CN113991619B - Current transfer circuit and current transfer device for direct current breaker - Google Patents
Current transfer circuit and current transfer device for direct current breaker Download PDFInfo
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- CN113991619B CN113991619B CN202111188484.3A CN202111188484A CN113991619B CN 113991619 B CN113991619 B CN 113991619B CN 202111188484 A CN202111188484 A CN 202111188484A CN 113991619 B CN113991619 B CN 113991619B
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- 239000003990 capacitor Substances 0.000 claims abstract description 105
- 238000010521 absorption reaction Methods 0.000 claims abstract description 43
- 230000000712 assembly Effects 0.000 claims description 33
- 238000000429 assembly Methods 0.000 claims description 33
- 239000012212 insulator Substances 0.000 claims description 6
- 230000021715 photosynthesis, light harvesting Effects 0.000 claims description 6
- 238000005265 energy consumption Methods 0.000 abstract description 23
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Classifications
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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 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, charging circuits are connected to two ends of the back pressure transfer capacitor, and the charging circuits are used for providing reverse voltage to the back pressure transfer capacitor before the second controllable switch tube is conducted; the energy consumption branch is connected with the first transfer branch and the second transfer branch in parallel so as to consume the electric quantity at the 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 direct current breaker switching.
Background
The direct current breaker is used as core equipment in the field of medium-voltage direct current distribution, and is not only used for bearing rated through current, but 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 does not have a natural zero crossing point, especially the amplitude of the short-circuit direct current is larger, special means are needed to realize the disconnection of the fault direct current.
The existing direct current breaking technology can adopt a forced zero crossing means to lead the arc current between the breaks of the vacuum circuit breaker to cross zero, and the technology has the defects that especially when the short circuit current is broken, the cost of the switch equipment is high, the degree of automation is low, the control points are more, the reliability of the quick switch is low, the short circuit arc current is very large, the arcing time between the breaks is easy to be too long, the important current carrying parts such as contacts are burnt, and serious electric power accidents are further caused.
In addition, the current transfer mode is mature in the existing direct current switching technology, for example, the invention patent with the publication number of CN108462486B discloses a high-voltage direct current breaker with a transfer branch and an energy consumption branch, the transfer branch and the energy consumption branch are respectively connected with a fast switch in a main circuit in parallel, an absorption capacitor is connected in the transfer branch in series, and a plurality of lightning arresters are connected in the energy consumption branch in series. When the current is required to be turned off, the IGBT in the electronic switch is turned off, the IGBT is turned on and then turned off quickly, when the IGBT is turned on to off, the current in the main circuit is transferred to the transfer branch, the absorption capacitor in the transfer branch is further 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, and the energy is consumed by the energy consumption branch. In the process, when the current in the main circuit is completely transferred, the current between the quick switch breaks crosses zero, and at the moment, the quick switch action realizes the turn-off.
When the main circuit with larger current is required to be turned off, the high-voltage direct-current circuit breaker with the transfer branch and the energy consumption branch needs to determine the number of diode units which need to be connected in series in each branch and the number of corresponding full-control switches according to the voltage level of the direct-current circuit breaker and the magnitude of the cut-off current. This way of changing the current turn-off capability by selecting a different number of components cannot efficiently achieve current turn-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 turn-off cannot be realized efficiently 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 transfer circuit for a direct current breaker, comprising:
the first wiring terminal and the second wiring terminal are respectively connected to two ends of the quick switch in the main circuit;
The first transfer branch is connected in series between the first wiring end and the second wiring end and comprises a first controllable switching tube, an absorption capacitor and a current-limiting resistor, wherein the first controllable switching tube is connected in parallel with the absorption capacitor, and the current-limiting resistor is connected in series with the absorption capacitor;
The second transfer branch is connected in parallel with the first transfer branch and comprises a second controllable switch tube and a back pressure transfer capacitor, the second controllable switch tube is connected in series with the back pressure transfer capacitor, charging circuits are connected to two ends of the back pressure transfer capacitor, and the charging circuits are used for providing reverse voltage for the back pressure transfer capacitor before the second controllable switch tube is conducted;
the energy-consuming branch is connected in parallel with the first transfer branch and the second transfer branch and comprises an energy-consuming device, and 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-consuming 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 is used for controlling the first controllable switch tube to be conducted when the current in the main circuit is smaller than a set value, and controlling 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 beneficial technical effects are as follows: according to the current transfer circuit, two transfer branches used for transferring different current are arranged in parallel, smaller current in the main circuit is directly transferred through the first transfer branch, larger current is transferred through the back pressure transfer capacitor in the second transfer branch, the first controllable switching tube is controlled to be conducted when the current is smaller than a set value through the controller, 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 transfer is respectively carried out according to the current, the current in the main circuit can be transferred efficiently, the current zero crossing of the current flowing through the fast switch in the main circuit is achieved, the fast switch is completely opened, and 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, a first group of diode assemblies and a second group of diode assemblies are arranged between the first wiring end and the second wiring end, the first group of diode assemblies comprise a first diode assembly and a second diode assembly, the second group of diode assemblies comprise a third diode assembly and a fourth diode assembly, the directions of the diode assemblies of the same group are the same, the directions of the diode assemblies of the two groups are opposite, the positive electrode of the first diode assembly is connected with the first wiring end, the negative electrode of the first diode assembly is connected with the positive electrode of the second diode assembly through a first controllable switch tube, the negative electrode of the second diode assembly is connected with the second wiring end, the positive electrode of the third diode assembly is connected with the second wiring end, the negative electrode of the second diode assembly is connected with the fourth diode assembly through a first controllable switch tube, and the negative electrode of the fourth diode assembly is connected with the first wiring end.
Further, in order to enable the voltage at two ends of the absorption capacitor to be completely consumed, the first transfer branch is provided with a reverse diode, the reverse diode is reversely connected with the first controllable switch tube in parallel, and the reverse diode is connected with the current limiting resistor and the absorption capacitor in parallel.
Further, the energy consumption device comprises an energy consumption lightning arrester connected in parallel with the absorption capacitor and the current limiting resistor.
Further, in order to ensure that the voltage equalizing effect is achieved, the energy consuming device comprises a voltage equalizing resistor connected in parallel with the energy consuming lightning arrester.
Further, in order to completely release the electric quantity at two ends of the back pressure transfer capacitor, the back pressure transfer capacitor is connected with a discharge resistor through a discharge switch so as to form a discharge loop after the second controllable switch tube is disconnected.
Further, in order to conveniently charge the back pressure transfer capacitor, a charging power supply is arranged in the charging circuit and is connected with the back pressure transfer capacitor through a charging switch so as to provide reverse voltage for the back pressure transfer capacitor.
The utility model provides a current transfer device for direct current 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 wiring terminal and the second wiring terminal are respectively connected to two ends of the quick switch in the main circuit;
The first transfer branch is connected in series between the first wiring end and the second wiring end and comprises a first controllable switching tube, an absorption capacitor and a current-limiting resistor, wherein the first controllable switching tube is connected in parallel with the absorption capacitor, and the current-limiting resistor is connected in series with the absorption capacitor;
The second transfer branch is connected in parallel with the first transfer branch and comprises a second controllable switch tube and a back pressure transfer capacitor, the second controllable switch tube is connected in series with the back pressure transfer capacitor, charging circuits are connected to two ends of the back pressure transfer capacitor, and the charging circuits are used for providing reverse voltage for the back pressure transfer capacitor before the second controllable switch tube is conducted;
the energy-consuming branch is connected in parallel with the first transfer branch and the second transfer branch and comprises an energy-consuming device, and 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-consuming 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 is used for controlling the first controllable switch tube to be conducted when the current in the main circuit is smaller than a set value, and controlling 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 beneficial technical effects are as follows: according to the current transfer circuit, two transfer branches used for transferring different current are arranged in parallel, smaller current in the main circuit is directly transferred through the first transfer branch, larger current is transferred through the back pressure transfer capacitor in the second transfer branch, the first controllable switching tube is controlled to be conducted when the current is smaller than a set value through the controller, 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 transfer is respectively carried out according to the current, the current in the main circuit can be transferred efficiently, the current zero crossing of the current flowing through the fast switch in the main circuit is achieved, the fast switch is completely opened, and 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, a first group of diode assemblies and a second group of diode assemblies are arranged between the first wiring end and the second wiring end, the first group of diode assemblies comprise a first diode assembly and a second diode assembly, the second group of diode assemblies comprise a third diode assembly and a fourth diode assembly, the directions of the diode assemblies of the same group are the same, the directions of the diode assemblies of the two groups are opposite, the positive electrode of the first diode assembly is connected with the first wiring end, the negative electrode of the first diode assembly is connected with the positive electrode of the second diode assembly through a first controllable switch tube, the negative electrode of the second diode assembly is connected with the second wiring end, the positive electrode of the third diode assembly is connected with the second wiring end, the negative electrode of the second diode assembly is connected with the fourth diode assembly through a first controllable switch tube, and the negative electrode of the fourth diode assembly is connected with the first wiring end.
Further, in order to enable the voltage at two ends of the absorption capacitor to be completely consumed, the first transfer branch is provided with a reverse diode, the reverse diode is reversely connected with the first controllable switch tube in parallel, and the reverse diode is connected with the current limiting resistor and the absorption capacitor in parallel.
Further, the energy consumption device comprises an energy consumption lightning arrester connected in parallel with the absorption capacitor and the current limiting resistor.
Further, in order to ensure that the voltage equalizing effect is achieved, the energy consuming device comprises a voltage equalizing resistor connected in parallel with the energy consuming lightning arrester.
Further, in order to completely release the electric quantity at two ends of the back pressure transfer capacitor, the back pressure transfer capacitor is connected with a discharge resistor through a discharge switch so as to form a discharge loop after the second controllable switch tube is disconnected.
Further, in order to conveniently charge the back pressure transfer capacitor, a charging power supply is arranged in the charging circuit and is connected with the back pressure transfer capacitor through a charging switch so as to provide reverse voltage for the back pressure transfer capacitor.
Further, in order to realize that each electrical component is integrated to be installed on the dolly, install first support, power electronic device and second support through the insulator on the dolly, first support, power electronic device and second support interval arrangement in proper order, the top of first support is fixed with first high-voltage vacuum contactor and second high-voltage vacuum contactor, first high-voltage discharge contactor is connected with first contact wiring row, second high-voltage vacuum contactor is connected with second contact wiring row, first contact wiring row constitutes first wiring end, second contact wiring row constitutes the second wiring end, the second shifts the branch road to be installed on the second support, power electronic device includes the exoframe, first branch road and power consumption branch road setting are in the exoframe.
Further, the first and second sets of diode assemblies are secured in side-by-side spaced relation on top of the outer frame.
Drawings
Fig. 1 is a schematic diagram of an embodiment 1 of a current transfer circuit for a dc breaker according to the present invention;
fig. 2 is a schematic diagram showing the overall structure of an embodiment 1 of a current transfer device for a dc breaker according to the present invention;
fig. 3 is a schematic view showing another overall structure of embodiment 1 of a current transfer device for a dc 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; 5a second high-voltage vacuum contactor; 6. a second diode assembly; 7. a third diode assembly; 8. a first diode assembly; 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 charged display; 17. a back pressure transfer capacitance; 18. a second bracket; 19. a discharge resistor; 20. a positive electrode terminal; 21. a negative electrode terminal; 22. an upper contact terminal row; 23. a lower contact terminal row; 24. an insulating fixing plate; 101. an anode of the electric power device; 102. a negative electrode of the electric power device; 103. a power electronic device; 104. a reverse diode; 107. an energy-consuming arrester; 108. an absorption capacitance; 109. a current limiting resistor; 110. equalizing resistance; 111. soft connection; 112. and a crank is connected.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention. The components of the 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 invention, as 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 made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
It is noted that relational terms such as "first" and "second", and the like, are 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. Moreover, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The features and capabilities of the present invention are described in further detail below in connection with the examples.
Specific example 1 of a current transfer device for a dc breaker of the present invention: as shown in fig. 1-3, the current transfer device comprises a current transfer circuit, as shown in fig. 1, comprising a first terminal and a second terminal, i.e. a and B in fig. 1, which, in use, are connected to the two ends of the fast switch in the main circuit, respectively, such that the whole current transfer circuit is connected in parallel with the fast switch.
A first transfer branch is connected in series between the first wiring terminal and the second wiring terminal, the first transfer branch comprises a first controllable switching tube T1 and an absorption capacitor CS, and the first controllable switching tube T1 is connected in parallel with the absorption capacitor CS. 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, charging circuits are connected to two ends of the back pressure transfer capacitor C, and the charging circuits are used for providing reverse voltage to the back pressure transfer capacitor C before the second controllable switch tube T2 is conducted, wherein the reverse direction refers to the direction opposite to the voltage direction in the main circuit.
The first controllable switch tube and the second controllable switch tube are thyristor components, wherein the conduction capacity 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, and 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 tube T1 is switched on to off, current in the main circuit is absorbed into the first transfer branch circuit, and the absorption capacitor CS is charged. When the second controllable switch tube T2 is conducted, the voltage direction in the back pressure transfer capacitor C is opposite to the voltage direction in the main circuit, so that the current in the main circuit is more easily absorbed into the second transfer branch, and the transfer current transferred into the second transfer branch fills up the original reverse voltage of the back pressure transfer capacitor, and then charges the back pressure transfer capacitor.
The current transfer circuit further comprises an energy consumption branch, an energy consumption device is arranged in the energy consumption branch, in the embodiment, the first transfer branch and the second transfer branch share the same energy consumption branch, the energy consumption branch is connected with the first transfer branch and the second transfer branch in parallel, and in the embodiment, the energy consumption device comprises a voltage equalizing resistor RG and an energy consumption arrester MOV, and the voltage equalizing resistor RG and the energy consumption arrester MOV are connected in parallel. When the voltage value at the two ends of the absorption capacitor CS or the counter-pressure transfer capacitor C reaches the conduction value of the energy consumption device, the absorption capacitor discharges to the energy consumption branch, the energy consumption device consumes the transfer current in the current transfer circuit, and when the current flowing through the break of the fast switch crosses zero, the fast switch is opened to finish turning off the current in the main circuit.
The first transfer branch is provided with a current-limiting resistor RS connected in series with the absorption capacitor and a reverse diode D5 connected in parallel with the absorption capacitor CS and the current-limiting resistor RS, and after the fast 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, so that the electric quantity at two ends of the absorption capacitor CS is rapidly consumed. The second transfer branch is provided with a discharge resistor R1 and a discharge switch K3 which are connected with the back pressure transfer capacitor in parallel, and a fast switch Guan Duankou in the main circuit, wherein the residual electric quantity at the two ends of the back pressure transfer capacitor is consumed by the discharge resistor.
In this embodiment, a charging power supply is arranged in the charging circuit for charging the back-pressure transfer capacitor, the charging power supply is a stabilized voltage supply TM, and the charging power supply is connected with the back-pressure transfer capacitor through a charging switch K4, a charging resistor R2 and a rectifying diode D6, so that the charging power supply is more convenient to charge, and meanwhile, the rectifying diode can prevent current from flowing reversely.
In this embodiment, a first group of diode assemblies and a second group of diode assemblies are arranged between the first terminal and the second terminal, the first group of diode assemblies comprises a first diode assembly D1 and a second diode assembly D4, the second group of diode assemblies comprises a third diode assembly D2 and a fourth diode assembly D3, the directions of the diode assemblies in the same group are the same, the directions of the diode assemblies in the two groups are opposite, the positive electrode of the first diode assembly D1 is connected with the first terminal, the negative electrode of the first diode assembly D1 is connected with the positive electrode of the second diode assembly D4 through a first controllable switch, the negative electrode of the second diode assembly D4 is connected with the second terminal, the positive electrode of the third diode assembly D2 is connected with the second terminal, the negative electrode of the fourth diode assembly D3 is connected with the first terminal through a first controllable switch. Through setting up two sets of diode assemblies, can realize that whole electric current transfer return circuit can forward access again can reverse access, can adapt to different quick switch, improves adaptability. A first high-voltage vacuum contactor K1 is connected in series between the first wiring end and the first diode component, and a second high-voltage vacuum contactor K2 is connected in series between the second wiring end and the second diode component.
The specific structure of the current transfer device in the present invention will be described below in conjunction with the above current transfer circuit, and 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, where the first support 3, the power electronic device 10, and the second support 18 are mounted on a base of the cart 1 through insulation of the insulator 3, and 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 electronics device comprises an outer frame, and the absorption capacitor 108, the current limiting resistor 109, the voltage equalizing resistor 110 and the energy dissipating lightning arrester 107 in the first transfer branch and the energy dissipating branch are respectively arranged in the outer frame.
The current transfer device further comprises an upper contact wire row 22, a lower contact wire 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 bracket 3 at intervals in the front-back direction, one end of the upper contact wire row 22 is connected with the first high-voltage vacuum contactor 4, and the other end is used for being connected with an upper contact of a quick switch in a main circuit; one end of the lower contact wire 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 a main circuit, and the upper contact wire row 22 and the lower contact wire row 23 respectively form a first wiring terminal and a second wiring terminal in the current transfer circuit.
The first high-voltage vacuum contactor 4 is connected with the first diode assembly 8 and the fourth diode assembly 9 through a busbar, and the second high-voltage vacuum contactor 5 is connected with the second diode assembly 6 and the third diode assembly 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, the two groups of diode assemblies being fixed side by side at a distance on top of the outer frame of the electrical power device arrangement 10. The third diode assembly 7 and the fourth diode assembly 9 are connected to the positive terminal 20 of the power electronics device 10 by a busbar; the second diode assembly 6 and the first diode assembly 8 are connected to the negative terminal 21 of the power electronics device 10 by a busbar; an insulating fixing plate 24 on top of the outer frame is used to support the busbar.
In the 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 with a back pressure transfer capacitor 17 through a busbar, the other end of the second thyristor assembly is connected with a negative terminal 21 of a power electronic device through the busbar, the other end of the back pressure transfer capacitor 17 is connected with a positive terminal 20 of the power electronic device through the busbar, the back pressure transfer capacitor 17 is connected with a discharge resistor 19 in parallel 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 consists 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 charging display 16 is used for displaying the charging state of the back pressure transfer capacitor 17. The controller 13 performs an automatic control logic process of the entire current transfer device, and the controller 13 is fixed to the top of the second bracket 18. The charging of the counter-pressure 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 bracket 18.
The power electronics device 10 includes a power electronics device 103, with the electronics device positive electrode 101 connected to the power electronics device positive terminal 20 and the power electronics device negative electrode 102 connected to the power electronics device negative terminal 21. In this embodiment, the two ends of the power electronic device 103 are connected in parallel with the absorption capacitor 108 by the soft connection 111 and the current limiting resistor 109 through the busbar anti-parallel reverse diode 104, and meanwhile, the two ends of the power electronic device 103 are connected in parallel with the equalizing resistor 110 and the energy dissipation lightning arrester MOV107 through the busbar. In addition, the power electronics device is provided with a drive power source for driving the first and second thyristor assemblies, a drive contactor, and a connecting crank 112, the connecting crank 112 for supporting the photodiode 104.
When the current transfer device is used, when the direct current smaller 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 high-speed switch high arc voltage; when the whole current of the main circuit is transferred to the current transfer circuit in the current transfer device, the controller 13 controls the power electronic device 103 of the power electronic device 10 to be disconnected when the fast switch in the main circuit is completely opened, the transfer current charges the absorption capacitor 108, and when the voltage across the absorption capacitor 108 is larger than the conduction voltage of the energy dissipation lightning arrester MOV107, the transfer current is consumed through the energy dissipation lightning arrester MOV107, and the direct current smaller than 4000A is completed after the disconnection. While the residual voltage across the snubber capacitor 108 in the power electronics device 10 is rapidly dissipated by the current limiting resistor 109.
When the direct current larger than or equal to 4000A is cut off, 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 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 transfer current, when the voltage at two ends of the back pressure transfer capacitor 17 is larger than the conducting voltage of the energy dissipation lightning arrester MOV107, the transfer current is consumed through a loop of the energy dissipation lightning arrester 107, meanwhile, the main circuit is rapidly switched on completely, and the direct current larger than 4000A is cut off.
As another embodiment of the present invention, unlike embodiment 1, there is: only the first group of diode assemblies may be provided, or only the second group of diode assemblies may be provided.
As another embodiment of the present invention, unlike embodiment 1, there is: the two ends of the back pressure transfer capacitor are not connected with the discharge resistor.
As another embodiment of the present invention, unlike embodiment 1, there is: the snubber capacitor and the current limiting resistor may not be connected in parallel with the reverse diode.
As another embodiment of the present invention, unlike embodiment 1, there is: the charging resistor and the rectifier diode may not be provided in the charging circuit.
As another embodiment of the present invention, unlike embodiment 1, there is: the equalizing resistor may not be provided.
The embodiment of the current transfer circuit for the direct current breaker is the same as the current transfer circuit of the embodiment of the current transfer device, and is not repeated.
The above description is only a preferred embodiment of the present invention, and the patent protection scope of the present invention is defined by the claims, and all equivalent structural changes made by the specification and the drawings of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A current transfer circuit for a direct current breaker, comprising: the first wiring terminal and the second wiring terminal are respectively connected to two ends of the quick switch in the main circuit; the first transfer branch is connected in series between the first wiring end and the second wiring end and comprises a first controllable switching tube, an absorption capacitor and a current-limiting resistor, wherein the first controllable switching tube is connected in parallel with the absorption capacitor, and the current-limiting resistor is connected in series with the absorption capacitor;
the second transfer branch is connected in parallel with the first transfer branch and comprises a second controllable switch tube and a back pressure transfer capacitor, the second controllable switch tube is connected in series with the back pressure transfer capacitor, charging circuits are connected to two ends of the back pressure transfer capacitor, and the charging circuits are used for providing reverse voltage for the back pressure transfer capacitor before the second controllable switch tube is conducted; the conduction capacity of the first controllable switch tube is weaker than that of the second controllable switch tube;
the energy-consuming branch is connected in parallel with the first transfer branch and the second transfer branch and comprises an energy-consuming device, and 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-consuming 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 is used for controlling the first controllable switch tube to be conducted when the current in the main circuit is smaller than a set value, and controlling the second controllable switch tube to be conducted when the current in the main circuit is larger than or equal to the set value.
2. The current transfer circuit for a dc breaker according to claim 1, wherein a first group of diode assemblies and a second group of diode assemblies are provided between the first terminal and the second terminal, the first group of diode assemblies includes a first diode assembly and a second diode assembly, the second group of diode assemblies includes a third diode assembly and a fourth diode assembly, directions of the diode assemblies of the same group are the same, directions of the diode assemblies of the two groups are opposite, an anode of the first diode assembly is connected with the first terminal, a cathode of the first diode assembly is connected with an anode of the second diode assembly through a first controllable switch, a cathode of the second diode assembly is connected with the second terminal, an anode of the third diode assembly is connected with the second terminal, and a cathode of the fourth diode assembly is connected with the first terminal through the first controllable switch.
3. The current transfer circuit for a dc breaker according to claim 1 or 2, wherein the first transfer branch is provided with a reverse diode, the reverse diode is connected in anti-parallel with the first controllable switching tube, and the reverse diode is connected in parallel with the current limiting resistor and the absorption capacitor.
4. The current transfer circuit for a direct current breaker according to claim 1 or 2, characterized in that the energy consuming device comprises an energy consuming lightning arrester connected in parallel with an absorption capacitance and a current limiting resistance.
5. The current transfer circuit for a dc breaker according to claim 4, wherein the energy consuming device comprises a voltage equalizing resistor connected in parallel with the energy consuming arrester.
6. The current transfer circuit for a dc 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 switching tube is opened.
7. The current transfer circuit for a dc 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 reverse voltage to the back-voltage transfer capacitor.
8. A current transfer device for a direct current breaker, characterized by comprising a trolley on which a current transfer module is mounted, the current transfer module comprising the current transfer circuit of any one of claims 1-7.
9. The current transfer device for a dc breaker according to claim 8, wherein the first bracket, the power electronic device and the second bracket are installed on the cart 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 wire row, the second high-voltage vacuum contactor is connected with a second contact wire row, the first contact wire row forms a first terminal, the second contact wire row forms a second terminal, the second transfer branch is installed on the second bracket, the power electronic device comprises an external frame, and the first transfer branch and the energy dissipation branch are arranged in the external frame.
10. The current transfer apparatus for a dc breaker according to claim 9, wherein the first and second sets of diode assemblies are fixed to the top of the outer frame side by side at a distance.
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