JP2007267534A - Superconducting current limiter - Google Patents

Superconducting current limiter Download PDF

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JP2007267534A
JP2007267534A JP2006090859A JP2006090859A JP2007267534A JP 2007267534 A JP2007267534 A JP 2007267534A JP 2006090859 A JP2006090859 A JP 2006090859A JP 2006090859 A JP2006090859 A JP 2006090859A JP 2007267534 A JP2007267534 A JP 2007267534A
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current limiting
superconducting current
superconducting
switch
switches
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JP4621619B2 (en
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Katsumasa Araoka
勝政 荒岡
Takashi Yazawa
孝 矢澤
Masami Urata
昌身 浦田
Ryoichi Sugawara
良市 菅原
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Toshiba Corp
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    • 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
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    • Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a superconducting current limiter capable of safely conducting maintenance operation while executing power supply, by solving the problem of the stagnation of power feeding on a demander load. <P>SOLUTION: The super-conducting current limiter comprises; a first and a second switches 4, 5 connected in series between a first and a second power systems 1, 10; a super-conducting current limiting element 9 accommodated in a refrigerant container 8 and connected between the first and the second switches 4, 5; a third switch 3 connected in parallel with the first switch 4, the super-conducting current limiting element 9 and the second switch 5; a refrigerator 7 refrigerating the super-conducting current limiting element 9; a detector 11 detecting the abnormality of the voltage or the current of the first power system 1; and a controller 12 receiving the output signal of the detector 11 and controlling opening/closing of the first, the second and the third switches 4, 5, 3. The device is configured to provide the first, the second and the third switches 4, 5, 3, the refrigerant container 8 and the refrigerator 7 within the same housing 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、超電導限流素子を備え電力系統に接続されて事故時に電力系統に流れる過大電流を所定値以下に抑制する超電導限流装置に関する。   The present invention relates to a superconducting current limiting device that includes a superconducting current limiting element and is connected to a power system and suppresses an excessive current flowing in the power system at the time of an accident to a predetermined value or less.

安定な電力を必要とする重要負荷を所有している電力需用家においては、落雷等の電力系統事故による瞬停や停電等の送電トラブルに備えるために自家発電装置を所有する需用家が増えてきている。自家発電装置は多くの場合、電力会社へ支払う電力料金を低減するために自家発電電力と電力会社電力の並行運転を行っている。このとき電力会社側系統に地絡や短絡等の事故が起こると、自家発電側から系統事故点へ向けて過大な電流が流れる危険がある。超電導限流装置は、この過大電流を瞬時に限流し抑制する静止器である。   For power customers who own important loads that require stable power, there are customers who own private power generators to prepare for power transmission problems such as power outages and power outages due to power system accidents such as lightning strikes. It is increasing. In many cases, the private power generation apparatus performs a parallel operation of the private power generation power and the power company power in order to reduce a power charge paid to the power company. At this time, if an accident such as a ground fault or a short circuit occurs in the power company side system, there is a risk that an excessive current flows from the private power generation side to the system fault point. The superconducting current limiting device is a stationary device that instantaneously limits and suppresses this excessive current.

超電導限流装置は、通常運転状態では抵抗のない超電導限流素子に系統電流を流すことでほとんど損失なく通電しているが、ひとたび系統事故が発生した場合には過大な事故電流で超電導限流素子が常電導転移（クエンチ）し、発生抵抗で事故電流を瞬時に所定電流値以下に抑制する。超電導限流素子の過大電流による常電導転移を利用するため検出手段を必要とせず、原理的に誤不動作がなく確実に保護動作することができる。事故時には、事故電流立上り第１波目から電流を抑制し、設計により通常使用電流の数倍程度に事故電流を抑制することが可能である。超電導限流素子の限流時の抵抗値は事故時に回路側で許容される電流の大きさにより決まり、概ね数Ω〜十数Ω程度である（例えば、特許文献１参照）。   The superconducting current limiting device is energized with almost no loss by supplying a system current to a superconducting current limiting element that does not have resistance in normal operation, but once a system fault occurs, the superconducting current limiting device has an excessive fault current. The element undergoes normal conduction transition (quenching), and the fault current is instantaneously suppressed to a predetermined current value or less by the generated resistance. Since the normal conduction transition due to the excessive current of the superconducting current limiting element is used, no detection means is required, and in principle, a protective operation can be reliably performed without malfunction. In the event of an accident, it is possible to suppress the current from the first wave of the accident current rising, and to suppress the accident current to about several times the normal operating current by design. The resistance value at the time of current limiting of the superconducting current limiting element is determined by the magnitude of current allowed on the circuit side at the time of an accident, and is approximately several Ω to several tens Ω (see, for example, Patent Document 1).

電気回路上は、超電導限流素子の電気抵抗が事故時に瞬時に回路に現れる超電導限流装置を実際の機器として実現するためには、超電導限流素子を収納するクライオスタットや冷凍機およびコンプレッサー、遮断器や断路器、検出器、シーケンス回路、電源機器等が必要である。電気機器としての超電導限流装置は、これらの構成要素を含む全体を組み合わせたものである。   On the electrical circuit, in order to realize a superconducting current limiting device, in which the electrical resistance of the superconducting current limiting device appears in the circuit instantaneously in the event of an accident, as a real device, a cryostat, refrigerator, compressor, and shutoff that contain the superconducting current limiting device Devices, disconnectors, detectors, sequence circuits, power supply devices, etc. are required. A superconducting current limiting device as an electric device is a combination of all of these components.

超電導限流装置が適用される態様のうち、需用家内の電力配電系統の保護用として設置されるのは、電圧階級が6.6ｋV〜66ｋV程度であることが多い。このような適用例では、たとえば、66ｋV〜77ｋV程度の電圧で電力会社側系統から工場内に受電し、工場内に6.6ｋVで給電する一方、工場内に設置した自家発電装置をこの6.6ｋV系統に連系して電力の一部または過半を供給するような構成として、事故電流の防止などの系統保護用に超電導限流装置が適用される。   Of the modes to which the superconducting current limiting device is applied, the voltage class is often set to about 6.6 kV to 66 kV for protection of the power distribution system in the consumer. In such an application, for example, power is received in the factory from the power company side system at a voltage of about 66 kV to 77 kV, and power is supplied to the factory at 6.6 kV, while the in-house power generator installed in the factory is installed in the 6.6 kV system. A superconducting current limiting device is applied for system protection, such as prevention of accident current, as a configuration in which a part or majority of electric power is supplied in conjunction with the system.

需用家内の配電系統などで使われる電力機器は通常建屋の内部に設置され、遮断器や変圧器等の単一の機器あるいは機能ごとにキュービクルと呼ばれる扉のついた箱型のケース（標準盤）に収納されて設置されることがほとんどである。機器類がキュービクルに収納されるのは、設置後にメンテナンス作業を行う作業者等が機器内や機器間の接続配線等に接触して感電することを防止する安全上の目的のほかに、機器の境界を作業者等に明確に認識させる役割や、設置後の構成機器が盤外にはみ出さないことによる安全通路の確保や、初期設置時や故障時などの運搬上のメリットなど、様々なメリットがあることによる。したがって、需用家内の配電系統の保護用に超電導限流装置が適用される場合には、他の変圧器や遮断器等の電力機器の設置態様と同様、超電導限流素子も標準のキュービクル内に収納されて適用に供されることが望ましい。   Power equipment used in power distribution systems in consumer homes is usually installed inside a building, and is a box-shaped case with a door called a cubicle for each single device or function, such as a circuit breaker or transformer (standard board) ) And are installed in most cases. The equipment is stored in the cubicle in addition to the safety purpose of preventing the operator who performs maintenance work after installation from touching the connection wiring in the equipment or between the equipment, etc. Various benefits, such as the role of clearly recognizing boundaries to workers, securing of a safe passage by preventing components after installation from protruding outside the panel, and transportation benefits during initial installation and failure Because there is. Therefore, when a superconducting current limiting device is applied to protect a distribution system in a consumer, the superconducting current limiting element is also installed in a standard cubicle as in the case of installation of power equipment such as other transformers and circuit breakers. It is desirable to be housed in an application for application.

超電導限流素子がキュービクル内に収容されて設置されると、超電導コイル等からなる限流素子を収納するクライオスタットや冷凍機コンプレッサー等、限流装置内の構成機器間の配線や配管が外部に露出することなく、作業者等がこれらに足を引っ掛けたり、コンプレッサーの電源スイッチに誤って接触してスイッチを切ってしまったりするトラブルを防止することができる。また、クライオスタット等重量の大きい構成機器を収納した状態で運搬できる場合には、機器内の配線や配管類をあらかじめ接続し、液体窒素などの冷媒を収納した状態で工場から設置サイトまで運搬することができ、冷却系のトラブルの機会を大幅に減らせるメリットもある。
特許第３１０８４４０号公報 When a superconducting current limiting element is housed and installed in a cubicle, the wiring and piping between components in the current limiting device such as a cryostat and a refrigerator compressor that houses the current limiting element composed of a superconducting coil, etc. are exposed to the outside. Without trouble, it is possible to prevent troubles such as an operator getting caught in these parts or accidentally touching the power switch of the compressor and turning it off. In addition, if heavy components such as cryostats can be transported in a housed state, the wiring and piping in the equipment must be connected in advance and transported from the factory to the installation site with a refrigerant such as liquid nitrogen in place. This has the advantage of greatly reducing the chance of cooling system troubles.
Japanese Patent No. 3108440

上述のように、超電導限流装置をキュービクルタイプに構成するといろいろメリットがあるが、超電導限流素子を電力機器のキュービクル内に収納して使用するためには、大きな問題が発生する。それは、液体窒素などの冷媒の蒸発ガスを液化再凝縮して冷媒の注液を不要とする冷凍機ヘッドと冷凍機コンプレッサーは、定期的に運転を停止させてメンテナンスを実施することが必要であることにより生じる問題である。   As described above, there are various merits when the superconducting current limiting device is configured as a cubicle type, but a large problem occurs when the superconducting current limiting device is housed in a cubicle of a power device. The refrigeration machine head and the refrigeration machine compressor, which do not require refrigerant injection by liquefying and re-condensing the evaporative gas of the refrigerant such as liquid nitrogen, need to be periodically stopped for maintenance. This is a problem caused by

超電導限流装置は直列機器であるため、ほとんどすべてのケースにおいて平常時には常時電流を流し続ける責務を負う。冷媒が液体窒素の場合の冷凍機ヘッドのメンテナンス間隔は１年に約１回であり、メンテナンスを実施するための時間は半日間程度以下であるが、限流装置が適用される電力系統は一般的にこの時間も通電を停止することは許されない。ところが、冷凍機のメンテナンスを実施するために開放することが必要なキュービクルのドアは、開放時には自動的に回路全体を遮断するように設定されているので、メンテナンスを実施するためにキュービクルのドアを開けると、自動的に電源等が遮断され、限流装置はOFFの状態にきりかわってしまう。逆に冷凍機のメンテナンスを実施する際に、電流端子等が課電状態になっていると、メンテナンスの実施中に誤って課電部に接触して大事故につながる恐れがあり、大変危険である。このように、定期的に冷凍機のメンテナンスを実施する際に、盤をあけた際、系統回路に問題を起こさないような設定ができないと、機器の安全な運用と、地絡時の事故時の確実な系統保護ができないという問題がある。   Since the superconducting current limiting device is a series device, in almost all cases, it has a responsibility to keep the current flowing at all times. When the refrigerant is liquid nitrogen, the maintenance interval of the refrigerator head is about once a year, and the maintenance time is about half a day or less, but the power system to which the current limiting device is applied is generally Therefore, it is not allowed to stop energization during this time. However, cubicle doors that need to be opened to perform maintenance of the refrigerator are set to automatically shut off the entire circuit when opened, so the cubicle door must be opened to perform maintenance. When it is opened, the power supply is automatically shut off and the current limiting device is switched off. Conversely, when carrying out maintenance of the refrigerator, if the current terminal etc. is in the state of power application, there is a risk of accidental contact with the power application unit during maintenance, leading to a major accident, which is very dangerous. is there. In this way, when carrying out regular maintenance of the refrigerator, when the panel is opened, if settings that do not cause problems with the system circuit are not possible, safe operation of the equipment and in the event of a ground fault However, there is a problem that reliable system protection is not possible.

本発明は、電力系統の地絡等の事故時に需用家負荷に電力供給が滞る問題を解決し、電力供給を行いつつ安全にメンテナンス作業を行うことができる超電導限流装置を提供することを目的とする。   The present invention provides a superconducting current limiting device that solves the problem of power supply stagnation in consumer loads in the event of an accident such as a ground fault in the power system, and that can perform maintenance work safely while supplying power. Objective.

上記課題を解決するために、本発明の超電導限流装置は、第１および第２の電力系統の間に直列に接続された第１および第２の開閉器と、冷凍容器に収容され前記第１および第２の開閉器の間に接続された超電導限流素子と、前記第１の開閉器、前記超電導限流素子および前記第２の開閉器と並列に接続された第３の開閉器と、前記超電導限流素子を冷却する冷凍機と、前記第１の電力系統の電圧または電流の異常を検出する検出器と、前記検出器の出力信号を受けて前記第１、第２、第３の開閉器を開閉制御する制御装置とを備え、前記第１、第２、第３の開閉器と前記冷凍容器と前記冷凍機は同一の筐体内に設けられている構成とする。   In order to solve the above problems, a superconducting current limiting device according to the present invention includes first and second switches connected in series between first and second power systems, and a first container housed in a freezing container. A superconducting current limiting element connected between the first and second switches; a third switch connected in parallel with the first switch, the superconducting current limiting element, and the second switch; , A refrigerator that cools the superconducting current limiting element, a detector that detects an abnormality in the voltage or current of the first power system, and the first, second, and third receiving the output signal of the detector And the first, second, and third switches, the refrigeration container, and the refrigerator are provided in the same casing.

本発明によれば、電力系統の地絡等の事故時に需用家負荷に電力供給が滞る問題を解決し、電力供給を行いつつ安全にメンテナンス作業を行うことができる超電導限流装置を提供することができる。   According to the present invention, there is provided a superconducting current limiting device that solves the problem of power supply stagnation in a consumer load at the time of an accident such as a ground fault of a power system and can perform maintenance work safely while supplying power. be able to.

本発明の実施の形態の超電導限流装置を図１を参照して説明する。すなわち、図１に示すように、第１の電力系統である商用電力系統１より筐体２内の遮断器３および遮断器４の一次側に系統電力が供給されている。遮断器４の二次側には冷凍容器８内に設けられた超電導限流素子９が接続され、超電導限流素子９の出力側は断路器または遮断器５の一次側に接続され、断路器または遮断器５の二次側には第２の電力系統である自家発電装置１０と需要化重要負荷１３が接続されている。   A superconducting current limiting device according to an embodiment of the present invention will be described with reference to FIG. That is, as shown in FIG. 1, system power is supplied to the primary side of the circuit breaker 3 and circuit breaker 4 in the housing 2 from the commercial power system 1 which is the first power system. A superconducting current limiting element 9 provided in the cryocontainer 8 is connected to the secondary side of the circuit breaker 4, and the output side of the superconducting current limiting element 9 is connected to the primary side of the disconnector or circuit breaker 5. Alternatively, a private power generation apparatus 10 that is a second power system and a demanding important load 13 are connected to the secondary side of the circuit breaker 5.

商用電力系統１の電圧または電流は異常検出器１１によって検出され制御回路１２に入力されて常に瞬時電圧値または電流値が監視され電力系統異常を監視する。需用家重要負荷１３には需用家の自家発電装置１０が接続され、商用電力系統１との並行運転が行われる。遮断器３は通常時は開状態であるが、閉状態とすることで超電導限流素子９を経由せずに２つの電力系統間を接続するバイパス回路を形成する。遮断器４は第１の開閉器であり、断路器または遮断器５は第２の開閉器であり、遮断器５は第３の開閉器である。   The voltage or current of the commercial power system 1 is detected by the abnormality detector 11 and input to the control circuit 12, and the instantaneous voltage value or current value is constantly monitored to monitor the power system abnormality. The consumer's own load generator 10 is connected to the consumer's important load 13, and parallel operation with the commercial power system 1 is performed. The circuit breaker 3 is normally open but is closed to form a bypass circuit that connects the two power systems without going through the superconducting current limiting element 9. The circuit breaker 4 is a first switch, the disconnector or circuit breaker 5 is a second switch, and the circuit breaker 5 is a third switch.

筐体２内において遮断器３、遮断器４および断路器または遮断器５を収納する部分と冷凍容器８および極低温冷凍機７を収納する部分とは隔壁６で分離されている。また筐体２は、超電導限流装置が、「通常状態」、「限流状態」、「バイパス運転状態」、「休止状態」等を明記する表示を前面に備え、「バイパス運転状態」、「休止状態」のときにのみに開くことができるドアスイッチを具備している。   In the housing 2, a part for housing the circuit breaker 3, the circuit breaker 4 and the disconnector or circuit breaker 5 and a part for housing the freezing container 8 and the cryogenic refrigerator 7 are separated by a partition wall 6. In addition, the casing 2 is provided with a display on the front surface of the superconducting current limiting device that clearly indicates “normal state”, “current limiting state”, “bypass operation state”, “resting state”, etc., and “bypass operation state”, “ It is equipped with a door switch that can be opened only when it is in “rest state”.

また図２に示すように、冷凍容器８の上部に設置し超電導限流素子９と接続するための３対の電流端子１７は、冷凍容器８の上部フランジに軸対称ではなく超電導限流素子９の電極引き外し機構２０に近い位置に設けられている。   As shown in FIG. 2, the three pairs of current terminals 17 installed on the top of the cryocontainer 8 and connected to the superconducting current limiting element 9 are not axially symmetric with the superconducting current limiting element 9 on the upper flange of the freezing container 8. Is provided at a position close to the electrode tripping mechanism 20.

冷凍容器８の電流端子１７に接続された電線は隔壁６に取り付けたコネクタで容易に着脱できる構成になっている。あるいは隔壁６に貫通用ブッシングを設けることにより、高電圧電線または導体ブスバーを隔壁６に通す。冷凍容器８はキャスターまたはレールによって移動可能な構造とし、筐体２外に搬出して筐体２外でメンテナンス作業を行うことができる構成になっている。   The electric wire connected to the current terminal 17 of the cryocontainer 8 can be easily attached and detached with a connector attached to the partition wall 6. Alternatively, a high voltage electric wire or a conductor bus bar is passed through the partition wall 6 by providing a through bushing on the partition wall 6. The cryocontainer 8 is configured to be movable by a caster or a rail, and is configured to be carried out of the housing 2 and to perform maintenance work outside the housing 2.

遮断器３，４および断路器または遮断器５は、メンテナンス時に筐体２から電気回路的に完全に開となる断路位置に引き出すことにより完全に電気的分離ができ、且つマイクロスイッチ等の位置スイッチによってメンテナンス作業部に高電圧課電部がないことを表示し、電気的ドアロックを解除できる機能を有する構成になっている。   The circuit breakers 3 and 4 and the circuit breaker or circuit breaker 5 can be completely electrically separated by pulling them from the housing 2 to the disconnection position where the circuit is completely opened during maintenance, and a position switch such as a micro switch. Therefore, the maintenance work unit displays that there is no high voltage power application unit, and has a function of releasing the electrical door lock.

本実施の形態の超電導限流装置を電力システム内の所定の場所に設置する工程としては、まず筐体２を設置し、その後に超電導限流素子９を収納した冷凍容器８、極低温冷凍機７、遮断器３，４および断路器または遮断器５を筐体２に設置する。   As a process of installing the superconducting current limiting device of the present embodiment at a predetermined location in the power system, first, the housing 2 is installed, and then the cryocontainer 8 containing the superconducting current limiting element 9 and the cryogenic refrigerator. 7. The circuit breakers 3 and 4 and the disconnector or circuit breaker 5 are installed in the housing 2.

上記のように構成された本実施の形態の超電導限流装置において、通常状態では商用電力系統１から遮断器４、超電導限流素子９および断路器または遮断器５を介して需用家重要負荷１３に電力供給されている。このとき商用電力系統１側で地絡や短絡等の事故が起こると、自家発電装置１０側から系統事故点へ向けて短絡大電流が流れ始める。この事故電流が超電導限流素子９の設計設定値を超えると、超電導限流素子９は抵抗ゼロの超電導状態から常電導状態へ移行し（クエンチ）、数Ω〜十数Ωの抵抗を発生し事故電流を第一波の立上りから限流する。制御装置１２は、限流動作時点から数十ｍ秒後に遮断器４および断路器または遮断器５を開にして商用電力系統１より自家発電装置１０および需用家重要負荷１３を切離す。このようにして、系統事故時にも需用家重要負荷１３には自家発電装置１０より電力が瞬断することなく供給され続ける。   In the superconducting current limiting device according to the present embodiment configured as described above, in a normal state, a consumer important load is supplied from the commercial power system 1 through the circuit breaker 4, the superconducting current limiting element 9, and the disconnector or circuit breaker 5. 13 is supplied with electric power. At this time, when an accident such as a ground fault or a short circuit occurs on the commercial power system 1 side, a short-circuit large current starts to flow from the private power generation device 10 side to the system fault point. When this fault current exceeds the design setting value of the superconducting current limiting element 9, the superconducting current limiting element 9 shifts from the superconducting state with zero resistance to the normal conducting state (quenching), and generates a resistance of several Ω to several tens of Ω. Limit the accident current from the rise of the first wave. The control device 12 opens the circuit breaker 4 and the disconnector or circuit breaker 5 several tens of milliseconds after the current-limiting operation time, and disconnects the private power generation device 10 and the consumer important load 13 from the commercial power system 1. In this way, electric power continues to be supplied from the private power generation apparatus 10 to the consumer critical load 13 without any instantaneous interruption even during a system failure.

商用電力系統１の地絡や短絡が遠方で起こった場合や事故の状態により、過大な事故電流ではなく常電導転移ギリギリで超電導限流素子９が超電導状態を維持することもありうるが、この場合も需用家の自家発電装置１０から事故電流が事故点に向かい流れ出る可能性がある。そうした場合にも、商用電力系統１の電圧または電流を常に監視している異常検出器１１で検出し、波形異常の場合、制御回路１２で遮断器４および断路器または遮断器５を動作させ、商用電力系統１から需用家重要負荷１３および自家発電装置１０を速やかに切離し、需用家重要負荷１３に影響のないようにする。   If the ground fault or short circuit of the commercial power system 1 occurs in the distance or the state of the accident, it is possible that the superconducting current limiting element 9 maintains the superconducting state at the normal conduction transition rather than an excessive accident current. Even in this case, there is a possibility that the accident current flows out from the consumer power generation device 10 of the consumer toward the accident point. Even in such a case, the abnormality detector 11 that constantly monitors the voltage or current of the commercial power system 1 is detected, and in the case of a waveform abnormality, the circuit breaker 4 and the disconnector or circuit breaker 5 are operated by the control circuit 12, The consumer important load 13 and the private power generator 10 are quickly disconnected from the commercial power system 1 so that the consumer important load 13 is not affected.

超電導限流装置には１回／半年の頻度で極低温冷凍機７の定期検査が機能確保上必要となる。この場合にも需用家重要負荷１３には継続して電力供給が必要である一方、メンテナンス時に高電圧課電部近接作業等は法律上・安全上問題がある。このようなメンテナンス時には、遮断器３を閉にし、遮断器４および断路器または遮断器５を開にし、隔壁６で仕切られている冷凍容器８と極低温冷凍機７には電圧が印加されない状態にして、安全にメンテナンス作業を行うことができる。メンテナンス作業中にも異常検出器１１と制御回路１２は継続動作させて系統事故による波形異常を監視し、異常時には遮断器３を開き自家発電装置１０から事故電流の流出を防ぎ、需用家重要負荷１３を保護する。   The superconducting current limiting device requires periodic inspection of the cryogenic refrigerator 7 once a half year for ensuring the function. In this case as well, the customer's important load 13 needs to be continuously supplied with electric power, but there is a legal and safety problem in the proximity work of the high voltage power supply unit during maintenance. During such maintenance, the circuit breaker 3 is closed, the circuit breaker 4 and the disconnector or circuit breaker 5 are opened, and no voltage is applied to the cryocontainer 8 and the cryogenic refrigerator 7 partitioned by the partition wall 6. Thus, maintenance work can be performed safely. During the maintenance work, the abnormality detector 11 and the control circuit 12 are continuously operated to monitor the waveform abnormality due to the system fault, and when the abnormality occurs, the circuit breaker 3 is opened to prevent the accidental current from flowing out of the private power generation device 10, which is important for consumers. The load 13 is protected.

なお、本実施の形態の超電導限流装置は、図３に示すように、商用電力系統１との間に外付け遮断器１４を接続してもよい。また、図４に示すように、超電導限流素子９に高電圧スイッチ１５を介して接続した定電流電源１６を設けた構成とし、超電導限流素子９が限流動作後、制御装置１２により遮断器４および断路器または遮断器５を動作させ超電導限流素子９を商用電力系統１から切離し、その後、高電圧スイッチ１５を閉状態として超電導限流素子９に定電流電源１６より設定電流を供給し、その後発生電圧を観測し、発生電圧が所定電圧より低下し、且つ商用電力系統１の異常が解除した場合に、超電導限流素子９と商用電力系統１との再接続を行うようにしてもよい。   Note that the superconducting current limiting device of the present embodiment may connect an external circuit breaker 14 to the commercial power system 1 as shown in FIG. Further, as shown in FIG. 4, a constant current power supply 16 connected to the superconducting current limiting element 9 via a high voltage switch 15 is provided, and the superconducting current limiting element 9 is interrupted by the control device 12 after the current limiting operation. The superconducting current limiting element 9 is disconnected from the commercial power system 1 by operating the circuit 4 and the disconnector or circuit breaker 5, and then the high voltage switch 15 is closed to supply the set current from the constant current power supply 16 to the superconducting current limiting element 9. Then, the generated voltage is observed, and when the generated voltage falls below a predetermined voltage and the abnormality of the commercial power system 1 is released, the superconducting current limiting element 9 and the commercial power system 1 are reconnected. Also good.

上記説明のように、本実施の形態の超電導限流装置によれば、電力系統の地絡等の事故時に需用家負荷に電力供給が滞る問題を解決し、電力供給を行いつつ安全にメンテナンス作業を行うことができる。   As described above, according to the superconducting current limiting device of the present embodiment, it solves the problem of power supply stagnation in the consumer load in the event of an accident such as a ground fault in the power system, and performs maintenance safely while supplying power. Work can be done.

本発明の実施の形態の超電導限流装置の構成を示す回路図。The circuit diagram which shows the structure of the superconducting current limiting device of embodiment of this invention. 本発明の実施の形態の超電導限流装置に備えられる冷凍容器の上部平面図。The upper top view of the freezing container with which the superconducting current limiting device of embodiment of this invention is equipped. 本発明の実施の形態の第１の変形例の超電導限流装置の構成を示す回路図。The circuit diagram which shows the structure of the superconducting fault current limiter of the 1st modification of embodiment of this invention. 本発明の実施の形態の第２の変形例の超電導限流装置の構成を示す回路図。The circuit diagram which shows the structure of the superconducting fault current limiter of the 2nd modification of embodiment of this invention.

符号の説明Explanation of symbols

１…商用電力系統、２…筐体、３，４…遮断器、５…断路器または遮断器、６…隔壁、７…極低温冷凍機、８…冷凍容器、９…限流素子、１０…自家発電装置、１１…異常検出器、１２…制御装置、１３…需用家重要負荷、１４…外付け遮断器、１５…高電圧スイッチ、１６…定電流電源、１７…電流端子、１８…冷凍機ヘッド、２０…電極引外し機構。

DESCRIPTION OF SYMBOLS 1 ... Commercial power system, 2 ... Housing | casing, 3, 4 ... Circuit breaker, 5 ... Disconnector or circuit breaker, 6 ... Bulkhead, 7 ... Cryogenic refrigerator, 8 ... Freezing container, 9 ... Current limiting element, 10 ... In-house power generator, 11 ... Abnormality detector, 12 ... Control device, 13 ... Consumer critical load, 14 ... External circuit breaker, 15 ... High voltage switch, 16 ... Constant current power supply, 17 ... Current terminal, 18 ... Refrigeration Machine head, 20 ... Electrode tripping mechanism.

Claims (10)

第１および第２の電力系統の間に直列に接続された第１および第２の開閉器と、冷凍容器に収容され前記第１および第２の開閉器の間に接続された超電導限流素子と、前記第１の開閉器、前記超電導限流素子および前記第２の開閉器と並列に接続された第３の開閉器と、前記超電導限流素子を冷却する冷凍機と、前記第１の電力系統の電圧または電流の異常を検出する検出器と、前記検出器の出力信号を受けて前記第１、第２、第３の開閉器を開閉制御する制御装置とを備え、前記第１、第２、第３の開閉器と前記冷凍容器と前記冷凍機は同一の筐体内に設けられていることを特徴とする超電導限流装置。   First and second switches connected in series between the first and second power systems, and a superconducting current limiting element housed in a freezing container and connected between the first and second switches A third switch connected in parallel with the first switch, the superconducting current limiting element and the second switch, a refrigerator for cooling the superconducting current limiting element, and the first switch A detector for detecting an abnormality in a voltage or current of a power system; and a control device that controls opening and closing of the first, second, and third switches in response to an output signal of the detector; The superconducting current limiting device, wherein the second and third switches, the freezing container, and the refrigerator are provided in the same casing. 前記第１および第２の開閉器を開状態とすることにより前記超電導限流素子は前記第１、第２の電力系統から切離されることを特徴とする請求項１記載の超電導限流装置。   2. The superconducting current limiting device according to claim 1, wherein the superconducting current limiting element is disconnected from the first and second electric power systems by opening the first and second switches. 前記第３の開閉器を閉状態とすることで前記超電導素子を経由せずに前記第１および第２の電力系統間を接続するパイバス回路を形成することを特徴とする請求項１記載の超電導限流装置。   2. The superconductivity according to claim 1, wherein the third switch is closed to form a Pibus circuit that connects the first and second power systems without going through the superconducting element. Current limiting device. 前記超電導限流素子にスイッチを介して接続された定電流電源を設け、前記超電導限流素子が限流動作後、前記制御装置により前記第１および第２の開閉器を動作させて前記超電導限流素子を前記第１および第２の電力系統から切離し、その後前記スイッチを閉状態として前記超電導限流素子に前記定電流電源より電流を供給し、電力系統異常が解除したのちに、前記超電導限流素子を前記第１および第２の電力系統と再接続することを特徴とする請求項１記載の超電導限流装置。   A constant current power source connected to the superconducting current limiting element via a switch is provided, and after the superconducting current limiting element has performed a current limiting operation, the controller controls the first and second switches to operate the superconducting current limiting element. The current element is disconnected from the first and second power systems, and then the switch is closed to supply current from the constant current power source to the superconducting current limiting element. 2. The superconducting current limiting device according to claim 1, wherein a current element is reconnected to the first and second electric power systems. 前記筐体は、前記第１、第２、第３の開閉器と前記冷凍容器および前記冷凍機を分離する隔壁を備えていることを特徴とする請求項１記載の超電導限流装置。   2. The superconducting current limiting device according to claim 1, wherein the casing includes a partition that separates the first, second, and third switches, the cryocontainer, and the refrigerator. 前記隔壁は、前記冷凍容器の電流端子に接続されたリード線が接続されるコネクタを備えていることを特徴とする請求項５記載の超電導限流装置。   The superconducting current limiting device according to claim 5, wherein the partition wall includes a connector to which a lead wire connected to a current terminal of the cryocontainer is connected. 前記冷凍容器を移動させるキャスターまたはレールを備えていることを特徴とする請求項１記載の超電導限流装置。   The superconducting current limiting device according to claim 1, further comprising a caster or a rail for moving the cryocontainer. 前記冷凍容器の電流端子は前記超電導限流素子の電極引外し機構に近い位置に設けられていることを特徴とする請求項１記載の超電導限流装置。   2. The superconducting current limiting device according to claim 1, wherein a current terminal of the cryocontainer is provided at a position close to an electrode tripping mechanism of the superconducting current limiting element. 前記筐体は、運転状態を表示する表示器と、バイパス運転状態または休止状態のときにのみに開くことができるドアスイッチとを備えていることを特徴とする請求項１記載の超電導限流装置。   2. The superconducting current limiting device according to claim 1, wherein the housing includes an indicator that displays an operation state, and a door switch that can be opened only in a bypass operation state or a hibernation state. . 前記筐体は、前記筐体内への課電を絶つドアロック装置と、前記筐体内への課電の有無を表示するための位置スイッチとを備えていることを特徴とする請求項１記載の超電導限流装置。

The said housing | casing is provided with the door lock apparatus which cuts off the electricity application in the said housing | casing, and the position switch for displaying the presence or absence of the electricity application in the said housing | casing. Superconducting current limiting device.

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