JPH07177648A - Dc interrupting system for superconducting unit - Google Patents
Dc interrupting system for superconducting unitInfo
- Publication number
- JPH07177648A JPH07177648A JP5321960A JP32196093A JPH07177648A JP H07177648 A JPH07177648 A JP H07177648A JP 5321960 A JP5321960 A JP 5321960A JP 32196093 A JP32196093 A JP 32196093A JP H07177648 A JPH07177648 A JP H07177648A
- Authority
- JP
- Japan
- Prior art keywords
- current
- commutation
- main circuit
- superconducting
- capacitor
- 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
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/59—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle
- H01H33/596—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle for interrupting dc
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/001—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for superconducting apparatus, e.g. coils, lines, machines
-
- 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
- Protection Of Static Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、超電導コイルを保護す
るための直流しゃ断システムに関する。FIELD OF THE INVENTION The present invention relates to a direct current interruption system for protecting a superconducting coil.
【０００２】[0002]
【従来の技術】近年の、超電導技術の進歩は目ざまし
く、それに伴い超電導コイルも次第に大容量化する傾向
にある。図３に超電導応用装置の一構成例を示す。超電
導コイル１は直流しゃ断器２を介して励磁電源３に接続
されている。このシステムで異常が発生した場合は、超
電導コイル１と並列に接続されたスイッチ４を閉じ、直
流しゃ断器２を開くことによって電流を減衰抵抗５に転
流させて超電導コイルを保護するのが一般的である。こ
こで、超電導コイルの通電電流がしゃ断器の定格しゃ断
電流以下である場合は問題ないが、大電流になると、直
流しゃ断器２は複数のしゃ断器を並列に接続して構成す
る必要がある。このように並列運転を行うケースでは、
アーク電圧−電流特性より真空しゃ断器を適用するケー
スが多い。2. Description of the Related Art In recent years, the progress of superconducting technology has been remarkable, and accordingly, the capacity of superconducting coils is gradually increasing. FIG. 3 shows an example of the configuration of the superconducting application device. The superconducting coil 1 is connected to an exciting power source 3 via a DC breaker 2. When an abnormality occurs in this system, it is common to close the switch 4 connected in parallel with the superconducting coil 1 and open the DC breaker 2 to divert a current to the damping resistor 5 to protect the superconducting coil. Target. Here, there is no problem when the energizing current of the superconducting coil is less than or equal to the rated breaking current of the breaker, but when the current becomes large, the DC breaker 2 needs to be configured by connecting a plurality of breakers in parallel. In the case of parallel operation like this,
Vacuum breakers are often applied because of the arc voltage-current characteristics.
【０００３】図４に真空しゃ断器を並列接続して直流し
ゃ断器を構成する場合の直流しゃ断システムの一構成例
を示す。直流しゃ断器と並列に転流リアクトル６、転流
コンデンサ７、投入スイッチ８から成る強制転流回路が
接続されている。強制転流回路は、直流電流をしゃ断す
る際に発生するアークを消弧するために逆方向の振動電
流を重畳し、強制的に電流零点を形成する。なお、コン
デンサ充電電源９は転流コンデンサ７に所定の電荷を蓄
積するためのものである。FIG. 4 shows an example of the configuration of a direct current circuit breaker system in which a vacuum circuit breaker is connected in parallel to form a direct current circuit breaker. A forced commutation circuit including a commutation reactor 6, a commutation capacitor 7, and a closing switch 8 is connected in parallel with the DC breaker. The forced commutation circuit superimposes an oscillating current in the opposite direction to extinguish the arc generated when the direct current is cut off, and forcibly forms a current zero point. The capacitor charging power source 9 is for accumulating a predetermined charge in the commutation capacitor 7.
【０００４】[0004]
【発明が解決しようとする課題】ところで、このような
直流しゃ断システムでは、転流回路の定数が主回路の最
大しゃ断電流を基に決定され、かつ不変であるため、主
回路の通電電流が時間的に変化するような超電導応用装
置ではしゃ断が不確実になるという問題がある。主回路
に最大通電電流が流れている状態でしゃ断が行われる
時、しゃ断器を流れる電流の電流零点近傍の電流変化率
（ｄｉ／ｄｔ値）は、しゃ断器の特性より定まるｄｉ／
ｄｔ値以下となるように諸定数を決定しているため、主
回路電流のしゃ断は確実に行われる。しかし、転流コン
デンサ定数が同じ条件において通電電流が小さい場合
は、電流零点近傍のｄｉ／ｄｔ値は厳しくなり、このｄ
ｉ／ｄｔ値がしゃ断器の許容するｄｉ／ｄｔ値を超える
と、しゃ断失敗となるケースが発生し、コイルの保護に
悪影響を及ぼすことになる。そこで本発明の目的は、し
ゃ断が確実な超電導応用装置の直流しゃ断システムを提
供することにある。By the way, in such a DC interruption system, the constant current of the commutation circuit is determined based on the maximum interruption current of the main circuit and is invariable. There is a problem that the interruption becomes uncertain in a superconducting application device that changes dynamically. When the circuit is interrupted while the maximum current is flowing in the main circuit, the current change rate (di / dt value) of the current flowing through the circuit breaker near the current zero point is determined by the characteristic of the circuit breaker.
Since the constants are determined so as to be equal to or less than the dt value, the main circuit current can be cut off without fail. However, when the energizing current is small under the condition that the commutation capacitor constant is the same, the di / dt value near the current zero becomes severe.
If the i / dt value exceeds the di / dt value allowed by the circuit breaker, the case of failure of the circuit occurs, which adversely affects the protection of the coil. SUMMARY OF THE INVENTION An object of the present invention is to provide a DC cutoff system for a superconducting application device in which the cutoff is reliable.
【０００５】[0005]
【課題を解決するための手段】本発明による超電導応用
装置の直流しゃ断システムは、上記の目的を達成するた
めに、主回路の通電電流を検出し、その通電電流に応じ
て転流コンデンサの充電電圧を制御する機能を備えた構
成とする。SUMMARY OF THE INVENTION In order to achieve the above object, a direct current interruption system for a superconducting application device according to the present invention detects an energizing current of a main circuit and charges a commutation capacitor in accordance with the energizing current. The configuration has a function of controlling the voltage.
【０００６】[0006]
【作用】本発明によれば、主回路の通電電流に応じて転
流コンデンサの充電電圧を制御することにより、最適な
転流電流を重畳することができ、しゃ断を確実に行うこ
とができる。According to the present invention, the optimum commutation current can be superimposed by controlling the charging voltage of the commutation capacitor in accordance with the current flowing through the main circuit, and the cutoff can be surely performed.
【０００７】[0007]
【実施例】以下、本発明の超電導応用装置の直流しゃ断
システムの一実施例を、図１及び図２を参照して説明す
る。図１において図３と同じ部分には、同一の符号を付
けてその説明は省略する。図１で図３と異なる点は、コ
ンデンサ充電電源10の内部に、主回路の通電電流を検出
するための検出器11からの出力を基に転流コンデンサ７
の充電電圧を制御する制御回路12を備えたことである。
図２は、主回路の通電電流と転流電流と転流電流を重畳
したときのしゃ断電流の関係を表した図である。従来の
ように充電電圧を制御しない場合は、転流電流は最大通
電電流を基に決定され、不変である。しゃ断時に主回路
の通電電流が変化して小さい場合は、図２に示すように
しゃ断器を流れる電流が零点を横切る近傍のｄｉ／ｄｔ
値が大きくなるため、しゃ断は不確実になる。しかし、
主回路の通電電流を検出し、その値に応じて転流コンデ
ンサの充電電圧を制御すれば、電流零点近傍のｄｉ／ｄ
ｔ値は、しゃ断器の許容するｄｉ／ｄｔ値に抑えること
が可能となる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a DC cutoff system for a superconducting application device according to the present invention will be described below with reference to FIGS. In FIG. 1, the same parts as those in FIG. 3 are designated by the same reference numerals and the description thereof will be omitted. The difference between FIG. 1 and FIG. 3 is that the commutation capacitor 7 is provided inside the capacitor charging power source 10 on the basis of the output from the detector 11 for detecting the energizing current of the main circuit.
That is, the control circuit 12 for controlling the charging voltage of is provided.
FIG. 2 is a diagram showing the relationship between the conduction current of the main circuit, the commutation current, and the breaking current when the commutation current is superimposed. When the charging voltage is not controlled as in the conventional case, the commutation current is determined based on the maximum energizing current and is unchanged. When the current flowing through the main circuit changes and is small at the time of interruption, di / dt near the point where the current flowing through the interrupter crosses the zero point
The higher the value, the more uncertain the interruption. But,
If the energizing current of the main circuit is detected and the charging voltage of the commutation capacitor is controlled according to the value, di / d near the current zero point
The t value can be suppressed to the di / dt value allowed by the circuit breaker.
【０００８】転流コンデンサ充電電源10は、しゃ断時の
転流電流を最適な値にするために、主回路の通電電流に
対応させて転流コンデンサの充電電圧を制御する。例え
ば、充電電源を順変換装置及び逆変換装置から構成する
ことにより、主回路の通電電流の減少時には逆変換装置
により転流コンデンサを放電し、増加時には、順変換装
置により充電することで、転流コンデンサ充電電圧を最
適な値に制御することが可能となる。The commutation capacitor charging power supply 10 controls the charging voltage of the commutation capacitor in accordance with the energizing current of the main circuit in order to make the commutation current at the time of interruption an optimum value. For example, by configuring the charging power source with a forward conversion device and a reverse conversion device, the reverse conversion device discharges the commutation capacitor when the energizing current of the main circuit decreases, and when it increases, the forward conversion device charges the commutation capacitor to convert the current. It is possible to control the charging voltage of the flow capacitor to an optimum value.
【０００９】なお、充電電源の構成としては、順変換装
置と放電抵抗により構成し、コンデンサ充電電圧を制御
しても同様の効果が期待できる。また、転流コンデンサ
の容量または転流リアクトルの容量を可変にしてこれら
を制御しても同様の効果が期待できる。It should be noted that the same effect can be expected if the charging power source is composed of a forward converter and a discharge resistor and the capacitor charging voltage is controlled. Further, the same effect can be expected by varying the capacity of the commutation condenser or the capacity of the commutation reactor to control them.
【００１０】[0010]
【発明の効果】本発明によれば、主回路の通電電流に対
応して転流コンデンサ充電電圧を制御できるので、主回
路の通電電流に応じた最適な転流電流を重畳することが
でき、異常時に主回路を確実にしゃ断し、コイルを保護
することができる。According to the present invention, since the commutation capacitor charging voltage can be controlled according to the energizing current of the main circuit, it is possible to superimpose an optimum commutating current according to the energizing current of the main circuit. When abnormal, the main circuit can be cut off surely and the coil can be protected.
【図１】本発明の一実施例を示す超電導応用装置の構成
図。FIG. 1 is a configuration diagram of a superconducting application device showing an embodiment of the present invention.
【図２】主回路通電電流と転流電流としゃ断器の通電電
流の関係を示す図。FIG. 2 is a diagram showing a relationship between a main circuit energization current, a commutation current, and an energization current of a circuit breaker.
【図３】従来の超電導応用装置の一実施例を示す構成
図。FIG. 3 is a configuration diagram showing an embodiment of a conventional superconducting application device.
【図４】従来の直流しゃ断器の一実施例を示す構成図。FIG. 4 is a configuration diagram showing an embodiment of a conventional DC breaker.
１…超電導コイル、２…直流しゃ断器、３…励磁電源、
４…スイッチ、５…減衰抵抗、６…転流リアクトル、７
…転流コンデンサ、８…投入スイッチ、９…コンデンサ
充電電源、10…コンデンサ充電電源、11…検出器、12…
制御回路。1 ... Superconducting coil, 2 ... DC breaker, 3 ... Excitation power supply,
4 ... switch, 5 ... damping resistance, 6 ... commutation reactor, 7
... commutation capacitor, 8 ... closing switch, 9 ... capacitor charging power supply, 10 ... capacitor charging power supply, 11 ... detector, 12 ...
Control circuit.
Claims (5)
磁する励磁電源と、前記超電導コイルと前記励磁電源の
間に介在し主回路電流をしゃ断する機能を有するしゃ断
器と、前記しゃ断器に並列に接続され、主回路電流をし
ゃ断する際にしゃ断器の接点間に逆方向電流を重畳する
転流コンデンサとを有する強制転流回路と、前記転流コ
ンデンサに電荷を蓄積する充電電源と、転流コンデンサ
の充電電圧を主回路電流に応じて制御する制御回路とを
備えたことを特徴とする超電導応用装置の直流しゃ断シ
ステム。1. A superconducting coil, an exciting power source for exciting the superconducting coil, a breaker interposed between the superconducting coil and the exciting power source to cut off a main circuit current, and in parallel with the breaker. A forced commutation circuit that is connected and that has a commutation capacitor that superimposes a reverse current between the contacts of the circuit breaker when cutting off the main circuit current; a charging power supply that accumulates charges in the commutation capacitor; A DC cutoff system for a superconducting application device, comprising: a control circuit for controlling a charging voltage of a capacitor according to a main circuit current.
を、順変換装置及び逆変換装置で構成することを特徴と
する請求項１記載の超電導応用装置の直流しゃ断システ
ム。2. The DC cutoff system for a superconducting application apparatus according to claim 1, wherein the control circuit for controlling the charging voltage of the commutation capacitor comprises a forward converter and an inverse converter.
を、順変換器及び放電抵抗で構成することを特徴とする
請求項１記載の超電導応用装置の直流しゃ断システム。3. The DC cutoff system for a superconducting application device according to claim 1, wherein the control circuit for controlling the charging voltage of the commutation capacitor comprises a forward converter and a discharge resistor.
ンデンサ容量を制御することを特徴とする請求項１記載
の超電導応用装置の直流しゃ断システム。4. The DC cutoff system for a superconducting application device according to claim 1, wherein the control circuit controls the capacity of the commutation capacitor according to the main circuit current.
アクトル容量を制御することを特徴とする請求項１記載
の超電導応用装置の直流しゃ断システム。5. The DC cutoff system for a superconducting application apparatus according to claim 1, wherein the control circuit controls the commutation reactor capacity according to the main circuit current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5321960A JPH07177648A (en) | 1993-12-21 | 1993-12-21 | Dc interrupting system for superconducting unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5321960A JPH07177648A (en) | 1993-12-21 | 1993-12-21 | Dc interrupting system for superconducting unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07177648A true JPH07177648A (en) | 1995-07-14 |
Family
ID=18138353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5321960A Pending JPH07177648A (en) | 1993-12-21 | 1993-12-21 | Dc interrupting system for superconducting unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07177648A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011205887A (en) * | 2010-03-25 | 2011-10-13 | Abb Schweiz Ag | Bridging unit |
| CN105244219A (en) * | 2014-07-02 | 2016-01-13 | 株式会社日立制作所 | Commutation type direct current breaker and monitoring method of the same |
| EP3739706A4 (en) * | 2018-09-12 | 2021-06-16 | Shandong Power Equipment Co., Ltd. | Control and protection system for mechanical high-voltage direct current circuit breaker, and control method for same |
| WO2022218575A1 (en) * | 2021-04-17 | 2022-10-20 | Eaton Intelligent Power Limited | Direct current quenching at a disconnector switch |
-
1993
- 1993-12-21 JP JP5321960A patent/JPH07177648A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011205887A (en) * | 2010-03-25 | 2011-10-13 | Abb Schweiz Ag | Bridging unit |
| CN105244219A (en) * | 2014-07-02 | 2016-01-13 | 株式会社日立制作所 | Commutation type direct current breaker and monitoring method of the same |
| CN105244219B (en) * | 2014-07-02 | 2017-09-19 | 株式会社日立产机系统 | Commutation type DC breaker and its monitoring method |
| EP3739706A4 (en) * | 2018-09-12 | 2021-06-16 | Shandong Power Equipment Co., Ltd. | Control and protection system for mechanical high-voltage direct current circuit breaker, and control method for same |
| WO2022218575A1 (en) * | 2021-04-17 | 2022-10-20 | Eaton Intelligent Power Limited | Direct current quenching at a disconnector switch |
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