CN112886555B - Integrated direct-current circuit breaker, direct-current transmission line and fault removing method - Google Patents
Integrated direct-current circuit breaker, direct-current transmission line and fault removing method Download PDFInfo
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- CN112886555B CN112886555B CN202110236720.8A CN202110236720A CN112886555B CN 112886555 B CN112886555 B CN 112886555B CN 202110236720 A CN202110236720 A CN 202110236720A CN 112886555 B CN112886555 B CN 112886555B
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention discloses an integrated direct current circuit breaker, a direct current transmission line and a fault removing method. This integrated type direct current breaker includes: the circuit comprises a first main through-current branch, a second main through-current branch, an oscillation commutation branch, a first trigger switch and a second trigger switch; the first main through-current branch comprises a first mechanical switch and a first lightning arrester, and the first mechanical switch is connected with the first lightning arrester in parallel; the second main through-current branch comprises a second mechanical switch and a second lightning arrester, and the second mechanical switch is connected with the second lightning arrester in parallel; the oscillation current conversion branch circuit provides high-frequency oscillation current for the first mechanical switch or the second mechanical switch in the process of disconnecting the first mechanical switch or the second mechanical switch; the first trigger switch is connected between the second end of the first main through-current branch and the second end of the oscillation commutation branch in series; the second trigger switch is connected in series between the second end of the second main through-current branch and the second end of the oscillating commutation branch. The invention realizes the effects of high economy and equipment miniaturization of the direct current transmission line.
Description
Technical Field
The embodiment of the invention relates to a direct-current transmission technology, in particular to an integrated direct-current circuit breaker, a direct-current transmission line and a fault removing method.
Background
The direct-current line parallel multi-loop power transmission mode can improve the power transmission capacity, the power transmission reliability and the availability ratio, and is widely applied to direct-current power transmission.
The direct current circuit breaker is a key device in a direct current transmission system, and mainly plays a role in quickly cutting off fault current of the direct current transmission system, so that the accident range is prevented from being enlarged. The mechanical direct current circuit breaker has the advantages of low cost, small on-state loss and the like, and is widely applied to direct current transmission engineering. Therefore, in order to quickly and reliably switch the line, a mechanical direct-current circuit breaker must be respectively arranged at the head end and the tail end of each circuit in a direct-current line parallel multi-circuit power transmission mode, so that the number of required direct-current circuit breakers is greatly increased.
Along with the improvement of the voltage and current grade of the power transmission line, the capacity and the volume of the parallel capacitor inductor of the mechanical direct current circuit breaker are increased by square times, so that a larger field area is required, and the application cost is greatly increased.
Disclosure of Invention
The invention provides an integrated direct current circuit breaker, a direct current transmission line and a fault removing method, which are used for achieving the effects of high economy of the direct current transmission line and miniaturization of equipment.
In a first aspect, an embodiment of the present invention provides an integrated dc circuit breaker, including: the circuit comprises a first main through-current branch, a second main through-current branch, an oscillation current conversion branch, a first trigger switch and a second trigger switch; the first main through-current branch comprises a first mechanical switch and a first lightning arrester, and the first mechanical switch is connected with the first lightning arrester in parallel; the second main through-current branch comprises a second mechanical switch and a second lightning arrester, and the second mechanical switch is connected with the second lightning arrester in parallel; the first end of the oscillation commutation branch circuit is respectively connected with the first end of the first main through-current branch circuit and the first end of the second main through-current branch circuit, and is used for providing high-frequency oscillation current for the first mechanical switch or the second mechanical switch in the process of disconnecting the first mechanical switch or the second mechanical switch; the first trigger switch is connected between the second end of the first main through-current branch and the second end of the oscillating commutation branch in series; and the second trigger switch is connected between the second end of the second main through-current branch and the second end of the oscillating commutation branch in series.
Optionally, the first trigger switch and the second trigger switch are both kept off under the condition that a power transmission line connected with the integrated direct current circuit breaker normally works; under the condition that a power transmission line connected with the integrated direct current circuit breaker works abnormally, when the first mechanical switch contact is disconnected to a preset distance, the first trigger switch is closed, and when the second mechanical switch contact is disconnected to the preset distance, the second trigger switch is closed.
Optionally, when the power transmission line connected to the first mechanical switch fails, the first mechanical switch performs a disconnection action; and when the transmission line connected with the second mechanical switch breaks down, the second mechanical switch performs disconnection action.
Optionally, when the voltage across the first mechanical switch exceeds a preset value, the first arrester acts to consume the voltage across the first mechanical switch; and when the voltage at the two ends of the second mechanical switch exceeds a preset value, the second lightning arrester acts to consume the voltage at the two ends of the second mechanical switch.
Optionally, the integrated dc circuit breaker further includes: a first bus side terminal, a second bus side terminal, a first outlet side terminal, and a second outlet side terminal; the first end of the first main through-flow branch is used as a first bus-bar side terminal, the first end of the second main through-flow branch is used as a second bus-bar side terminal, and the first bus-bar side terminal and the second bus-bar side terminal are both used for connecting a bus; the second end of the first main through-current branch serves as a first wire outlet side terminal, the second end of the second main through-current branch serves as a second wire outlet side terminal, and the first wire outlet side terminal and the second wire outlet side terminal are used for being connected with respective direct-current transmission lines.
Optionally, the oscillating commutation branch comprises: at least one first capacitor and at least one first inductor;
the first capacitor and the first inductor are connected in series between the first end and the second end of the oscillating commutation branch 130, the two ends of the first capacitor are externally connected with a detachable charging power supply, and the detachable charging power supply is used for charging the first capacitor.
Optionally, the first arrester and the second arrester are both zinc oxide arresters.
In a second aspect, an embodiment of the present invention further provides a direct current transmission line, where the direct current transmission line includes: the power supply comprises two integrated direct current circuit breakers, a first transmission line, a second transmission line, a first bus, a second bus, a first converter valve, a second converter valve, a first converter transformer and a second converter transformer;
the two ends of the first transmission line are respectively connected with first outlet side terminals of the two integrated direct current circuit breakers, the two ends of the second transmission line are respectively connected with second outlet side terminals of the two integrated direct current circuit breakers, a first bus side terminal and a second bus side terminal of one integrated direct current circuit breaker are respectively connected with the first bus, a first bus side terminal and a second bus side terminal of the other integrated direct current circuit breaker are respectively connected with the second bus, the first bus is connected with a first alternating current system through the first converter valve and the first converter transformer, and the second bus is connected with a second alternating current system through the second converter valve and the second converter transformer.
In a third aspect, an embodiment of the present invention further provides a fault removal method, where the method is implemented by using the integrated dc circuit breaker according to the claim, and is applied to the dc transmission line, where the method includes:
controlling a first mechanical switch directly connected with a fault line to perform disconnection action;
when the disconnection distance of the two moving contacts of the first mechanical switch reaches a preset distance, the first trigger switch is closed;
the first mechanical switch completes the disconnection action;
the first trigger switch is turned off.
Optionally, before the first mechanical switch directly connected to the faulty line performs the opening action, the method further includes:
charging the first capacitor by using an external detachable charging power supply;
when the voltage difference between the two ends of the first capacitor reaches a preset value, the connection between the external detachable charging power supply and the first capacitor is disconnected after charging is completed.
The integrated type direct current circuit breaker, the direct current transmission line and the fault removing method are characterized in that two main current through branches are arranged for the integrated type direct current circuit breaker and used for disconnecting or connecting a direct current transmission bus and the direct current transmission line, an oscillation current conversion branch is used for providing high-frequency oscillation to extinguish electric arcs of a mechanical switch, a first trigger switch and a second trigger switch can trigger a closed state or an open state respectively according to states of a first mechanical switch and a second mechanical switch, a first lightning arrester and a second lightning arrester prevent the electric arcs of the first mechanical switch and the second mechanical switch from being re-ignited in the process of opening actions, the two parallel main current through branches share the same oscillation current conversion branch, the number of required circuit breakers is reduced, the size of the circuit breakers is also reduced, the connection between a fault line and the bus is broken when the parallel direct current transmission lines are in fault, the occupied area of the circuit breakers is reduced, and the effects of high economy and miniaturization of equipment are achieved.
Drawings
Fig. 1 is a circuit diagram of an integrated dc circuit breaker according to an embodiment of the present invention;
fig. 2 is a circuit diagram of another integrated dc circuit breaker according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a dc transmission line according to an embodiment of the present invention;
FIG. 4 is a flow chart of a method for removing a fault according to an embodiment of the present invention;
fig. 5 is a flowchart of another fault removal method according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings, not all of them.
It should be noted that the following embodiments of the present invention may be implemented individually, or may be implemented in combination with each other, and the embodiments of the present invention are not limited in this respect. Various components are described using "first", "second", etc. in the embodiments of the present invention, but these components should not be limited by these terms, which are merely used to distinguish one component from another component. Also, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The embodiment of the invention provides an integrated direct current breaker. Fig. 1 is a circuit diagram of an integrated dc circuit breaker according to an embodiment of the present invention, and referring to fig. 1, the integrated dc circuit breaker 100 includes: the first main current branch 110, the second main current branch 120, the oscillating commutation branch 130, the first trigger switch K1 and the second trigger switch K2; the first main current branch 110 comprises a first mechanical switch CB1 and a first arrester M1, the first mechanical switch CB1 and the first arrester M1 being connected in parallel; the second main current branch 120 comprises a second mechanical switch CB2 and a second arrester M2, the second mechanical switch CB2 and the second arrester M2 being connected in parallel; the first end of the oscillating commutation branch 130 is connected to the first end of the first main current branch 110 and the first end of the second main current branch, and is configured to provide a high-frequency oscillating current for the first mechanical switch CB1 or the second mechanical switch CB2 in a process that the first mechanical switch CB1 or the second mechanical switch CB2 is turned off; the first trigger switch K1 is connected in series between the second end of the first main current-carrying branch 110 and the second end of the oscillating commutation branch 130; the second trigger switch K2 is connected in series between the second terminal of the second main current carrying branch 120 and the second terminal of the oscillating commutation branch 130.
Wherein the first main current branch 110 is a switching branch connectable between the bus and the first power line, and the first mechanical switch CB1 is operable to control the bus in a connected or disconnected relationship with the first power line; the first mechanical switch CB1 opens when the first power line fails, disconnecting the bus bar from the first power line. The first lightning arrester M1 is connected with the first mechanical switch CB1 in parallel, and in the process of the disconnection action of the first mechanical switch CB1, if the voltage at the two ends of the first mechanical switch CB1 exceeds a set value, the first lightning arrester M1 can act to consume the voltage at the two ends of the first mechanical switch CB1, so that the arc is prevented from being formed between the two moving contacts of the first mechanical switch CB1 again. The second main current branch 120 is a switching branch that can be connected between the bus and the second power line and can control the connection or disconnection of the bus to the second power line. The second mechanical switch CB2 opens when the second power line fails, disconnecting the bus bar from the second power line. The second lightning arrester M2 is connected in parallel with the second mechanical switch CB2, and if the voltage across the second mechanical switch CB2 exceeds the set value during the opening operation of the second mechanical switch CB2, the second lightning arrester M2 can operate to consume the voltage across the second mechanical switch CB2, thereby preventing the two moving contacts of the second mechanical switch CB2 from forming an arc again. The oscillating commutation branch 130 is a branch capable of generating a high-frequency oscillating current, and when the first mechanical switch CB1 or the second mechanical switch CB2 is turned off, the oscillating commutation branch 130 may provide the high-frequency oscillating current for the first mechanical switch CB1 or the second mechanical switch CB2, so that a zero crossing point is generated in a turn-off current flowing through the mechanical switch, and an arc is extinguished conveniently. The first trigger switch K1 is kept open when the power transmission line connected to the integrated dc circuit breaker 100 is in normal operation, and is triggered to close when the first mechanical switch CB1 performs an opening action, so that two ends of the oscillating commutation branch circuit 130 can be directly connected to two ends of the first mechanical switch CB 1; the second trigger switch K2 is kept open when the power transmission line connected to the integrated dc circuit breaker 100 is in normal operation, and is triggered to be closed when the second mechanical switch CB2 is in an open state, so that the two ends of the oscillating commutation branch 130 can be directly connected to the two ends of the second mechanical switch CB 2.
Illustratively, under the condition that two power transmission lines connected with the integrated direct current circuit breaker 100 both work normally, the first mechanical switch CB1 and the second mechanical switch CB2 both keep closed, the first trigger switch K1 and the second trigger switch K2 both keep open, and at this time, the two power transmission lines and the bus bar both keep on. If one power transmission line has a fault, for example, the power transmission line directly connected with the first mechanical switch CB1 has a fault, the first mechanical switch CB1 performs a disconnection action; when the distance between the two moving contacts of the first mechanical switch CB1 reaches the preset distance, the first trigger switch K1 is closed, so that the two ends of the oscillation commutation branch circuit 130 are directly connected with the two ends of the first mechanical switch CB1, the oscillation commutation branch circuit 130 generates high-frequency oscillation current and passes through the first mechanical switch CB1, the turn-off current flowing through the first mechanical switch CB1 generates a zero crossing point, and then the electric arc between the two moving contacts of the first mechanical switch CB1 is extinguished. After the electric arc between the two moving contacts of the first mechanical switch CB1 is extinguished, the voltage at the two ends of the first mechanical switch CB1 is quickly increased, if no other operation exists, the electric arc between the two moving contacts is easily reignited, therefore, when the voltage at the two ends of the first mechanical switch CB1 exceeds a preset value, the first lightning arrester M1 acts to consume the voltage at the two ends of the first mechanical switch CB1, at the moment, the first mechanical switch CB1 continues to perform disconnection action until the distance between the two moving contacts of the first mechanical switch CB1 reaches the maximum, at the moment, the first mechanical switch CB1 finishes disconnection, namely, the connection between the bus and the fault power transmission line is disconnected; and finally, controlling the first trigger switch K1 to be switched off.
The integrated direct-current circuit breaker provided by the embodiment of the invention is provided with two main through-current branches for disconnecting or connecting a direct-current transmission bus and a direct-current transmission line, an oscillation current conversion branch for providing high-frequency oscillation current, a first trigger switch and a second trigger switch which can trigger a closed state or a disconnected state respectively according to the states of the first mechanical switch and the second mechanical switch, a first lightning arrester and a second lightning arrester can prevent electric arc from reigniting in the process of disconnecting the first mechanical switch and the second mechanical switch, the arrangement that the two parallel main through-current branches share the same oscillation current conversion branch not only reduces the number of required circuit breakers, but also reduces the volume of the circuit breakers, realizes the connection of a fault line and the bus when the parallel direct-current transmission line fails, reduces the occupied area of the circuit breakers, and achieves the effects of high economy and miniaturization of equipment of the direct-current transmission line.
With continued reference to fig. 1, optionally, in a case where the power transmission line connected to the integrated dc circuit breaker 100 is operating normally, both the first trigger switch K1 and the second trigger switch K2 are kept open; under the condition that a power transmission line connected with the integrated type direct current circuit breaker 100 abnormally works, when a contact of the first mechanical switch CB1 is disconnected to a preset distance, the first trigger switch K1 is closed, and when a contact of the second mechanical switch CB2 is disconnected to the preset distance, the second trigger switch K2 is closed.
With reference to fig. 1, optionally, when the power transmission line connected to the first mechanical switch CB1 fails, the first mechanical switch CB1 performs an opening action; when the transmission line connected with the second mechanical switch CB2 breaks down, the second mechanical switch CB2 does disconnection action.
When the voltage at the two ends of the first mechanical switch CB1 exceeds a preset value, the first lightning rod acts to consume the voltage at the two ends of the first mechanical switch CB 1; when the voltage across the second mechanical switch CB2 exceeds a preset value, the second lightning rod acts to consume the voltage across the second mechanical switch CB 2.
Wherein, the first lightning arrester M1 and the second lightning arrester M2 can both be zinc oxide lightning arresters.
According to the integrated direct current circuit breaker provided by the embodiment of the invention, the first trigger switch and the second trigger switch can trigger a closed state or an open state respectively according to the states of the first mechanical switch and the second mechanical switch, the arrangement that the two parallel main through-current branches share the same oscillation current conversion branch not only reduces the number of required circuit breakers, but also reduces the size of the circuit breaker, the lightning arrester prevents electric arc from reigniting, the connection between a fault line and a bus is disconnected when the parallel direct current transmission line fails, the occupied area of the circuit breaker is reduced, and the effects of high economy, high safety and miniaturization of direct current transmission equipment are achieved.
With continued reference to fig. 1, optionally, the integrated dc circuit breaker 100 further comprises: a first bus side terminal 140, a second bus side terminal 150, a first outlet side terminal 160, and a second outlet side terminal 170; the first end of the first main through-flow branch 110 serves as a first bus-side terminal 140, the first end of the second main through-flow branch 120 serves as a second bus-side terminal 150, and both the first bus-side terminal 140 and the second bus-side terminal 150 are used for connecting a bus; the second end of the first main current branch 110 is used as a first outlet terminal 160, the second end of the second main current branch 120 is used as a second outlet terminal 170, and the first outlet terminal 160 and the second outlet terminal 170 are used for connecting respective direct current transmission lines.
Illustratively, the first and second bus- side terminals 140 and 150 connect the dc bus, and the first and second outlet- side terminals 160 and 170 connect two different power transmission lines. When one of the power transmission lines breaks down, the mechanical switch directly connected with the power transmission line does disconnection action, for example, the first mechanical switch CB1 does disconnection action, when the distance between the two moving contacts of the first mechanical switch CB1 reaches a preset distance, the first trigger switch K1 is closed, so that the two ends of the oscillation commutation branch 130 are directly connected with the two ends of the first mechanical switch CB1, the oscillation commutation branch 130 generates high-frequency oscillation current and passes through the first mechanical switch CB1, the turn-off current flowing through the first mechanical switch CB1 generates a zero crossing point, and further, the electric arc between the two electric shocks is extinguished. After the electric arc between the two moving contacts of the first mechanical switch CB1 is extinguished, the voltage at the two ends of the first mechanical switch CB1 is quickly increased, if no other operation exists, the electric arc between the two moving contacts is easily reignited, therefore, when the voltage at the two ends of the first mechanical switch CB1 exceeds a preset value, the first lightning arrester M1 acts to consume the voltage at the two ends of the first mechanical switch CB1, at the moment, the first mechanical switch CB1 continues to perform disconnection action until the distance between the two moving contacts of the first mechanical switch CB1 reaches the maximum, at the moment, the first mechanical switch CB1 finishes disconnection, namely, the connection between the bus and the fault power transmission line is disconnected; finally, the first trigger switch K1 is turned off.
The integrated type direct current circuit breaker provided by the embodiment of the invention is provided with the first bus side terminal 140, the second bus side terminal, the first outlet side terminal and the second outlet side terminal, so that the connection of the integrated type direct current circuit breaker with the bus and the transmission line is realized, the integrated type direct current circuit breaker can disconnect a fault line from the bus when the parallel direct current transmission line has a fault, and the effect of high reliability of direct current transmission equipment is achieved.
Fig. 2 is a circuit diagram of another integrated dc circuit breaker provided in the embodiment of the present invention, referring to fig. 2, optionally, the oscillating commutation branch 130 includes: at least one first capacitor C1 and at least one first inductor L1; the first capacitor C1 and the first inductor L1 are connected in series between the first end and the second end of the oscillation commutation branch 130, the two ends of the first capacitor C1 are externally connected with a detachable charging power supply, and the detachable charging power supply is used for charging the first capacitor C1.
The first capacitor C1 may be externally connected to a rechargeable power source for charging, when the first trigger switch K1 and the second trigger switch K2 are both turned off, voltages at two ends of the first capacitor C1 are unchanged, and when the first trigger switch K1 or the second trigger switch K2 is turned on, the first capacitor C1 discharges, so that the oscillation commutation branch 130 generates a high-frequency oscillation current, and the high-frequency oscillation current may cause a zero crossing point of a current flowing through the mechanical switch, thereby causing an arc between two moving contacts of the mechanical switch to be extinguished.
Exemplarily, under the condition that direct current transmission line normally works, the first electric capacity C1 both ends can be connected the external rechargeable power source that can dismantle and charge, and when the voltage at first electric capacity C1 both ends was higher than the preset voltage then can dismantle rechargeable power source and stop charging first electric capacity C1, first electric capacity C1 accomplishes and charges. When one of two parallel-connected power transmission lines has a fault, a mechanical switch directly connected with the power transmission line does disconnection action, for example, the first mechanical switch CB1 does disconnection action, when the distance between two moving contacts of the first mechanical switch CB1 reaches a preset distance, the first trigger switch K1 is closed, the first capacitor C1 discharges, the current forms high-frequency oscillation current through the first inductor L1 and flows through the first mechanical switch CB1 which does not cut off the electric arc, so that the turn-off current flowing through the first mechanical switch CB1 generates a zero crossing point, and the electric arc between the two moving contacts is extinguished. After the electric arc between two moving contacts of first mechanical switch CB1 extinguishes, the voltage at two ends of first mechanical switch CB1 will rise fast, if there is not other operation, the electric arc between two electric contacts is very easy to reignite, so, when the voltage at two ends of first mechanical switch CB1 exceeds the default, first arrester M1 moves in order to consume the voltage at two ends of first mechanical switch CB1, first mechanical switch CB1 continues to do the disconnection action this moment, until the distance between two moving contacts of first mechanical switch CB1 reaches the biggest. At the moment, the first mechanical switch CB1 finishes disconnection, namely the connection between the bus and the fault power transmission line is disconnected; finally, the first trigger switch K1 is turned off.
The integrated direct current circuit breaker provided by the embodiment of the invention is provided with the first capacitor and the first inductor, and can provide high-frequency oscillating current for the mechanical switch when the power transmission line has a fault, so that the turn-off current flowing through the first mechanical switch generates a zero crossing point, the electric arc between two moving contacts of the mechanical switch is easier to extinguish, and the effect of the integrated direct current circuit breaker on more efficient cutting-off of the fault power transmission line is achieved.
The embodiment of the invention also provides a direct current transmission line. Fig. 3 is a circuit diagram of a dc transmission line according to an embodiment of the present invention, referring to fig. 3, where the dc transmission line 300 includes: the integrated dc circuit breaker 100 according to the embodiment of the present invention includes two integrated dc circuit breakers 100, a first transmission line 301, a second transmission line 302, a first bus 303, a second bus 304, a first converter valve 305, a second converter valve 306, a first converter transformer 307, and a second converter transformer 308;
the first transmission line 301 has two ends connected to the first outlet-side terminals 160 of the two integrated dc breakers 100, the second transmission line 302 has two ends connected to the second outlet-side terminals 170 of the two integrated dc breakers 100, the first bus 303-side terminal 140 and the second bus 304-side terminal 150 of one integrated dc breaker 100 are connected to the first bus 303, the first bus 303-side terminal 140 and the second bus 304-side terminal 150 of the other integrated dc breaker 100 are connected to the second bus 304, the first bus 303 is connected to the first ac system through the first converter valve 305 and the first converter transformer 307, and the second bus 304 is connected to the second ac system through the second converter valve 306 and the second converter transformer 308.
Illustratively, when the first power transmission line 301 fails, the first mechanical switches CB1 of both integrated type dc circuit breakers 100 perform an opening action. When the distance between two moving contacts of the first mechanical switch CB1 reaches a preset distance, the first trigger switches K1 of the two integrated dc circuit breakers 100 are both closed, the first capacitor C1 discharges, the generated current forms a high-frequency oscillating current through the first inductor L1, and flows through the first mechanical switch CB1 which has not cut off the arc, so that the turn-off current flowing through the first mechanical switch CB1 generates a zero crossing point, and then the arc between the two moving contacts of the first mechanical switch CB1 is extinguished. After the arc between the two movable contacts of the first mechanical switch CB1 is extinguished, the voltage across the first mechanical switch CB1 will rise rapidly, and when the voltage across the first mechanical switch CB1 exceeds a preset value, the first arrester M1 acts to consume the voltage across the first mechanical switch CB1, thereby preventing the arc from being reignited between the two movable contacts of the first mechanical switch CB1, and at this moment, the first mechanical switch CB1 continues to perform a breaking action until the distance between the two movable contacts of the first mechanical switch CB1 reaches the maximum. At this time, the first mechanical switches CB1 of the two integrated dc breakers 100 are all turned off, that is, the first bus 303 and the second bus 304 are disconnected from the first power transmission line 301; finally, the first trigger switches K1 of the two integrated type dc breakers 100 are opened.
According to the direct-current transmission line provided by the embodiment of the invention, the integrated direct-current circuit breaker is connected between the bus and the two transmission lines, the integrated direct-current circuit breaker is utilized to complete the removal of the fault line in the parallel transmission lines, the integrated direct-current circuit breaker adopts the shared oscillation commutation branch to reduce the volume of the circuit breaker, the removal of the fault line is realized, the normal work of other lines is not influenced, and the effects of high efficiency, small influence and small occupied area in fault removal are achieved.
The embodiment of the invention also provides a fault removing method. Fig. 4 is a flowchart of a fault removal method provided in an embodiment of the present invention, and referring to fig. 4, the method is implemented by using the integrated dc circuit breaker provided in the embodiment of the present invention, and is applied to a dc transmission line provided in the embodiment of the present invention, and the method includes:
401. when the first power transmission line has a fault, a first mechanical switch directly connected with the first power transmission line is controlled to do an opening action.
The two first mechanical switches directly connected with the fault line generally belong to two integrated direct-current circuit breakers respectively; the disconnection action is the separation action of two moving contacts of the mechanical switch.
402. When the disconnection distance of the two moving contacts of the first mechanical switch reaches a preset distance, the first trigger switch is closed.
Specifically, when the disconnection distance between the two moving contacts of the first mechanical switch reaches a preset distance, the first trigger switch is closed, so that the first capacitor discharges, the generated current forms high-frequency oscillation current through the first inductor and flows through the first mechanical switch which is not cut off the electric arc, the turn-off current flowing through the first mechanical switch generates a zero crossing point, and the electric arc between the two moving contacts of the first mechanical switch is extinguished. After the arc between the two moving contacts of the first mechanical switch is extinguished, the voltage across the first mechanical switch will rise rapidly, and when the voltage across the first mechanical switch exceeds a preset value, the first arrester acts to consume the voltage across the first mechanical switch, preventing the arc from reigniting between the two moving contacts of the first mechanical switch.
403. The first mechanical switch completes the opening action.
The completion of the disconnection action means that the distance between the two moving contacts of the switch reaches the maximum;
404. the first trigger switch is turned off.
Specifically, after the first mechanical switch finishes the opening action, the first trigger switch is opened, and at the moment, the first mechanical switch already breaks the connection between the first power transmission line with the fault and the bus, so that the normal work of the second power transmission line is not influenced.
The fault removal method provided by the embodiment of the invention is realized by adopting the integrated direct current circuit breaker, and the integrated direct current circuit breaker is utilized to complete the removal of the fault line in the parallel transmission line, so that the fault line can be removed without influencing the normal work of other lines, and the effects of more efficient fault removal and less influence are achieved.
Fig. 5 is a flowchart of another fault removal method according to an embodiment of the present invention, and referring to fig. 5, before the first mechanical switch directly connected to the fault line performs the opening operation, the method further includes:
501. charging the first capacitor by using an external detachable charging power supply;
502. when the voltage difference between the two ends of the first capacitor reaches a preset value, the connection between the external detachable charging power supply and the first capacitor is disconnected after charging is completed.
According to the integrated direct current circuit breaker, the direct current transmission line and the fault removal method provided by the embodiment of the invention, the common oscillation commutation branch is arranged, so that electric arcs between moving contacts of a mechanical switch connected with a fault line can be quickly extinguished, the size of the circuit breaker can be reduced, the fault line can be removed without influencing the normal work of other lines, and the effects of more efficient fault removal and less influence are achieved.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements and substitutions will now be apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (8)
1. An integrated type direct current circuit breaker, comprising: the circuit comprises a first main through-current branch, a second main through-current branch, an oscillation current conversion branch, a first trigger switch and a second trigger switch;
the first main through-flow branch comprises a first mechanical switch and a first arrester, and the first mechanical switch and the first arrester are connected in parallel;
the second main through-current branch comprises a second mechanical switch and a second lightning arrester, and the second mechanical switch is connected with the second lightning arrester in parallel;
the first end of the oscillation commutation branch circuit is respectively connected with the first end of the first main through-current branch circuit and the first end of the second main through-current branch circuit, and is used for providing high-frequency oscillation current for the first mechanical switch or the second mechanical switch in the process of disconnecting the first mechanical switch or the second mechanical switch;
the first trigger switch is connected between the second end of the first main through-current branch and the second end of the oscillation commutation branch in series;
the second trigger switch is connected between the second end of the second main through-current branch and the second end of the oscillation commutation branch in series;
under the condition that the power transmission line connected with the integrated direct current circuit breaker works normally, the first trigger switch and the second trigger switch are both kept disconnected;
when the transmission line connected with the first mechanical switch breaks down, the first mechanical switch is disconnected; when the first mechanical switch contact is disconnected to a preset distance, the first trigger switch is closed;
when the transmission line connected with the second mechanical switch breaks down, the second mechanical switch is disconnected; and when the second mechanical switch contact is disconnected to a preset distance, the second trigger switch is closed.
2. The integrated type dc circuit breaker according to claim 1, wherein the first arrester operates to consume the voltage across the first mechanical switch when the voltage across the first mechanical switch exceeds a preset value; and when the voltage at the two ends of the second mechanical switch exceeds a preset value, the second lightning arrester acts to consume the voltage at the two ends of the second mechanical switch.
3. The integrated type dc circuit breaker according to claim 1, further comprising: a first bus side terminal, a second bus side terminal, a first outlet side terminal, and a second outlet side terminal;
the first end of the first main through-flow branch is used as a first bus-bar side terminal, the first end of the second main through-flow branch is used as a second bus-bar side terminal, and the first bus-bar side terminal and the second bus-bar side terminal are both used for connecting a bus;
the second end of the first main through-flow branch serves as a first outgoing line side terminal, the second end of the second main through-flow branch serves as a second outgoing line side terminal, and the first outgoing line side terminal and the second outgoing line side terminal are used for being connected with respective direct-current transmission lines.
4. The integrated type dc circuit breaker according to claim 1, wherein the oscillating commutation branch 130 comprises: at least one first capacitor and at least one first inductor;
the first capacitor and the first inductor are connected in series between the first end and the second end of the oscillation commutation branch circuit, the two ends of the first capacitor are externally connected with a detachable charging power supply, and the detachable charging power supply is used for charging the first capacitor.
5. The integrated type dc circuit breaker according to claim 1, wherein the first arrester and the second arrester are each a zinc oxide arrester.
6. A direct current transmission line, comprising: -two integrated dc breakers according to any of the claims 1-5, a first transmission line, a second transmission line, a first busbar, a second busbar, a first converter valve, a second converter valve, a first converter transformer and a second converter transformer;
the two ends of the first transmission line are respectively connected with first outlet-side terminals of the two integrated direct-current circuit breakers, the two ends of the second transmission line are respectively connected with second outlet-side terminals of the two integrated direct-current circuit breakers, a first bus-side terminal and a second bus-side terminal of one integrated direct-current circuit breaker are respectively connected with the first bus, a first bus-side terminal and a second bus-side terminal of the other integrated direct-current circuit breaker are respectively connected with the second bus, the first bus is connected with a first alternating-current system through the first converter valve and the first converter transformer, and the second bus is connected with a second alternating-current system through the second converter valve and the second converter transformer.
7. A method for removing a fault, wherein the method is implemented by using the integrated dc circuit breaker of any one of claims 1 to 5, and is applied to the dc transmission line of claim 6, and the method comprises:
controlling a first mechanical switch directly connected with a fault line to perform disconnection action;
when the disconnection distance of the two moving contacts of the first mechanical switch reaches a preset distance, the first trigger switch is closed;
the first mechanical switch completes the opening action;
the first trigger switch is turned off.
8. The fault clearing method according to claim 7, wherein before the first mechanical switch directly connected to the fault line performs the opening action, further comprising:
charging the first capacitor by using an external detachable charging power supply;
and when the voltage difference between the two ends of the first capacitor reaches a preset value, the external detachable charging power supply is disconnected from the first capacitor after charging is completed.
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