JP2005190671A - Dc breaker - Google Patents

Dc breaker Download PDF

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Publication number
JP2005190671A
JP2005190671A JP2003426766A JP2003426766A JP2005190671A JP 2005190671 A JP2005190671 A JP 2005190671A JP 2003426766 A JP2003426766 A JP 2003426766A JP 2003426766 A JP2003426766 A JP 2003426766A JP 2005190671 A JP2005190671 A JP 2005190671A
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circuit breaker
circuit
current
breaker
commutation
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JP2003426766A
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JP4445252B2 (en
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Yoshimitsu Niwa
芳充 丹羽
Jun Matsuzaki
順 松崎
Kunio Yokokura
邦夫 横倉
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Toshiba Corp
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Toshiba Corp
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    • 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
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H01H9/541—Contacts shunted by semiconductor devices
    • H01H9/542—Contacts shunted by static switch means
    • H01H2009/543—Contacts shunted by static switch means third parallel branch comprising an energy absorber, e.g. MOV, PTC, Zener

Abstract

<P>PROBLEM TO BE SOLVED: To easily check a DC circuit breaker even when a DC circuit is supplied with electric power. <P>SOLUTION: The two DC circuit breakers 3 and 22 each composed by serially connecting a main circuit breaker 12 and an auxiliary circuit breaker 13 to a DC circuit and by connecting a commutation circuit 18 in parallel with each main circuit breaker 12 are connected in parallel with each other between a power line 1 of a feeder circuit for an electric railroad and a feeder wire 5; the other-side DC circuit breaker 22 is closed with one-side DC circuit breaker 3 closed to shunt a carried current of the power line 1 to the two DC circuit breakers 3 and 22; thereafter the main circuit breaker 12 of the DC circuit breaker 3 is opened to attenuate the shunted current; and when the shunted current reaches a zero point, the auxiliary circuit breaker 13 is opened. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、点検作業を容易にし得る直流回路に用いる直流遮断器に関する。   The present invention relates to a DC circuit breaker used for a DC circuit that can facilitate inspection work.

従来の電気鉄道用き電回路のような直流回路においては、直流電源の電源側に事故電流や通電電流などを遮断する直流遮断器が回線毎に設けられている（例えば、特許文献１参照。）。   In a DC circuit such as a conventional electric railway feeding circuit, a DC circuit breaker that cuts off an accident current or an energized current is provided for each line on the power source side of the DC power supply (see, for example, Patent Document 1). ).

図５に示すように、電気鉄道用き電回路の電源線１には、第１の断路器２を介して第１の直流遮断器３が接続され、この直流遮断器３から第２の断路器４を介して第１のき電線５に直流電力の供給が行われている。そして、第１のき電線５から、交通機器の電車６へ直流電力を供給し、レールなどの帰線７により負極側へ戻る回路構成となっている。また、第１のき電線５と絶縁された第２のき電線８には、電源線１から第３の断路器９を介して第２の直流遮断器１０が接続され、この第２の直流遮断器１０から第４の断路器１１を介して直流電力の供給が行われている。   As shown in FIG. 5, the first DC breaker 3 is connected to the power line 1 of the electric railway feeder circuit via the first disconnector 2, and the second disconnector is connected to the DC breaker 3. DC power is supplied to the first feeder 5 via the device 4. And it has a circuit configuration in which DC power is supplied from the first feeder 5 to the train 6 of the traffic equipment and returned to the negative electrode side by a return line 7 such as a rail. A second DC breaker 10 is connected to the second feeder 8 insulated from the first feeder 5 via the third disconnector 9 from the power line 1, and this second DC DC power is supplied from the circuit breaker 10 through the fourth disconnector 11.

この第１の直流遮断器３および第２の直流遮断器１０には、直流回路にそれぞれ主遮断器１２と副遮断器１３とが直列接続されている。主遮断器１２には、過電圧を吸収するサージアブソーバ１４、およびリアクトル１５、コンデンサ１６、転流スイッチ１７を直列接続した転流回路１８が並列接続されている。また、直流回路には、電流を検出する変流器１９が設けられている。
特開平９−７３８４５号公報 （第３ページ、図５） In the first DC breaker 3 and the second DC breaker 10, a main circuit breaker 12 and a sub circuit breaker 13 are connected in series to a DC circuit, respectively. The main circuit breaker 12 is connected in parallel with a surge absorber 14 that absorbs overvoltage, and a commutation circuit 18 in which a reactor 15, a capacitor 16, and a commutation switch 17 are connected in series. Further, the DC circuit is provided with a current transformer 19 for detecting current.
JP-A-9-73845 (3rd page, FIG. 5)

上記の従来の直流遮断器３または１０においては、次のような問題がある。   The conventional DC circuit breaker 3 or 10 has the following problems.

第１の直流遮断器３を点検する場合、第１の断路器２と第２の断路器４とを開路し、第１の直流遮断器３を直流回路から切離して点検が行われていた。また、第２の直流遮断器１０においても同様に、第３の断路器９と第４の断路器１１とを開路して直流回路から切離していた。しかしながら、この点検においては、電車６が運転されない終電から初電までの夜間に限られ、作業が困難であった。更には、電車６の運転中には、点検ができなかった。   When the first DC breaker 3 is inspected, the first disconnector 2 and the second disconnector 4 are opened, and the first DC breaker 3 is disconnected from the DC circuit. Similarly, in the second DC breaker 10, the third disconnector 9 and the fourth disconnector 11 are opened and disconnected from the DC circuit. However, in this inspection, it was limited to the night from the last train to the first train when the train 6 was not operated, and the work was difficult. Furthermore, the inspection could not be performed while the train 6 was in operation.

このため、昼間で、且つ電車６が運転中であっても直流遮断器３または１０を直流回路から切離して点検作業ができることが望まれていた。   For this reason, it has been desired that the DC circuit breaker 3 or 10 can be disconnected from the DC circuit and can be inspected in the daytime and even when the train 6 is in operation.

本発明は上記問題を解決するためになされたもので、昼間で、且つ電車が運転中であっても直流回路から切離して点検を可能とする直流遮断器を得ることを目的とする。   The present invention has been made to solve the above problems, and an object of the present invention is to provide a DC circuit breaker that can be inspected by disconnecting from a DC circuit during daytime and even when a train is in operation.

上記目的を達成するために、本発明の直流遮断器は、直流回路に主遮断器と副遮断器とを直列接続し、前記主遮断器に転流回路を並列接続した直流遮断器を電気鉄道用き電回路の電源線とき電線間に２台並列接続してなり、一方の直流遮断器を閉極した状態で他方の直流遮断器を閉極し、前記電源線の通電電流を前記２台の直流遮断器にそれぞれ分流させ、その後、前記一方の直流遮断器の主遮断器を開極し、分流された電流を減衰させ、この分流された電流が零点を迎えたとき、前記副遮断器を開極したことを特徴とする。   In order to achieve the above object, a DC circuit breaker according to the present invention includes a DC circuit breaker in which a main circuit breaker and a sub circuit breaker are connected in series to a DC circuit, and a commutation circuit is connected in parallel to the main circuit breaker. When two power supply lines of the power supply circuit are connected in parallel between the wires, one of the DC circuit breakers is closed and the other DC circuit breaker is closed. Each of the DC circuit breakers is shunted, then the main circuit breaker of the one of the DC circuit breakers is opened, the shunt current is attenuated, and when the shunt current reaches the zero point, the sub circuit breaker It is characterized by having opened the pole.

このような構成によれば、電気鉄道用き電回路に、２台の直流遮断器を並列接続し、一方の直流遮断器から他方の直流遮断器に直流電力を切替える場合、一方の直流遮断器を閉極した状態で他方の直流遮断器を閉極し、通電電流を分流させ、次いで一方の直流遮断器を開極して分流電流を零まで減衰させるので、直流電力を一方の直流遮断器から他方の直流遮断器に切替えることができる。このため、通電中の電気鉄道用き電回路から一方の直流遮断器を切離して点検することができる。   According to such a configuration, when two DC circuit breakers are connected in parallel to a feeder circuit for an electric railway and DC power is switched from one DC circuit breaker to the other DC circuit breaker, one DC circuit breaker The other DC circuit breaker is closed with the current closed, and the current flow is shunted, then one of the DC circuit breakers is opened and the shunt current is attenuated to zero. To the other DC circuit breaker. For this reason, one DC circuit breaker can be disconnected and inspected from the electric railway feeder circuit being energized.

以下、本発明による直流遮断器を図面を参照して説明する。   Hereinafter, a DC circuit breaker according to the present invention will be described with reference to the drawings.

先ず、本発明の実施例１に係る直流遮断器を図１および図２を参照して説明する。図１は、本発明の実施例１に係る直流遮断器を用いた直流回路の回路図、図２は、本発明の実施例１に係る直流遮断器および断路器の動作を説明する図である。なお、図１において、従来と同様の構成部分については、同一符号を付した。   First, a DC circuit breaker according to Embodiment 1 of the present invention will be described with reference to FIG. 1 and FIG. FIG. 1 is a circuit diagram of a DC circuit using a DC circuit breaker according to Embodiment 1 of the present invention, and FIG. 2 is a diagram for explaining operations of the DC circuit breaker and disconnector according to Embodiment 1 of the present invention. . In FIG. 1, the same components as those in the prior art are denoted by the same reference numerals.

図１に示すように、直流の電気鉄道用き電回路の電源線１には、第１の断路器２を介して第１の直流遮断器３が接続され、この直流遮断器３から第２の断路器４を介して第１のき電線５に直流電力の供給が行われている。そして、第１のき電線５から、交通機器の電車６へ電力を供給し、レールなどの帰線７により負極側へ戻る回路構成となっている。また、電源線１側に第５の断路器２０、第１のき電線５側に第６の断路器２１を接続した第３の直流遮断器２２が第１の直流遮断器３と並列接続されている。なお、第２のき電線８にも同様に、２台の直流遮断器が並列接続されている。   As shown in FIG. 1, a first DC circuit breaker 3 is connected to a power line 1 of a DC electric railway feeder circuit via a first disconnector 2, DC power is supplied to the first feeder 5 via the disconnector 4. And it is the circuit structure which supplies electric power from the 1st feeder 5 to the train 6 of a traffic device, and returns to the negative electrode side by the return line 7 such as a rail. Further, a third DC breaker 22 in which a fifth disconnector 20 is connected to the power line 1 side and a sixth disconnector 21 is connected to the first feeder 5 side is connected in parallel with the first DC breaker 3. ing. Similarly, two DC breakers are connected in parallel to the second feeder 8.

この第１の直流遮断器３および第３の直流遮断器２２には、直流回路にそれぞれ主遮断器１２と副遮断器１３とが直列接続されている。主遮断器１２には、過電圧を吸収するサージアブソーバ１４、およびリアクトル１５、コンデンサ１６、転流スイッチ１７を直列接続した転流回路１８が並列接続されている。また、それぞれの直流遮断器３、２２の直流回路には、電流を検出する変流器１９が設けられている。   A main circuit breaker 12 and a sub circuit breaker 13 are connected in series to the first DC circuit breaker 3 and the third DC circuit breaker 22, respectively, in a DC circuit. The main circuit breaker 12 is connected in parallel with a surge absorber 14 that absorbs overvoltage, and a commutation circuit 18 in which a reactor 15, a capacitor 16, and a commutation switch 17 are connected in series. Further, the DC circuit of each of the DC circuit breakers 3 and 22 is provided with a current transformer 19 for detecting current.

そして、通常、第１の断路器２、第２の断路器４が閉路され、第１の直流遮断器３も閉極されて第１のき電線５に直流電力の供給が行われている。また、第５の断路器２０、第６の断路器２１は開路、第３の直流遮断器２２は開極され、予備のものとなっている。ここで、第１の直流遮断器３を点検するために、直流電力を第３の直流遮断器２２側に切替える場合を、図２を参照して説明する。   Usually, the first disconnector 2 and the second disconnector 4 are closed, the first DC breaker 3 is also closed, and the DC power is supplied to the first feeder 5. Further, the fifth disconnector 20 and the sixth disconnector 21 are opened, and the third DC breaker 22 is opened and is a spare one. Here, a case where the DC power is switched to the third DC circuit breaker 22 side in order to check the first DC circuit breaker 3 will be described with reference to FIG.

図２に示すように、先ず、図示しない制御回路からの信号で第５の断路器２０、第６の断路器２１を時間ｔ１で閉路し、次いで、第３の直流遮断器２２の主遮断器１２および副遮断器１３を閉極する。これにより、第１の直流遮断器３側に流れていた通電電流ｉ０は、第３の直流遮断器２２側とに分流してほぼ等しい実線で示すような第１の直流遮断器３の分流電流ｉ１と、一点鎖線で示すような第３の直流遮断器２２の分流電流ｉ２となる。そして、数秒経過後の時間ｔ２において、図示しない制御回路からの信号で第１の直流遮断器３の主遮断器１２を開極すると、第１の直流遮断器３側の分流電流ｉ１は減衰し、第３の直流遮断器２２側の分流電流ｉ２は増加する。   As shown in FIG. 2, first, the fifth disconnector 20 and the sixth disconnector 21 are closed at time t <b> 1 by a signal from a control circuit (not shown), and then the main breaker of the third DC breaker 22. 12 and the auxiliary circuit breaker 13 are closed. As a result, the energization current i0 flowing to the first DC circuit breaker 3 side is shunted to the third DC circuit breaker 22 side, and the shunt current of the first DC circuit breaker 3 as shown by substantially the same solid line. i1 and the shunt current i2 of the third DC breaker 22 as indicated by the alternate long and short dash line. When the main circuit breaker 12 of the first DC circuit breaker 3 is opened with a signal from a control circuit (not shown) at time t2 after several seconds have elapsed, the shunt current i1 on the first DC circuit breaker 3 side is attenuated. The shunt current i2 on the third DC circuit breaker 22 side increases.

この分流電流ｉ１の減衰は、第１の直流遮断器３の主遮断器１２の電極間で発生するアーク抵抗などの回路定数によるものであり、数１０ｍｓ後には零点を迎える。また、第３の直流遮断器２２の分流電流ｉ２は、通電電流ｉ０まで達する。このため、分流電流ｉ１が零点を迎える時間ｔ３のとき、第１の直流遮断器３の副遮断器１３を図示しない制御回路からの信号で開極する。次いで、第１の断路器２と第２の断路器４とを開路する。   The attenuation of the shunt current i1 is due to circuit constants such as arc resistance generated between the electrodes of the main circuit breaker 12 of the first DC circuit breaker 3, and reaches a zero point after several 10 ms. Further, the shunt current i2 of the third DC circuit breaker 22 reaches the energization current i0. Therefore, at time t3 when the shunt current i1 reaches the zero point, the auxiliary circuit breaker 13 of the first DC circuit breaker 3 is opened by a signal from a control circuit (not shown). Next, the first disconnector 2 and the second disconnector 4 are opened.

これにより、直流電力を第１の直流遮断器３側から第３の直流遮断器２２側に切替えることができる。そして、第１の直流遮断器３を直流回路から切離すことができ、点検をすることができる。   Thereby, DC power can be switched from the 1st DC circuit breaker 3 side to the 3rd DC circuit breaker 22 side. And the 1st DC circuit breaker 3 can be disconnected from a DC circuit, and can be inspected.

なお、分流電流ｉ１が零になる前に第１の断路器２と第２の断路器４を開路すると、開離した電極間でアークを発生し、開路することができなくなることがある。また、転流回路１８は、動作をさせないものである。   If the first disconnector 2 and the second disconnector 4 are opened before the shunt current i1 becomes zero, an arc may be generated between the separated electrodes, and the circuit may not be opened. Further, the commutation circuit 18 does not operate.

上記実施例１の直流遮断器によれば、第１および第３の直流遮断器３および２２を並列接続し、第１の直流遮断器３から第３の直流遮断器２２に直流電力を切替える場合、第１の直流遮断器３を閉極した状態で第３の直流遮断器２２を閉極して通電電流を分流させ、その後第１の直流遮断器３を開極するので、第１の直流遮断器３の分流電流が零を迎えて、第１の直流遮断器３から第３の直流遮断器２２に直流電力を切替えることができる。そして、電気鉄道用き電線回路から第１の直流遮断器３を切離し、点検することができる。   According to the DC circuit breaker of the first embodiment, the first and third DC circuit breakers 3 and 22 are connected in parallel, and the DC power is switched from the first DC circuit breaker 3 to the third DC circuit breaker 22. Since the first DC circuit breaker 3 is closed, the third DC circuit breaker 22 is closed to divert the energizing current, and then the first DC circuit breaker 3 is opened. When the shunt current of the circuit breaker 3 reaches zero, the DC power can be switched from the first DC circuit breaker 3 to the third DC circuit breaker 22. Then, the first DC circuit breaker 3 can be disconnected from the electric railway feeder circuit and inspected.

なお、上記実施例１では、直流回路の電源側に主遮断器、そして副遮断器を直列接続して説明したが、これを逆にして、電源側に副遮断器、そして主遮断器を直列接続してもよい。   In the first embodiment, the main circuit breaker and the sub circuit breaker are connected in series on the power source side of the DC circuit, but this is reversed, and the sub circuit breaker and the main circuit breaker are connected in series on the power source side. You may connect.

次に、本発明の実施例２に係る直流遮断器を再び図１および図３を参照して説明する。図１は、本発明の実施例２に係る直流遮断器を用いた直流回路の回路図、図３は、本発明の実施例２に係る直流遮断器の動作を説明する図である。なお、この実施例２が実施例１と異なる点は、直流電力の切替え時に転流回路を動作させることである。また、図１の説明は、省略する。   Next, a DC circuit breaker according to Embodiment 2 of the present invention will be described with reference to FIGS. 1 and 3 again. FIG. 1 is a circuit diagram of a DC circuit using a DC circuit breaker according to Embodiment 2 of the present invention, and FIG. 3 is a diagram for explaining the operation of the DC circuit breaker according to Embodiment 2 of the present invention. The second embodiment is different from the first embodiment in that the commutation circuit is operated when the DC power is switched. The description of FIG. 1 is omitted.

以下、第１の直流遮断器３を点検するために、直流電力を第３の直流遮断器２２側に切替える場合を、図３を参照して説明する。   Hereinafter, a case where the DC power is switched to the third DC circuit breaker 22 side in order to check the first DC circuit breaker 3 will be described with reference to FIG.

図３に示すように、第１の直流遮断器３が閉極状態で、開極している第３の直流遮断器２２を図示しない制御回路からの信号で閉極すると、通電電流ｉ０は、分流してほぼ等しい第１の直流遮断器３の分流電流ｉ１と、第３の直流遮断器２２の分流電流ｉ２となる。次いで、時間ｔ２に図示しない制御回路からの信号で第１の直流遮断器３の主遮断器１２を開極すると、時間ｔ２から第１の直流遮断器３側の分流電流ｉ１は減衰し、第３の直流遮断器２２側の分流電流ｉ２は増加する。   As shown in FIG. 3, when the first DC breaker 3 is in a closed state and the opened third DC breaker 22 is closed by a signal from a control circuit (not shown), the energization current i0 is The shunt current i1 of the first DC circuit breaker 3 and the shunt current i2 of the third DC circuit breaker 22 are substantially equal. Next, when the main circuit breaker 12 of the first DC circuit breaker 3 is opened by a signal from a control circuit (not shown) at time t2, the shunt current i1 on the first DC circuit breaker 3 side is attenuated from time t2, and the first 3, the shunt current i2 on the DC breaker 22 side increases.

ここで、分流電流ｉ１は、第１の直流遮断器３の主遮断器１２のアーク抵抗などの回路定数により減衰して電流零点を迎える。しかしながら、その前の時間ｔ４に、図示しない制御回路からの信号で転流スイッチ１７を閉路し、分流電流ｉ１と同一方向の実線で示すような転流電流ｉ１ａを重畳させる。これは、直流回路で地絡事故などが起き、分流電流ｉ１の減衰に長時間を要する場合にも行うことができる。更には、分流電流ｉ１が増加する場合にも行うことができる。   Here, the shunt current i1 is attenuated by a circuit constant such as the arc resistance of the main circuit breaker 12 of the first DC circuit breaker 3 and reaches the current zero point. However, at the previous time t4, the commutation switch 17 is closed by a signal from a control circuit (not shown), and a commutation current i1a as indicated by a solid line in the same direction as the shunt current i1 is superimposed. This can also be performed when a ground fault or the like occurs in the DC circuit and it takes a long time to attenuate the shunt current i1. Furthermore, it can also be performed when the shunt current i1 increases.

次いで、分流電流ｉ１に重畳された転流電流ｉ１ａの半波が電流零点を迎える時間ｔ５のとき、図示しない制御回路からの信号で第１の直流遮断器３の副遮断器１３を開極する。これにより、分流電流ｉ１は、転流電流の半波の電流零点で遮断される。また、分流電流ｉ２は、第１の直流遮断器３と第３の直流遮断器１０で構成される閉回路により、転流電流ｉ１ａと反転した一点鎖線で示すような反転電流ｉ２ａが重畳され、そして分流電流ｉ１遮断時に通電電流ｉ０に達する。その後、第１の断路器２と第２の断路器４とを開路すれば、第１の直流遮断器３を直流回路から切離すことができ、点検をすることができる。   Next, when the half wave of the commutation current i1a superimposed on the shunt current i1 reaches the current zero point, the sub-breaker 13 of the first DC breaker 3 is opened by a signal from a control circuit (not shown). . Thereby, the shunt current i1 is cut off at the half-wave current zero point of the commutation current. In addition, the shunt current i2 is superimposed by a closed circuit composed of the first DC breaker 3 and the third DC breaker 10, and an inverted current i2a as shown by a dashed line reversed from the commutated current i1a is superimposed. Then, the current i0 is reached when the shunt current i1 is cut off. Thereafter, if the first disconnector 2 and the second disconnector 4 are opened, the first DC breaker 3 can be disconnected from the DC circuit and can be inspected.

なお、副遮断器１３を時間ｔ５で開極しない場合には、転流電流ｉ１ａが二点鎖線で示すような振動波電流ｉ１ｂとなって、通電電流ｉ０に加算されて電流値が増加したようになる。通電電流ｉ０が増加することは、変流器１９で地絡のような事故電流と検出され、第３の直流遮断器２２の誤動作を招くことになり好ましくない。   When the secondary circuit breaker 13 is not opened at time t5, the commutation current i1a becomes an oscillating wave current i1b as indicated by a two-dot chain line, and is added to the energization current i0 so that the current value increases. become. An increase in the energizing current i0 is not preferable because the current transformer 19 detects an accident current such as a ground fault and causes the third DC breaker 22 to malfunction.

上記実施例２の直流遮断器によれば、実施例１の効果の他に、第１の直流遮断器３を短時間で開極することができる。   According to the DC circuit breaker of the second embodiment, in addition to the effects of the first embodiment, the first DC circuit breaker 3 can be opened in a short time.

なお、上記実施例２では、主遮断器１２を開極し、その後電流零点を迎える前に副遮断器１３を開極させたが、主遮断器１２と副遮断器１３とを同時に開極させてもよい。更には、先ず副遮断器１３を開極し、次いで主遮断器１２を開極させてもよい。これは、分流電流ｉ１の減衰する時間が、第１の直流遮断器３の主遮断器１２と副遮断器１３とのアーク抵抗などの回路定数で決まるので、副遮断器１３をなるべく早く開極すればこのアーク抵抗が増加して、減衰する時間が短縮される効果を生じるためである。このため、副遮断器１３にアーク抵抗が高くなる平板電極や磁気駆動電極を用いてもよい。   In the second embodiment, the main circuit breaker 12 is opened and then the sub circuit breaker 13 is opened before reaching the current zero point. However, the main circuit breaker 12 and the sub circuit breaker 13 are opened simultaneously. May be. Furthermore, the auxiliary circuit breaker 13 may be opened first, and then the main circuit breaker 12 may be opened. This is because the time during which the shunt current i1 decays is determined by circuit constants such as arc resistance between the main circuit breaker 12 and the sub circuit breaker 13 of the first DC circuit breaker 3, so that the sub circuit breaker 13 is opened as soon as possible. This is because the arc resistance increases, and the decay time is shortened. For this reason, a flat plate electrode or a magnetic drive electrode with high arc resistance may be used for the auxiliary circuit breaker 13.

次に、本発明の実施例３に係る直流遮断器を図４を参照して説明する。図４は、本発明の実施例３に係る直流遮断器の回路構成図である。なお、この実施例３が実施例１と異なる点は、転流回路の構成である。図４において、図１と同様の構成部分については、同一符号を付した。   Next, a DC circuit breaker according to Embodiment 3 of the present invention will be described with reference to FIG. FIG. 4 is a circuit configuration diagram of a DC circuit breaker according to Embodiment 3 of the present invention. The third embodiment differs from the first embodiment in the configuration of the commutation circuit. In FIG. 4, the same components as those in FIG.

以下、直流遮断器は、第１の直流遮断器３、第３の直流遮断器２２で同様であるので、第１の直流遮断器３を例にとり説明する。   Hereinafter, since the DC breaker is the same in the first DC breaker 3 and the third DC breaker 22, the first DC breaker 3 will be described as an example.

図４に示すように、直流回路には、主遮断器１２と副遮断器１３とが直列接続されている。主遮断器１２には、過電圧を吸収するサージアブソーバ１４、およびリアクトル１５、コンデンサ１６、転流スイッチ２３を直列接続した転流回路１８が並列接続されている。ここで、転流スイッチ２３は、例えばサイリスタのようなスイッチを両方向の向きに設けたものである。また、直流回路には、電流を検出する変流器１９が設けられている。   As shown in FIG. 4, a main circuit breaker 12 and a sub circuit breaker 13 are connected in series to the DC circuit. The main circuit breaker 12 is connected in parallel with a surge absorber 14 that absorbs overvoltage, and a commutation circuit 18 in which a reactor 15, a capacitor 16, and a commutation switch 23 are connected in series. Here, the commutation switch 23 is provided with a switch such as a thyristor in both directions. Further, the DC circuit is provided with a current transformer 19 for detecting current.

これにより、主遮断器１２を開極し、次いで減衰していく分流電流に転流電流を重畳させる場合、変流器１９で分流電流を検出し、そして図示しない制御回路からの信号により転流スイッチ２３を選択して分流電流と同一方向の転流電流を重畳させる。   As a result, when the main circuit breaker 12 is opened and then the commutation current is superimposed on the shunting current that is attenuated, the shunt current is detected by the current transformer 19 and the commutation is performed by a signal from a control circuit (not shown). The switch 23 is selected to superimpose a commutation current in the same direction as the shunt current.

上記実施例３の直流遮断器によれば、実施例１の効果の他に、分流電流と同一方向の転流電流を確実に重畳させることができる。   According to the DC circuit breaker of the third embodiment, in addition to the effects of the first embodiment, a commutation current in the same direction as the shunt current can be reliably superimposed.

本発明の実施例１および実施例２に係る直流遮断器を用いた直流回路の回路図。The circuit diagram of the DC circuit using the DC circuit breaker which concerns on Example 1 and Example 2 of this invention. 本発明の実施例１に係る直流遮断器および断路器の動作を説明する図。The figure explaining operation | movement of the DC circuit breaker and disconnector which concern on Example 1 of this invention. 本発明の実施例２に係る直流遮断器の動作を説明する図。The figure explaining operation | movement of the DC circuit breaker which concerns on Example 2 of this invention. 本発明の実施例３に係る直流遮断器の回路構成図。The circuit block diagram of the direct-current circuit breaker which concerns on Example 3 of this invention. 従来の直流遮断器を用いた直流回路の回路図。The circuit diagram of the DC circuit using the conventional DC circuit breaker.

符号の説明Explanation of symbols

１ 電源線
２ 第１の断路器
３ 第１の直流遮断器
４ 第２の断路器
５ 第１のき電線
６ 電車
７ 帰線
８ 第２のき電線
９ 第３の断路器
１０ 第２の直流遮断器
１１ 第４の断路器
１２ 主遮断器
１３ 副遮断器
１４ サージアブソーバ
１５ リアクトル
１６ コンデンサ
１７、２３ 転流スイッチ
１８ 転流回路
１９ 変流器
２０ 第５の断路器
２１ 第６の断路器
２２ 第３の直流遮断器 DESCRIPTION OF SYMBOLS 1 Power line 2 1st disconnector 3 1st DC circuit breaker 4 2nd disconnector 5 1st feeder 6 Train 7 Return line 8 2nd feeder 9 3rd disconnector 10 2nd DC Circuit breaker 11 Fourth disconnector 12 Main circuit breaker 13 Sub circuit breaker 14 Surge absorber 15 Reactor 16 Capacitors 17 and 23 Commutation switch 18 Commutation circuit 19 Current transformer 20 5th disconnector 21 6th disconnector 22 Third DC circuit breaker

Claims (5)

直流回路に主遮断器と副遮断器とを直列接続し、前記主遮断器に転流回路を並列接続した直流遮断器を電気鉄道用き電回路の電源線とき電線間に２台並列接続してなり、
一方の直流遮断器を閉極した状態で他方の直流遮断器を閉極し、前記電源線の通電電流を前記２台の直流遮断器にそれぞれ分流させ、
その後、前記一方の直流遮断器の主遮断器を開極し、分流された電流を減衰させ、
この分流された電流が零点を迎えたとき、前記副遮断器を開極したことを特徴とする直流遮断器。 A DC circuit breaker with a main circuit breaker and a sub circuit breaker connected in series to a DC circuit, and two DC circuit breakers connected in parallel to the main circuit breaker are connected in parallel between the power lines and wires of the electric circuit for the electric railway. And
With one DC circuit breaker closed, the other DC circuit breaker is closed, and the energization current of the power line is divided into the two DC circuit breakers,
After that, open the main circuit breaker of the one of the DC circuit breakers, attenuate the shunt current,
A DC circuit breaker characterized in that when the divided current reaches a zero point, the secondary circuit breaker is opened. 前記主遮断器を開極し、前記分流された電流と同一方向の転流電流を前記転流回路から重畳させ、前記転流電流の半波が電流零点を迎える前に、前記副遮断器を開極したことを特徴とする請求項１に記載の直流遮断器。   Opening the main circuit breaker, superimposing a commutation current in the same direction as the shunt current from the commutation circuit, before the half wave of the commutation current reaches the current zero point, 2. The DC circuit breaker according to claim 1, wherein the circuit breaker is opened. 前記主遮断器と前記副遮断器を同時に開極したことを特徴とする請求項２に記載の直流遮断器。   The DC circuit breaker according to claim 2, wherein the main circuit breaker and the sub circuit breaker are simultaneously opened. 前記主遮断器よりも前記副遮断器を早く開極したことを特徴とする請求項２に記載の直流遮断器。   3. The DC circuit breaker according to claim 2, wherein the secondary circuit breaker is opened earlier than the main circuit breaker. 前記転流回路に、前記分流された電流と転流電流とが同一方向になるように制御できる転流スイッチを用いたことを特徴とする請求項２乃至請求項４のいずれか１項に記載の直流遮断器。   5. The commutation circuit according to claim 2, wherein a commutation switch capable of controlling the shunt current and the commutation current in the same direction is used in the commutation circuit. DC circuit breaker.
JP2003426766A 2003-12-24 2003-12-24 DC circuit breaker control method Expired - Fee Related JP4445252B2 (en)

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