing part is slightly different from the example of FIG.
すなわち、この例では抵抗体3a、3b、3cの一次側
を板状とし、略U字状屈曲部も板状に構成するとともに
板状水平部に小孔10を設けて溶断部2a、2b、2c
を構成している。すなわち、小孔10によって初期発弧
部を限定して溶断部を構成したものである。このように
抵抗体の一次側に位置する部分を板状とすると、その板
厚、板幅を変えることによりアークが発生したときの溶
け込み速度を変化させることができる。That is, in this example, the primary sides of the resistors 3a, 3b, 3c are plate-shaped, the substantially U-shaped bent portion is also plate-shaped, and the plate-shaped horizontal portion is provided with a small hole 10 to form the fusing portions 2a, 2b ,. 2c
Are configured. That is, the fusing portion is configured by limiting the initial arcing portion by the small hole 10. When the portion of the resistor located on the primary side is plate-shaped as described above, the melting speed when an arc is generated can be changed by changing the plate thickness and the plate width.
断面積を一定とした場合、板厚を小さく板幅を大きくと
ると溶け込み速度が増し、逆に丸棒状にすると溶け込み
速度が遅くなる。これを利用して三相とも確実に溶断し
た後、速やかに消弧完了するためには板状として溶け込
みを速め、溶け込みを必要としない導電性アーム4a、
4b、4cの取付部分は丸棒状として最小限の溶け込み
としたものである。When the cross-sectional area is constant, the penetration speed increases when the plate thickness is reduced and the plate width is increased, and conversely, the penetration speed is decreased when the plate shape is round. Utilizing this, the three phases are surely melted, and in order to complete the extinguishing of the arc quickly, the plate-shaped conductive arm 4a accelerates the melting, and the conductive arm 4a does not require the melting.
The mounting portions 4b and 4c are round rods with a minimum of penetration.
第5図は、導電性アームに対して他相と短絡する方向に
回動する弾発力を付与するための構造例を示すもので、
抵抗体3a、3b、3cに別途バネ受けアーム11を取
り付け、導電性アーム4a、4b、4cとの間に圧縮コ
イルスプリング12を保持させた例を示している。FIG. 5 shows an example of a structure for imparting an elastic force to the conductive arm so as to rotate in a direction of short-circuiting with another phase.
An example is shown in which the spring receiving arm 11 is separately attached to the resistors 3a, 3b, 3c and the compression coil spring 12 is held between the resistors 3a, 3b, 3c and the conductive arms 4a, 4b, 4c.
なお、これは単に一例を示すのみであり、バネ受けアー
ムを設けなくとも導電性アームに回動力を付与する構成
であれば良い。例えば、ネジリコイルバネを抵抗体に巻
装し、一端を密閉容器内壁に当接し他端を導電性アーム
に当接する構造、絶縁部材7から補助アームを突設し、
引っ張りコイルバネを装架する構造等各種の構成が採用
できる。It should be noted that this is merely an example, and the structure may be such that the rotating arm is applied to the conductive arm without providing the spring receiving arm. For example, a structure in which a torsion coil spring is wound around a resistor, one end contacts the inner wall of the closed container, and the other end contacts the conductive arm, an auxiliary arm is projected from the insulating member 7,
Various configurations such as a structure for mounting a tension coil spring can be adopted.
[発明の効果] 以上の通り、この発明に係る三相同時遮断用ヒューズエ
レメントおよび三相同時遮断ヒューズは、大電流域は溶
断部におけるアーク短絡によって三相同時遮断させると
共に、小中電流域では低融点合金の溶融による導電性ア
ームの回動によって相間短絡を強制的に生起させ、短絡
大電流によって溶断部が発弧しアーク短絡により三相同
時遮断させる構成としたので、すべての電流域において
動作が確実であり、欠相運転、異常電圧の発生を防止で
きるものである。[Effects of the Invention] As described above, the fuse element for three-phase simultaneous interruption and the three-phase simultaneous interruption fuse according to the present invention simultaneously interrupt three phases in the large current region by arc short circuit in the fusing part, and in the small and medium current regions. Since the interphase short circuit is forcibly caused by the rotation of the conductive arm due to the melting of the low melting point alloy, and the fusing part is ignited by the large short circuit current, and the three phases are simultaneously interrupted by the arc short circuit, so in all current regions The operation is reliable, and the open phase operation and the occurrence of abnormal voltage can be prevented.
抵抗体を部分的に屈曲して三相の溶断部を近接配置した
構成では、溶断部におけるアーク短絡が確実となる。In the configuration in which the resistor is partially bent and the three-phase fusing parts are arranged close to each other, an arc short circuit at the fusing part is ensured.
また、略U字状に屈曲して、その水平部に溶断部を設け
た構成ではアークを他相に駆動する力が働くためアーク
短絡がさらに保証されている。Further, in the structure in which the arc is bent in a substantially U shape and the horizontal portion is provided with the fusing part, the force for driving the arc to another phase works, so that the arc short circuit is further guaranteed.
すなわち、この発明によって三相がほぼ同時に連動遮断
される三相同時遮断用ヒューズエレメントおよび三相同
時遮断ヒューズを提供し得たものであり、三相三線式や
三相四線式等の低圧配電線路の保護に最適である。That is, according to the present invention, it is possible to provide a fuse element for three-phase simultaneous interruption and a three-phase simultaneous interruption fuse in which three phases are interlocked and interrupted at almost the same time, and a low-voltage power distribution such as a three-phase three-wire type or a three-phase four-wire type. Ideal for protecting railway tracks.
第1図は、この発明に係る三相同時遮断用ヒューズエレ
メントの一実施例を示す斜視図、 第2図は、ヒューズエレメントの他例とこのヒューズエ
レメントを用いた三相同時遮断ヒューズの一例を示す斜
視図、 第3図は、同ヒューズエレメントにおける溶断部構造を
示す斜視図、 第4図は、ヒューズエレメントのさらに他の例と三相同
時遮断ヒューズの他実施例を示す斜視図、 第5図は、導電性アームに対する弾発力の付与例を示す
説明図、 第6図は、従来の三相同時遮断ヒューズの一例を示す断
面図である。 1a、1b、1c……接続端子 2a、2b、2c……溶断部 3a、3b、3c……抵抗体 4a、4b、4c……導電性アーム 5a、5b、5c……軸支部 6a、6b、6b……低融点合金 7……絶縁部材、8……スリーブ 9……絶縁パイプ、10……小孔FIG. 1 is a perspective view showing an embodiment of a fuse element for three-phase simultaneous breaking according to the present invention, and FIG. 2 is another example of a fuse element and an example of a three-phase simultaneous breaking fuse using this fuse element. 3 is a perspective view showing a fusing part structure in the fuse element, FIG. 4 is a perspective view showing still another example of the fuse element and another embodiment of the three-phase simultaneous cutoff fuse, FIG. FIG. 6 is an explanatory view showing an example of applying elastic force to a conductive arm, and FIG. 6 is a sectional view showing an example of a conventional three-phase simultaneous cutoff fuse. 1a, 1b, 1c ... Connection terminals 2a, 2b, 2c ... Fusing part 3a, 3b, 3c ... Resistors 4a, 4b, 4c ... Conductive arms 5a, 5b, 5c ... Shaft support parts 6a, 6b, 6b ... Low melting point alloy 7 ... Insulation member, 8 ... Sleeve 9 ... Insulation pipe, 10 ... Small hole
───────────────────────────────────────────────────── フロントページの続き (72)発明者 平田 裕士 大阪府大阪市中央区本町3丁目2番6号 大阪ヒューズ株式会社内 (72)発明者 森北 幸康 大阪府大阪市中央区本町3丁目2番6号 大阪ヒューズ株式会社内 (56)参考文献 実開 平1−111447(JP,U) 実開 昭48−220(JP,U) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Hirata 3-2-6 Honmachi, Chuo-ku, Osaka-shi, Osaka Prefecture Osaka Hughes Co., Ltd. (72) Yukiya Morikita 3-2 Honmachi, Chuo-ku, Osaka No. 6 in Osaka Hughes Co., Ltd. (56) References Actual Opening 1-11-1447 (JP, U) Actual Opening 48-220 (JP, U)
Claims (6)
積の三相短絡溶断部を有する抵抗体を接続し、この溶断
部より二次側寄りの位置において、各々の抵抗体を軸と
して回動可能な導電性アームを設け、この導電性アーム
の軸支部を低融点金属で抵抗体に固着するとともに、導
電性アームにそのアーム端が隣接した他相と接触する方
向に回動する弾発力を付与してなる三相同時遮断用ヒュ
ーズエレメント。1. A resistor having a three-phase short circuit fusing part having a cross-sectional area suitable for the rated current is connected between three pairs of connection terminals, and each resistor is placed at a position closer to the secondary side than the fusing part. A conductive arm that can rotate as an axis is provided, the shaft support of this conductive arm is fixed to the resistor with a low melting point metal, and the conductive arm rotates in the direction in which its arm end contacts another phase adjacent to it. A fuse element for three-phase simultaneous disconnection that gives an elastic force to
が互いに近接配置されている請求項1記載の三相同時遮
断用ヒューズエレメント。2. The fuse element for simultaneous three-phase interruption according to claim 1, wherein the resistor is partially bent and the three-phase fusing parts are arranged close to each other.
U字状の水平部に溶断部が設けられている請求項2記載
の三相同時遮断用ヒューズエレメント。3. A fuse element for simultaneous three-phase disconnection according to claim 2, wherein a part of the resistor is bent into a substantially U shape, and a melting portion is provided on the horizontal portion of the U shape.
の水平部に小孔を設けて溶断部が形成されている請求項
1記載の三相同時遮断用ヒューズエレメント。4. A fuse element for simultaneous three-phase interruption according to claim 1, wherein the substantially U-shaped bent portion is plate-shaped, and a fusing portion is formed by providing a small hole in the U-shaped horizontal portion.
遮断用ヒューズエレメントを使用した三相同時遮断ヒュ
ーズにおいて、密閉容器の両端にリード線接続用の三相
のスリーブを設け、両端の接続端子を各相のスリーブに
接続して三相同時遮断用ヒューズエレメントを密閉容器
内に内蔵してなる三相同時遮断ヒューズ。5. A three-phase simultaneous breaking fuse using the fuse element for simultaneous three-phase breaking according to claim 1, 2, 3 or 4, wherein three-phase sleeves for connecting lead wires are provided at both ends of a hermetically sealed container, A three-phase simultaneous cutoff fuse in which the connecting terminals at both ends are connected to sleeves for each phase and a fuse element for three-phase simultaneous cutoff is built in a sealed container.
端を固着した絶縁パイプで一次側の抵抗体の接続端を囲
繞してなる請求項5記載の三相同時遮断ヒューズ。6. A three-phase simultaneous cutoff fuse according to claim 5, wherein the connecting ends of the resistors on the primary side are surrounded by an insulating pipe having one end fixed to insulating members constituting both sides of the closed container.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2046464A JPH0648615B2 (en) | 1990-02-26 | 1990-02-26 | Fuse element for simultaneous three-phase interruption and three-phase simultaneous interruption fuse |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2046464A JPH0648615B2 (en) | 1990-02-26 | 1990-02-26 | Fuse element for simultaneous three-phase interruption and three-phase simultaneous interruption fuse |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH03250523A JPH03250523A (en) | 1991-11-08 |
JPH0648615B2 true JPH0648615B2 (en) | 1994-06-22 |
Family
ID=12747891
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2046464A Expired - Lifetime JPH0648615B2 (en) | 1990-02-26 | 1990-02-26 | Fuse element for simultaneous three-phase interruption and three-phase simultaneous interruption fuse |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0648615B2 (en) |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS529554Y2 (en) * | 1971-05-26 | 1977-02-28 | ||
JPH0526688Y2 (en) * | 1988-01-20 | 1993-07-06 |
-
1990
- 1990-02-26 JP JP2046464A patent/JPH0648615B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH03250523A (en) | 1991-11-08 |
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