JPH05300642A - Method for limiting and cutting-off circuit current - Google Patents
Method for limiting and cutting-off circuit currentInfo
- Publication number
- JPH05300642A JPH05300642A JP4126645A JP12664592A JPH05300642A JP H05300642 A JPH05300642 A JP H05300642A JP 4126645 A JP4126645 A JP 4126645A JP 12664592 A JP12664592 A JP 12664592A JP H05300642 A JPH05300642 A JP H05300642A
- Authority
- JP
- Japan
- Prior art keywords
- current
- circuit
- fusible material
- fusible body
- wire
- 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
- 238000000034 method Methods 0.000 title claims description 12
- 239000000463 material Substances 0.000 claims abstract description 32
- 230000007704 transition Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 4
- 230000005284 excitation Effects 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 abstract description 3
- 239000010955 niobium Substances 0.000 abstract description 3
- RJSRQTFBFAJJIL-UHFFFAOYSA-N niobium titanium Chemical compound [Ti].[Nb] RJSRQTFBFAJJIL-UHFFFAOYSA-N 0.000 abstract description 3
- 229910001275 Niobium-titanium Inorganic materials 0.000 abstract description 2
- 229910052734 helium Inorganic materials 0.000 abstract description 2
- 239000001307 helium Substances 0.000 abstract description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052758 niobium Inorganic materials 0.000 abstract description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 230000001934 delay Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
Landscapes
- Containers, Films, And Cooling For Superconductive Devices (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は回路電流の限流遮断方
法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for interrupting a current limit of a circuit current.
【０００２】[0002]
【従来の技術】機器の故障などにもとづき、回路に流れ
る過大電流から機器を保護する手段として、従来図３に
示すように回路Ｌと、直列に可熔体（Ｆ）を限流遮断要
素とする限流ヒューズ（ＬＦ）を接続し、過大電流が流
れたとき生ずる可熔体（Ｆ）のもつ抵抗と可熔体（Ｆ）
を流れる電流にもとづくジュール熱により、可熔体
（Ｆ）を熔断発弧させて、機器に流れこむ電流を限流し
て遮断する方法が広く用いられている。2. Description of the Related Art As a means for protecting equipment from excessive current flowing in the circuit due to equipment failure or the like, conventionally, as shown in FIG. Resistance of the fusible material (F) generated when an excessive current flows and the fusible material (F)
A method is widely used in which the meltable material (F) is blown and ignited by Joule heat based on the current flowing through the device to limit and interrupt the current flowing into the device.
【０００３】[0003]
【発明が解決しようとする課題】しかし上記従来の限流
遮断方法では、限流ヒューズ（ＬＦ）が動作する電流及
び動作するまでの時間は、可熔体（Ｆ）の材質や断面積
などによって定まる固有の値である。従って従来の限流
ヒューズによる方法では 動作電流値を変更したい場合には、その都度限流ヒ
ューズ（ＬＦ）を交換する必要があり、動作電流値や動
作するまでの時間を簡単に変更できない。 限流ヒューズの交換によって動作電流値を変更した
場合、例えば可熔体（Ｆ）の断面積を小さくして動作す
る電流を小とした場合には、これに伴い通常通電しうる
電流値も小になるので、使用に当って十分な注意が必要
である。 電流値の小さい領域では、短時間の間に可熔体
（Ｆ）の全長における熔断発弧が行われにくいため、遮
断できない電流がある。このため過電流耐量の小さい機
器の保護が充分でない。 などの解決されなければならない各種の課題をもつ。However, in the above-mentioned conventional current limiting interrupting method, the current and time until the current limiting fuse (LF) operates depends on the material and cross-sectional area of the fusible material (F). It is a unique value that is determined. Therefore, in the conventional method using the current limiting fuse, when it is desired to change the operating current value, it is necessary to replace the current limiting fuse (LF) each time, and the operating current value and the time until the operation cannot be easily changed. If the operating current value is changed by replacing the current limiting fuse, for example, if the cross-sectional area of the fusible material (F) is made small and the operating current is made small, the current value that can be normally energized is also small. Therefore, be careful when using it. In the region where the current value is small, there is a current that cannot be interrupted because it is difficult for the arc to be melted and fired over the entire length of the fusible material (F) in a short time. For this reason, the protection of equipment with a small overcurrent capability is not sufficient. There are various problems that must be solved such as.
【０００４】[0004]
【発明の目的】この発明の目的は、限流ヒューズを交換
することなしに、動作電流及び動作するまでの時間を簡
単かつ自由に選定でき、しかも遮断できない電流領域を
小さくできる限流遮断方法を提案し、機器の確実な保護
動作を期待できるようにしたものである。SUMMARY OF THE INVENTION It is an object of the present invention to provide a current limiting interrupting method in which the operating current and the time until the operation can be easily and freely selected without replacing the current limiting fuse and the current region which cannot be interrupted can be reduced. It was proposed so that reliable protection of equipment can be expected.
【０００５】[0005]
【課題を解決するための本発明の手段】この発明の目的
は次の手段、即ち〔超電導線材により形成された可熔体
を、超電導状態に保持して通常通電すると共に、前記可
熔体の外側に設けられ、かつ外部指令信号または検出さ
れた通常通電電流を上廻る電流の発生時点から、所要時
間後所要電流値の励磁電流が流される磁界発生用コイル
の外部磁界により、前記可熔体の超電導状態を常電導状
態に転移させ、これにより生じた可熔体の抵抗と通電電
流とから可熔体を熔断発弧させる〕手段により達成され
る。The object of the present invention is to provide the following means, namely: [a fusible material formed of a superconducting wire is kept in a superconducting state and normally energized, and The fusible material is provided by an external magnetic field of a magnetic field generating coil which is provided on the outside and in which an exciting current having a required current value flows after a required time has passed from the time of generation of an external command signal or a current exceeding the detected normal energizing current. The superconducting state is changed to the normal conducting state, and the melting and arcing of the fusible material is caused by the resistance of the fusible material and the energizing current generated thereby.
【０００６】[0006]
【作用】上記手段のように、通常通電電流を上廻る電流
の検出時点から所望の時間後、磁界発生用コイルに励磁
電流を流し超電導状態を常電導状態にすれば、可熔体が
動作するまでの時間を簡単かつ自由に選定できる。ま
た、通常通電時でも、必要であれば外部指令信号を用い
て磁界発生用コイルに励磁電流を流すことにより、遮断
動作を行わせることができる。また可熔体を超電導状態
として通常通電すれば可熔体の抵抗値を零、またはこれ
に近い抵抗値として、通常通電できるので、通常通電電
流に考慮を払う必要がない。また可熔体の断面積を小さ
くできるので、常電導状態に転移させたときそれぞれ可
熔体の抵抗値を大として可熔体をその全長において熔断
発弧させることができる。このため従来の限流方法では
遮断できなかった小電流においても、限流遮断を行わせ
ることができる。When the superconducting state is changed to the normal conducting state by passing an exciting current through the magnetic field generating coil after a desired time from the time when the current exceeding the normal energizing current is detected as in the above means, the fusible body operates. You can easily and freely select the time until. Further, even during normal energization, if necessary, an external command signal may be used to cause an exciting current to flow in the magnetic field generating coil, thereby performing a breaking operation. Further, if the fusible material is superconducting and is normally energized, the resistance value of the fusible material is zero, or it can be normally energized with a resistance value close to this, so that it is not necessary to consider the normal energizing current. Further, since the cross-sectional area of the fusible material can be reduced, the resistance value of the fusible material can be increased and the fusible material can be blown and ignited over its entire length when transitioned to the normal conducting state. Therefore, the current limiting can be interrupted even with a small current that could not be interrupted by the conventional current limiting method.
【０００７】[0007]
【実施例】次にこの発明にかかる限流方法の具体例につ
いて説明する。図１はこの発明にかかる限流遮断方法の
実施例図である。図１において（１）は超電導線材、例
えばＮｂ（ニオブ），ＮｂＴｉ（ニオブチタン）により
形成された可熔体、（２）は絶縁性のヒューズ筒、
（３)(３')は電極、（４）は消弧剤例えば消弧砂であっ
て、絶縁性のヒューズ筒（２）は電極（３)(３')によっ
て密封され、電極（３)(３')間には可熔体（１）が電気
的に接続され、更に電極（３)(３')は回路（５）に直列
に接続される。また密封された絶縁性のヒューズ筒
（２）の内部空間には、消弧剤（４）が充填される。次
に（６）は冷却装置であって、冷却媒体例えば液化ヘリ
ウムの流通管路（７）と、冷却器（８）及び循環ポンプ
（９）などから形成され、通常通電時において可熔体
（１）が超電導状態となるように冷却する。（１０）は
磁界発生用コイルであって、可熔体（１）の外側のほぼ
全長に亘って電線を巻回して形成される。（１１）は回
路電流検出回路であって、変流器（１２）と、抵抗（１
３）と全波整流平滑回路（１４）と、基準電源（１５）
及び誤差増幅器（１６）などから形成され、以下のよう
に動作する。変流器（１２）により検出された電流は抵
抗（１３）により、図２（ａ）に比例する電圧に変換さ
れ、更に図２（ｂ）のように全波整流される。そして誤
差増幅器（１６）において、基準電源（１５）に設定さ
れた通常通電時の電流に対応する電圧との差をとられ
て、図２（ｃ）のように、過大電流のみを検出する。
（１７）は励磁電流流通回路であって、可変遅延回路
（１８）と、電子スイッチ回路（１９）と、外部指令信
号供給回路（１９’）と励磁電流制御回路（２０）およ
び励磁電源（２１）などから形成される。そして可変遅
延回路（１８）は回路電流検出回路（１１）により検出
された過大電流を、図２（ｄ）のように所望の時間Ｔだ
け遅延させて、電子的スイッチ回路（１９）をオンと
し、これより磁界発生用コイル（１０）に過大電流の立
上り点ｔ1 から所望の時間Ｔ後励磁電流を流して、可熔
体（１）が動作するまでの時間を選定する。また励磁電
流制御回路（２０）により、所望の動作電流値となるよ
うに励磁電流を制御して磁界発生用コイル（１０）に電
流を流して、可熔体（１）の動作電流ならびに動作まで
の時刻を可変とする。また過大電流が流れていない状態
でも外部指令回路（１９’）から指令を与えて回路を遮
断するようにする。なお図１では可熔体（１）を直線状
とした例を示したが、必要に応じて螺旋形としたりジグ
ザグ状に折曲げたり、更には複数本とすることもでき
る。EXAMPLES Specific examples of the current limiting method according to the present invention will be described below. FIG. 1 is an embodiment diagram of a current limiting interruption method according to the present invention. In FIG. 1, (1) is a superconducting wire, for example, a fusible material formed of Nb (niobium) or NbTi (niobium titanium), (2) is an insulating fuse cylinder,
(3) and (3 ') are electrodes, (4) is an arc-extinguishing agent such as arc-extinguishing sand, and the insulative fuse cylinder (2) is sealed by the electrodes (3) and (3'). The fusible material (1) is electrically connected between (3 '), and the electrodes (3) and (3') are connected in series to the circuit (5). The arc extinguishing agent (4) is filled in the internal space of the sealed insulative fuse cylinder (2). Next, (6) is a cooling device, which is composed of a cooling medium, for example, a liquefied helium flow conduit (7), a cooler (8), a circulation pump (9), etc. It is cooled so that 1) becomes a superconducting state. Reference numeral (10) is a magnetic field generating coil, which is formed by winding an electric wire over substantially the entire length outside the fusible material (1). (11) is a circuit current detection circuit, which includes a current transformer (12) and a resistor (1
3), full-wave rectifying and smoothing circuit (14), and reference power supply (15)
And an error amplifier (16) and operate as follows. The current detected by the current transformer (12) is converted by the resistor (13) into a voltage proportional to FIG. 2 (a), and further full-wave rectified as shown in FIG. 2 (b). Then, in the error amplifier (16), the difference from the voltage corresponding to the current at the time of normal energization set in the reference power supply (15) is taken and only the excessive current is detected as shown in FIG. 2 (c).
(17) is an exciting current distribution circuit, which includes a variable delay circuit (18), an electronic switch circuit (19), an external command signal supply circuit (19 '), an exciting current control circuit (20), and an exciting power source (21). ) And the like. Then, the variable delay circuit (18) delays the excessive current detected by the circuit current detection circuit (11) by a desired time T as shown in FIG. 2 (d) to turn on the electronic switch circuit (19). From this, an exciting current is passed to the magnetic field generating coil (10) from the rising point t 1 of the excessive current after a desired time T, and the time until the fusible body (1) operates is selected. In addition, the exciting current control circuit (20) controls the exciting current so as to obtain a desired operating current value, and the current is passed through the magnetic field generating coil (10) to the operating current and the operation of the fusible body (1). The time of is variable. In addition, even when an excessive current is not flowing, a command is given from the external command circuit (19 ') to shut off the circuit. Although FIG. 1 shows an example in which the fusible material (1) has a linear shape, it may have a spiral shape, a zigzag shape, or a plurality of pieces if necessary.
【０００８】[0008]
【発明の効果】この発明にかかる限流遮断方法によれ
ば、次の顕著な効果をうることができる。 従来のように限流ヒューズを交換することなく、外
部磁界の制御により任意の動作開始時刻のもとに任意の
電流値で限流動作を開始させることができる。 可熔体の抵抗値は通常通電時零またはこれに近い値
であるので、従来のように限流ヒューズを交換して動作
電流値を変更するもののように、通常通電電流に考慮を
及ぼす必要がない。 可熔体の全長において超電導状態になるので、可熔
体の全長において熔断発弧をさせることができる。従っ
て限流動作が確実となる。 超電導状態で通常通電するため、可熔体の断面積を
小さくできる。従って小電流において動作させた場合で
も、可熔体の全長において熔断発弧させることができ
る。このため小電流においても確実に電流の限流遮断を
行うことができる。According to the current limiting shutoff method of the present invention, the following remarkable effects can be obtained. It is possible to start the current limiting operation at an arbitrary current value at an arbitrary operation start time by controlling the external magnetic field without replacing the current limiting fuse as in the conventional case. Since the resistance value of the fusible material is normally zero or a value close to this, it is necessary to give consideration to the normal energizing current as in the case of changing the operating current value by replacing the current limiting fuse as in the past. Absent. Since the entire length of the fusible body is in a superconducting state, it is possible to cause a fusing arc in the entire length of the fusible material. Therefore, the current limiting operation becomes reliable. Since the current is normally applied in the superconducting state, the cross-sectional area of the fusible material can be reduced. Therefore, even when operated at a small current, the entire length of the fusible material can be blown and ignited. Therefore, the current limiting can be surely interrupted even with a small current.
【図１】この発明にかかる限流遮断方法の一実施例の説
明図である。FIG. 1 is an explanatory diagram of an embodiment of a current limiting interruption method according to the present invention.
【図２】この発明にかかる限流遮断方法における動作説
明用の波形図である。FIG. 2 is a waveform diagram for explaining the operation of the current limiting interruption method according to the present invention.
【図３】従来方法の説明図である。FIG. 3 is an explanatory diagram of a conventional method.
（Ｆ） 可熔体 （ＬＦ） 限流ヒューズ （Ｌ） 回路 （１） 可熔体 （２） 絶縁性のヒューズ筒 （３） 電極 （３') 電極 （４） 消弧剤 （５） 回路 （６） 冷却装置 （７） 冷却媒体の流通管路 （８） 冷却器 （９） 循環ポンプ （１０） 磁界発生用コイル （１１） 回路電流検出回路 （１２） 変流器 （１３） 抵抗 （１４） 全波整流回路 （１５） 基準電源 （１６） 誤差増幅器 （１７） 励磁電流流通回路 （１８） 可変遅延回路 （１９） スイッチ回路 （１９’） 外部指令信号回路 （２０） 励磁電流制御回路 （２１） 励磁電源 (F) Fusible material (LF) Current limiting fuse (L) Circuit (1) Fusible material (2) Insulating fuse tube (3) Electrode (3 ') Electrode (4) Arc extinguishing agent (5) Circuit ( 6) Cooling device (7) Coolant distribution pipe (8) Cooler (9) Circulation pump (10) Magnetic field generating coil (11) Circuit current detection circuit (12) Current transformer (13) Resistance (14) Full wave rectifier circuit (15) Reference power supply (16) Error amplifier (17) Excitation current distribution circuit (18) Variable delay circuit (19) Switch circuit (19 ') External command signal circuit (20) Excitation current control circuit (21) Excitation power supply
Claims (1)
超電導状態に保持して通常通電すると共に、前記可熔体
の外側に設けられ、かつ外部指令信号または検出された
通常通電電流を上廻る電流の発生時点から、所要時間後
所要の電流値の励磁電流が流される磁界発生用コイルの
外部磁界により、前記可熔体の超電導状態を常電導状態
に転移させ、これにより生じた可熔体の抵抗と通電電流
とにより可熔体を熔断発弧させることを特徴とする回路
電流の限流熔断方法。1. A fusible material formed of a superconducting wire,
Exciting the required current value after a required time from the time of generation of a current that is kept outside in the superconducting state and is normally energized, and that is provided outside the fusible material and that exceeds the external command signal or the detected normal energizing current. An external magnetic field of a magnetic field generating coil through which an electric current is passed causes the superconducting state of the fusible material to transition to a normal conducting state, and the resistance of the fusible material and the energizing current generated thereby cause the fusible material to arc. A method for current limiting and fusing a circuit current, which is characterized in that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4126645A JPH05300642A (en) | 1992-04-21 | 1992-04-21 | Method for limiting and cutting-off circuit current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4126645A JPH05300642A (en) | 1992-04-21 | 1992-04-21 | Method for limiting and cutting-off circuit current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05300642A true JPH05300642A (en) | 1993-11-12 |
Family
ID=14940331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4126645A Pending JPH05300642A (en) | 1992-04-21 | 1992-04-21 | Method for limiting and cutting-off circuit current |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05300642A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040032661A (en) * | 2002-10-10 | 2004-04-17 | 주식회사 프리컴시스템 | High-temperature-superconductor fuse limiting high fault current equipped with conduction cooled cryostat system |
| JP2007189227A (en) * | 2006-01-13 | 2007-07-26 | European High Temperature Superconductors Gmbh & Co Kg | Power adjusting method and device |
| CN115602505A (en) * | 2021-06-25 | 2023-01-13 | 比亚迪股份有限公司（Cn） | Fuse protector |
-
1992
- 1992-04-21 JP JP4126645A patent/JPH05300642A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040032661A (en) * | 2002-10-10 | 2004-04-17 | 주식회사 프리컴시스템 | High-temperature-superconductor fuse limiting high fault current equipped with conduction cooled cryostat system |
| JP2007189227A (en) * | 2006-01-13 | 2007-07-26 | European High Temperature Superconductors Gmbh & Co Kg | Power adjusting method and device |
| CN115602505A (en) * | 2021-06-25 | 2023-01-13 | 比亚迪股份有限公司（Cn） | Fuse protector |
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