WO2021038978A1 - Disjoncteur à courant continu de type à commutation et son procédé - Google Patents

Disjoncteur à courant continu de type à commutation et son procédé Download PDF

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Publication number
WO2021038978A1
WO2021038978A1 PCT/JP2020/019277 JP2020019277W WO2021038978A1 WO 2021038978 A1 WO2021038978 A1 WO 2021038978A1 JP 2020019277 W JP2020019277 W JP 2020019277W WO 2021038978 A1 WO2021038978 A1 WO 2021038978A1
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WIPO (PCT)
Prior art keywords
commutation
current
circuit
switch
main
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PCT/JP2020/019277
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English (en)
Japanese (ja)
Inventor
真聡 鈴木
藤田　康信
佳彦 松田
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株式会社日立製作所
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Application filed by 株式会社日立製作所 filed Critical 株式会社日立製作所
Priority to JP2021542005A priority Critical patent/JP7147071B2/ja
Publication of WO2021038978A1 publication Critical patent/WO2021038978A1/fr

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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
    • 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

Definitions

  • the present invention relates to a commutation type DC circuit breaker which interrupts the vibration commutation current discharged from the capacitor by superimposing it on the main circuit current after opening the main switch, and a method thereof.
  • the commutation switch is turned on (ON), and the high-frequency commutation current accompanying the discharge of the capacitor is supplied to the main switch.
  • the commutation type DC circuit breaker cuts off the hard-to-cut DC by superimposing this commutation current on the main circuit current and extinguishing the arc at the current zero point generated in the main circuit current.
  • the direction in which the main circuit current flows can change.
  • the accident current at the time of an accident may be forward or reverse with respect to the current direction at the normal time.
  • the current direction is defined as follows.
  • the direction of the current flowing from the rectifier to the bus is called the positive direction, which is the normal current direction. That is, the direction in which the positive voltage output of the rectifier flows to the bus is called the positive direction.
  • the current value that can be cut off by the commutation type DC circuit breaker is smaller when the accident current is cut off in the reverse direction than when the accident current is cut off in the forward direction. Therefore, when applying to a place where the accident current cutoff in the reverse direction is required, the value of the main circuit current at the time of generating the current zero point can be reduced or the cutoff capacity can be reduced by advancing the timing of detecting the accident current in the reverse direction. It is necessary to take measures such as applying a large circuit breaker.
  • the present invention has been made to solve the above problems, and an object of the present invention is the same as in the case where the main circuit current flowing through the main switch is in the opposite direction to the normal load as in the case of the forward direction.
  • the purpose is to provide a commutation type DC circuit breaker having a breaking capacity of.
  • the present invention that solves this problem is a commutation type DC breaker that extinguishes the main switch by a commutation current that cancels the accident current and cuts off the current, and mainly connects between the DC power supply and the load.
  • a main circuit having a main switch for turning the circuit current on and off, a commutation circuit having a commutation capacitor connected in parallel to the main circuit, and a commutation circuit capable of superimposing the commutation current, and an accident current.
  • a current direction detector that detects the flow direction of the current, and a commutation direction selector switch that switches the circuit so that the first half wave of the commutation current flows in the direction that cancels the accident current according to the detection result of the current direction detection unit. It is provided with a control unit that controls the main switch so that the main switch opens when the absolute value of the accident current exceeds a predetermined value.
  • FIG. 1 is a circuit diagram of a commutation type DC circuit breaker according to a first embodiment of the present invention.
  • the commutation type DC circuit breaker 2 has a main circuit having a main switch 11 and a saturable reactor 12, an auxiliary switch 13, a non-linear resistor 14, and a commutation switch connected thereto. It is composed of 15 and a commutation circuit.
  • the main circuit includes only the main switch 11 and the saturable reactor 12 among the main switch 11, the saturable reactor 12, and the sub switch 13 connected in series between the rectifier 1 and the load (not shown).
  • the main circuit is a circuit in which the load current L is energized or cut off. Further, it may be defined as the main circuit including the non-linear resistor 14 connected in parallel to the main circuit.
  • the partner to which the commutation circuit is connected in parallel is called the main circuit.
  • the commutation capacitor 16 and the commutation direction changeover switches 17A, 17B, 18A which can connect the commutation capacitor 16 in parallel to the main switch 11 and switch the polarity so connected, It has 18B.
  • the circuit configuration for charging the commutation capacitor 16 in advance and maintaining it will be omitted from the description and other explanations of FIGS. 1 to 9.
  • the commutation direction selector switches 17A, 17B, 18A, and 18B are interlocked with each other, and the commutation direction selector switches 17A and 17B are mechanically or electrically controlled so that the on / off (ON / OFF) states match. Will be done. Similarly, the commutation direction selector switches 18A and 18B are also controlled so that the on / off (ON / OFF) states match.
  • the commutation direction changeover switches 17A and 17B are turned off (OFF), and the commutation direction changeover switches 18A and 18B are turned on (ON).
  • the control unit determines the detection result as the accident current in this state, the main switch 11 is first opened for the purpose of circuit protection. As a result, an arc is ignited between the electrodes of the main switch 11. Next, by turning on (ON) the commutation switch 15, the commutation current E in the direction indicated by the arrow and the path indicated by the broken line in FIG. 2 flows.
  • the current waveform 3 in FIG. 3 changes from Low to Hi that the commutation switch 15 is turned on (ON) when the absolute value of the accident current X indicated by the descending solid line exceeds a predetermined value. It is shown in the timing chart as a rectangle. After the commutation switch 15 is turned on (ON), the accident current X and the commutation current E are superimposed, and the current flowing through the main switch 11 in the first half wave of the commutation current E reaches the current zero point Z. .. At this current zero point Z, the arc between the electrodes is extinguished, and then no current flows through the main switch 11.
  • the damped vibration waveform shown by the broken line is a reference waveform in which the accident current and the commutation current E are superimposed, assuming that the current continues to flow even after the current zero point Z.
  • the switching timing of the commutation direction changeover switches 17A, 17B, 18A, and 18B will be described.
  • the commutation direction selector switches 17A and 17B are controlled to open and close at the same timing, and are set to ON by default.
  • the commutation direction selector switches 18A and 18B are also controlled to open and close at the same timing, and are set to OFF by default.
  • the commutation type DC circuit breaker 2 starts operating normally, and the commutation switch 15 is turned on (ON) when the absolute value of the accident current X shown in the current waveform 3 of FIG. 3 exceeds a predetermined value.
  • the current direction detecting means not shown
  • the commutation direction selector switches 17A and 17B change from Hi to Low to be controlled by a control unit (not shown) so as to be turned off from the default ON setting. It is shown in the timing chart.
  • the commutation direction changeover switches 18A and 18B are controlled by a control unit (not shown) from off (OFF) to on (ON) with a slight delay from the opening timing of the commutation direction changeover switches 17A and 17B.
  • a rectangle that changes from to Hi is shown in the timing chart.
  • the timing is set so that all of the commutation direction selector switches 17A, 17B, 18A, and 18B are not closed at the same time.
  • FIG. 4 is a circuit diagram showing a case where a positive accident current flows through the main switch 11 of the commutation type DC circuit breaker 2 of FIG.
  • the commutation direction changeover switches 17A and 17B are turned on (ON), and the commutation direction changeover switches 18A and 18B are turned on. Is turned off. Due to the connection formation of the commutation circuit shown in FIG. 4, the commutation type DC circuit breaker 2 has a current zero point at the current flowing through the main switch 11 in the first half wave of the commutation current F even when the current is interrupted in the positive direction. Can be generated.
  • the commutation switch 15 is shown to be a mechanical contact, but a semiconductor instead of the mechanical contact. Switches can also be applied. This point is the same in Examples 2 and 3 described later with reference to FIGS. 5 and 5.
  • FIG. 5 is a circuit diagram of a commutation type DC circuit breaker 2A according to a second embodiment of the present invention.
  • the commutation direction changeover switches 17A, 17B, 18A, 18B according to the first embodiment are set to IGBT (Insulated Gate Bipolar Transistor) using FIGS. 1 to 4. : Insulated gate bipolar transistor) 27A to 27D, 28A to 28D are replaced.
  • IGBT Insulated Gate Bipolar Transistor
  • the commutation direction changeover switch 17A is set to IGBT 27A-27B
  • the commutation direction changeover switch 17B is set to IGBT 27C-27D
  • the commutation direction changeover switch 18A is set to IGBT 28A-28B
  • the commutation direction changeover switch 18B is set to IGBT 28C-28D.
  • the switch control of the commutation circuit of the commutation type DC circuit breaker 2A is also controlled at the same timing as the commutation type DC circuit breaker 2 according to the first embodiment. That is, when the current in the forward direction is flowing, the IGBTs 27A to 27D are turned on (ON), the IGBTs 28A to 28D are turned off (OFF), and when the current in the opposite direction is flowing, the IGBTs 27A to 27D are turned off (OFF). OFF), and IGBTs 28A to 28D are ON.
  • the operating principle of the commutation type DC circuit breaker 2A according to the second embodiment is the same as that of the commutation type DC circuit breaker 2 according to the first embodiment. That is, those effects are such that the commutation current F in the direction determined according to the result of detecting whether the direction of the accident current X is the forward direction or the reverse direction is injected into the main circuit that opens the main switch 11. By doing so, the accident current X is canceled and the current is cut off promptly.
  • IGBTs (27A to 27D, 28A to 28D) are used as switches for switching the commutation direction, other bipolar transistors, thyristors, etc. should be used regardless of the type of semiconductor for switching. You can also.
  • FIG. 6 is a circuit diagram of a commutation type DC circuit breaker 2B according to a third embodiment of the present invention.
  • the feature of the commutation type DC circuit breaker 2B is that the commutation switch 15 provided therein is omitted as compared with the commutation type DC circuit breakers 2 and 2A according to the first and second embodiments. This is realized by having the IGBTs 27A to 27D and 28A to 28D also function as the commutation switch 15.
  • the IGBTs 27A to 27D and 28A to 28D are all turned off (OFF).
  • the IGBTs 27A to 27D are turned on (ON) after the main switch 11 is opened.
  • a current zero is generated in the current flowing through the main switch 11 in the first half wave of the commutation current, and the current is cut off.
  • the IGBTs 28A to 28D are turned on (ON) after the main switch 11 is opened.
  • a current zero is generated in the current flowing through the main switch 11 in the first half wave of the commutation current, and the current is cut off.
  • the timing at which the IGBTs 28A to 28D are turned on (ON) is the same as the timing at which the IGBTs 27A to 27D are turned on (ON) at the time of blocking in the forward direction.
  • the control unit opens the main switch 11 at any timing (not shown).
  • the commutation type DC circuit breaker (hereinafter, also simply referred to as “comparative example”) itself according to the comparative example is not shown.
  • the circuit of this comparative example is from the commutation type DC circuit breakers 2, 2A, 2B according to the first to third embodiments shown in FIGS. 1, 2, 5 and 6, and the commutation direction selector switches 17A to 18B. , 27A to 28D are eliminated and the commutation current is limited to one direction.
  • the accident current XR is brought to the current zero point Z1 by canceling the current flowing through the main switch 11 with the second half wave of the commutation current.
  • the arc between the electrodes is extinguished at the current zero point Z1, and no current flows through the main switch 11 after that.
  • the current zero point Z can be generated when the current flows in the forward direction (accident current XP), but the current when the current flows in the opposite direction (accident current XR). It may not be possible to generate the zero Z. That is, when the accident current XR in the reverse direction is cut off, it becomes more difficult to generate the current zero point Z than when the accident current XP in the forward direction is cut off.
  • FIG. 8 shows the current waveform 3 from when the accident current XR in the reverse direction starts to flow to the main switch 11 of the commutation type DC circuit breaker 2A according to the second embodiment of FIG. 5 until it is cut off, and the commutation switch 15. , It is a timing chart which shows the switching timing of the commutation direction changeover switch 27A to 28D.
  • FIG. 9 shows a current waveform 3 from when the accident current XR in the reverse direction starts to flow to the main switch 11 of the commutation type DC circuit breaker 2B according to the third embodiment of FIG. 6 until it is cut off, and a commutation direction changeover switch. It is a switching timing and a timing chart showing.
  • FIG. 9 is also a diagram for explaining the same phenomenon as that of FIG. 8, but the difference between the two is the commutation switch 15 provided in the commutation type DC circuit breaker 2A according to the second embodiment of FIG. It is based on the difference that it is omitted in the commutation type DC circuit breaker 2B according to the third embodiment of FIG. That is, the omitted commutation switch 15 function is realized by supplementing with the timing operations of the IGBTs 27A to 27D and 28A to 28D.
  • the characteristic operation of the commutation type DC circuit breaker 2B according to the third embodiment will be described with reference to FIGS. 3, 5, 6, 8 and 9. Since the commutation type DC circuit breaker 2B does not normally use a commutation circuit, the IGBTs 27A to 27D and 28A to 28D as commutation switches are all turned off (OFF) so as to disconnect the commutation circuit from the main circuit. It has become. Here, too, it is assumed that the commutation capacitor 16 is charged with a necessary and sufficient electric charge in advance and maintained until immediately before the commutation current is discharged.
  • FIG. 9 describes only when the current is cut off in the reverse direction.
  • the IGBTs 28A to 28D are turned on (ON) at the timing shown by the rectangle that changes from Low to Hi in FIG.
  • a current zero point Z is generated in the current flowing through the main switch 11 in the first half wave of the commutation current, and the current is cut off.
  • the timing at which the IGBTs 28A to 28D are turned on (ON) coincides with the timing at which the commutation switch 15 provided in the commutation type DC circuit breaker 2A of FIG. 5 is turned on (ON) (FIG. 8).
  • FIG. 9 has described only when the current is cut off in the reverse direction, when the current is cut off in the forward direction, instead of turning on (ON) the above-mentioned IGBTs 28A to 28D in FIG. 9, only the IGBTs 27A to 27D are turned on at the same timing. It may be turned on. Then, the current zero point Z shown in the current waveform 5 of FIG. 7 can be surely obtained in the first half wave of the commutation current F.
  • the commutation type DC circuit breakers 2, 2A and 2B can be summarized as follows. [1] The commutation type DC circuit breakers 2, 2A and 2B according to the first to third embodiments extinguish the main switch 11 by a commutation current that cancels the accident current X and cut off the current.
  • the commutation type DC circuit breakers 2, 2A and 2B include a main circuit, a commutation circuit, a current direction detection unit (not shown), a commutation direction changeover switch 17A to 18B, and a control unit (not shown). To be equipped.
  • the main circuit has a main switch 11 that connects between the DC power supply 1 and the load to turn on / off the main circuit current.
  • a commutation circuit having a commutation capacitor 16 is appropriately connected in parallel to the main circuit so that the commutation current can be superimposed.
  • the current direction detector detects the direction in which the accident current X flows.
  • the commutation direction changeover switches 17A to 18B switch the circuit so that the first half wave of the commutation current flows in the direction of canceling the accident current X according to the detection result of the current direction detection unit.
  • the control unit controls the main switch 11 to open when the absolute value of the accident current X exceeds a predetermined value.
  • the commutation direction selector switches 17A to 28D are before the main switch 11 is opened.
  • the timing is set to operate. Specifically, the main switch 11 is opened at a timing (not shown) after the commutation direction selector switches 17A and 18B in FIG. 3 are turned on and before the commutation switch 15 is turned on. Similarly, the main switch 11 is opened at any timing (not shown) after the commutation direction changeover switches 28A to 28D in FIG. 8 are turned on and before the commutation switch 15 is turned on.
  • the main switch 11 is opened, it is possible to flow the commutation current in the optimum direction so that the first half wave of the commutation currents E and F flows in the direction of canceling the accident current X.
  • Example 3 in the commutation type DC circuit breaker 2B according to the above [1] or [2], the commutation direction changeover switches 27A to 28D shown in FIG. 6 open the main switch 11.
  • the timing was set so that the function of the commutation switch 15 (FIGS. 1, 2, 4, 5, 8) for connecting the commutation circuit to the main circuit later was also used. Specifically, the timing at which the commutation direction switching switches 28A to 28D in FIG. 8 are turned on coincides with the timing at which the commutation switch 15 described above is turned on.
  • the main switch 11 is opened at any earlier timing (not shown). As a result, the commutation switch 15 (FIGS. 1, 2, 4, 5, 8) can be omitted, which further simplifies the process.
  • the commutation type DC cutoff method according to the embodiment of the present invention can be summarized as follows. [5] In the commutation type DC cutoff method according to Examples 1 to 3, a commutation circuit having a precharged commutation capacitor 16 is appropriately connected in parallel to the main circuit including the main switch 11 to perform commutation. By discharging the currents E and F, the arc generated in the opening portion of the main switch 11 is extinguished and the current is cut off.
  • the main circuit includes a main switch 11 that connects between the DC power supply 1 and the load to turn on / off the main circuit current.
  • the commutation capacitor 16 causes the commutation currents E and F to flow in the direction of canceling the accident current X by discharging the precharged electric charge.
  • This commutation type DC cutoff method is executed by the following procedure.
  • the commutation direction selector switches 17A to 18B are set before the absolute value of the accident current X flowing through the main circuit exceeds a predetermined value.
  • the commutation currents E and F are set to flow in the direction of canceling the accident current X according to the detection result of detecting the main circuit current, that is, the direction in which the accident current X flows.
  • the main switch 11 is opened when the absolute value of the accident current X exceeds a predetermined value. An arc is generated at the open pole.
  • the commutation capacitor 16 is connected in parallel to the main circuit. Then, the first half wave of the commutation currents E and F cancels the accident current X and cuts off the current. According to this commutation type DC circuit breaker, the same action and effect as those of the commutation type DC circuit breakers 2, 2A and 2B according to the first to third embodiments of [1] above can be obtained.
  • the present invention can be widely applied to a commutation type DC circuit breaker.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Abstract

La présente invention concerne un disjoncteur à courant continu de type à commutation (2) qui interrompt le courant en éteignant l'arc d'un commutateur principal (11) au moyen d'un courant de commutation (E) qui annule un courant de défaut (XR). Le disjoncteur à courant continu de type à commutation (2) comprend un circuit principal qui connecte une alimentation électrique à courant continu (1) et une charge et comprend un commutateur principal (11) qui allume et coupe un courant de circuit principal, un circuit de commutation qui comporte un condensateur de commutation (16), est raccordé de manière appropriée en parallèle au circuit principal, et peut superposer un courant de commutation sur le circuit principal, une unité de détection de direction de courant qui détecte la direction dans laquelle un courant de défaut (XR) circule, des commutateurs de commutation de direction de commutation (17A à 18B) qui, en fonction des résultats de détection provenant de l'unité de détection de direction de courant, commutent des circuits de telle sorte qu'une première demi-onde du courant de commutation (E) soit amenée à circuler dans une direction qui annule le courant de défaut (XR), et une unité de commande qui effectue une commande de telle sorte que le commutateur principal (11) s'ouvre lorsque la valeur absolue du courant de défaut (XR) a dépassé une valeur prescrite.
PCT/JP2020/019277 2019-08-30 2020-05-14 Disjoncteur à courant continu de type à commutation et son procédé WO2021038978A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2021542005A JP7147071B2 (ja) 2019-08-30 2020-05-14 転流式直流遮断器及びその方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019158574 2019-08-30
JP2019-158574 2019-08-30

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WO2021038978A1 true WO2021038978A1 (fr) 2021-03-04

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0628952A (ja) * 1992-07-10 1994-02-04 Mitsubishi Electric Corp 直流遮断器
JP2003346612A (ja) * 2002-05-28 2003-12-05 Mitsubishi Electric Corp 開閉装置
JP2016126920A (ja) * 2014-12-31 2016-07-11 嶋田　隆一 高電圧電流遮断器

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013214406A (ja) * 2012-04-02 2013-10-17 Fuji Electric Co Ltd 直流回路用の回路遮断スイッチ
DK2907152T3 (en) * 2012-12-19 2016-12-05 Siemens Ag Device for switching a direct current into a pole of a DC voltage network

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0628952A (ja) * 1992-07-10 1994-02-04 Mitsubishi Electric Corp 直流遮断器
JP2003346612A (ja) * 2002-05-28 2003-12-05 Mitsubishi Electric Corp 開閉装置
JP2016126920A (ja) * 2014-12-31 2016-07-11 嶋田　隆一 高電圧電流遮断器

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JPWO2021038978A1 (fr) 2021-03-04

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