CN113991619A - Current transfer circuit and current transfer device for direct current circuit breaker - Google Patents
Current transfer circuit and current transfer device for direct current circuit breaker Download PDFInfo
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- CN113991619A CN113991619A CN202111188484.3A CN202111188484A CN113991619A CN 113991619 A CN113991619 A CN 113991619A CN 202111188484 A CN202111188484 A CN 202111188484A CN 113991619 A CN113991619 A CN 113991619A
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- 238000010521 absorption reaction Methods 0.000 claims abstract description 42
- 238000005265 energy consumption Methods 0.000 claims abstract description 34
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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Abstract
The invention relates to a current transfer circuit and a current transfer device for a direct current circuit breaker, wherein the current transfer circuit comprises a first transfer branch circuit, the first transfer branch circuit comprises a first controllable switch tube and an absorption capacitor, and the first controllable switch tube is connected with the absorption capacitor in parallel; the second transfer branch comprises a second controllable switch tube and a back-pressure transfer capacitor, the second controllable switch tube is connected with the back-pressure transfer capacitor in series, two ends of the back-pressure transfer capacitor are connected with a charging circuit, and the charging circuit is used for providing a back voltage to the back-pressure transfer capacitor when the second controllable switch tube is conducted; the energy consumption branch circuit is connected with the first transfer branch circuit and the second transfer branch circuit in parallel so as to consume electric quantity at two ends of the absorption capacitor or the back-pressure transfer capacitor; the controller controls the first controllable switch tube to be conducted when the current in the main circuit is smaller than a set value, and controls the second controllable switch tube to be conducted when the current in the main circuit is larger than or equal to the set value. The invention utilizes two transfer branches to transfer the main circuit current efficiently.
Description
Technical Field
The invention relates to a current transfer circuit and a current transfer device for a direct current breaker, and belongs to the technical field of breaking of direct current breakers.
Background
The direct-current circuit breaker is used as core equipment in the field of medium-voltage direct-current power distribution, is used for bearing rated through current and is also used for switching on and off short-circuit current. The short-circuit current is usually much larger than the rated current of the system, and in order to ensure the safe operation of the user equipment, the fault direct current of the main circuit needs to be disconnected. Because the direct current has no natural zero crossing point, especially the short-circuit direct current has large amplitude, a special means is needed to realize the disconnection of the fault direct current.
The existing direct current breaking technology can adopt a means of forcing zero crossing to enable the arc current between fractures of the vacuum circuit breaker to zero, and the technology has the defects that particularly when short-circuit current is broken, the cost of switch equipment is high, the automation degree is low, the number of control points is large, the reliability of rapid switching is low, the short-circuit arc current is very large, the arcing time between the fractures is easy to overlong, important current-carrying parts such as contacts are burnt, and further serious power accidents are caused.
In addition, a current transfer mode is mature in the existing direct current breaking technology, for example, the invention patent with the publication number of CN108462486B discloses a high-voltage direct current circuit breaker with a transfer branch and an energy consumption branch, wherein the transfer branch and the energy consumption branch are respectively connected in parallel with a fast switch in a main circuit, an absorption capacitor is connected in series in the transfer branch, and a plurality of lightning arresters are connected in series in the energy consumption branch. When the current needs to be cut off, the IGBT in the electronic switch is turned off only by turning off the IGBT, the IGBT is turned on and then is turned off quickly, when the IGBT is turned off from the on state, the current in the main circuit is transferred to the transfer branch circuit, and then the absorption capacitor in the transfer branch circuit is charged, and when the voltage of the absorption capacitor exceeds the protection voltage of the energy consumption unit, the current is transferred to the energy consumption electric branch circuit, and the energy is consumed by the energy consumption branch circuit. In the process, when the current in the main circuit is completely transferred and the current between the fractures of the fast switch passes zero, the fast switch acts to realize the turn-off.
According to the high-voltage direct-current circuit breaker with the transfer branch and the energy consumption branch, when a main circuit with large current needs to be switched off, the number of diode units which need to be connected in series in each branch and the number of corresponding full-control switches need to be determined according to the voltage grade of the direct-current circuit breaker and the magnitude of the cut-off current. This way of changing the ability to switch off the current by selecting a different number of components does not allow for efficient current switching off.
Disclosure of Invention
The invention aims to provide a current transfer circuit for a direct current breaker, which is used for solving the technical problem that the current can not be efficiently turned off in the prior art. The invention also aims to provide a current transfer device with the current transfer circuit.
The invention adopts the following technical scheme:
a current diversion circuit for a dc circuit breaker, comprising:
the first terminal and the second terminal are respectively connected to two ends of the fast switch in the main circuit;
the first transfer branch circuit is connected between the first terminal and the second terminal in series and comprises a first controllable switching tube, an absorption capacitor and a current-limiting resistor, the first controllable switching tube is connected with the absorption capacitor in parallel, and the current-limiting resistor is connected with the absorption capacitor in series;
the second transfer branch circuit is connected with the first transfer branch circuit in parallel and comprises a second controllable switch tube and a back-pressure transfer capacitor, the second controllable switch tube is connected with the back-pressure transfer capacitor in series, two ends of the back-pressure transfer capacitor are connected with charging circuits, and the charging circuits are used for providing a back voltage for the front-pressure transfer capacitor when the second controllable switch tube is conducted;
the energy consumption branch circuit is connected with the first transfer branch circuit and the second transfer branch circuit in parallel and comprises an energy consumption device, and the energy consumption branch circuit discharges when the voltage at the two ends of the absorption capacitor or the back-pressure transfer capacitor reaches the conduction value of the energy consumption device so as to consume the electric quantity at the two ends of the absorption capacitor or the back-pressure transfer capacitor;
and the controller controls the first controllable switching tube to be conducted when the current in the main circuit is less than a set value, and controls the second controllable switching tube to be conducted when the current in the main circuit is greater than or equal to the set value.
The beneficial technical effects are that: according to the current transfer circuit, two transfer branches used for transferring different currents are arranged in parallel, the smaller current in the main circuit is directly transferred through the first transfer branch, the larger current is transferred through the back-pressure transfer capacitor in the second transfer branch, the first controllable switch tube is controlled to be conducted through the controller when the current is smaller than a set value, the current is transferred to the first transfer branch, the second transfer branch is controlled to be conducted when the current is larger than or equal to the set value, the current in the main circuit can be transferred efficiently according to the current magnitude, and when the current flowing through the quick switch in the main circuit crosses zero, the quick switch is completely opened, so that the direct current is turned off.
Further, in order to realize that the current transfer circuit can be connected into the main circuit in both the forward direction and the reverse direction, the first diode component and the second diode component are arranged between the first wiring end and the second wiring end, the first diode component comprises a first diode component and a second diode component, the second diode component comprises a third diode component and a fourth diode component, the directions of the diode components in the same group are the same, the directions of the two diode components are opposite, the anode of the first diode component is connected with the first wiring end, the cathode of the first diode component is connected with the anode of the second diode component through the first controllable switch tube, the cathode of the second diode component is connected with the second wiring end, the anode of the third diode component is connected with the second wiring end, the cathode of the third diode component is connected with the fourth diode component through the first controllable switch tube, and the cathode of the fourth diode component is connected with the first wiring end.
Furthermore, in order to enable the voltage at the two ends of the absorption capacitor to be completely consumed, the first transfer branch is provided with a backward diode, the backward diode is reversely connected with the first controllable switch tube in parallel, and the backward diode is connected with the current-limiting resistor and the absorption capacitor in parallel.
Further, the energy dissipation device comprises an energy dissipation lightning arrester connected with the absorption capacitor and the current limiting resistor in parallel.
Further, in order to ensure that the voltage-sharing effect is achieved, the energy consumption device comprises a voltage-sharing resistor connected with the energy consumption lightning arrester in parallel.
Further, in order to completely release the electric quantity at the two ends of the back-pressure transfer capacitor, the back-pressure transfer capacitor is connected with a discharge resistor through a discharge switch, so that a discharge loop is formed after the second controllable switch tube is disconnected.
Furthermore, in order to conveniently charge the back-voltage transfer capacitor, a charging power supply is arranged in the charging circuit, and the charging power supply is connected with the back-voltage transfer capacitor through a charging switch so as to provide a back voltage for the back-voltage transfer capacitor.
The utility model provides a direct current is current transfer device for circuit breaker, includes the dolly, installs the current transfer module on the dolly, and the current transfer module includes current transfer circuit, and current transfer circuit includes:
the first terminal and the second terminal are respectively connected to two ends of the fast switch in the main circuit;
the first transfer branch circuit is connected between the first terminal and the second terminal in series and comprises a first controllable switching tube, an absorption capacitor and a current-limiting resistor, the first controllable switching tube is connected with the absorption capacitor in parallel, and the current-limiting resistor is connected with the absorption capacitor in series;
the second transfer branch circuit is connected with the first transfer branch circuit in parallel and comprises a second controllable switch tube and a back-pressure transfer capacitor, the second controllable switch tube is connected with the back-pressure transfer capacitor in series, two ends of the back-pressure transfer capacitor are connected with charging circuits, and the charging circuits are used for providing a back voltage for the front-pressure transfer capacitor when the second controllable switch tube is conducted;
the energy consumption branch circuit is connected with the first transfer branch circuit and the second transfer branch circuit in parallel and comprises an energy consumption device, and the energy consumption branch circuit discharges when the voltage at the two ends of the absorption capacitor or the back-pressure transfer capacitor reaches the conduction value of the energy consumption device so as to consume the electric quantity at the two ends of the absorption capacitor or the back-pressure transfer capacitor;
and the controller controls the first controllable switching tube to be conducted when the current in the main circuit is less than a set value, and controls the second controllable switching tube to be conducted when the current in the main circuit is greater than or equal to the set value.
The beneficial technical effects are that: according to the current transfer circuit, two transfer branches used for transferring different currents are arranged in parallel, the smaller current in the main circuit is directly transferred through the first transfer branch, the larger current is transferred through the back-pressure transfer capacitor in the second transfer branch, the first controllable switch tube is controlled to be conducted through the controller when the current is smaller than a set value, the current is transferred to the first transfer branch, the second transfer branch is controlled to be conducted when the current is larger than or equal to the set value, the current in the main circuit can be transferred efficiently according to the current magnitude, and when the current flowing through the quick switch in the main circuit crosses zero, the quick switch is completely opened, so that the direct current is turned off.
Further, in order to realize that the current transfer circuit can be connected into the main circuit in both the forward direction and the reverse direction, the first diode component and the second diode component are arranged between the first wiring end and the second wiring end, the first diode component comprises a first diode component and a second diode component, the second diode component comprises a third diode component and a fourth diode component, the directions of the diode components in the same group are the same, the directions of the two diode components are opposite, the anode of the first diode component is connected with the first wiring end, the cathode of the first diode component is connected with the anode of the second diode component through the first controllable switch tube, the cathode of the second diode component is connected with the second wiring end, the anode of the third diode component is connected with the second wiring end, the cathode of the third diode component is connected with the fourth diode component through the first controllable switch tube, and the cathode of the fourth diode component is connected with the first wiring end.
Furthermore, in order to enable the voltage at the two ends of the absorption capacitor to be completely consumed, the first transfer branch is provided with a backward diode, the backward diode is reversely connected with the first controllable switch tube in parallel, and the backward diode is connected with the current-limiting resistor and the absorption capacitor in parallel.
Further, the energy dissipation device comprises an energy dissipation lightning arrester connected with the absorption capacitor and the current limiting resistor in parallel.
Further, in order to ensure that the voltage-sharing effect is achieved, the energy consumption device comprises a voltage-sharing resistor connected with the energy consumption lightning arrester in parallel.
Further, in order to completely release the electric quantity at the two ends of the back-pressure transfer capacitor, the back-pressure transfer capacitor is connected with a discharge resistor through a discharge switch, so that a discharge loop is formed after the second controllable switch tube is disconnected.
Furthermore, in order to conveniently charge the back-voltage transfer capacitor, a charging power supply is arranged in the charging circuit, and the charging power supply is connected with the back-voltage transfer capacitor through a charging switch so as to provide a back voltage for the back-voltage transfer capacitor.
Furthermore, in order to realize that each electrical component is integrally installed on the trolley, a first support, a power electronic device and a second support are installed on the trolley through insulators, the first support, the power electronic device and the second support are sequentially arranged at intervals, a first high-voltage vacuum contactor and a second high-voltage vacuum contactor are fixed to the top of the first support, a first high-voltage discharge contactor is connected with a first contact wiring row, the second high-voltage vacuum contactor is connected with a second contact wiring row, the first contact wiring row forms a first wiring end, the second contact wiring row forms a second wiring end, a second transfer branch is installed on the second support, the power electronic device comprises an outer frame, and a first transfer branch and an energy consumption branch are arranged in the outer frame.
Further, the first group of diode assemblies and the second group of diode assemblies are fixed on the top of the outer frame in a side-by-side spaced mode.
Drawings
Fig. 1 is a schematic diagram of an embodiment 1 of a current transfer circuit for a dc circuit breaker according to the present invention;
fig. 2 is a schematic view of an overall structure of a current transfer device 1 according to an embodiment of the present invention;
fig. 3 is another schematic overall structure diagram of the current transfer device of the embodiment 1 for a dc circuit breaker according to the present invention;
in the figure: 1. a trolley base; 2. an insulator; 3. a first bracket; 4. a first high voltage vacuum contactor; 5 a second high voltage vacuum contactor; 6. a second diode assembly; 7. a third diode assembly; 8. a first diode component; 9. a fourth diode assembly; 10. a power electronics device; 11. a second thyristor assembly; 12. a charging resistor; 13. a controller; 14. a rectifier diode; 15. a high voltage discharge contactor; 16. a high voltage live display; 17. a back-voltage transfer capacitance; 18. a second bracket; 19. a discharge resistor; 20. a positive terminal; 21. a negative terminal; 22. an upper contact terminal row; 23. a lower contact terminal row; 24. an insulating fixing plate; 101. a power device anode; 102. a power device cathode; 103. a power electronic device; 104. a reverse diode; 107. an energy-consuming arrester; 108. an absorption capacitance; 109. a current limiting resistor; 110. a voltage-sharing resistor; 111. soft connection; 112. a crank is connected.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
The specific embodiment 1 of the current transfer device for a dc circuit breaker of the present invention: as shown in fig. 1-3, the current diverting device comprises a current diverting circuit, as shown in fig. 1, which comprises a first terminal and a second terminal, i.e. a and B in fig. 1, which are connected, in use, to both ends of the fast switch in the main circuit, respectively, so that the whole current diverting circuit is connected in parallel with the fast switch.
A first transfer branch is connected between the first terminal and the second terminal in series, the first transfer branch comprises a first controllable switch tube T1 and an absorption capacitor CS, and the first controllable switch tube T1 is connected with the absorption capacitor CS in parallel. The first transfer branch is connected in parallel with a second transfer branch, the second transfer branch comprises a second controllable switch tube T2 and a back-pressure transfer capacitor C, the second controllable switch tube T2 is connected in series with the back-pressure transfer capacitor C, a charging circuit is connected to two ends of the back-pressure transfer capacitor C, the charging circuit is used for providing a reverse voltage to the back-pressure transfer capacitor C before the second controllable switch tube T2 is turned on, and the reverse direction refers to the direction opposite to the voltage in the main circuit.
The first controllable switch tube and the second controllable switch tube are both thyristor components, wherein the conduction capability of the first controllable switch tube is weaker than that of the second controllable switch tube. The first controllable switch tube T1 and the second controllable switch tube T2 are in control connection with a controller, the controller controls the first controllable switch tube T1 to be conducted when the current in the main circuit is smaller than a set value, and controls the second controllable switch tube T2 to be conducted when the current in the main circuit is larger than or equal to the set value; in this embodiment, the set value is 4000A. When the first controllable switch T1 is turned from on to off, the current in the main circuit is drawn into the first transfer branch and charges the absorption capacitor CS. When the second controllable switch transistor T2 is turned on, since the voltage direction in the back-voltage transfer capacitor C is opposite to the voltage direction in the main circuit, the current in the main circuit is more easily absorbed into the second transfer branch, the transfer current transferred into the second transfer branch first fills up the original reverse voltage of the back-voltage transfer capacitor, and then charges the back-voltage transfer capacitor.
The current transfer circuit further comprises an energy consumption branch, and energy consumption devices are arranged in the energy consumption branch. When the voltage value at the two ends of the absorption capacitor CS or the back-pressure transfer capacitor C reaches the conduction value of the energy consumption device, the absorption capacitor discharges to the energy consumption branch circuit, the energy consumption device consumes the transfer current in the current transfer circuit, and when the current flowing through the fracture of the fast switch crosses zero, the fast switch is opened to complete the turning off of the current in the main circuit.
And after the quick switch in the main circuit is turned off, the residual electric quantity in the absorption capacitor CS passes through a discharge loop formed by the current limiting resistor RS and the reverse diode D5, and the electric quantities at two ends of the absorption capacitor CS are quickly consumed. The second transfer branch is internally provided with a discharge resistor R1 and a discharge switch K3 which are connected with the back-pressure transfer capacitor in parallel, the fast switch in the main circuit closes the opening, and the residual electric quantity at the two ends of the back-pressure transfer capacitor is consumed by the discharge resistor.
In this embodiment, be equipped with charging source in the charging circuit for the back pressure shifts electric capacity charges, charging source is constant voltage power supply TM, and charging source passes through charging switch K4, charging resistor R2 and rectifier diode D6 and is connected with the back pressure shifts electric capacity, utilizes charging source more conveniently to charge, and rectifier diode can prevent that the electric current is palirrhea simultaneously.
In this embodiment, a first diode assembly and a second diode assembly are disposed between the first terminal and the second terminal, the first diode assembly includes a first diode assembly D1 and a second diode assembly D4, the second diode assembly includes a third diode assembly D2 and a fourth diode assembly D3, the diode assemblies in the same group are in the same direction, the diode assemblies in the two groups are in opposite directions, the anode of the first diode assembly D1 is connected to the first terminal, the cathode of the first diode assembly D1 is connected to the anode of the second diode assembly D4 via a first controllable switch T1, the cathode of the second diode assembly D4 is connected to the second terminal, the anode of the third diode assembly D2 is connected to the second terminal, the cathode of the third diode assembly D2 is connected to the fourth diode assembly D3 via a first controllable switch, and the cathode of the fourth diode assembly D3 is connected to the first terminal. Through setting up two sets of diode subassemblies, can realize that whole current transfer return circuit can reach forward access and can reverse access, can adapt to different fast switch, improve the adaptability. A first high-voltage vacuum contactor K1 is connected in series between the first terminal and the first diode component, and a second high-voltage vacuum contactor K2 is connected in series between the second terminal and the second diode component.
The specific structure of the current transfer device according to the present invention is described below with reference to the above current transfer circuit, as shown in fig. 2 and 3, the current transfer device includes a movable cart 1, and further includes an insulator 2, a first support 3, a power electronic device 10, and a second support 18, the first support 3, the power electronic device 10, and the second support 18 are mounted on a base of the cart 1 through the insulator 3 in an insulating manner, the first support 3, the power electronic device 10, and the second support 18 are sequentially arranged at intervals in a left-right direction, and the first support 3 and the second support 18 are respectively located on opposite sides of the power electronic device 10. The power electronic device comprises an outer frame, and an absorption capacitor 108, a current limiting resistor 109, a voltage equalizing resistor 110 and an energy consumption lightning arrester 107 in the first transfer branch and the energy consumption branch are respectively arranged in the outer frame.
The current transfer device further comprises an upper contact wiring row 22, a lower contact wiring row 23, a first high-voltage vacuum contactor 4 and a second high-voltage vacuum contactor 5, wherein the first high-voltage vacuum contactor 4 and the second high-voltage vacuum contactor 5 are fixed at the top end of the first support 3 at intervals in the front-back direction, one end of the upper contact wiring row 22 is connected with the first high-voltage vacuum contactor 4, and the other end of the upper contact wiring row is used for being connected with an upper contact of a quick switch in a main circuit; one end of the lower contact terminal row 23 is connected with the second high-voltage vacuum contact 5, the other end is used for connecting with a lower contact of a quick switch in the main circuit, and the upper contact terminal row 22 and the lower contact terminal row 23 respectively form a first terminal and a second terminal in the current transfer circuit.
The first high-voltage vacuum contactor 4 is connected with the first diode component 8 and the fourth diode component 9 through a busbar, and the second high-voltage vacuum contactor 5 is connected with the second diode component 6 and the third diode component 7 through a busbar. Wherein the first diode assembly 8 and the second diode assembly 6 form a first group of diode assemblies, the third diode assembly 7 and the fourth diode assembly 9 form a second group of diode assemblies, and the two groups of diode assemblies are fixed on the top of the outer frame of the power electrical device 10 at intervals side by side. The third diode assembly 7 and the fourth diode assembly 9 are connected to the positive terminal 20 of the power electronic device 10 through a busbar; the second diode assembly 6 and the first diode assembly 8 are connected to a negative terminal 21 of the power electronic device 10 through a busbar; an insulating fixing plate 24 on top of the outer frame is used to support the busbar.
In the present invention, the second controllable switch tube is a second thyristor assembly 11, the first controllable switch tube is a first thyristor assembly (not shown in the figure), one end of the second thyristor assembly 11 is connected to a back-pressure transfer capacitor 17 through a bus bar, the other end is connected to a negative terminal 21 of the power electronic device through the bus bar, the other end of the back-pressure transfer capacitor 17 is connected to a positive terminal 20 of the power electronic device through the bus bar, the back-pressure transfer capacitor 17 is connected in parallel to a discharge resistor 19 through a high-voltage discharge contactor 15, the high-voltage discharge contactor 15 is a discharge switch K3, and a discharge loop of the back-pressure transfer capacitor 17 is composed of the high-voltage discharge contactor 15 and the discharge resistor 19.
The back pressure transfer capacitor 17 is supported by the insulator 2 and the second bracket 18, and the high-voltage live display 16 is used for displaying the live state of the back pressure transfer capacitor 17. The controller 13 performs the automatic control logic processing of the whole current transfer device, and the controller 13 is fixed on the top of the second bracket 18. The charging of the back-voltage transfer capacitor 17 of the current transfer device is provided by a charging circuit. The charging resistor 12 and the rectifying diode 14 in the charging circuit are arranged on top of the second leg 18.
The power electronics device 10 comprises a power electronics device 103, the electronics device anode 101 being connected to the power electronics device anode terminal 20 and the power electronics device cathode 102 being connected to the power electronics device cathode terminal 21. In this embodiment, the two ends of the power electronic device 103 are connected in parallel with the reverse diode 104 in an inverse manner through the busbar, the absorption capacitor 108 is connected in parallel through the flexible connection 111 and the current limiting resistor 109, and meanwhile, the two ends of the power electronic device 103 are connected in parallel with the voltage equalizing resistor 110 and the dissipative arrester MOV107 through the busbar. In addition, the power electronics device is provided with a driving power supply, a driving contactor, and a connecting crank 112, wherein the driving power supply is used for driving the first thyristor assembly and the second thyristor assembly, and the connecting crank 112 is used for supporting the backward diode 104.
When the current transfer device is used, when the direct current less than 4000A is cut off, the controller 13 conducts the first thyristor assembly, and the direct current in the main circuit flows through the first high-voltage vacuum contactor 4, the first diode assembly 8, the power electronic device 10, the second diode assembly 6 and the second high-voltage vacuum contactor 5 to the main circuit under the action of the fast switching high-arc voltage; when all the current of the main circuit is transferred to a current transfer circuit in the current transfer device and a quick switch in the main circuit is completely opened, the controller 13 controls the power electronic device 103 of the power electronic device 10 to be disconnected, the transfer current charges the absorption capacitor 108, when the voltage at two ends of the absorption capacitor 108 is greater than the conduction voltage of the dissipation arrester MOV107, the transfer current is consumed through the dissipation arrester MOV107, and the completion of the disconnection is less than 4000A direct current. Meanwhile, the residual voltage across the absorption capacitor 108 in the power electronic device 10 is rapidly consumed by the current limiting resistor 109.
When the direct current of more than or equal to 4000A is switched on, the controller 13 controls the second thyristor component 11 to be conducted, meanwhile, under the action of the back pressure transfer capacitor 17, the direct current of the main circuit is transferred from the first high-voltage vacuum contactor 4, the first diode component 8, the back pressure transfer capacitor 17, the second thyristor component 11, the second diode component 6 and the second high-voltage vacuum contactor 5 to the main circuit, meanwhile, the back pressure transfer capacitor 17 is charged by the transferred current, when the voltage at two ends of the back pressure transfer capacitor 17 is more than the conducting voltage of the MOV107 of the energy dissipation arrester, the transferred current is consumed through a loop of the energy dissipation arrester 107, meanwhile, a quick switch of the main circuit is completely opened, and the direct current of more than 4000A is switched on and switched off.
As another embodiment of the present invention, different from embodiment 1, there is: only the first set of diode assemblies may be provided, or only the second set of diode assemblies may be provided.
As another embodiment of the present invention, different from embodiment 1, there is: the back-pressure transfer capacitor may not have a discharge resistor connected across it.
As another embodiment of the present invention, different from embodiment 1, there is: the absorption capacitor and the current limiting resistor may not be connected in parallel with the inverse diode.
As another embodiment of the present invention, different from embodiment 1, there is: the charging circuit may not include a charging resistor and a rectifying diode.
As another embodiment of the present invention, different from embodiment 1, there is: the voltage equalizing resistor may not be provided.
The current transfer circuit of the embodiment of the current transfer circuit for the direct current circuit breaker is the same as that of the embodiment of the current transfer device, and the description is omitted.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.
Claims (10)
1. A current transfer circuit for a DC circuit breaker, comprising:
the first terminal and the second terminal are respectively connected to two ends of the fast switch in the main circuit; the first transfer branch circuit is connected between the first terminal and the second terminal in series and comprises a first controllable switching tube, an absorption capacitor and a current-limiting resistor, the first controllable switching tube is connected with the absorption capacitor in parallel, and the current-limiting resistor is connected with the absorption capacitor in series;
the second transfer branch circuit is connected with the first transfer branch circuit in parallel and comprises a second controllable switch tube and a back-pressure transfer capacitor, the second controllable switch tube is connected with the back-pressure transfer capacitor in series, two ends of the back-pressure transfer capacitor are connected with charging circuits, and the charging circuits are used for providing a back voltage for the front-pressure transfer capacitor when the second controllable switch tube is conducted;
the energy consumption branch circuit is connected with the first transfer branch circuit and the second transfer branch circuit in parallel and comprises an energy consumption device, and the energy consumption branch circuit discharges when the voltage at the two ends of the absorption capacitor or the back-pressure transfer capacitor reaches the conduction value of the energy consumption device so as to consume the electric quantity at the two ends of the absorption capacitor or the back-pressure transfer capacitor;
and the controller controls the first controllable switching tube to be conducted when the current in the main circuit is less than a set value, and controls the second controllable switching tube to be conducted when the current in the main circuit is greater than or equal to the set value.
2. The current transfer circuit for a dc circuit breaker according to claim 1, wherein a first diode assembly and a second diode assembly are disposed between the first terminal and the second terminal, the first diode assembly comprises a first diode assembly and a second diode assembly, the second diode assembly comprises a third diode assembly and a fourth diode assembly, the diode assemblies of the same group are in the same direction, the diode assemblies of the two groups are in opposite directions, the anode of the first diode assembly is connected to the first terminal, the cathode of the first diode assembly is connected to the anode of the second diode assembly through the first controllable switch, the cathode of the second diode assembly is connected to the second terminal, the anode of the third diode assembly is connected to the second terminal, the cathode of the third diode assembly is connected to the fourth diode assembly through the first controllable switch, and the cathode of the fourth diode assembly is connected to the first terminal.
3. The current transfer circuit for a dc circuit breaker according to claim 1 or 2, characterized in that the first transfer branch is provided with a backward diode, which is connected in anti-parallel with the first controllable switching tube and which is connected in parallel with the current limiting resistor and the absorption capacitor.
4. The current transfer circuit for a dc circuit breaker according to claim 1 or 2, wherein said dissipative device comprises a dissipative lightning arrester connected in parallel with a snubber capacitor and a current limiting resistor.
5. The current transfer circuit for a dc circuit breaker according to claim 4, wherein said energy consuming device comprises a grading resistor in parallel with an energy consuming arrester.
6. The current transfer circuit for the dc circuit breaker according to claim 1 or 2, wherein the back voltage transfer capacitor is connected with a discharge resistor through a discharge switch to form a discharge loop after the second controllable switch tube is disconnected.
7. The current transfer circuit for the dc circuit breaker according to claim 1 or 2, wherein a charging power source is provided in the charging circuit, and the charging power source is connected to the back-voltage transfer capacitor through a charging switch to supply a back-voltage to the back-voltage transfer capacitor.
8. A current transfer arrangement for a dc circuit breaker, comprising a trolley on which is mounted a current transfer module comprising a current transfer circuit as claimed in any one of claims 1 to 7.
9. The current transfer device for the direct current circuit breaker according to claim 8, wherein the trolley is provided with a first bracket, a power electronic device and a second bracket through insulators, the first bracket, the power electronic device and the second bracket are sequentially arranged at intervals, a first high voltage vacuum contactor and a second high voltage vacuum contactor are fixed on the top of the first bracket, the first high voltage vacuum contactor is connected with a first contact wiring row, the second high voltage vacuum contactor is connected with a second contact wiring row, the first contact wiring row forms a first wiring end, the second contact wiring row forms a second wiring end, the second transfer branch is mounted on the second bracket, the power electronic device comprises an outer frame, and the first transfer branch and the energy consumption branch are arranged in the outer frame.
10. The current diverting device for a dc circuit breaker according to claim 9, wherein the first and second sets of diode assemblies are secured side-by-side and spaced apart on top of the outer frame.
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