JPH05236646A - Current limiter - Google Patents
Current limiterInfo
- Publication number
- JPH05236646A JPH05236646A JP4034998A JP3499892A JPH05236646A JP H05236646 A JPH05236646 A JP H05236646A JP 4034998 A JP4034998 A JP 4034998A JP 3499892 A JP3499892 A JP 3499892A JP H05236646 A JPH05236646 A JP H05236646A
- Authority
- JP
- Japan
- Prior art keywords
- current limiting
- current
- limiting unit
- accident
- reclosing
- 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
-
- 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
- Emergency Protection Circuit Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、交流電路の事故時に過
大な事故電流が流れるのを抑制する限流装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current limiting device which suppresses an excessive fault current from flowing when a fault occurs in an AC circuit.
【０００２】[0002]
【従来の技術】この種の従来の装置として、例えば、特
開平２−１０１９２６号公報に記載されたものがある。
図８はこの限流装置を示したものである。同図におい
て、１００ａは電路の電流の流れを制限値以下に抑える
インダクタンスを有し、かつこの制限値以上の臨界電流
値を持つ超電導コイルであって、１００ｂは無誘導に形
成され、前記制限値より小さく、通常電流よの大きい臨
界電流値を持つ超電導スイッチであり、超電導コイル１
００ａと並列に接続されている。2. Description of the Related Art As a conventional device of this type, for example, there is one described in Japanese Patent Application Laid-Open No. 2-101926.
FIG. 8 shows this current limiting device. In the figure, 100a is a superconducting coil that has an inductance that keeps the current flow in an electric circuit below a limit value and that has a critical current value that is greater than or equal to this limit value. It is a superconducting switch that has a critical current value that is smaller and larger than the normal current.
00a is connected in parallel.
【０００３】この構成において、超電導コイル１００ａ
および超電導スイッチ１００ｂが共に超電導状態にある
時、線路を流れる電流に対して超電導コイル１００ａは
比較的大きなインピーダンスを示すが、超電導スイッチ
１００ｂは無誘導であることから、インピーダンスは実
質的に零になる。負荷２の短絡事故等により線路に過電
流が流れ、その値が超電導スイッチ１００ｂの臨界電流
値を超えると、超電導スイッチ１００ｂが瞬時にクエン
チし、極めて大きな抵抗体になる。その結果、超電導ス
イッチ１００ｂに流れていた電流の殆どが超電導コイル
１００ａに転流する。従って、超電導コイル１００ａの
インダクタンスにより線路電流が上記制限値に抑制され
る。この時、超電導スイッチ１００ｂに流れる電流は極
めて小さく、熱として消費される電力損失は僅かなもの
となる。電流が制限された後、遮断器１０２が事故電流
を遮断する。In this structure, the superconducting coil 100a
When both the superconducting switch 100b and the superconducting switch 100b are in the superconducting state, the superconducting coil 100a exhibits a relatively large impedance with respect to the current flowing through the line, but since the superconducting switch 100b is non-inductive, the impedance becomes substantially zero. .. When an overcurrent flows in the line due to a short circuit of the load 2 or the like and the value exceeds the critical current value of the superconducting switch 100b, the superconducting switch 100b is instantly quenched and becomes an extremely large resistor. As a result, most of the current flowing in the superconducting switch 100b is commutated to the superconducting coil 100a. Therefore, the line current is suppressed to the above limit value by the inductance of the superconducting coil 100a. At this time, the current flowing through the superconducting switch 100b is extremely small, and the power loss consumed as heat is small. After the current is limited, the circuit breaker 102 interrupts the fault current.
【０００４】[0004]
【発明が解決しようとする課題】この限流装置は、１回
の事故に対しては有効に動作する。しかし、電力系統に
おいては、事故が発生し、事故が除去された後、すぐに
回路を再課電する場合がある。これを図９を参照して説
明する。電力系統は、送電線１５ａ、１５ｂのように２
回線並列に構成されている場合が一般的である。今、図
８の（ａ）に示すように、送電線１５ａの区間内の事故
点２１で接地事故が発生すると、限流装置１１０ａで事
故電流を制限し、遮断器１１ａ、１２ａを開放して図の
（ｂ）に示すように事故を除去する。送電線が架空送電
線である場合、一度遮断器を開放すると、事故点のアー
クが消滅し、再送電可能になることが多い。このため、
架空送電線では、事故後、１秒程度以内に、一旦開放し
た遮断器を図の（ｃ）に示すように再投入する方式、い
わゆる高速度再閉路方式を採用する場合がある。この
時、限流装置１１０ａが高いインピーダンスの状態にあ
るので、線路１１０ａに電流が流れにくく、もう一方の
線路１１０ｂで大部分の負荷電流を流す負荷電流不平衡
状態となり、本来、均等に電流を流す設備を有効に使え
ないことになる。This current limiting device operates effectively for a single accident. However, in a power system, an accident may occur, and the circuit may be immediately recharged after the accident is removed. This will be described with reference to FIG. The power system has two lines like the transmission lines 15a and 15b.
In general, the lines are configured in parallel. Now, as shown in FIG. 8A, when a grounding accident occurs at the accident point 21 in the section of the power transmission line 15a, the fault current is limited by the current limiting device 110a, and the circuit breakers 11a, 12a are opened. The accident is eliminated as shown in FIG. When the power transmission line is an overhead power transmission line, once the circuit breaker is opened, the arc at the accident point is extinguished, and the power can be retransmitted in many cases. For this reason,
In the overhead power transmission line, there is a case where a so-called high-speed reclosing method, that is, a method of reclosing the circuit breaker once opened as shown in FIG. At this time, since the current limiting device 110a is in a high impedance state, it is difficult for current to flow through the line 110a, and a load current unbalanced state in which most of the load current flows through the other line 110b is generated, and the current is originally evenly distributed. You will not be able to use the flowing equipment effectively.
【０００５】また、事故時に限流装置に加わる電圧は電
力系統の電源インピーダンスや線路インピーダンスに依
存するため、限流装置の限流速度から決定することがで
きず、このため、上記事故時に、予想以上の過大な電圧
が加わって限流装置の破壊を招くことがある。Further, since the voltage applied to the current limiting device at the time of an accident depends on the power source impedance and line impedance of the power system, it cannot be determined from the current limiting speed of the current limiting device. The excessive voltage described above may be applied to cause the breakdown of the current limiting device.
【０００６】本発明は上記した問題を解消するためにな
されたもので、電力系統の送電線事故除去後の高速再閉
路を行なった後でも、再閉路成功時には、低インピーダ
ンスで電流を流し、再閉路が失敗して事故電流が流れた
場合にも事故電流を限流することが可能な、また耐圧破
壊を防止することができる限流装置を提供することを目
的とする。The present invention has been made to solve the above-mentioned problems. Even after performing high-speed reclosing after elimination of a transmission line accident in a power system, when reclosing is successful, a current is supplied with a low impedance to An object of the present invention is to provide a current limiting device capable of limiting a fault current even when a closed circuit fails and a fault current flows, and capable of preventing breakdown by pressure.
【０００７】[0007]
【課題を解決するための手段】本発明は上記目的を達成
するために、In order to achieve the above object, the present invention provides:
【０００８】請求項１の発明では、超電導素子を有する
限流ユニットと、この限流ユニットに再閉路時に閉路さ
れるスイッチを介し並列に接続された超電導素子を有す
る高速再閉路時用の限流ユニットとを備える構成とし
た。According to the first aspect of the present invention, there is provided a current limiting unit having a superconducting element and a current limiting unit for high speed reclosing having a superconducting element connected in parallel to the current limiting unit via a switch closed at the time of reclosing. And a unit.
【０００９】請求項２の発明では、超電導素子を有する
限流ユニットと当該限流ユニットの限流動作後開路され
るスイッチの直列回路に、超電導素子を有する高速再閉
路時用の限流ユニットと再閉路時閉路され当該限流ユニ
ットの限流動作後開路されるスイッチの直列回路が並列
に接続され、この並列回路に事故電流転流用の抵抗が並
列に接続されている構成とした。According to another aspect of the present invention, there is provided a current limiting unit having a superconducting element in a series circuit of a current limiting unit having a superconducting element and a switch opened after the current limiting operation of the current limiting unit. A series circuit of switches that are closed at the time of reclosing and opened after the current limiting operation of the current limiting unit is connected in parallel, and a resistor for fault current commutation is connected in parallel to this parallel circuit.
【００１０】請求項３では、超電導素子を有する限流ユ
ニットと当該限流ユニットを回路に対して開閉するスイ
ッチを備える限流装置において、酸化亜鉛型避雷器を並
列に設けた。According to a third aspect of the present invention, a zinc oxide type arrester is provided in parallel in a current limiting device including a current limiting unit having a superconducting element and a switch for opening and closing the current limiting unit with respect to a circuit.
【００１１】[0011]
【作用】請求項１の発明では、最初の事故時は、１つの
限流ユニットが事故電流を制限し、高速再閉路時、再閉
路が成功している場合には、高速再閉路時用の限流ユニ
ットが低インピーダンスで電流を流し、再閉路が失敗し
て事故電流が流れた場合には、高速再閉路時用の限流ユ
ニットが高インピーダンスとなって、事故電流を制限す
る。According to the invention of claim 1, at the time of the first accident, one current limiting unit limits the accident current, and at the time of high-speed reclosing, and when the reclosing is successful, the one for high speed reclosing is used. When the current limiting unit passes a current with low impedance and the reclosing fails and an accident current flows, the current limiting unit for high-speed reclosing has a high impedance and limits the accident current.
【００１２】請求項２の発明では、最初の事故時は、１
つの限流ユニットが事故電流を制限し、高速再閉路時、
再閉路が成功している場合には、高速再閉路時用の限流
ユニットが低インピーダンスで電流を流し、再閉路が失
敗して事故電流が流れた場合には、高速再閉路時用の限
流ユニットが高インピーダンスとなって、事故電流を制
限する点は請求項１の発明と同じであるが、事故電流を
制限したのち、スイッチを開路することにより、制限さ
れた事故電流が抵抗へ転流し、限流ユニットの加熱が防
止され、超電導状態の回復を早めることができる。According to the invention of claim 2, 1 is set at the time of the first accident.
Two current limiting units limit the fault current and during fast reclosing,
If reclosing is successful, the current limiting unit for high speed reclosing conducts current with low impedance, and if reclosing fails and an accident current flows, the limit for high speed reclosing is limited. The current unit has a high impedance to limit the fault current, which is the same as that of the invention of claim 1, but after limiting the fault current, by opening the switch, the limited fault current is transferred to the resistance. The sink and heating of the current limiting unit are prevented, and the recovery of the superconducting state can be accelerated.
【００１３】請求項３の発明では、限流ユニットの破壊
電圧以上の電圧が加わっても、避雷器により破壊電圧以
下へ抑制することができる。According to the third aspect of the present invention, even if a voltage higher than the breakdown voltage of the current limiting unit is applied, it can be suppressed to the breakdown voltage or lower by the lightning arrester.
【００１４】[0014]
【実施例】以下、本発明の１実施例を図面を参照して説
明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
【００１５】図１において、１は交流電力系統の電源、
２は負荷、１１ａ、１１ｂ、１２ａ、１２ｂは事故電流
を遮断する遮断器、１３ａ、１３ｂ、１３ｃ、１３ｄは
電流測定用の変流器ＣＴ、１４ａ、１４ｂは限流装置の
制御装置、１５ａ、１５ｂは送電線、１６ａ、１６ｂは
図２に示す限流装置、１７、１８は限流ユニット、１
９、２０はスイツチ、２１は事故点、２２は保護リレー
である。In FIG. 1, reference numeral 1 is a power source of an AC power system,
2 is a load, 11a, 11b, 12a and 12b are circuit breakers for interrupting fault current, 13a, 13b, 13c and 13d are current transformers CT for current measurement, 14a and 14b are control devices for current limiting devices, 15a, 15b is a power transmission line, 16a and 16b are current limiting devices shown in FIG. 2, 17 and 18 are current limiting units, 1
9 and 20 are switches, 21 is an accident point, and 22 is a protection relay.
【００１６】図２において、３０、４０は電源、３１、
４１は超電導コイル、３２、４２は磁場印加コイルであ
る。In FIG. 2, reference numerals 30, 40 denote a power source, 31,
Reference numeral 41 is a superconducting coil, and 32 and 42 are magnetic field applying coils.
【００１７】次に、この実施例の動作について説明す
る。Next, the operation of this embodiment will be described.
【００１８】今、遮断器１１ａ、１１ｂ、１２ａ、１２
ｂが投入状態にあり、遮断器１１ａ−限流装置１６ａ−
送電線１５ａ−遮断器１２ａを通して、また、遮断器１
１ｂ−限流装置１６ｂ−送電線１５ｂ−遮断器１２ｂを
通して負荷２へ電力を供給しているものとする。限流装
置１６ａ、１６ｂは共に限流ユニット１７と高速再閉路
時用限流ユニット１８及びスイッチ１９、２０からな
り、スイッチ１９、２０が開路しているので、電流は限
流ユニット１７を流れている。Now, the circuit breakers 11a, 11b, 12a, 12
b is in the closed state, the circuit breaker 11a-the current limiting device 16a-
Through the transmission line 15a-the circuit breaker 12a, and also the circuit breaker 1
It is assumed that power is supplied to the load 2 through 1b-current limiting device 16b-transmission line 15b-circuit breaker 12b. Both the current limiting devices 16a and 16b are composed of a current limiting unit 17, a high speed reclosing time limiting unit 18 and switches 19 and 20. Since the switches 19 and 20 are open, the current flows through the current limiting unit 17. There is.
【００１９】この状態で、事故点２１で短絡事故が発生
すると、電源１から事故電流ＩF1が遮断器１１ａ、限流
装置１６ａを経由して事故点２１へ流れ出す。この時の
事故電流はＣＴ１３ａにより検出され、検出値が制御装
置１４ａへ入力される。制御装置１４ａは上記検出値が
設定値ＩC より大きい場合には、図２に示す電源３０か
ら磁場印加コイル３２へ電流を供給させ、磁界を発生さ
せて超電導コイル３１をクエンチさせる。これにより、
超電導コイル３１の超電導状態が失われ、超電導コイル
３１のインピーダンスが高くなり、事故電流を限流す
る。この後、ＣＴ１３ａ、ＣＴ１３ｂの検出電流により
保護リレー２２が作動し、遮断器１１ａ、１２ａが開放
され、事故区間が除去される。この限流作用により、事
故電流が制限され小さくなるので、上記遮断器に要求さ
れる遮断電流値を小さくすることができ、遮断器のコス
ト低減が可能となる。In this state, if a short circuit accident occurs at the accident point 21, the accident current I F1 flows from the power source 1 to the accident point 21 via the circuit breaker 11a and the current limiting device 16a. The fault current at this time is detected by the CT 13a, and the detected value is input to the control device 14a. When the detected value is larger than the set value I C, the controller 14a causes the power supply 30 shown in FIG. 2 to supply a current to the magnetic field applying coil 32 to generate a magnetic field to quench the superconducting coil 31. This allows
The superconducting state of the superconducting coil 31 is lost, the impedance of the superconducting coil 31 becomes high, and the fault current is limited. After that, the protection relay 22 is activated by the detection currents of the CTs 13a and CT13b, the circuit breakers 11a and 12a are opened, and the accident section is removed. Due to this current limiting action, the fault current is limited and reduced, so that the breaking current value required for the circuit breaker can be reduced, and the cost of the circuit breaker can be reduced.
【００２０】架空送電線の場合、事故除去後、図３に示
すように、保護リレー２２からの指令により１秒程度以
内に遮断器１１ａ、１２ａを再投入する高速再閉路動作
を行なう場合が多いが、本実施例では、上記保護リレー
２２からの指令を制御装置１４ａも取込み、当該制御装
置１４ａはスイッチ１９を閉路させる。この時、限流ユ
ニット１７はクエンチ状態にあるが、限流ユニット１８
は超電導状態にあるので、限流装置１６ａは電流を流
す。この高速再閉路を行なった時点で、雷電流に起因す
る閃絡アーク等の事故原因が解消されていなければ、再
度事故が発生することになる。この再度の事故電流は、
前記と同様に、ＣＴ１３ａにより検出され検出値が制御
装置１４ａへ入力される。制御装置１４ａはこの検出値
が設定値ＩC より大きい場合には、電源４０から磁場印
加コイル４２へ電流を供給させ、磁界を発生させて超電
導コイル４１をクエンチさせる。これにより、超電導コ
イル４１の超電導状態が失われ、超電導コイル４１のイ
ンピーダンスが高くなり、事故電流を限流する。この
後、ＣＴ１３ａ、ＣＴ１３ｂの検出電流により保護リレ
ー２２が作動し、遮断器１１ａ、１２ａが開放され、事
故区間が除去される。その後、スイッチ２０を投入し
て、限流ユニット１７、１８をバイパスし、超電導状態
に復帰するのを待つ。限流ユニット１７、１８が超電導
状態に復帰していない時点で線路を再課電する必要が生
じる場合には、スイッチ２０を投入状態のまま遮断器１
１ａ、１２ａを投入すればよい。線路１５ｂ側について
も同様である。In the case of an overhead power transmission line, after the accident is eliminated, as shown in FIG. 3, in many cases, a high-speed reclosing operation of reclosing the circuit breakers 11a and 12a is performed within about 1 second according to a command from the protection relay 22. However, in this embodiment, the control device 14a also takes in the command from the protection relay 22, and the control device 14a closes the switch 19. At this time, the current limiting unit 17 is in the quench state, but the current limiting unit 18 is
Is in a superconducting state, the current limiting device 16a passes a current. If the cause of the accident, such as a flash arc caused by the lightning current, is not resolved at the time when this high-speed reclosing is performed, the accident will occur again. This recurrent fault current is
Similarly to the above, the detection value detected by the CT 13a is input to the control device 14a. When the detected value is larger than the set value I C, the controller 14a causes the power supply 40 to supply a current to the magnetic field applying coil 42 to generate a magnetic field to quench the superconducting coil 41. As a result, the superconducting state of the superconducting coil 41 is lost, the impedance of the superconducting coil 41 increases, and the fault current is limited. After that, the protection relay 22 is activated by the detection currents of the CTs 13a and CT13b, the circuit breakers 11a and 12a are opened, and the accident section is removed. Then, the switch 20 is turned on to bypass the current limiting units 17 and 18 and wait for the return to the superconducting state. When it is necessary to recharge the line at a time when the current limiting units 17 and 18 have not returned to the superconducting state, the switch 20 remains closed and the circuit breaker 1 remains open.
It is sufficient to add 1a and 12a. The same applies to the line 15b side.
【００２１】上記実施例では、限流装置１６ａおよび１
６ｂ内に２台の限流ユニット１７、１８を並列に設けた
が、３台並列に設ければ、高速再閉路失敗後の再課電時
にも限流機能を発揮できる状態にすることができる。In the above embodiment, the current limiting devices 16a and 16a are provided.
Although two current limiting units 17 and 18 are provided in parallel in 6b, three current limiting units 17 and 18 can be provided in parallel so that the current limiting function can be exhibited even when power is re-applied after a high-speed reclosing failure. ..
【００２２】また、上記実施例では、２台の限流ユニッ
ト１７、１８を並列配置しているが、図４に示すよう
に、直列配置にしてもよい。In the above embodiment, the two current limiting units 17 and 18 are arranged in parallel, but they may be arranged in series as shown in FIG.
【００２３】また、スイッチ１９は限流ユニット１７の
クエンチ後ただちに投入してもよい。The switch 19 may be turned on immediately after the current limiting unit 17 is quenched.
【００２４】図５はこの発明の他の実施例を示したもの
で、スイッチ２０に代えて抵抗２３を用い、限流ユニッ
ト１７に直列に高速スイッチ２４を設けている点におい
て、図２のものと相違する。FIG. 5 shows another embodiment of the present invention, which differs from that of FIG. 2 in that a resistor 23 is used in place of the switch 20, and a high-speed switch 24 is provided in series with the current limiting unit 17. Is different from.
【００２５】本実施例では、事故点２１で短絡事故が発
生すると、図２の場合と同様に超電導コイル１７がクエ
ンチし、事故電流を限流する。この後、スイッチ２４が
開路し、事故電流を抵抗２３に転流させる。このため、
限流ユニット１７には電流が流れなくなり、限流ユニッ
ト１７の加熱時間が短くなる。この結果、再冷却して超
電導状態へ復帰する時間を短縮することができる。In the present embodiment, when a short circuit accident occurs at the accident point 21, the superconducting coil 17 is quenched and the accident current is limited as in the case of FIG. After this, the switch 24 opens, causing the fault current to commutate to the resistor 23. For this reason,
No current flows through the current limiting unit 17, and the heating time of the current limiting unit 17 is shortened. As a result, the time required for recooling and returning to the superconducting state can be shortened.
【００２６】高速再閉路動作時は、上記保護リレー２２
からの指令を受けて制御装置１４ａが図６に示すように
スイッチ１９を閉路させる。この時、スイッチ２４が開
路しているので、限流ユニット１７へは電流は流れない
が、限流ユニット１８は超電導状態にあるので、限流装
置１６ａは電流を流す。この高速再閉路を行なった時点
で、雷電流に起因する閃絡アーク等の事故原因が解消さ
れていなければ、再度事故が発生することになる。これ
により、超電導コイル４１の超電導状態が失われ、超電
導コイル４１のインピーダンスが高くなり、事故電流を
限流する。この後、スイッチ１９を開放して限流された
事故電流を抵抗２３へ転流させる。そして、ＣＴ１３
ａ、ＣＴ１３ｂの検出電流により保護リレー２２が作動
し、遮断器１１ａ、１２ａが開放され、事故区間が再度
除去される。最初の事故によってクエンチした限流ユニ
ット１７が超電導状態に復帰すればスイッチ２４を投入
する。また、限流ユニット１８が超電導状態に復帰した
時点でこの装置は初期の状態に戻る。During high-speed reclosing operation, the protection relay 22 is
In response to a command from the control device 14a, the control device 14a closes the switch 19 as shown in FIG. At this time, since the switch 24 is open, no current flows to the current limiting unit 17, but the current limiting unit 18 is in the superconducting state, so that the current limiting device 16a passes a current. If the cause of the accident, such as a flash arc caused by the lightning current, is not resolved at the time when this high-speed reclosing is performed, the accident will occur again. As a result, the superconducting state of the superconducting coil 41 is lost, the impedance of the superconducting coil 41 increases, and the fault current is limited. After that, the switch 19 is opened to commutate the limited fault current to the resistor 23. And CT13
The protection relay 22 is actuated by the current detected by a and CT13b, the circuit breakers 11a and 12a are opened, and the accident section is removed again. When the current limiting unit 17 which is quenched by the first accident returns to the superconducting state, the switch 24 is turned on. Further, when the current limiting unit 18 returns to the superconducting state, the device returns to the initial state.
【００２７】ところで、事故時に限流ユニット１７、１
８に加わる電圧はこれらの限流速度のみならず前記した
インピーダンスに依存するから、限流ユニット１７、１
８側からのみ決定することができず、前記したように、
上記事故時に、限流ユニットの破壊電圧以上の過大な電
圧が加わって破壊を招くことがある。By the way, in the event of an accident, the current limiting units 17, 1
Since the voltage applied to 8 depends not only on the current limiting speed but also on the impedance described above, the current limiting units 17, 1
It cannot be decided only from the 8 side, and as mentioned above,
At the time of the above-mentioned accident, an excessive voltage higher than the breakdown voltage of the current limiting unit may be applied to cause breakdown.
【００２８】図７はこの破壊を防止することができるよ
うにしたもので、限流ユニット２５とスイッチ２６の直
列回路を避雷器２７でバイパスし、限流ユニットに加わ
る電圧が酸化亜鉛型避雷器２７の制限電圧を超えると当
該避雷器２７が働いて限流ユニットに加わる電圧を上記
破壊電圧より低い避雷器２７の制限電圧に抑制するよう
にしてある。１１は遮断器、２８および２９はそれぞれ
上記電源インピーダンスおよび線路インピーダンスを示
している。なお、この図では、限流ユニット２５が１台
の場合を示しているが、図２および図５の２台並列の場
合にも実施して同様の効果が得られることはいうまでも
ない。FIG. 7 is designed to prevent this destruction. The series circuit of the current limiting unit 25 and the switch 26 is bypassed by the lightning arrester 27, and the voltage applied to the current limiting unit is the zinc oxide type lightning arrester 27. When the voltage exceeds the limit voltage, the lightning arrester 27 operates to suppress the voltage applied to the current limiting unit to the voltage limit of the lightning arrester 27 lower than the breakdown voltage. Reference numeral 11 is a circuit breaker, and 28 and 29 are the power source impedance and line impedance, respectively. In addition, in this figure, the case where the number of the current limiting units 25 is one is shown, but it goes without saying that the same effect can be obtained by carrying out the case where the two current limiting units 25 are arranged in parallel.
【００２９】[0029]
【発明の効果】本発明は以上説明した通り、最初の事故
時用の限流ユニットの他に、高速再閉路時用の限流ユニ
ットを設けたことにより、複数回の繰り返し事故に対し
ても確実に事故電流を制限することができ、また、制限
された事故電流を限流ユニット側から転流される抵抗を
設けたので、限流ユニットの加熱時間が短くなり、限流
ユニットの超電導状態への復帰を早めることが可能にな
る。また、避雷器を設けたことにより、限流ユニットの
耐圧破壊を防止し、信頼性を向上することができる。As described above, the present invention provides a current limiting unit for high-speed reclosing in addition to the current limiting unit for the first accident, so that it can be used for multiple repeated accidents. The fault current can be surely limited, and the resistance for commutating the limited fault current from the current limiting unit side is provided, so the heating time of the current limiting unit is shortened and the current limiting unit goes into the superconducting state. It will be possible to speed up the return of the. Further, by providing the lightning arrester, it is possible to prevent breakdown of the current limiting unit by withstand pressure and improve reliability.
【図１】本発明を実施した交流電力系統を示す図であ
る。FIG. 1 is a diagram showing an AC power system implementing the present invention.
【図２】本発明の実施例を示すブロック構成図である。FIG. 2 is a block diagram showing an embodiment of the present invention.
【図３】上記実施例の動作説明図である。FIG. 3 is an operation explanatory diagram of the above embodiment.
【図４】本発明の他の実施例のブロック図である。FIG. 4 is a block diagram of another embodiment of the present invention.
【図５】第２の発明の実施例を示すブロック図である。FIG. 5 is a block diagram showing an embodiment of the second invention.
【図６】図６の実施例の動作を説明するための図であ
る。FIG. 6 is a diagram for explaining the operation of the embodiment of FIG.
【図７】第３の発明の実施例を示すブロック図である。FIG. 7 is a block diagram showing an embodiment of the third invention.
【図８】従来の限流装置の回路図である。FIG. 8 is a circuit diagram of a conventional current limiting device.
【図９】上記従来の限流装置を備えた交流電力系統の高
速再閉路時の問題点を説明するための図である。FIG. 9 is a diagram for explaining a problem at the time of high-speed reclosing of the AC power system including the conventional current limiting device.
１ 交流系統電源 １１ａ、１１ｂ、１２ａ、１２ｂ 遮断器 １３ａ、１３ｂ、１３ｃ、１３ｃ 電流測定用ＣＴ １４ａ、１４ｂ 限流装置の制御装置 １６ａ、１６ｂ 限流装置 １７、１８、２５ 限流ユニット １９、２０、２４、２６ スイッチ ２３ 抵抗 ２７ 避雷器 ３０、４０ 限流装置の電源 ３１、４１ 超電導コイル ３２、４２ 磁場印加コイル 1 AC system power supplies 11a, 11b, 12a, 12b Circuit breakers 13a, 13b, 13c, 13c Current measuring CTs 14a, 14b Control devices for current limiting devices 16a, 16b Current limiting devices 17, 18, 25 Current limiting units 19, 20 , 24, 26 Switch 23 Resistance 27 Lightning arrester 30, 40 Power supply for current limiting device 31, 41 Superconducting coil 32, 42 Magnetic field applying coil
Claims (3)
の限流ユニットに再閉路時閉路されるスイッチを介し並
列に接続された超電導素子を有する高速再閉路時用の限
流ユニットとを備えることを特徴とする限流装置。1. A current limiting unit having a superconducting element, and a current limiting unit for high speed reclosing having a superconducting element connected in parallel to the current limiting unit via a switch which is closed during reclosing. Current limiting device characterized by.
限流ユニットの限流動作後開路されるスイッチの直列回
路に、超電導素子を有する高速再閉路時用の限流ユニッ
トと再閉路時閉路され当該限流ユニットの限流動作後開
路されるスイッチの直列回路が並列に接続され、この並
列回路に事故電流転流用の抵抗が並列に接続されている
ことを特徴とする限流装置。2. A current limiting unit having a superconducting element and a switch which is opened after the current limiting operation of the current limiting unit is connected in series to a current limiting unit for high speed reclosing and a closing circuit for reclosing. A current limiting device characterized in that a series circuit of switches opened after current limiting operation of the current limiting unit is connected in parallel, and a resistor for fault current commutation is connected in parallel to the parallel circuit.
限流ユニットを回路に対して開閉するスイッチを備える
限流装置において、酸化亜鉛型避雷器を並列に設けたこ
とを特徴とする限流装置。3. A current limiting device comprising a current limiting unit having a superconducting element and a switch for opening and closing the current limiting unit with respect to a circuit, wherein a zinc oxide type arrester is provided in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4034998A JPH05236646A (en) | 1992-02-21 | 1992-02-21 | Current limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4034998A JPH05236646A (en) | 1992-02-21 | 1992-02-21 | Current limiter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05236646A true JPH05236646A (en) | 1993-09-10 |
Family
ID=12429804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4034998A Pending JPH05236646A (en) | 1992-02-21 | 1992-02-21 | Current limiter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05236646A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100819346B1 (en) * | 2006-07-18 | 2008-04-04 | 엘에스산전 주식회사 | Electric Power Supply Stability Apparatus |
| JP2010158146A (en) * | 2008-12-31 | 2010-07-15 | Genesis Photonics Inc | Electronic device having circuit protection unit |
| JP2011078239A (en) * | 2009-09-30 | 2011-04-14 | Toshiba Corp | Superconducting current limiting system |
| JPWO2019092834A1 (en) * | 2017-11-09 | 2020-11-12 | 三菱電機株式会社 | DC cutoff device |
-
1992
- 1992-02-21 JP JP4034998A patent/JPH05236646A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100819346B1 (en) * | 2006-07-18 | 2008-04-04 | 엘에스산전 주식회사 | Electric Power Supply Stability Apparatus |
| JP2010158146A (en) * | 2008-12-31 | 2010-07-15 | Genesis Photonics Inc | Electronic device having circuit protection unit |
| JP2011078239A (en) * | 2009-09-30 | 2011-04-14 | Toshiba Corp | Superconducting current limiting system |
| JPWO2019092834A1 (en) * | 2017-11-09 | 2020-11-12 | 三菱電機株式会社 | DC cutoff device |
| US11233391B2 (en) | 2017-11-09 | 2022-01-25 | Mitsubishi Electric Corporation | DC interrupting device |
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