JPH0340924B2 - - Google Patents
Info
- Publication number
- JPH0340924B2 JPH0340924B2 JP58005871A JP587183A JPH0340924B2 JP H0340924 B2 JPH0340924 B2 JP H0340924B2 JP 58005871 A JP58005871 A JP 58005871A JP 587183 A JP587183 A JP 587183A JP H0340924 B2 JPH0340924 B2 JP H0340924B2
- Authority
- JP
- Japan
- Prior art keywords
- superconducting
- superconducting coil
- power supply
- coil
- current
- 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.)
- Expired - Lifetime
Links
- 230000001681 protective effect Effects 0.000 claims description 19
- 230000002238 attenuated effect Effects 0.000 claims description 6
- 230000005284 excitation Effects 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims 1
- 238000010791 quenching Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 5
- 230000000087 stabilizing effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/02—Quenching; Protection arrangements during quenching
Description
〔発明の技術分野〕
本発明は超電導コイルの電源装置に関するもの
であり、特に相互インダクタンスを有する２個以
上の超電導コイル群とその電源装置群から成るシ
ステムに関するものである。
〔発明の技術的背景とその問題点〕
超電導コイルは、ある種の金属、合金（例えば
NbTi、Nb3Sn等）が極低温に於て電気抵抗零に
なる現象を利用して、低損失で高磁界を得、核融
合装置、加速器、エネルギー貯蔵装置等に応用し
ようとするものである。近年、高性能超電導線の
開発、超電導コイル巻線技術の進歩等超電導現
象・技術の研究開発はめざましい進歩をとげ、大
型、高磁界、高エネルギーの超電導コイルが製作
されるようになつた。超電導コイルに流れる電流
をＩ、自己インダクタンスをＬとするその蓄積エ
ネルギーは1/2LI2となる。超電導コイルが運転中
に何らかの原因で、常電導転移（クエンチ）を起
こすと、このエネルギーはコイル内部でジュール
熱となり、コイルを破壊してしまう。
これを避ける為、コイルと電源との間にエネル
ギー吸収用の保護抵抗を挿入するのが一般的であ
る。第１図ａにこの基本的な回路を示す。超電導
コイル１を励磁するためには、開閉器３（SW
２）を開いておき、開閉器４（SW１）を閉じ、
直流電源５(E)により電流Ｉを）流す。
超電導コイル１がクエンチした場合、開閉器３
を閉じ、開閉器４を開いて電源５を切り離し、超
電導コイル１と保護抵抗２とから成るＬ−Ｒ閉回
路にて電流を減衰させる。このときクエンチした
超電導コイル１の抵抗が保護抵抗２に比べて充分
小さいとすると、超電導コイルの電流Ｉは第１図
ｂに示す如く指数関係
Ｉ＝IOe-R/L t ……(1)
で減衰する。（但し、IOは開閉器４を開いたとき
超電導コイル１に流れていた電流値を示す。又Ｒ
は保護抵抗２の抵抗値、Ｌは超電導コイル１の自
己インダクタンスである。）(1)式から明らかなよ
うに、クエンチ時超電導コイル１の電流をできる
だけ早く減衰させる為には、保護抵抗２の値Ｒが
大きい方が良く、（減衰時定数τ＝Ｌ／Ｒ）超電
導線の許容温度TFを越えないよう、すみやかに
電流Ｉを減衰させる為に必要な最小抵抗は以下の
条件より求められる。
∫γI2dt∫TF TOmcdT ……(2)
但し、
γ：超電導線（含安定化材）の単位長さ当りの抵
抗値
ｍ：超電導線（含安定化材）の単位当りの重さ
ｃ：超電導線（含安定化材）の比熱、
TF：超電導線（含安定化材）の許容温度
（例えば100k）
TO：超電導線（含安定化材）の初期温度
（例えば4.2k）
(2)式に(1)式を代入して整理し直すと(3)式を得
る。
Ｒ１／２LI2 O／∫TF TOmc／ｒdT ……(3)
一方、超電導コイル１の端子間に加わる電圧Ｅ
があまり高いと超電導コイル１は絶縁破壊してし
まうのでＲには上限値が存在する。クエンチ発生
時前述の如く開閉器２を閉じ、開閉器１を開いた
場合、超電導コイル１の端子間に発生する電圧Ｅ
は(1)式よりＥ＝RI＝RIOe-R/L tとなる。したがつ
てＥの最大値RIOが超電導コイル１の絶縁耐力EO
（例えば1000V）より小さいことが必要であり、
この条件よりＲの上限値は(4)式で与えられる。
EO／IOＲ ……(4)
従来の超電導コイルの電源装置では保護抵抗は
前記(3)式、(4)式を満たす範囲でどちらかと言う
と、電流を速く減衰させる為に(4)式を満たす範囲
の上限値を選定していた。
次に、第２図ａに示すように２個の超電導コイ
ルＬ１，Ｌ２が相互インダクタンスＭで電磁的に
結合している場合を考える。超電導コイルＬ１，
Ｌ２に励磁電流I10、I20が流れている状態で、超
電導コイルＬ１がクエンチし、SW１２を閉じ、
SW１１を開放した場合、｛現象を理解しやすく
する為超電コイルＬ２側の電源Ｅ２が無制御（バ
イパスペア運転相当）の場合を考えると、｝超電
導コイルＬ１の電流は
I1＝I10e-t/〓 ……(5)
但し、τ＝L1L2−M2／L2R
で減衰し、超電導コイルＬ２の電流は
I2I20＋Ｍ／L2I10（１−e-t/〓） ……(6)
但し、τ＝L1L2−M2／L2R
で増加する。（第２図ｂ参照）即ち超電導コイル
Ｌ２の電流I2は最大
I20＋Ｍ／L2I10 ……(7)
まで増加してしまい、（一例としてI10＝I20、L1＝
L2、Ｍ＝ｋ√1 2ｋ＝0.5の場合を考えるとI20＋
Ｍ／L2I10＝1.5I20、150％過電流となる。）クエンチ
を起こしていない超電導コイルＬ２までクエンチ
してしまう可能性が極めて高かつた。又、超電導
コイルＬ２が引き続いてクエンチした場合の保護
も前述の場合と同様にSW２２を閉じ、SW２１
を開放し前述(3)式、(4)式の方法で決定した保護抵
抗R2でエネルギーを消費し保護していた。つま
り、従来のシステムは超電導コイル１個からなる
単純なシステムを単に電磁的に結合させた制御保
護方式にすぎず、１個の超電導コイルがクエンチ
すると他のクエンチしていない超電導コイルまで
クエンチしてしまい省エネルギーの観点からも極
めて不経済であつた。
〔発明の目的〕
本発明は電磁的に結合した複数個の超電導コイ
ルから成るシステムに於いて、ある超電導コイル
がクエンチしたとき、その超電導コイルの電流を
速やかに減衰させるとともに他のクエンチしてい
ない超電導コイル群をクエンチさせないようにし
た超電導コイル用電源装置を得ることを目的とす
る。
〔発明の実施例〕
以下本発明の原理を図面を参照して説明する。
以下の説明に於ては簡単の為超電導コイルが２個
の場合を考える。
第２図ａに於て、超電導コイルＬ１がクエンチ
し、SW１２閉、SW１１開としたときの回路方
程式は(7)式、(8)式のようになる。
L1I〓1＋MI〓2＋R1I1＝０ ……(7)
L2I〓2＋MI〓1＝E2 ……(8)
電源E2の制御により超電導コイルＬ２の電流
を変化させないように制御する（つまりI〓2＝０と
なるよう制御する。）と、
(7)式より
(8)式より
つまり電源E2を
[Technical Field of the Invention] The present invention relates to a power supply device for superconducting coils, and more particularly to a system comprising two or more superconducting coil groups having mutual inductance and their power supply group. [Technical background of the invention and its problems] Superconducting coils are made of certain metals or alloys (e.g.
By utilizing the phenomenon that electrical resistance of NbTi, Nb 3 Sn, etc.) becomes zero at extremely low temperatures, it is possible to obtain a high magnetic field with low loss and apply it to nuclear fusion devices, accelerators, energy storage devices, etc. . In recent years, research and development of superconducting phenomena and technologies, such as the development of high-performance superconducting wires and advances in superconducting coil winding technology, have made remarkable progress, and large-sized, high-magnetic-field, high-energy superconducting coils have come to be manufactured. The stored energy is 1/2LI 2 , where I is the current flowing through the superconducting coil and L is the self-inductance. If a superconducting coil undergoes a normal conduction transition (quench) for some reason during operation, this energy becomes Joule heat inside the coil, destroying the coil. To avoid this, it is common to insert a protective resistor for energy absorption between the coil and the power source. Figure 1a shows this basic circuit. In order to excite the superconducting coil 1, a switch 3 (SW
2) and close switch 4 (SW1).
A current I) is caused to flow by the DC power supply 5 (E). When superconducting coil 1 quenches, switch 3
is closed, the switch 4 is opened to disconnect the power source 5, and the current is attenuated in the L-R closed circuit consisting of the superconducting coil 1 and the protective resistor 2. Assuming that the resistance of the quenched superconducting coil 1 is sufficiently smaller than the protective resistor 2, the current I of the superconducting coil has an exponential relationship as shown in Figure 1b: I=I O e -R/L t ...(1 ) attenuates. (However, I O indicates the current value flowing through the superconducting coil 1 when the switch 4 was opened. Also, R
is the resistance value of the protective resistor 2, and L is the self-inductance of the superconducting coil 1. ) As is clear from equation (1), in order to attenuate the current in superconducting coil 1 as quickly as possible during quenching, it is better to have a larger value R of protective resistor 2, and (attenuation time constant τ = L/R) superconducting The minimum resistance required to quickly attenuate the current I without exceeding the wire's permissible temperature T F is determined from the following conditions. ∫γI 2 dt∫ TF TO mcdT ...(2) However, γ: Resistance value per unit length of superconducting wire (including stabilizing material) m: Weight per unit of superconducting wire (including stabilizing material) c : Specific heat of superconducting wire (including stabilizing material), T F : Allowable temperature of superconducting wire (including stabilizing material) (e.g. 100k) TO : Initial temperature of superconducting wire (including stabilizing material) (e.g. 4.2k) ( Substituting equation (1) into equation (2) and rearranging it, we obtain equation (3). R1/2LI 2 O /∫ TF TO mc/rdT ...(3) On the other hand, the voltage E applied between the terminals of superconducting coil 1
If R is too high, the superconducting coil 1 will suffer dielectric breakdown, so there is an upper limit to R. When a quench occurs, when the switch 2 is closed and the switch 1 is opened as described above, the voltage E generated between the terminals of the superconducting coil 1
From equation (1), E=RI=RI O e -R/L t . Therefore, the maximum value of E RI O is the dielectric strength E O of superconducting coil 1
(e.g. 1000V),
Based on this condition, the upper limit value of R is given by equation (4). E O /I O R ...(4) In the conventional superconducting coil power supply device, the protective resistor is set within the range that satisfies the above equations (3) and (4), in order to attenuate the current quickly. ) was selected as the upper limit of the range that satisfied the formula. Next, consider a case where two superconducting coils L1 and L2 are electromagnetically coupled through mutual inductance M, as shown in FIG. 2a. superconducting coil L1,
With excitation currents I 10 and I 20 flowing through L2, superconducting coil L1 is quenched, SW12 is closed,
When SW11 is opened, {to make it easier to understand the phenomenon, consider the case where the power supply E2 on the superconducting coil L2 side is uncontrolled (equivalent to bypass pair operation)} The current in the superconducting coil L1 is I 1 = I 10 e -t/ 〓 ……(5) However, it is attenuated by τ=L 1 L 2 −M 2 /L 2 R, and the current in superconducting coil L2 is I 2 I 20 +M/L 2 I 10 (1−e -t / 〓) ……(6) However, it increases as τ=L 1 L 2 −M 2 /L 2 R. (See Figure 2b) That is, the current I 2 of the superconducting coil L2 increases to a maximum of I 20 +M/L 2 I 10 (7) (for example, I 10 = I 20 , L 1 =
L 2 , M=k√ 1 2 Considering the case of k=0.5, I 20 +
M/L 2 I 10 = 1.5I 20 , resulting in 150% overcurrent. ) There was an extremely high possibility that superconducting coil L2, which was not quenched, would also be quenched. In addition, for protection when the superconducting coil L2 is subsequently quenched, SW22 is closed and SW21 is closed as in the case described above.
was opened and energy was consumed and protected by the protective resistance R 2 determined by the methods of equations (3) and (4) above. In other words, the conventional system is simply a control and protection method that electromagnetically couples a simple system consisting of one superconducting coil, and when one superconducting coil quenches, other unquenched superconducting coils are also quenched. Moreover, it was extremely uneconomical from the point of view of energy conservation. [Object of the Invention] The present invention provides a system comprising a plurality of electromagnetically coupled superconducting coils, in which when one superconducting coil is quenched, the current in that superconducting coil is quickly attenuated and the current in the other superconducting coils is not quenched. An object of the present invention is to obtain a power supply device for superconducting coils that does not quench a group of superconducting coils. [Embodiments of the Invention] The principles of the present invention will be explained below with reference to the drawings.
In the following explanation, for simplicity, a case will be considered in which there are two superconducting coils. In FIG. 2a, when the superconducting coil L1 is quenched, SW12 is closed, and SW11 is open, the circuit equations are as shown in equations (7) and (8). L 1 I〓 1 +MI〓 2 +R 1 I 1 =0 ...(7) L 2 I〓 2 +MI〓 1 =E 2 ...(8) The current in superconducting coil L2 is not changed by controlling the power source E2 . (In other words, control so that I〓 2 = 0.) From equation (7), we get From equation (8) That is, the power supply E 2
【式】のよ
うに制御すれば超電導コイルL2の電流は変化し
ないことになる。
従来のシステムでは電源E1、E2の出力電圧は
コイル励磁時間Ｔと励磁電流、コイル自己インダ
クタンスからE1L1I10／Ｔ、E2L2I20／Ｔ（例えばL1
＝L2＝10H、I10＝I20＝10KA、Ｔ＝60分の場合
E1＝E2＝10H×10×103A／60×60S≒28V）と保護
抵抗とは無関係に決めていたが、本発明は電源
E2のインバータ電圧と保護抵抗を関係づけ〔E2〕
INV＝−MR1I10／L1となるように設計し、（例えばL1
＝10H、Ｍ＝5H、R1＝20ｍΩ、I10＝10KAのと
き〔E2〕INV＝−100Vとなる。）
超電導コイルＬ１クエンチ時に電源E2を(10)式
の如く制御することにより超電導コイルＬ２の電
流変化を零とし、クエンチの波及伝播を防止する
ことを可能ならしめる超電導コイルの電源装置を
提供するものである。
以上の説明では、超電導コイルＬ１がクエンチ
した場合を考えたが、逆に超電導コイルＬ２がク
エンチした場合も含めて考えると、電磁的に結合
された２個の超電導コイルとその励磁電源から構
成されるシステムに於て、保護抵抗の抵抗値、励
磁電源の定格インバータ電圧を以下の関係式を満
足するよう決定することにより１個の超電導コイ
ルがクエンチした場合、そのコイル電流はすみや
かに減衰させ、他の健全な超電導コイルは定電流
制御し、クエンチの波及伝播を防止し、かつ省エ
ネルギー効果をもたせることを特徴とする超電コ
イルの電源装置を提供出来る。
(9)式から明らかな様に保護抵抗R1、R2の値は
直流電源Ｅ１，Ｅ２のインバータ電圧と比例関係
にあるので、電源装置を合理的で安価にする為に
は保護抵抗Ｒ１，Ｒ２は(9)式を満たす範囲で下限
値を選定することが望ましい。
次に、以上の関係を電磁的に結合された複数個
の超電導コイルの場合に拡張適用する場合を考え
る。電磁的に結合されたｎ個の超電導コイル群に
於てｉ番目の超電コイルがクエンチし、このコイ
ルを前述の方法に従つて保護抵抗Riにより保護し
た場合の回路方程式は以下のようになる。
ここでｉ番目の超電導コイル以外の超電導コイ
ルの電流を定電流制御したとすると、I〓k＝０、ｋ
＝１〜ｎ、ｋ≠ｉであるから(10)式は
LiI〓i＋RiIi＝０
MkiI〓i＝Ek ……（11）
となる。したがつて（11）式を解いて（12）式を
得る。
つまり、ｉ番目のコイルがクエンチし、保護抵
抗Riで電流を減衰させたときｋ番目（ｋ＝１〜
ｎ、ｋ≠ｉ）コイルの電源装置のインバータ電圧
は最大〔Ek〕INV＝−MkiRiIip／Li出力可能なように
設計されていれば、ｋ番目のコイルは定電流制御
可能となる。ここでｉ＝１〜ｎ、ｉ≠ｋのいずれ
かのコイルがクエンチした場合でもｋ番目のコイ
ルを定電流制御可能ならしめるためには（13）式
が成立すればよい。
〔Ek〕INV＝−Max〔Mk1R1I10／L1、Mk2R2I20／L2
、…、MkoRoIop／Lo〕……（13）
但し、記号Max〔x1、x2、…、xo〕はx1、x2、
…xnのうち最大値を示す。例えばx1x2…
xoのときMax〔x1、x2、…xo〕＝xoとなる。
さらに保護抵抗の制約条件を加えて、ｋ番目の
コイルの電源装置の保護抵抗の抵抗値Rk、直流
電源の定格インバータ電圧〔Ek〕INVを（14）式を
満足するように決定することにより、ｎ個の超電
導コイルのいづれがクエンチしてもｋ番目の超電
導コイルは定電流制御可能となりクエンチの波
及・伝播を防止し、省エネルギー効果大の超電導
コイルの電源装置を提供出来る。
〔発明の効果〕
上記（14）式から明らかなように（14a）式を
満たす範囲で最小の抵抗値を選択すれば（14b）
式から決まる直流電流の定格インバータ電圧が低
くなり、合理的で安価な超電導コイル用電源装置
を提供出来る。If it is controlled as shown in [Formula], the current in superconducting coil L 2 will not change. In the conventional system, the output voltage of the power supplies E 1 and E 2 is calculated from the coil excitation time T, excitation current, and coil self-inductance as E 1 L 1 I 10 /T, E 2 L 2 I 20 /T (for example, L1 = L2 = 10H). , I 10 = I 20 = 10KA, T = 60 minutes
E 1 = E 2 = 10 H × 10 × 10 3 A / 60 × 60 S ≒ 28 V) was determined regardless of the protective resistance, but the present invention
Relationship between E 2 inverter voltage and protective resistance [E 2 ]
It is designed so that INV = -MR 1 I 10 /L 1 (for example, when L 1 = 10H, M = 5H, R 1 = 20 mΩ, and I 10 = 10KA, [E 2 ] INV = -100V. ) To provide a power supply device for a superconducting coil, which makes it possible to make the current change in the superconducting coil L2 zero by controlling the power source E2 as shown in equation (10) when the superconducting coil L1 is quenched, thereby preventing the spread of quench. It is something. In the above explanation, we considered the case where the superconducting coil L1 is quenched, but if we also consider the case where the superconducting coil L2 is quenched, the superconducting coil consists of two electromagnetically coupled superconducting coils and their excitation power source. In such a system, when one superconducting coil quenches, the coil current is immediately attenuated by determining the resistance value of the protective resistor and the rated inverter voltage of the excitation power source to satisfy the following relational expression. It is possible to provide a power supply device for a superconducting coil, which is characterized in that other healthy superconducting coils are controlled at a constant current to prevent the spread of quench, and have an energy saving effect. As is clear from equation (9), the values of the protective resistors R 1 and R 2 are proportional to the inverter voltage of the DC power supplies E1 and E2. It is desirable to select a lower limit value for R2 within a range that satisfies equation (9). Next, consider extending the above relationship to the case of a plurality of electromagnetically coupled superconducting coils. When the i-th superconducting coil in a group of n superconducting coils electromagnetically coupled is quenched and this coil is protected by the protective resistor R i according to the method described above, the circuit equation is as follows: Become. Here, if we assume that the current of the superconducting coils other than the i-th superconducting coil is controlled at a constant current, I〓k=0, k
=1 to n, and k≠i, so equation (10) becomes L i I〓 i +R i I i =0 MkiI〓 i =Ek (11). Therefore, equation (11) is solved to obtain equation (12). In other words, when the i-th coil is quenched and the current is attenuated by the protective resistor R i , the k-th (k = 1 to
n, k≠i) The inverter voltage of the coil power supply is the maximum [Ek] INV = -MkiR i I ip /L i If it is designed to be able to output, the kth coil can be controlled with constant current. . Here, even if any of the coils with i=1 to n and i≠k is quenched, equation (13) should hold in order to enable constant current control of the k-th coil. [E k ] INV = −Max [M k1 R 1 I 10 /L 1 , M k2 R 2 I 20 /L 2
,..., M ko R o I op / L o ]... (13) However, the symbol Max [x 1 , x 2 ,..., x o ] is x 1 , x 2 ,
...x indicates the maximum value among n . For example x 1 x 2 ...
When x o , Max [x 1 , x 2 , ... x o ] = x o . Furthermore, by adding the protective resistance constraints, determine the resistance value R k of the protective resistor of the power supply device of the k-th coil and the rated inverter voltage [E k ] INV of the DC power supply so as to satisfy equation (14). Therefore, even if any of the n superconducting coils is quenched, the k-th superconducting coil can be controlled at a constant current, thereby preventing the spread and propagation of the quench, and providing a superconducting coil power supply device with a large energy-saving effect. [Effect of the invention] As is clear from the above equation (14), if the minimum resistance value is selected within the range that satisfies equation (14a), (14b)
The rated inverter voltage of the direct current determined by the formula is lowered, and a rational and inexpensive power supply device for superconducting coils can be provided.
第１図ａ、第２図ａは本発明の背景、原理を示
す回路図であり、第１図ｂ、第２図ｂは時刻ｔ＝
t0でクエンチが発生し、保護動作を行なつた場合
の電流波形を示す。
１……超電導コイル、２……保護抵抗、３……
開閉器、４……開閉器、５……直流電源。
1a and 2a are circuit diagrams showing the background and principle of the present invention, and FIGS. 1b and 2b are circuit diagrams showing the time t=
The current waveform is shown when a quench occurs at t 0 and a protective operation is performed. 1...Superconducting coil, 2...Protection resistor, 3...
Switch, 4...Switch, 5...DC power supply.
Claims (1)
と、その各々の超電導コイルに蓄積エネルギー吸
収用の保護抵抗を備えてなる超電導コイル用電源
装置において、前記複数個の超電導コイルの自己
インダクタンスをL1、L2、…Lo、ｋ番目とｉ番
目の超電導コイルの相互インダクタンスをMki、
励磁電流値をI10、I20、…、Ino各保護抵抗値を
R1、R2、…、Ro、直流電源の定格逆変換電圧を
〔E1〕INV、…〔Eo〕INV又、前記超電導コイルの線材
の単位長さ当りの抵抗値をｒ、重量をｍ、比熱を
ｃ、超電導線の常温をTp、許容上限温度をTF、
超電導コイルの絶縁耐力をEkoとしたときこたら
の値が下記関係式を満足するようにしたことを特
徴とする超電導コイル用電源装置。 ｋ＝１、２、…ｎ １／２LkIkp 2／∫TF TOmc／ｒdTRkEkp／Ikp 〔Ek〕INV＝− maxi≠k 〔MkiRiIip／Li〕 ２ 前記関係式を満足する超電導システムに於
て、ある１個の超電導コイルが常電導転移を生じ
たとき、当該超電導コイルの電流を保護抵抗によ
り減衰させるとともに他の健全群超電導コイルの
電流値は一定となるように制御することを特徴と
する特許請求の範囲第１項記載の超電導コイル用
電源装置。[Scope of Claims] 1. A superconducting coil power supply device comprising a plurality of electromagnetically coupled superconducting coils and a protective resistor for absorbing stored energy in each superconducting coil, wherein the plurality of superconducting coils are provided with a protective resistor for absorbing stored energy. Let the self - inductances of
The excitation current value is I 10 , I 20 , ..., Ino each protection resistance value is
R 1 , R 2 , ..., R o , the rated inverse conversion voltage of the DC power supply [E 1 ] INV , ... [E o ] INV Also, the resistance value per unit length of the wire of the superconducting coil is r, the weight m, specific heat c, normal temperature of superconducting wire T p , allowable upper limit temperature T F ,
A power supply device for a superconducting coil, characterized in that, when the dielectric strength of the superconducting coil is Eko, the value of Eko satisfies the following relational expression. k=1, 2,...n 1/2L k I kp 2 /∫ TF TO mc/rdTR k E kp /I kp [E k ] INV = - max i≠k [M ki R i I ip /L i ] 2. In a superconducting system that satisfies the above relational expression, when one superconducting coil undergoes normal conduction transition, the current of the superconducting coil is attenuated by a protective resistor, and the current values of other healthy superconducting coils are A power supply device for a superconducting coil according to claim 1, characterized in that the power supply device is controlled to be constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58005871A JPS59132108A (en) | 1983-01-19 | 1983-01-19 | Power supply device for superconductive coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58005871A JPS59132108A (en) | 1983-01-19 | 1983-01-19 | Power supply device for superconductive coil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59132108A JPS59132108A (en) | 1984-07-30 |
| JPH0340924B2 true JPH0340924B2 (en) | 1991-06-20 |
Family
ID=11622990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58005871A Granted JPS59132108A (en) | 1983-01-19 | 1983-01-19 | Power supply device for superconductive coil |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59132108A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0121846D0 (en) * | 2001-09-10 | 2001-10-31 | Oxford Instr Superconductivity | Superconducting magnet assembly and method |
| DE102005040374B4 (en) * | 2005-08-25 | 2008-10-02 | Bruker Biospin Ag | Superconducting magnet arrangement with contactable resistance elements |
-
1983
- 1983-01-19 JP JP58005871A patent/JPS59132108A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59132108A (en) | 1984-07-30 |
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