CN104022494B - The alternating current-direct current mating protection method and device of flexible direct current transmission converter station breaker - Google Patents
The alternating current-direct current mating protection method and device of flexible direct current transmission converter station breaker Download PDFInfo
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Abstract
The present invention relates to the alternating current-direct current mating protection method and device of flexible direct current transmission converter station breaker, it is characterised in that：Flexible direct current transmission converter station protection device for circuit breaker is divided into harmonics device and direct current protecting device; shared out the work and help one another by harmonics device and direct current protecting device, cooperate and carry out far jumping onto a grade protection of the breaker realization to flexible direct current transmission converter station breaker；Harmonics region is mainly comprising connection transformer T, alternating current inlet wire breaker DL, exchange end disconnecting switch DS and exchange end current measuring unit CT；Direct current region mainly includes two transverter converter, starting-up later time resistance R and DC terminal disconnecting switch DS, the smoothing reactor L of DC line, bridge arm reactor L and DC measurement CT, PT, DC terminal disconnecting switch DS.The present invention removes the dead band that current conversion station is protected by the seamless cooperation of harmonics device and direct current protecting device; broken down in current conversion station and the remote function of jumping onto grade breaker is realized in the case of breaker tripping; with the function of realizing breaker fail protection, the reliability of change of current stand control protection equipment is improved.
Description
Technical field
The present invention relates to a kind of alternating current-direct current mating protection method and device of flexible direct current transmission converter station breaker.Belong to
Direct current conveys electric equipment technical field.
Background technology
At present, it is width that flexible DC power transmission, which is based on voltage source converter and pulse width modulating technology by DC voltage inversion,
Value and phase all controllable alternating voltages, independently can quickly control transmitted active power and reactive power, enhance defeated
The flexibility of electricity, as the stable power transmission mode being most potential being coupled realized between Large Scale Wind Farm Integration and major network.
As shown in figure 1, the flexible direct current transmission converter station of prior art typically using line change group into and out of line mode, lead to
The outlet of Chang Yiduan connection wind power plants, other end connection exchange bulk power grid.Because the two ends current conversion station of prior art all only has one
Individual AC circuit breaker, in the case of occurring any failure in station, can only cut off trouble point by unique breaker in the station
With the connection of AC network, therefore, to ensure the safety of flexible direct current transmission converter station expensive power electronic equipment, in breaker
By far jumping wind power plant or AC network breaker in the case of failure；Wind can not be caused because of breaker failure malfunction simultaneously
Electricity can not be sent outside.The breaker protection and its failure protection are the most important things in flexible direct current transmission converter station protection equipment,
The mutual cooperation of harmonics and direct current protecting is needed to realize that short-circuit mistake can be reduced to greatest extent by both having ensured that equipment safety had
The malfunction that spirit is far jumped.
Prior art is to breaker protection, and the general breaker failure using the line change group mode of connection, which starts, passes through breaker
Auxiliary protection device is realized.As shown in Fig. 2 start criterion be protection act and flow through breaker three-phase current be more than adjust
It is worth (rated current), failure protection is exported after the delay of two conditions is met simultaneously, far jumping onto level by far jumping interface arrangement breaks
Road device realizes breaker fail protection function.
The technical scheme can only solve open circuit in the case of DC bipolar earth fault and ac bus three-phase ground failure
Device failure far jumps onto a grade breaker, and the electric current of alternating current inlet wire is all because the presence of trouble point is climbed in the case of both failures.
For the failure such as direct-current polar single-phase earthing in other regions of current conversion station DC side, the failure such as valve area internal short-circuit is not
The condition of alternating current inlet wire electric current increase can be met.In DC side singlephase earth fault occurs for the converter valve based on voltage source converter
When direct current protecting action breaker tripping operation simultaneously locking converter valve, change of current valve blocking and make it that power is not swapped, even if
The electric current of DC side single-phase earthing or valve area generation short trouble AC all only has the electric current of tens Amps, by CT
No-load voltage ratio after (if for 3200:1) circuit-breaker failure portection equipment is entered, because the electric current of circuit-breaker failure portection equipment is sentenced
According to minimum 0.08 ampere, secondary current after no-load voltage ratio less than protection can setting range can not meet start failure protection bar
Part.In this case breaker failure tripping, failure protection criterion is unsatisfactory for starting remote jump condition, causes higher level's breaker can not
Correct tripping operation, not only damages the expensive power electronic equipment of current conversion station, while fault zone is expanded.
The content of the invention
An object of the present invention, is to be applied for conventional circuit breaker failure protection based on voltage source converter current conversion station
In defect there is provided a kind of alternating current-direct current mating protection method of flexible direct current transmission converter station breaker.
A kind of second object of the present invention, the alternating current-direct current for being to provide for flexible direct current transmission converter station breaker coordinates guarantor
Protection unit.
Merely with current conversion station, interface arrangement is far jumped in other startups of control protection equipment increase with criterion to the purpose of this patent
Tripping operation outlet eliminates the defect.A kind of breaker fail protection design of criterion with voltage is proposed, using tradition open circuit
Do not increase extra equipment zero defect in the case of device based Cb Failure Protection and realize breaker fail protection.
An object of the present invention can be reached by adopting the following technical scheme that：
The alternating current-direct current mating protection method of flexible direct current transmission converter station breaker, it is characterised in that：Flexible direct current is defeated
Electric current conversion station protection device for circuit breaker is divided into harmonics device and direct current protecting device, is protected by harmonics device and direct current
Protection unit is shared out the work and help one another, and is cooperated and is carried out the remote guarantor for jumping onto grade breaker realization to flexible direct current transmission converter station breaker
Shield；
1) harmonics device starting protection, in the case of breaker failure, harmonics device detects breaker
The TJR nodes of control box close, i.e. harmonics device action, judge breaker without just when alternating current is more than rated value
Normal tripping, trouble point is unanimously present, and cuts off trouble point in order to reliable, harmonics device sends the remote order for jumping onto grade breaker
Trouble point is cut off to the remote breaker for jumping interface arrangement Yuan Tiao offsides transformer station；
2) direct current protecting device starting protection, the TJR nodes of the logical detection breaker operation cabinet of direct current protecting device and valve side
Magnitude of voltage come judge short circuit whether failure, the TJR nodes that direct current protecting device detects breaker operation cabinet are closed, i.e., direct current is protected
Protection unit is acted, and judges that breaker does not have normal tripping when voltage on valve side is more than rated value 70%, in order to reliably cut off failure
Point, direct current protecting device sends the remote order for jumping onto grade breaker to be come to the remote breaker for jumping interface arrangement Yuan Tiao offsides transformer station
Trouble point is cut off.
An object of the present invention can also be reached by adopting the following technical scheme that：
Further, breaker is realized using regular circuit breakers based Cb Failure Protection in flexible direct current converter station communication area
Failure far jumps onto the structure of grade breaker, and criterion is harmonics unit protection action and current on line side；The direct current in direct current region
Protection device, station level control device, direct current electrode protector are by increasing the jump with protection device protection act and voltage criterion
Lock outlet starts remote interface arrangement of jumping and directly far jumps onto a grade breaker；Pass through communication area protection and the protection of direct current locality protection
The mutual cooperation of device, in the case of breaker failure, no dead angle realizes that starting remote jump interface arrangement tripping operation realizes to the change of current
Stand the protection of inner breaker.
Further, in the case of breaker failure voltage on valve side unanimously to remain original rated voltage constant；Directly
Flowing the protection device in region can realize by increasing voltage criterion and the remote jump interface arrangement of delay tripping outlet startup and far jump onto level
The function of breaker.
The second object of the present invention can be reached by adopting the following technical scheme that：
The alternating current-direct current mating protection device of flexible direct current transmission converter station breaker, its design feature is：Including exchange
Protection zone and direct current protecting region, harmonics region is mainly comprising connection transformer T, alternating current inlet wire breaker DL, exchange
Hold disconnecting switch DS and exchange end current measuring unit CT；Direct current region mainly includes two transverter converter, started back
Road resistance R and DC terminal disconnecting switch DS, the smoothing reactor L of DC line, bridge arm reactor L and DC measurement CT,
PT, DC terminal disconnecting switch DS；The input for exchanging end current measuring unit CT is exchanged by exchanging end disconnecting switch DS connections
The input of power network, the input of its output end connection harmonics device and transformer T；Harmonics device has failure guarantor
One of protection structure, the TJR nodes provided with breaker protection control box, the remote input for jumping interface arrangement of its output end connection；Become
Depressor T test side is by exchanging side resistance R, current measuring unit CT ground connection, transformer T two tunnels of output end point, the first via
By exchanging the input of detection unit PT connection direct currents region protection device, direct current region protection device has failure protection knot
Structure, the TJR nodes provided with breaker protection control box, the two of the remote input for jumping interface arrangement of its output end connection, the second tunnel
The input of the start-up circuit in direct current protecting region, the output end of the start-up circuit is connected by one of DC side measuring unit
The control signal on No. two transverter loop, each transverter loop is by smoothing reactor L, DC measurement CT, PT, transverter
Converter and DC terminal disconnecting switch DS are formed by connecting；The remote output end for jumping interface arrangement connects offside power transformation by optical fiber
Stand the input of breaker operation cabinet, carry out tripping operation control.
The second object of the present invention can also be reached by adopting the following technical scheme that：
Further, the power of wind power plant is sent into by alternating current inlet wire, enters direct current region by the boosting for connecting transformer,
The electric current of the starting-up later time limitation transverter charging in direct current region, protects transverter.
Further, harmonics region and direct current protecting region are separate, constitute the independent protective knot of regional
Structure,.
Further, in the case of breaker failure, harmonics device detects the TJR nodes of breaker operation cabinet
Close, harmonics device action, harmonics device sends the remote order for jumping onto grade breaker and far jumped to remote interface arrangement of jumping
The breaker of offside transformer station cuts off trouble point.
Further, the single-phase earthing in direct current region, transverter cooling failure, inverter inside failure is protected by direct current
The TJR nodes of the logical detection breaker operation cabinet of protection unit judge with voltage on valve side value short circuit whether failure, direct current protecting device
The TJR nodes for detecting breaker operation cabinet close, i.e. direct current protecting device action, and now voltage on valve side is more than rated value 70%
In the case of prove breaker there is no normal tripping.
The present invention has beneficial effect prominent as follows：
1st, the present invention sets communication area to protect and direct current locality protection, passes through harmonics device and direct current protecting device
Seamless cooperation remove the dead band of whole current conversion station protection, broken down in current conversion station and can in the case of breaker tripping
By realizing the remote function of jumping onto grade breaker, it is to avoid fault coverage expands；With the function of realizing breaker fail protection, improve
The reliability of change of current stand control protection equipment.
2nd, alternating current-direct current mating protection method and device of the present invention, due to being using in flexible direct current transmission converter station
Existing equipment be designed and configure, be not required to increase new equipment, accordingly, it is capable to reduce engineering on the basis of enhanced protection function
Investment.
3, alternating current-direct current mating protection method and device of the present invention, it is sea turn to solve offshore wind farm power network and dissolve
A great problem in electricity construction.
4th, alternating current-direct current mating protection method and device of the present invention, the failure such as line-to-ground in communication area is main
Become ground connection and ac bus ground connection conventional circuit breaker based Cb Failure Protection can be started by electric current criterion it is remote jump, direct current region it is straight
Flow Line single-phase earthing, the failure such as valve area internal short-circuit is unsatisfactory for the situation of the electric current criterion of conventional circuit breaker based Cb Failure Protection
A grade breaker is far jumped onto by the voltage criterion start failure protection of the protection device in direct current region；Protected with communication area in direct current region
The cooperation of device causes energy correct start failure protection remote jump device of the various failures in alternating current inlet wire breaker device failure in current conversion station
Outlet tripping operation.
Brief description of the drawings
Fig. 1 is conventional flexible direct current converter station wiring construction schematic diagram.
Fig. 2 is regular circuit breakers failure protection action logic schematic diagram.
Fig. 3 is that the breaker failure of alternating current-direct current protection cooperation of the present invention starts logic diagram.
Fig. 4 is the breaker fail protection circuit diagram for the alternating current-direct current protection cooperation that the specific embodiment of the invention 1 is related to.
Fig. 5 is that the breaker failure for the alternating current-direct current protection cooperation that the specific embodiment of the invention 1 is related to starts logic diagram.
The breaker that Fig. 6 is the present invention normally trips oscillogram.
Embodiment
Specific embodiment 1：
Reference picture 3, the alternating current-direct current mating protection device for the flexible direct current transmission converter station breaker that the present embodiment is related to, bag
Harmonics region and direct current protecting region are included, communication area mainly includes connection transformer T, lead-in circuit breaker DL, kept apart
Close DS and current measuring unit CT；Direct current region mainly includes transverter converter, the resistance R of starting-up later time and kept apart
Close DS, the smoothing reactor L of DC line, bridge arm reactor L and DC measurement CT, PT, DC terminal disconnecting switch DS；Hand over
The input for flowing end current measuring unit CT is protected by exchanging end disconnecting switch DS connections AC network, the connection exchange of its output end
The input of protection unit and transformer T input；Harmonics device has failure protection structure, provided with breaker protection behaviour
Make one of the TJR nodes of case, the remote input for jumping interface arrangement of its output end connection；Transformer T test side passes through AC
Resistance R, current measuring unit CT are grounded, and transformer T two tunnels of output end point, the first via is straight by exchanging detection unit PT connections
The input of locality protection device is flowed, direct current region protection device has failure protection structure, provided with breaker protection control box
TJR nodes, the two of the remote input for jumping interface arrangement of its output end connection, the start-up circuit in the second road direct current protecting region
Input, the output end of the start-up circuit connects the control input in No. two transverter loops by one of DC side measuring unit
End, each transverter loop is kept apart by smoothing reactor L, DC measurement CT, PT, transverter converter and DC terminal
DS is closed to be formed by connecting；The remote output end for jumping interface arrangement connects the input of offside substation breakers control box by optical fiber,
Carry out tripping operation control.
In the present embodiment：
Transformer T, lead-in circuit breaker DL, disconnecting switch DS and current measuring unit CT are connected by conventional connection transformation
Device, lead-in circuit breaker, disconnecting switch and current measurement circuit are constituted, transverter converter, the resistance R of starting-up later time and every
Leave pass DS, the smoothing reactor L of DC line, bridge arm reactor L and DC measurement CT, PT, DC terminal disconnecting switch
DS is by the transverter of routine techniques, the resistance of electronic starting circuit and disconnecting switch, smoothing reactor, bridge arm reactor and direct current
Measuring cell, DC terminal disconnecting switch are constituted.
The power of wind power plant is sent into by alternating current inlet wire, enters direct current region, direct current region by the boosting for connecting transformer
Starting-up later time limitation transverter charging electric current, protect transverter.Power, which enters transverter, to carry out the conversion of direct current and then leads to
Cross DC line be sent to receiving end current conversion station carry out inversion on deliver stream bulk power grid.
Harmonics region and direct current protecting region are separate, and the protection of regional is realized by different devices,
The result of exchange and the action of direct current protecting device is all to jump alternating current inlet wire breaker.
In the case of breaker failure, the TJR nodes that harmonics device detects breaker operation cabinet close, that is, hand over
Protection device action is flowed, and proves that breaker does not have normal tripping in the case that now alternating current is more than rated value；Trouble point
It is consistent to exist, trouble point is cut off in order to reliable, harmonics device sends the remote order for jumping onto grade breaker and gives remote jumper connection mouthful dress
The breaker of Zhi Yuantiao offsides transformer station cuts off trouble point.
Fault current in the case of the single-phase earthing in direct current region, transverter cooling failure, the failure such as inverter inside failure
It can not embody above the CT of alternating current inlet wire, the electric current for now exchanging progress does not change, be opened by harmonics device
Dynamic failure protection can not cut off failure.The TJR nodes of the logical detection breaker operation cabinet of direct current protecting device come with voltage on valve side value
Judge short circuit whether failure, the TJR nodes that direct current protecting device detects breaker operation cabinet are closed, i.e., direct current protecting device is moved
Make, and prove that breaker does not have normal tripping in the case that now voltage on valve side is more than rated value 70%.By Fig. 3 it is known that
Voltage on valve side can quickly fall to 0 in the case of breaker tripping, therefore setting valve uses 0~Ue, and setting valve is specified electricity
The 70% of pressure is relatively reasonable.Trouble point is cut off in order to reliable, direct current protecting device sends the remote order for jumping onto grade breaker to remote
The breaker for jumping interface arrangement Yuan Tiao offsides transformer station cuts off trouble point.
Harmonics device start failure protection signal by detecting TJR=1 and I ＞ Ie, both sides relation be with relation；
Direct current protecting device start failure protection signal by detecting TJR=1 and U ＞ 70%Ue, both sides relation be with relation；It is remote to jump
Interface arrangement receives the harmonics device come simultaneously and the start failure protection signal of direct current protecting device far jumps onto a grade breaker, no
Pipe be direct current protecting device or harmonics device unsuccessful reason signal be all it is effective, both be or relation, offside
The signal that transformer station receives failure is tripped by breaker operation cabinet to the breaker of the side.
Reference picture 4- Fig. 6, the alternating current-direct current mating protection method of flexible direct current transmission converter station breaker of the present invention,
It is characterized in that：Flexible direct current transmission converter station protection device for circuit breaker is divided into harmonics device and direct current protecting device,
Shared out the work and help one another by harmonics device and direct current protecting device, cooperate and far jump onto grade breaker realization to flexible straight
Flow the protection of power transmission converter station breaker；
1) harmonics device starting protection, in the case of breaker failure, harmonics device detects breaker
The TJR nodes of control box close, i.e. harmonics device action, judge breaker without just when alternating current is more than rated value
Normal tripping, trouble point is unanimously present, and cuts off trouble point in order to reliable, harmonics device sends the remote order for jumping onto grade breaker
Trouble point is cut off to the remote breaker for jumping interface arrangement Yuan Tiao offsides transformer station；
2) direct current protecting device starting protection, the TJR nodes of the logical detection breaker operation cabinet of direct current protecting device and valve side
Magnitude of voltage come judge short circuit whether failure, the TJR nodes that direct current protecting device detects breaker operation cabinet are closed, i.e., direct current is protected
Protection unit is acted, and judges that breaker does not have normal tripping when voltage on valve side is more than rated value 70%, in order to reliably cut off failure
Point, direct current protecting device sends the remote order for jumping onto grade breaker to be come to the remote breaker for jumping interface arrangement Yuan Tiao offsides transformer station
Trouble point is cut off.
Further, breaker is realized using regular circuit breakers based Cb Failure Protection in flexible direct current converter station communication area
Failure far jumps onto the structure of grade breaker, and criterion is harmonics unit protection action and current on line side；The direct current in direct current region
Protection device, station level control device, direct current electrode protector are by increasing the jump with protection device protection act and voltage criterion
Lock outlet starts remote interface arrangement of jumping and directly far jumps onto a grade breaker；Pass through communication area protection and the protection of direct current locality protection
The mutual cooperation of device, in the case of breaker failure, no dead angle realizes that starting remote jump interface arrangement tripping operation realizes to the change of current
Stand the protection of inner breaker.
Further, in the case of breaker failure voltage on valve side unanimously to remain original rated voltage constant；Directly
Flowing the protection device in region can realize by increasing voltage criterion and the remote jump interface arrangement of delay tripping outlet startup and far jump onto level
The function of breaker.
Claims (8)
1. the alternating current-direct current mating protection method of flexible direct current transmission converter station breaker, it is characterised in that：By flexible DC power transmission
Current conversion station protection device for circuit breaker is divided into harmonics device and direct current protecting device, passes through harmonics device and direct current protecting
Device is shared out the work and help one another, and is cooperated and is carried out far jumping onto a grade protection of the breaker realization to flexible direct current transmission converter station breaker；
1）Harmonics device starting protection, in the case of breaker failure, harmonics device detects breaker operator
The TJR nodes of case close, i.e. harmonics device action, judge that breaker is not jumped normally when alternating current is more than rated value
Open, trouble point is unanimously present, cut off trouble point in order to reliable, harmonics device sends the remote order for jumping onto grade breaker to remote
The breaker for jumping interface arrangement Yuan Tiao offsides transformer station cuts off trouble point；
2）Direct current protecting device starting protection, direct current protecting device is electric by the TJR nodes and valve side for detecting breaker operation cabinet
Pressure value come judge short-circuit protection whether failure, the TJR nodes that direct current protecting device detects breaker operation cabinet close, i.e. direct current
Protection device is acted, and judges that breaker does not have normal tripping when voltage on valve side is more than rated value 70%, in order to reliably cut off failure
Point, direct current protecting device sends the remote order for jumping onto grade breaker to be come to the remote breaker for jumping interface arrangement Yuan Tiao offsides transformer station
Trouble point is cut off.
2. the alternating current-direct current mating protection method of flexible direct current transmission converter station breaker according to claim 1, its feature
It is：Realize that breaker failure far jumps onto level using regular circuit breakers based Cb Failure Protection in flexible direct current converter station communication area
The structure of breaker, criterion is harmonics unit protection action and current on line side, is judged when alternating current is more than rated value
Breaker does not have normal tripping；Direct current protecting device, station level control device, the direct current electrode protector in direct current region pass through increase
Tripping operation outlet with protection device protection act and voltage criterion starts remote interface arrangement of jumping and directly far jumps onto a grade breaker；Pass through
The mutual cooperation of the protection device of communication area protection and direct current locality protection, in the case of breaker failure, no dead angle is real
Now start the remote protection for jumping interface arrangement tripping operation realization to current conversion station inner breaker.
3. the alternating current-direct current mating protection method of flexible direct current transmission converter station breaker according to claim 1 or 2, it is special
Levy and be：Unanimously to remain original rated voltage constant for voltage on valve side in the case of breaker failure；The guarantor in direct current region
Protection unit starts remote interface arrangement of jumping and can realize the remote work(for jumping onto grade breaker by increasing voltage criterion and delay tripping outlet
Energy.
4. the alternating current-direct current mating protection device of flexible direct current transmission converter station breaker, it is characterised in that：Including harmonics area
Domain and direct current protecting region, harmonics region is mainly comprising connection transformer T, alternating current inlet wire breaker DL, the isolation of exchange end
Switch DS and exchange end current measuring unit CT；Direct current region mainly includes two transverter converter, starting-up later time resistance
R and DC terminal disconnecting switch DS, the smoothing reactor L of DC line, bridge arm reactor L and DC measurement CT, PT, direct current
Hold disconnecting switch DS；Exchange end current measuring unit CT input by exchange end disconnecting switch DS connections AC network, its
Output end connects the input of harmonics device；Harmonics device has failure protection structure, provided with breaker protection behaviour
Make one of the TJR nodes of case, the remote input for jumping interface arrangement of its output end connection；Transformer T test side passes through AC
Resistance R, exchange end current measuring unit CT ground connection, transformer T two tunnels of output end point, the first via is by exchanging detection unit PT
The input of direct current region protection device is connected, direct current region protection device has failure protection structure, provided with breaker protection
The TJR nodes of control box, the two of the remote input for jumping interface arrangement of its output end connection, the second tunnel connection direct current protecting region
The input of start-up circuit, the output end of the start-up circuit connects No. two transverter loops by one of DC side measuring unit
Control signal, each transverter loop is by smoothing reactor L, DC measurement CT, PT, transverter converter and straight
Stream end disconnecting switch DS is formed by connecting；The remote output end for jumping interface arrangement connects offside substation breakers control box by optical fiber
Input, carry out tripping operation control.
5. according to the alternating current-direct current mating protection device of claim 4 flexible direct current transmission converter station breaker, it is characterised in that：Wind
The power of electric field is sent into by alternating current inlet wire, enters direct current region, the starting-up later time in direct current region by the boosting for connecting transformer
The electric current of transverter charging is limited, transverter is protected.
6. according to the alternating current-direct current mating protection device of the flexible direct current transmission converter station breaker of claim 4 or 5, its feature exists
In：Harmonics region and direct current protecting region are separate, constitute the independent protective structure of regional.
7. according to the alternating current-direct current mating protection device of the flexible direct current transmission converter station breaker of claim 4 or 5, its feature exists
In：In the case of breaker failure, the TJR nodes that harmonics device detects breaker operation cabinet close, harmonics
Device action, harmonics device sends the remote order for jumping onto grade breaker and jumps the disconnected of interface arrangement Yuan Tiao offsides transformer station to remote
Road device cuts off trouble point.
8. according to the alternating current-direct current mating protection device of the flexible direct current transmission converter station breaker of claim 4 or 5, its feature exists
In：The single-phase earthing in direct current region, transverter cooling failure, inverter inside failure detects open circuit by direct current protecting device
The TJR nodes of device control box judge with voltage on valve side value short-circuit protection whether failure, direct current protecting device detects breaker
The TJR nodes of control box are closed, i.e. direct current protecting device action, and now voltage on valve side is proved in the case of being more than rated value 70%
Breaker does not have normal tripping.
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| CN201410279228.9A CN104022494B (en) | 2014-06-21 | 2014-06-21 | The alternating current-direct current mating protection method and device of flexible direct current transmission converter station breaker |
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| CN201410279228.9A CN104022494B (en) | 2014-06-21 | 2014-06-21 | The alternating current-direct current mating protection method and device of flexible direct current transmission converter station breaker |
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