CN107171279A - A kind of mixed type dc circuit breaker and its method for dividing - Google Patents
A kind of mixed type dc circuit breaker and its method for dividing Download PDFInfo
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- CN107171279A CN107171279A CN201710414497.5A CN201710414497A CN107171279A CN 107171279 A CN107171279 A CN 107171279A CN 201710414497 A CN201710414497 A CN 201710414497A CN 107171279 A CN107171279 A CN 107171279A
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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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- 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
- H02H3/02—Details
- H02H3/021—Details concerning the disconnection itself, e.g. at a particular instant, particularly at zero value of current, disconnection in a predetermined order
-
- 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
- H02H3/10—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 additionally responsive to some other abnormal electrical conditions
Abstract
Disclose a kind of mixed type dc circuit breaker and its method for dividing, mixed type dc circuit breaker is composed in series by multiple identical breaker modules, each breaker module includes main current loop, electric current shifts branch road, overvoltage limits branch road and on-line monitoring system, high speed machine is switched, electric current shifts branch road and overvoltage limitation branch circuit parallel connection, pass through the series connection of multiple identical hybrid circuit breaker modules, applied voltage grade can be improved, realize the short circuit breaking of high-voltage system, and the short-circuit current-limiting function in the case of voltage levels can be realized by the progress separating brake action of control section breaker module.
Description
Technical field
It is particularly a kind of disconnected by multiple hybrid direct currents the present invention relates to mixed type dc circuit breaker and its method for dividing
Road device block coupled in series realizes the application in voltage levels field.
Background technology
Direct current transmission and distribution system has the advantage that compared to traditional exchange electrical power trans mission/distribution system：Narrower transmission of electricity corridor,
Transmission line capability is big, and transmission losses is lower, and direct current network is compared to AC network, in the absence of stability problem, without harmonic wave, trend
It is more prone to control.But it is due to that natural zero-crossing point is not present in straight-flow system, is formed after fracture, electric arc can not extinguish, it is necessary to
Artificial manufacture current zero-crossing point, makes arc extinction.By high speed machine switch with large power semiconductor device constitute it is hybrid straight
Stream breaker has the advantages that discharge capacity is big, turn-off speed is fast, current limiting capacity is strong, has become the research that direct current cut-offs field
Focus.Straight-flow system is from 1.8kV to tens kilovoltages at this stage, and topological structure of the same race can not adapt to different voltage class
Direct current cut-off task, on the other hand with the increase of voltage class, the dc circuit breaker insulating Design of single break is more complicated.
Disclosed above- mentioned information is used only for strengthening the understanding to background of the present invention in the background section, it is thus possible to
Include the information of prior art known to a person of ordinary skill in the art in not constituting home.
The content of the invention
The deficiency or defect existed for above-mentioned prior art is hybrid straight it is an object of the invention to provide being pressed in one kind
Flow breaker and its control method.The breaker is made up of multiple identical breaker modules, can be according to the electricity of system
Level requirements are pressed, the multiple single-stage breaker modules of assembling series connection are chosen, it is possible to achieve adapt to the task of different voltage class demands.
Meanwhile, with the lifting of voltage class, the series connection of multiple single-stage breaker modules can be solved as voltage class is improved, Dan Duan
The insurmountable Insulation Problems of mouth.
The purpose of the present invention is to be achieved by the following technical programs.
A kind of an aspect of of the present present invention, mixed type dc circuit breaker is connected by n identical single-stage breaker modules
Composition, wherein C1 to Cn+1 is n+1 single-stage breaker module system access end, wherein the single-stage breaker module includes master
Current loop, electric current transfer branch road, overvoltage limitation branch road, the incoming end Ci of on-line monitoring system and single-stage breaker module,
Ci+1, wherein 1≤i≤n, and main current loop, transfer current branch road and overvoltage limitation branch circuit parallel connection.
The main current loop is composed in series by high speed machine switch and power diode VD1, wherein：
The positive pole of the incoming end Ci+1 connections power diode VD1 so as to realize the incoming end Ci+1 with it is described
The connection of the other end of main current loop；
One end of the incoming end Ci connections high speed machine switch is to realize the incoming end Ci and the main electricity
Flow back to the connection of road one end.
The electric current transfer branch road includes IGCT component VT1, vibration inductance L and transfer electric capacity C, wherein, thyristor groups
Part VT1 positive poles are connected with incoming end Ci, and IGCT component VT1 negative poles are connected with vibration inductance L, vibrate the inductance L other ends and turn
Move electric capacity C to be connected, the transfer electric capacity C other ends are connected with incoming end Ci+1, wherein the transfer electric capacity C poles being connected with incoming end
Post one end is positive charged.
On-line monitoring system includes being used to measure flowing through the current sensor D0 of incoming end Ci, Ci+1 electric current, being used for
Measurement flows through the current sensor D1 of main current loop, the current sensor of circuit in electric current transfer branch road is flowed through for measuring
D2, for measurement stream through overvoltage limit branch road current sensor D3, for measuring circuit breaker ambient temperature sensor D4, height
The switch ends voltage sensor Vhss of fast mechanical switch, the voltage sensor for measuring transfer electric capacity both end voltage state
Vc, the switch displacement transducer Pd of high speed machine switch, signal conditioning circuit, high-speed AD, processor, human-computer interaction interface and logical
Believe module, the processor completes system power, the amplitude of the electric current of main current loop and electric current transfer branch current and change
Rate di/dt calculating, the human-computer interaction interface shows mixed type dc circuit breaker state and result of calculation in real time.
Under normal operating conditions, electric current flows through from the main current loop, and transfer electric capacity C is provided with predetermined pre-charge pressure
Value, and voltage direction and the conduction voltage drop of the main current loop are in opposite direction, in the electric current transfer branch road at IGCT VT1
In off state, when on-line monitoring system monitors straight-flow system abnormal state or receives separating brake instruction, the on-line monitoring
System sends separating brake instruction to high speed machine switch, and high speed machine starts action, triggers IGCT component VT1, completes electricity
Zero is flowed through to cut-off to realize.
In described mixed type dc circuit breaker, the high speed machine switch is opened for the high speed machine based on electromagnetic repulsion force
The mechanical switch close, driven based on high-speed electric expreess locomotive or the high speed machine switch based on explosion driving.
In described mixed type dc circuit breaker, the design parameter of the overvoltage limitation branch road includes voltage and limits electricity
When appearance of a street amount, conducting voltage threshold value, electric current when reaching conducting voltage, the spacing voltage of highest and voltage spacing in highest
Electric current.
In described mixed type dc circuit breaker, the overvoltage limitation branch road is located under breaker normal operation
In cut-off state, leakage current is less than 0.5 μ A；The conducting voltage threshold value of the overvoltage limitation branch road is residing for the breaker
1.75 times of system voltage.
In described mixed type dc circuit breaker, the overvoltage limitation branch road is lightning-arrest including line type metal oxide
Device, gapless Line type's MOA, all insulation polymeric metal oxide surge arrester or detachable lightning arrester
In any one or more combinations.
In described mixed type dc circuit breaker, overvoltage limitation branch road is piezo-resistance, zinc oxide valve plate composition
One or any number of combinations in MOV or arrester.
In described mixed type dc circuit breaker, system power, the electric current of the main current loop, electric current transfer branch road
Electric current, the overvoltage limitation branch current, high speed machine switching voltage, transfer capacitance voltage, high speed machine switch displacement
Numerical value device amplifies after filtering, calculated into the high-speed AD and processor processing, the processor calculates principal current
Loop current, the amplitude of transfer current branch current and rate of change di/dt, by the protection algorism and delays time to control of processor
Afterwards, high speed machine switch control is carried out, power semiconductor control, the human-computer interaction interface shows hybrid direct current in real time
Circuit-breaker status and all kinds of result of calculations, fault data pass host computer back in real time by communication module.
In described mixed type dc circuit breaker, the processor is general processor, digital signal processor, special
Integrated circuit ASIC or on-site programmable gate array FPGA.
In described mixed type dc circuit breaker, the processor includes memory, and the memory can include one
Individual or multiple read only memory ROMs, random access memory ram, flash memory or Electrical Erasable may be programmed read-only storage
Device EEPROM.
In another aspect of this invention, the disjunction side under a kind of short-circuit condition using described mixed type dc circuit breaker
Method comprises the following steps：
In the first step, on-line detecting system detects system power and reaches that given threshold or current-rising-rate reach
During given threshold, separating brake instruction is sent.
In the second step, there is operating lag in high speed machine switch, and electric current transfer branch road IGCT component VT1 is turned on,
Main current loop electric current starts to electric current transfer branch road transfer.
In third step, power diode VD1 reversely ends after main current loop current over-zero so that principal current is returned
Road electric current is maintained at zero, and now high speed machine switch is opened, and realizes that the transfer electric capacity in thick-less vane, electric current transfer branch road is reverse
Charging.
In four steps, as transfer electric capacity both end voltage is continuously increased, when electric current transfer branch voltage exceeded electricity
The threshold value of pressure limitation branch road, overvoltage limitation branch road conducting, electric current transfer branch current starts to overvoltage limitation branch road transfer.
In the 5th step, as transfer branch current is decreased to zero, the IGCT component VT1 of electric current transfer branch road is cut
Only, now system voltage is less than the conduction threshold that overvoltage limits branch road, and overvoltage limitation branch current is decreased to rapidly zero, complete
Into cut-offfing.
Described above is only the general introduction of technical solution of the present invention, in order to cause the technological means of the present invention clearer
Understand, reach the degree that those skilled in the art can be practiced according to the content of specification, and in order to allow the present invention
Above and other objects, features and advantages can become apparent, below with the present invention embodiment illustrated
Explanation.
Brief description of the drawings
By reading the detailed description in hereafter preferred embodiment, the present invention various other advantage and benefit
It will be clear understanding for those of ordinary skill in the art.Figure of description is only used for showing the purpose of preferred embodiment,
And it is not considered as limitation of the present invention.It should be evident that drawings discussed below is only some embodiments of the present invention,
For those of ordinary skill in the art, on the premise of not paying creative work, it can also be obtained according to these accompanying drawings
Other accompanying drawings.And in whole accompanying drawing, identical part is presented with like reference characters.
In the accompanying drawings：
Fig. 1 is the structural representation of the single-stage breaker module of mixed type dc circuit breaker according to an embodiment of the invention
Figure；
Fig. 2 is that the breaker module on-line monitoring system of mixed type dc circuit breaker according to an embodiment of the invention is passed
Sensor distribution schematic diagram；
Fig. 3 (a)-Fig. 3 (e) is that the breaker module of mixed type dc circuit breaker according to an embodiment of the invention is excessively electric
Press limiting circuit VA characteristic curve figure；
Fig. 4 is the breaker module cascaded structure signal of mixed type dc circuit breaker according to an embodiment of the invention
Figure；
Fig. 5 is the breaker master control block diagram of mixed type dc circuit breaker according to an embodiment of the invention；
Fig. 6 is the step of the method for dividing under the short circuit of utilization mixed type dc circuit breaker according to an embodiment of the invention
Rapid schematic diagram.
The present invention is further explained below in conjunction with drawings and examples.
Embodiment
The specific embodiment of the present invention is more fully described below with reference to accompanying drawings.Although showing the present invention's in accompanying drawing
Specific embodiment, it being understood, however, that may be realized in various forms the present invention without that should be limited by embodiments set forth here
System.Conversely it is able to be best understood from the present invention there is provided these embodiments, and can be complete by the scope of the present invention
Convey to those skilled in the art.
It should be noted that having used some vocabulary to censure specific components among specification and claim.Ability
Field technique personnel it would be appreciated that, technical staff may call same component with different nouns.This specification and right
It is required that not in the way of the difference of noun is used as differentiation component, but differentiation is used as with the difference of component functionally
Criterion."comprising" or " comprising " as mentioned in working as in specification in the whole text and claim are an open language, therefore should be solved
It is interpreted into " include but be not limited to ".Specification subsequent descriptions for implement the present invention better embodiment, so it is described description be with
For the purpose of the rule of specification, the scope of the present invention is not limited to.Protection scope of the present invention is when regarding appended right
It is required that defined person is defined.
For ease of the understanding to the embodiment of the present invention, done below in conjunction with accompanying drawing by taking several specific embodiments as an example further
Explanation, and each accompanying drawing does not constitute the restriction to the embodiment of the present invention.
Fig. 1 is the structural representation of the single-stage breaker module of the mixed type dc circuit breaker of one embodiment of the present of invention
Figure, the embodiment of the present invention will be specifically described with reference to Fig. 1.
As shown in figure 1, An embodiment provides a kind of mixed type dc circuit breaker, the mixed type direct current
Breaker is composed in series by n identical single-stage breaker modules, and wherein C1 to Cn+1 is n+1 single-stage breaker module
System access end, wherein the single-stage breaker module include main current loop, electric current transfer branch road, overvoltage limitation branch road,
Incoming end Ci, Ci+1 of on-line monitoring system and single-stage breaker module, wherein 1≤i≤n, and main current loop, transfer current
Branch road and overvoltage limitation branch circuit parallel connection.
The main current loop is composed in series by high speed machine switch and power diode VD1, wherein：
The positive pole of the incoming end Ci+1 connections power diode VD1 so as to realize the incoming end Ci+1 with it is described
The connection of the other end of main current loop；
One end of the incoming end Ci connections high speed machine switch is to realize the incoming end Ci and the main electricity
Flow back to the connection of road one end.
The electric current transfer branch road includes IGCT component VT1, vibration inductance L and transfer electric capacity C, wherein, thyristor groups
Part VT1 positive poles are connected with incoming end Ci, and IGCT component VT1 negative poles are connected with vibration inductance L, vibrate the inductance L other ends and turn
Move electric capacity C to be connected, the transfer electric capacity C other ends are connected with incoming end Ci+1, wherein the transfer electric capacity C poles being connected with incoming end
Post one end is positive charged.
Fig. 2 is that the breaker module on-line monitoring system of mixed type dc circuit breaker according to an embodiment of the invention is passed
Sensor distribution schematic diagram, referring to Fig. 2, on-line monitoring system includes being used to measure the electricity for flowing through incoming end Ci, Ci+1 electric current
Flow sensor D0, for measure flow through main current loop current sensor D1, for measure flow through electric current transfer branch road in electricity
The current sensor D2 on road, for measurement stream through overvoltage limit branch road current sensor D3, for measuring circuit breaker ambient
Temperature sensor D4, high speed machine switch switch ends voltage sensor Vhss, for measure transfer electric capacity both end voltage shape
Voltage sensor Vc, switch displacement transducer Pd, signal conditioning circuit, high-speed AD, processor, the people of high speed machine switch of state
Machine interactive interface and communication module, the processor complete system power, the electric current of main current loop and electric current transfer branch road electricity
The amplitude of stream and rate of change di/dt calculating, the human-computer interaction interface show mixed type dc circuit breaker state and meter in real time
Calculate result.
Under normal operating conditions, electric current flows through from the main current loop, and transfer electric capacity C is provided with predetermined pre-charge pressure
Value, and voltage direction and the conduction voltage drop of the main current loop are in opposite direction, in the electric current transfer branch road at IGCT VT1
In off state, when on-line monitoring system monitors straight-flow system abnormal state or receives separating brake instruction, the on-line monitoring
System sends separating brake instruction to high speed machine switch, and high speed machine starts action, triggers IGCT component VT1, completes electricity
Zero is flowed through to cut-off to realize.
In the preferred embodiment of the described mixed type dc circuit breaker of the present invention, the high speed machine switch is based on electricity
The high speed machine switch of magnetic repulsion, the mechanical switch driven based on high-speed electric expreess locomotive or the high speed machine switch based on explosion driving.
In the preferred embodiment of the described mixed type dc circuit breaker of the present invention, the overvoltage limits the design of branch road
Electric current, the spacing voltage of highest and place when parameter includes voltage limiting circuit capacity, conducting voltage threshold value, reaches conducting voltage
Electric current when highest spacing voltage.
In the preferred embodiment of the described mixed type dc circuit breaker of the present invention, the overvoltage limits branch road in open circuit
Cut-off state is under device normal operation, leakage current is less than 0.5 μ A；The overvoltage limits the conducting voltage threshold value of branch road
For 1.75 times of the system voltage residing for the breaker.
In the preferred embodiment of the described mixed type dc circuit breaker of the present invention, the overvoltage limitation branch road includes line
Road type metal oxide arrester, gapless Line type's MOA, all insulation composite sheath metal oxide are kept away
Any one or more combinations in thunder device or detachable lightning arrester.
In the preferred embodiment of the described mixed type dc circuit breaker of the present invention, overvoltage limitation branch road is pressure-sensitive electricity
One or any number of combinations in resistance, the MOV of zinc oxide valve plate composition or arrester.
In the preferred embodiment of the described mixed type dc circuit breaker of the present invention, system power, the main current loop
Electric current, electric current transfer branch road electric current, the overvoltage limitation branch current, high speed machine switching voltage, transfer electric capacity electricity
Pressure, the numerical value device amplification after filtering of high speed machine switch displacement, are calculated, institute into the high-speed AD and processor processing
State processor and calculate main current loop electric current, the amplitude of transfer current branch current and rate of change di/dt, by the guarantor of processor
Protect after algorithm and delays time to control, carry out high speed machine switch control, power semiconductor control, the human-computer interaction interface is real
When show hybrid dc circuit breaker state and all kinds of result of calculations, fault data passes host computer back in real time by communication module.
The present invention described mixed type dc circuit breaker preferred embodiment in, the processor be general processor,
Digital signal processor, application-specific integrated circuit ASIC or on-site programmable gate array FPGA.
In the preferred embodiment of the described mixed type dc circuit breaker of the present invention, the processor includes memory, institute
Stating memory can including one or more read only memory ROMs, random access memory ram, flash memory or electronics
Erasable programmable read-only memory (EPROM) EEPROM.
Fig. 3 (a)-Fig. 3 (e) is that the breaker module of mixed type dc circuit breaker according to an embodiment of the invention is excessively electric
Limiting circuit VA characteristic curve figure is pressed, shown in such as Fig. 3 (a)-Fig. 3 (e), breaker module disjunction short circuit current flow process is as follows.
1) such as Fig. 3 (a) major loops through-flow stage.Under normal operating conditions, main current loop electric current is from mechanical switch sections
Flow through, on-state loss is small.When main current loop short circuit, there is certain mechanical delay in high-speed mechanism, about 300 μ s add machine
There is certain dispersiveness in tool action, about 50 μ s, therefore high-speed mechanism should send the μ of μ s of actuating signal 250~350 in controller
S or so completes disjunction；
2) as shown in Fig. 3 (b), when major loop short circuit, control system sends separating brake instruction, and high speed machine starts to move
Make, because high speed machine switch has certain mechanical delay, about 300 μ s add mechanical action and there is certain dispersiveness,
About 50 μ s, therefore high speed machine switch is not opened immediately.Meanwhile, control system trigger current transfer branch road IGCT component
Conducting, main current loop electric current starts to electric current transfer branch road transfer；
3) as Fig. 3 (c) power diodes VD1 reversely ends after main circuit current zero passage so that main circuit current is kept
Zero, now high speed machine switch opening, realizes the transfer electric capacity reverse charging in thick-less vane, electric current transfer branch road；
4) as shown in Fig. 3 (d), as transfer electric capacity both end voltage is continuously increased, when transfer branch voltage exceedes overvoltage
The threshold value of branch road, overvoltage limitation branch road conducting are limited, transfer branch current starts to overvoltage limitation branch road transfer；
5) as shown in Fig. 3 (e), as transfer branch current is decreased to zero, the IGCT component VT1 of transfer branch road ends,
Now system voltage is less than the conduction threshold that overvoltage limits branch road, and overvoltage limitation branch current is decreased to rapidly zero, beginning
Complete.
Fig. 4 is the breaker module cascaded structure signal of mixed type dc circuit breaker according to an embodiment of the invention
Figure, as shown in figure 4, wherein C1-Cn+1 is the system access end of n+1 breaker module.For the ease of the company of breaker module
Connect, connected between breaker module by connecting valve, connecting valve can be including but not limited to for disconnecting switch, vacuum
Switch etc., the equipment for being connected as cascade process needs, is not belonging to scope, can improve mixed by breaker module series connection
The applied voltage grade of box-like dc circuit breaker, at the same it is easy to connect between each breaker module, can be according to real system
Voltage request adjustment breaker module series connection number.
Fig. 5 is the breaker master control block diagram of mixed type dc circuit breaker according to an embodiment of the invention, and Fig. 5 is provided
The design structure of breaker module control system of the present invention, the real-time breaker that control system processing on-line monitoring system is returned
And system state data, mainly including signal conditioning circuit, high-speed AD, processor and human-computer interaction interface and host computer communication system
System.The electric current of the system power, the main current circuit, electric current shifts the electric current of branch road, the overvoltage limiting circuit electricity
Stream, high speed machine switching voltage, transfer capacitance voltage, the numerical value of high speed machine switch displacement amplify after filtering, at AD
Reason is calculated, and described calculate includes but is not limited to main current circuit electric current, the amplitude and rate of change di/dt of transfer current branch current
Calculating, after the protection algorism and delays time to control of processor, carry out high speed machine switch control, power semiconductor control
System, the human-computer interaction interface shows hybrid dc circuit breaker state and all kinds of result of calculations in real time, and fault data passes through logical
Letter system passes host computer back in real time.Further, the control system be able to can also be integrated in described independently into independent assembly
In on-line monitoring system.
Fig. 6 is the step of the method for dividing under the short circuit of utilization mixed type dc circuit breaker according to an embodiment of the invention
A kind of method for dividing under rapid schematic diagram, short-circuit condition using described mixed type dc circuit breaker comprises the following steps：
In first step S1, on-line detecting system detects system power and reaches that given threshold or current-rising-rate reach
During to given threshold, separating brake instruction is sent.
In second step S2, there is operating lag in high speed machine switch, and electric current transfer branch road IGCT component VT1 is led
Logical, main current loop electric current starts to electric current transfer branch road transfer.
In third step S3, power diode VD1 reversely ends after main current loop current over-zero so that principal current
Loop current is maintained at zero, and now high speed machine switch is opened, and realizes that the transfer electric capacity in thick-less vane, electric current transfer branch road is anti-
To charging.
In the fourth step s 4, as transfer electric capacity both end voltage is continuously increased, when electric current transfer branch voltage exceeded
Voltage limits the threshold value of branch road, and overvoltage limitation branch road conducting, electric current transfer branch current starts to turn to overvoltage limitation branch road
Move.
In the 5th step S5, as transfer branch current is decreased to zero, the IGCT component VT1 of electric current transfer branch road is cut
Only, now system voltage is less than the conduction threshold that overvoltage limits branch road, and overvoltage limitation branch current is decreased to rapidly zero, complete
Into cut-offfing.
High pressure mixing formula dc circuit breaker disclosed by the invention includes multiple breaker modules, and the breaker module includes
Main current loop, electric current transfer branch road, overvoltage limitation branch road and on-line detecting system.Transfer current branch road includes precharge
Capacitor, inductance and power semiconductor, by the series connection of hybrid circuit breaker module, can not only improve applied voltage
Grade, at the same it is easy to connect between each breaker module, breaker module string can be adjusted according to real system voltage request
Join number.The breaker that the present invention is included can not only realize the short circuit breaking under the application such as high voltage, and can pass through control
Part breaker module processed carries out separating brake and acts the short-circuit current-limiting function realized in the case of voltage levels.
Although embodiment of the present invention is described above in association with accompanying drawing, the invention is not limited in above-mentioned
Specific embodiments and applications field, above-mentioned specific embodiment is only schematical, guiding, rather than restricted
's.One of ordinary skill in the art is under the enlightenment of this specification and is not departing from the scope that the claims in the present invention are protected
In the case of, the form of many kinds can also be made, these belong to the row of protection of the invention.
Claims (10)
1. a kind of mixed type dc circuit breaker, the mixed type dc circuit breaker is by n identical single-stage breaker modules
It is composed in series, wherein C1 to Cn+1 is n+1 single-stage breaker module system access end, wherein the single-stage breaker module bag
Main current loop is included, electric current transfer branch road, overvoltage limit the incoming end of branch road, on-line monitoring system and single-stage breaker module
Ci, Ci+1, wherein 1≤i≤n, and main current loop, transfer current branch road and overvoltage limit branch circuit parallel connection, its feature exists
In：
(1) main current loop is composed in series by high speed machine switch and power diode VD1, wherein：
The positive pole of the incoming end Ci+1 connections power diode VD1 is to realize the incoming end Ci+1 and the main electricity
Flow back to the connection of the other end on road；
One end of the incoming end Ci connections high speed machine switch is to realize that the incoming end Ci is returned with the principal current
The connection of road one end；
(2) the electric current transfer branch road includes IGCT component VT1, vibration inductance L and transfer electric capacity C, wherein, IGCT component
VT1 positive poles are connected with incoming end Ci, and IGCT component VT1 negative poles are connected with vibration inductance L, the vibration inductance L other ends and transfer
Electric capacity C is connected, and the transfer electric capacity C other ends are connected with incoming end Ci+1, wherein the transfer electric capacity C poles being connected with incoming end
One end is positive charged；
(3) on-line monitoring system includes being used to measure flowing through the current sensor D0 of incoming end Ci, Ci+1 electric current, for surveying
Amount flow through main current loop current sensor D1, for measure flow through electric current transfer branch road in circuit current sensor D2,
For measurement stream the current sensor D3 of branch road is limited through overvoltage, for measuring circuit breaker ambient temperature sensor D4, high speed
The switch ends voltage sensor Vhss of mechanical switch, for measure transfer electric capacity both end voltage state voltage sensor Vc,
Switch displacement transducer Pd, signal conditioning circuit, high-speed AD, processor, human-computer interaction interface and the communication of high speed machine switch
Module, the processor completes the amplitude and rate of change of system power, the electric current of main current loop and electric current transfer branch current
Di/dt calculating, the human-computer interaction interface shows mixed type dc circuit breaker state and result of calculation in real time；
Under normal operating conditions, electric current flows through from the main current loop, and transfer electric capacity C is provided with predetermined precharging voltage value, and
Voltage direction and the conduction voltage drop of the main current loop are in opposite direction, and IGCT VT1, which is in, in the electric current transfer branch road closes
Disconnected state, when on-line monitoring system monitors straight-flow system abnormal state or receives separating brake instruction, the on-line monitoring system
Separating brake instruction is sent to high speed machine switch, high speed machine starts action, triggers IGCT component VT1, completes electric current mistake
Zero is cut-off with realizing.
2. mixed type dc circuit breaker according to claim 1, it is characterised in that：It is preferred that, the high speed machine switch
The mechanical switch driven for the high speed machine switch based on electromagnetic repulsion force, based on high-speed electric expreess locomotive or the high speed machine based on explosion driving
Tool is switched.
3. mixed type dc circuit breaker according to claim 1, it is characterised in that：The overvoltage limits the design of branch road
Electric current, the spacing voltage of highest and place when parameter includes voltage limiting circuit capacity, conducting voltage threshold value, reaches conducting voltage
Electric current when highest spacing voltage.
4. mixed type dc circuit breaker according to claim 1, it is characterised in that：The overvoltage limits branch road in open circuit
Cut-off state is under device normal operation, leakage current is less than 0.5 μ A；The overvoltage limits the conducting voltage threshold value of branch road
For 1.75 times of the system voltage residing for the breaker.
5. mixed type dc circuit breaker according to claim 1, it is characterised in that：The overvoltage limitation branch road includes line
Road type metal oxide arrester, gapless Line type's MOA, all insulation composite sheath metal oxide are kept away
Any one or more combinations in thunder device or detachable lightning arrester.
6. mixed type dc circuit breaker according to claim 1, it is characterised in that：Overvoltage limitation branch road is pressure-sensitive electricity
One or any number of combinations in resistance, the MOV of zinc oxide valve plate composition or arrester.
7. mixed type dc circuit breaker according to claim 1, it is characterised in that：System power, the main current loop
Electric current, electric current transfer branch road electric current, the overvoltage limitation branch current, high speed machine switching voltage, transfer electric capacity electricity
Pressure, the numerical value device amplification after filtering of high speed machine switch displacement, are calculated, institute into the high-speed AD and processor processing
State processor and calculate main current loop electric current, the amplitude of transfer current branch current and rate of change di/dt, by the guarantor of processor
Protect after algorithm and delays time to control, carry out high speed machine switch control, power semiconductor control, the human-computer interaction interface is real
When show hybrid dc circuit breaker state and all kinds of result of calculations, fault data passes host computer back in real time by communication module.
8. mixed type dc circuit breaker according to claim 1, it is characterised in that：The processor be general processor,
Digital signal processor, application-specific integrated circuit ASIC or on-site programmable gate array FPGA.
9. mixed type dc circuit breaker according to claim 1, it is characterised in that：The processor includes memory, institute
Stating memory can including one or more read only memory ROMs, random access memory ram, flash memory or electronics
Erasable programmable read-only memory (EPROM) EEPROM.
10. the method for dividing under a kind of short-circuit condition of the mixed type dc circuit breaker described in utilization claim any one of 1-9,
It comprises the following steps：
In first step (S1), on-line detecting system detects system power and reaches that given threshold or current-rising-rate reach
During given threshold, separating brake instruction is sent；
In second step (S2), there is operating lag in high speed machine switch, and electric current transfer branch road IGCT component VT1 is turned on,
Main current loop electric current starts to electric current transfer branch road transfer；
In third step (S3), power diode VD1 reversely ends after main current loop current over-zero so that principal current is returned
Road electric current is maintained at zero, and now high speed machine switch is opened, and realizes that the transfer electric capacity in thick-less vane, electric current transfer branch road is reverse
Charging；
In four steps (S4), as transfer electric capacity both end voltage is continuously increased, when electric current transfer branch voltage exceeded electricity
The threshold value of pressure limitation branch road, overvoltage limitation branch road conducting, electric current transfer branch current starts to overvoltage limitation branch road transfer；
In the 5th step (S5), as transfer branch current is decreased to zero, the IGCT component VT1 of electric current transfer branch road is cut
Only, now system voltage is less than the conduction threshold that overvoltage limits branch road, and overvoltage limitation branch current is decreased to rapidly zero, complete
Into cut-offfing.
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| CN107947106A (en) * | 2017-11-27 | 2018-04-20 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七二研究所） | A kind of direct current cutting system major loop topological structure |
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| CN111711163A (en) * | 2020-06-29 | 2020-09-25 | 西安西电开关电气有限公司 | Direct current breaker and control method thereof |
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