JPH01146222A - Fuse - Google Patents
FuseInfo
- Publication number
- JPH01146222A JPH01146222A JP30431687A JP30431687A JPH01146222A JP H01146222 A JPH01146222 A JP H01146222A JP 30431687 A JP30431687 A JP 30431687A JP 30431687 A JP30431687 A JP 30431687A JP H01146222 A JPH01146222 A JP H01146222A
- Authority
- JP
- Japan
- Prior art keywords
- current
- lead wire
- fuse
- motor
- density
- 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
- 239000000463 material Substances 0.000 claims abstract description 13
- 239000004576 sand Substances 0.000 claims abstract description 6
- 238000009413 insulation Methods 0.000 claims description 4
- 238000004804 winding Methods 0.000 abstract description 32
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 abstract 10
- 239000000126 substance Substances 0.000 abstract 1
- 239000004020 conductor Substances 0.000 description 13
- 238000010586 diagram Methods 0.000 description 7
- 239000002887 superconductor Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 4
- 241000287828 Gallus gallus Species 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000032696 parturition Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
- H01H85/05—Component parts thereof
- H01H85/055—Fusible members
- H01H85/06—Fusible members characterised by the fusible material
Landscapes
- Fuses (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
(産業上の利用分野)
本発明はヒユーズであって、特に回路投入瞬時に大電流
が流れるモータ回路、白熱灯回路等における配線を保護
するために用いるヒユーズに関する。[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention relates to a fuse, which is particularly useful for protecting wiring in motor circuits, incandescent lamp circuits, etc., through which a large current flows instantly when the circuit is turned on. Regarding the fuse used.
(従来の技術)
モータ回路を保護するために従来用いられていたヒユー
ズについて、第8図を参照し説明する。(Prior Art) A fuse conventionally used to protect a motor circuit will be explained with reference to FIG.
モータに流れる起動電流の時間に対する変化(以下モー
タ起動電流特性という)を曲線21に示す。A curve 21 shows changes in the starting current flowing through the motor over time (hereinafter referred to as motor starting current characteristics).
このようにモータの起動時には、定格負荷電流の10倍
前後の大きさの起動電流が数百ミリ秒程度の短時間にお
いて流れる。このモータの巻線に流しうる最大の電流値
の時間に対する変化(以下モータの巻線許容電流時間特
性という)を曲線22に示す。As described above, when starting the motor, a starting current approximately 10 times as large as the rated load current flows for a short period of about several hundred milliseconds. A curve 22 shows a change over time in the maximum current value that can be passed through the motor windings (hereinafter referred to as motor winding allowable current time characteristics).
この場合において、ヒユーズが溶断することなく確実に
流しうる電流の最大値の時間に対する変化(以下ヒユー
ズの許容電流時間特性という)を表わす曲線が、モータ
起動電流特性を表わす曲線21を常に上回るような場合
には、ヒユーズが溶断する限界の電流値の時間に対する
変化(以下ヒユーズの限界電流時間特性という)は曲線
24のようなものとなり、モータの巻線許容電流時間特
性を表わす曲線22を上回る。このためモータの巻線が
許容する電流を上回る電流が流れうることとなり、モー
タの巻線はこのようなヒユーズでは保護されない。逆に
ヒユーズの限界電流時間特性を表わす曲線23がモータ
の巻線許容電流時間特性を表わす曲線22を常に下回る
ような場合には、ヒユーズの許容電流時間特性は曲線2
6のようなものとなり、モータ起動電流特性を表わす曲
線21を下回る。このためモータを起動させようとする
と、正常な起動電流であってもヒユーズが溶断してしま
い、モータ起動電流を支障なく通電することができない
こととなる。In this case, the curve representing the change over time in the maximum value of current that can be reliably passed through the fuse without blowing out (hereinafter referred to as allowable current-time characteristics of the fuse) always exceeds the curve 21 representing the motor starting current characteristics. In this case, the change over time in the limit current value at which the fuse blows (hereinafter referred to as the limit current-time characteristic of the fuse) becomes like a curve 24, which exceeds the curve 22 representing the permissible current-time characteristic of the motor windings. This allows currents to flow in excess of what the motor windings will allow, and the motor windings are not protected by such fuses. Conversely, if the curve 23 representing the fuse's limit current-time characteristics is always lower than the curve 22 representing the motor's winding allowable current-time characteristics, the fuse's allowable current-time characteristics will be curve 2.
6, which is below the curve 21 representing the motor starting current characteristic. Therefore, when an attempt is made to start the motor, the fuse blows even if the starting current is normal, and the motor starting current cannot be passed without any problem.
従って、ヒユーズがモータの巻線を保護できると同時に
モータ起動電流を支障なく通電できるためには、ヒユー
ズの限界電流時間特性を表わす曲線がどの瞬時において
もモータの巻線許容電流時間特性を表わす曲線22より
も下回り、さらにヒユーズの許容電流時間特性を表わす
曲線がどの瞬時においてもモータ起動電流特性を表わす
曲線21を上回らなければならない。Therefore, in order for the fuse to be able to protect the motor windings and at the same time allow the motor starting current to pass without any trouble, the curve representing the limit current-time characteristics of the fuse must always be the same as the curve representing the allowable current-time characteristics of the motor windings. 22, and the curve representing the permissible current-time characteristic of the fuse must at any moment exceed the curve 21 representing the motor starting current characteristic.
(発明が解決しようとする問題点)
しかし、ヒユーズにこのような特性を持たせることは非
常に困難である。このためモータ起動電流を支障なく通
電させるためには事実上モータの巻線をヒユーズによっ
て保護することはできず、短絡電流を遮断することのみ
を目的としたヒユーズを使用せざるをえなかった。従っ
てモータの巻線が過負荷によって絶縁劣化し、あるいは
この絶縁劣化によってショートした場合にはモータが焼
損し、モータ自体を交換しなければならないという問題
点があった。(Problem to be Solved by the Invention) However, it is extremely difficult to provide a fuse with such characteristics. For this reason, in order to pass the motor starting current without any problems, it is practically impossible to protect the motor windings with a fuse, and it is necessary to use a fuse whose sole purpose is to interrupt the short-circuit current. Therefore, if the insulation of the motor windings deteriorates due to overloading, or if a short circuit occurs due to this insulation deterioration, the motor burns out and the motor itself has to be replaced.
このようなヒユーズを用いてモータの巻線の保護を図る
には、許容電流の大きい巻線径の太い巻線をモータに用
いざるを得ず、モータが大型化、重量化し、コストも高
くなるという問題点があった。In order to protect the motor windings using such a fuse, it is necessary to use thick winding diameter windings with a large allowable current in the motor, which increases the size and weight of the motor and increases its cost. There was a problem.
本発明は上記事情に鑑み、回路投入瞬時に大電流が流れ
るモータ回路等における起動電流を支障なく通電でき、
しかもモータの巻線等を保護しうると同時に、回路の小
型軽量化、コストの低減を図ることのできるヒユーズを
提供することを目的とする。In view of the above circumstances, the present invention allows the starting current to flow in a motor circuit, etc., in which a large current flows instantaneously when the circuit is turned on, without any hindrance.
Moreover, it is an object of the present invention to provide a fuse that can protect the windings of a motor, etc., and at the same time, reduce the size and weight of the circuit and reduce costs.
(問題点を解決するための手段)
上記目的は、絶縁性を有する絶縁筒と、前記絶縁筒の両
端に取り付けられた電極と、前記絶縁筒の内部で前記電
極の間を接続し直線部分とその直線部分を囲むように巻
かれたコイル部分とを有し超電導材料で作られた導線と
、前記絶縁筒の内部に充填され、前記導線が溶融した場
合に前記電極の間の通電を断つ消弧砂とを備えたことを
特徴とするヒユーズによって達成される。(Means for Solving the Problems) The above object is to connect an insulating cylinder having insulation properties, an electrode attached to both ends of the insulating cylinder, and a straight portion between the electrodes inside the insulating cylinder. A conductive wire made of a superconducting material and having a coil portion wound around a straight portion of the conductive wire; This is achieved by a fuse characterized by having arc sand.
(作 用)
ヒユーズの導線に電流が流れると、導線のコイル部分の
周囲に磁界が発生する。この磁界の影響を、導線のコイ
ル部分に囲まれた直線部分が受けて、臨界電流密度が低
下する。導線に流れる電流の密度がこの臨界電流密度に
達すると、導線が超電導状態から常電導状態となり、導
線に電気抵抗が発生して電流が減少する。電流が減少し
導線に流れる電流の密度が臨界電流密度より下回ると、
導線が常電導状態から超電導状態となり、導線の電気抵
抗はゼロとなる。(Operation) When current flows through the fuse conductor, a magnetic field is generated around the coil portion of the conductor. The linear portion of the conducting wire surrounded by the coil portion is affected by this magnetic field, and the critical current density decreases. When the density of the current flowing through the conducting wire reaches this critical current density, the conducting wire changes from a superconducting state to a normal conducting state, electrical resistance is generated in the conducting wire, and the current decreases. When the current decreases and the density of the current flowing through the conductor falls below the critical current density,
The conductor changes from a normal conducting state to a superconducting state, and the electrical resistance of the conducting wire becomes zero.
(実施例) 以下、本発明を図示する実施例に基づいて詳述する。(Example) Hereinafter, the present invention will be described in detail based on illustrated embodiments.
まず、本発明の一実施例によるヒユーズについて、第1
図を参照し説明する。絶縁筒2の両端に電極3,3′が
取り付けられ、電極3と電極3′との間を例えばBa
YCu3069やB a 2E u 9 Y t Cu
a 069等の超電導材料で作られた導線5が接続し
ている。導線5は、直線部分5aとこの直線部分5aを
囲むように巻かれたコイル部分5bとを有している。絶
縁筒2の内部には、絶縁性を有する粒状物から成り、導
線が溶融した場合にその溶融物を眼前することによって
電極3と電極3′との間の通電を完全に断つ機能を有す
る消弧砂4が充填されている。ここで、本発明のヒユー
ズは導体4に用いられている超電導材料の臨界温度以下
の周囲温度で使用されるものとする。First, regarding the fuse according to one embodiment of the present invention, the first
This will be explained with reference to the figures. Electrodes 3 and 3' are attached to both ends of the insulating cylinder 2, and a conductor of, for example, Ba is attached between the electrodes 3 and 3'.
YCu3069 and B a 2E u 9 Y t Cu
A conductive wire 5 made of superconducting material such as A069 is connected. The conductive wire 5 has a straight portion 5a and a coil portion 5b wound around the straight portion 5a. Inside the insulating tube 2, there is a fire extinguisher made of insulating granular material, which has the function of completely cutting off the current flow between the electrodes 3 and 3' by exposing the conductor to the melted material. It is filled with arc sand 4. Here, it is assumed that the fuse of the present invention is used at an ambient temperature below the critical temperature of the superconducting material used for the conductor 4.
一般に超電導体は第2図に示されるように、流れる電流
の断面積当たりの密度が臨界電流密度Jc以上になると
、超電導の特性をもたなくなり、抵抗が発生する。その
臨界電流密度Jcは第3図に示されるように、超電導体
に加わる磁界の強さによって変化する。磁界が強い程臨
界電流密度Jcは低下する。Generally, as shown in FIG. 2, when the density per cross-sectional area of a flowing current exceeds the critical current density Jc, a superconductor loses its superconducting properties and develops resistance. As shown in FIG. 3, the critical current density Jc changes depending on the strength of the magnetic field applied to the superconductor. The stronger the magnetic field, the lower the critical current density Jc.
次に、超電導材料から作られたヒユーズの電流時間特性
について、以下に説明する。それぞれ磁界がかけられて
いない場合の電流時間特性を第4図に、磁界がかけられ
ている場合の電流時間特性を第5図に示す。第4図及び
第5図において、モータの巻線許容電流時間特性を表わ
す曲線を曲線27、超電導体の臨界電流密度を超える電
流が流れて抵抗が発生した常電導状態のときのヒユーズ
の限界電流時間特性を表わす曲線を曲線28、ヒユーズ
の許容電流時間特性を表わす曲線を曲線29とする。Next, the current-time characteristics of a fuse made from a superconducting material will be explained below. FIG. 4 shows the current-time characteristics when no magnetic field is applied, and FIG. 5 shows the current-time characteristics when a magnetic field is applied. In Figures 4 and 5, the curve 27 represents the allowable current-time characteristics of the motor windings, and the limit current of the fuse in the normal conduction state where a current exceeding the critical current density of the superconductor flows and resistance is generated. A curve representing the time characteristics is a curve 28, and a curve representing the allowable current time characteristics of the fuse is a curve 29.
超電導体に磁界がかけられていない場合の臨界電流密度
Jcに断面積aをかけた臨界電流値Jc・aを第4図に
直線31として示す。電流が流れ始めてから時間T1ま
での間は、ヒユーズの限界電流時間特性を示す曲線28
を超える電流が流れると超電導体が常電導体となり発生
した抵抗によって発熱してヒユーズが溶断する。これに
よりモータの巻線は保護されることとなる。しかし時間
T1を超えると、電流がJc−aを超えない限り超電導
状態となり、抵抗がなくなり発熱しないため曲線28を
超える電流が流れてもヒユーズは溶断しない。従ってこ
の場合には、モータの巻線許容電流時間特性を表わす曲
線27を超える電流が流れつるため、モータの巻線は保
護されないことになる。A critical current value Jc·a obtained by multiplying the critical current density Jc by the cross-sectional area a when no magnetic field is applied to the superconductor is shown as a straight line 31 in FIG. During the period from when the current starts flowing until time T1, a curve 28 showing the limit current-time characteristics of the fuse
When a current exceeding the current flows, the superconductor becomes a normal conductor and the generated resistance generates heat and blows the fuse. This protects the motor windings. However, after time T1, as long as the current does not exceed Jc-a, the superconducting state occurs and there is no resistance and no heat is generated, so even if a current exceeding curve 28 flows, the fuse will not blow out. Therefore, in this case, a current exceeding the curve 27 representing the allowable current-time characteristics of the motor windings continues to flow, so that the motor windings are not protected.
超電導体に磁界がかけられると、臨界電流密度Jcは減
少した値Jc′となり、この場合の断面faaをかけた
臨界電流値Jc’ ・aを第5図に直線31′ とし
て示す。このJ c I ・aの値は、導線5のコイ
ル部分5bの巻数を変えて直線部分5bにかける磁界の
強さを変えることによって自由に変えることができる。When a magnetic field is applied to the superconductor, the critical current density Jc becomes a reduced value Jc', and the critical current value Jc'·a multiplied by the cross section faa in this case is shown as a straight line 31' in FIG. The value of J c I ·a can be freely changed by changing the number of turns of the coil portion 5b of the conducting wire 5 and changing the strength of the magnetic field applied to the straight portion 5b.
そこでJ c/ ・aの値を第5図のように、J c
/ ・aが常電導状態におけるヒユーズの許容電流
時間特性を表わす曲線29よりわずかに下回るように設
定する。これにより、ヒユーズの限界電流時間特性を表
わす曲線28より大きい電流が流れた場合にはどの瞬時
においてもヒユーズが溶断するため、モータの巻線許容
電流時間特性を表わす曲線27より大きい電流は流れず
、モータの巻線は保護されることとなる。Therefore, the value of J c / ・a is set as shown in Figure 5, J c
/・a is set to be slightly below the curve 29 representing the allowable current-time characteristics of the fuse in the normal conduction state. As a result, if a current larger than the curve 28 representing the limit current-time characteristics of the fuse flows, the fuse will melt at any instant, so a current larger than the curve 27 representing the motor winding allowable current-time characteristics will not flow. , the motor windings will be protected.
次に、このようなヒユーズの限界電流時間特性とモータ
の起動電流特性との関係について第6図を参照し説明す
る。Next, the relationship between the limit current time characteristics of such a fuse and the starting current characteristics of the motor will be explained with reference to FIG.
第4図、第5図と同様に、モータの巻線許容電流時間特
性を表わす曲線を曲線27、常電導状態のときのヒユー
ズの限界電流時間特性を表わす曲線を曲線28、ヒユー
ズの許容電流時間特性を表わす曲線2つとする。さらに
導線5のコイル部分5bの巻数を変えることによって直
線部分5aに加えられる磁界の強さを調整し、臨界電流
値J c / ・aがヒユーズの許容電流時間特性を
示す曲線29よりわずかに下回るように設定する。モー
タに起動電流32が流れると、ヒユーズの導線5が常に
超電導状態であれば、−点鎖線で示す起動電流32′の
ように流れるため、ヒユーズの限界電流時間特性を表わ
す曲線28を超えてヒユーズが溶断する。しかし、磁界
が加えられて臨界電流値がJ c / ・aの値に低
下する。これにより、モータの起動電流32がこのJ
c / ・aの値を超えると導線5に抵抗が生じるた
め電流が限流されて実線で示す起動電流32″のように
流れる。このため、モータの起動電流32はヒユーズの
許容電流時間特性を表わす曲線29を超えず、ヒユーズ
は溶断しない。従ってこのヒユーズは、モータの起動電
流を支障なく通電し、しかもモータの巻線を保護するこ
とになる。Similarly to FIGS. 4 and 5, curve 27 represents the allowable current-time characteristics of the motor windings, curve 28 represents the limit current-time characteristics of the fuse in the normal conduction state, and curve 28 represents the allowable current-time characteristics of the fuse. Assume that there are two curves representing the characteristics. Furthermore, by changing the number of turns of the coil portion 5b of the conductor 5, the strength of the magnetic field applied to the straight portion 5a is adjusted, and the critical current value J c / · a is slightly lower than the curve 29 indicating the allowable current-time characteristics of the fuse. Set it as follows. When the starting current 32 flows through the motor, if the fuse conductor 5 is always in a superconducting state, the starting current 32' flows as shown by the - dotted chain line, and therefore the fuse exceeds the curve 28 representing the limit current-time characteristic of the fuse. melts. However, when a magnetic field is applied, the critical current value decreases to a value of J c /·a. As a result, the starting current 32 of the motor becomes this J
When the value of c/・a is exceeded, resistance is generated in the conductor 5, so the current is limited and flows as the starting current 32'' shown by the solid line.For this reason, the starting current 32 of the motor depends on the allowable current-time characteristics of the fuse. The curve 29 shown is not exceeded and the fuse does not blow out.The fuse therefore carries the motor starting current without any problem and protects the motor windings.
仮に、モータ起動電流よりもモータの巻線許容電流が下
回るような巻線をモータに用いた場合には、モータの小
型軽量化を図ることはできるが、従来のヒユーズを用い
たのでは起動電流が流れると巻線がショートして使用に
値しないことになる。If the motor uses windings in which the allowable motor winding current is lower than the motor starting current, the motor can be made smaller and lighter, but if a conventional fuse is used, the starting current will be lower than the starting current. If the current flows, the windings will short out and become unusable.
しかし第7図に示されるように、モータの起動電流33
が従来のヒユーズを用いたのでは一点鎖線で示された起
動電流33′のように流れるところを、本実施例のヒユ
ーズを用いた場合には第6図を参照して説明したように
実線で示された起動電流33″のように限流された電流
が流れる。これにより、モータの巻線許容電流時間特性
を示す曲線27は勿論ヒユーズの許容電流時間特性を示
す曲線29をも下回る電流しか流れず、モータの巻線は
保護されることとなる。However, as shown in FIG. 7, the motor starting current 33
When the conventional fuse is used, the starting current flows as shown by the dashed line 33', but when the fuse of this embodiment is used, the starting current flows as a solid line as explained with reference to FIG. A limited current flows, such as the starting current 33'' shown.As a result, only a current that is lower than the curve 27 showing the allowable current-time characteristics of the motor windings as well as the curve 29 showing the allowable current-time characteristics of the fuse flows. No flow will occur and the motor windings will be protected.
このように本実施例のヒユーズは、モータの起動電流を
支障なく通電でき、ざらにモータの巻線も保護すること
ができる。またモータの巻線として、起動電流を無視し
て定格負荷電流を通電することができる範囲内の最小の
径の巻線を用いることができるため、モータの小型軽量
化を図ることができる。In this way, the fuse of this embodiment can pass the starting current of the motor without any trouble, and can also roughly protect the windings of the motor. Moreover, since the windings of the motor can be used with the smallest diameter within the range that allows the rated load current to be passed while ignoring the starting current, the motor can be made smaller and lighter.
本実施例による導線5は、直線部分5aからコイル部分
5bは至る形状として、第1図に示す形状を何している
が、直線部分5aをコイル部分5bが囲む形状であれば
異なる形状であってもよい。消弧砂4は、導線5が溶断
した場合に電極3゜3′の間の通電を断つための絶縁物
として用いることのできる物であれば、いずれを用いて
もよい。The conductor 5 according to this embodiment has the shape shown in FIG. 1 from the straight part 5a to the coil part 5b, but it may have a different shape as long as the straight part 5a is surrounded by the coil part 5b. You can. Any material may be used as the arc-extinguishing sand 4 as long as it can be used as an insulator to cut off current flow between the electrodes 3 and 3' when the conducting wire 5 is fused.
以上説明したように、本発明のヒユーズは導線が超電導
祠料から作られ、その導線の直線部分を囲むように巻か
れたコイル部分が直線部分に磁界を加え、超電導状態か
ら常電導状態へ変化する地点である臨界電流値を変えつ
るようにしたことにより、回路投入瞬時に大電流が流れ
るモータ回路や白熱灯回路における必要な電流を支障な
く流すことができると同時に、モータの巻線等の回路の
保護も可能であり、またモータ等の回路の小型軽量化も
図ることができる。As explained above, in the fuse of the present invention, the conducting wire is made from a superconducting material, and the coil part wound around the straight part of the conducting wire applies a magnetic field to the straight part, changing from a superconducting state to a normal conducting state. By changing the critical current value at the point where the circuit is turned on, it is possible to flow the necessary current in motor circuits and incandescent lamp circuits, where large currents flow instantly when the circuit is turned on, without any hindrance, and at the same time, it is possible to It is also possible to protect circuits, and it is also possible to reduce the size and weight of circuits such as motors.
第1図は本発明の一実施例によるヒユーズの断面図、第
2図は超電導材料の電流密度と固有抵抗との関係を示す
図、第3図は超電導材料の磁界に対する臨界電流密度の
変化を示す図、第4図は磁界がかけられていない場合に
おける超電導材料で作られたヒユーズの電流時間特性を
示す図、第5図は磁界がかけられている場合における超
電導材料で作られたヒユーズの電流時間特性を示す図、
第6図は本発明の一実施例によるヒユーズの電流時間特
性を示す図、第7図は本発明の一実施例によるヒユーズ
の電流時間特性を示す図、第8図は従来のヒユーズの電
流時間特性を示す図である。
1・・・ヒユーズ、2・・・絶縁筒、3.3′ ・・・
電極、4・・・消弧砂、5・・・導線、5a・・・直線
部分、5b・・・コイル部分、21・・・モータ起動電
流特性、22・・・モータの巻線許容電流時間特性、2
3.24・・・ヒユーズの限界電流時間特性、25.2
6・・・ヒユーズの許容電流時間特性、27・・・モー
タの巻線許容電流時間特性、28・・・ヒユーズの限界
電流時間特性、2つ・・・ヒユーズの許容電流時間特性
、31゜31′・・・臨界電流値、32.32’ 、3
2’・・・モータ起動電流特性、33.33’ 、33
’・・・モータ起動電流特性。
出願人代理人 佐 藤 −雄
鳥1図
為2図 馬3図
馬4図
為5図
為6図
娩7図Figure 1 is a cross-sectional view of a fuse according to an embodiment of the present invention, Figure 2 is a diagram showing the relationship between current density and resistivity of a superconducting material, and Figure 3 is a diagram showing the change in critical current density of a superconducting material with respect to a magnetic field. Figure 4 shows the current-time characteristics of a fuse made of superconducting material when no magnetic field is applied, and Figure 5 shows the current-time characteristics of a fuse made of superconducting material when a magnetic field is applied. Diagram showing current time characteristics,
FIG. 6 is a diagram showing current-time characteristics of a fuse according to an embodiment of the present invention, FIG. 7 is a diagram showing current-time characteristics of a fuse according to an embodiment of the present invention, and FIG. 8 is a diagram showing current-time characteristics of a conventional fuse. FIG. 3 is a diagram showing characteristics. 1... Fuse, 2... Insulating tube, 3.3'...
Electrode, 4... Arc-extinguishing sand, 5... Conductor, 5a... Straight portion, 5b... Coil portion, 21... Motor starting current characteristics, 22... Motor winding allowable current time Characteristics, 2
3.24...Fuse limit current time characteristics, 25.2
6... Allowable current time characteristics of fuse, 27... Allowable current time characteristics of motor winding, 28... Limit current time characteristics of fuse, 2... Allowable current time characteristics of fuse, 31° 31 '...Critical current value, 32.32', 3
2'...Motor starting current characteristics, 33.33', 33
'...Motor starting current characteristics. Applicant's agent Sato - Rooster 1 figure and figure 2 figures Horse 3 figure Horse 4 figure and figure 5 figure and figure 6 figure and parturition 7 figure
Claims (1)
られた電極と、前記絶縁筒の内部で前記電極の間を接続
し直線部分とその直線部分を囲むように巻かれたコイル
部分とを有し超電導材料で作られた導線と、前記絶縁筒
の内部に充填され前記導線が溶断した場合に前記電極の
間の通電を断つ消弧砂とを備えたことを特徴とするヒュ
ーズ。An insulating cylinder having insulation properties, electrodes attached to both ends of the insulating cylinder, a straight part connecting the electrodes inside the insulating cylinder, and a coil part wound around the straight part. 1. A fuse comprising: a conductive wire made of a superconducting material; and arc-extinguishing sand that is filled inside the insulating cylinder and cuts off current flow between the electrodes when the conductive wire is fused.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30431687A JPH01146222A (en) | 1987-12-01 | 1987-12-01 | Fuse |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30431687A JPH01146222A (en) | 1987-12-01 | 1987-12-01 | Fuse |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH01146222A true JPH01146222A (en) | 1989-06-08 |
Family
ID=17931559
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP30431687A Pending JPH01146222A (en) | 1987-12-01 | 1987-12-01 | Fuse |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01146222A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007534981A (en) * | 2004-02-27 | 2007-11-29 | ジェンテックス コーポレイション | Vehicle rearview mirror elements and assemblies incorporating these elements |
-
1987
- 1987-12-01 JP JP30431687A patent/JPH01146222A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007534981A (en) * | 2004-02-27 | 2007-11-29 | ジェンテックス コーポレイション | Vehicle rearview mirror elements and assemblies incorporating these elements |
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