CN108565845A - A kind of dc circuit breaker, control system and method for disjunction fault current - Google Patents
A kind of dc circuit breaker, control system and method for disjunction fault current Download PDFInfo
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- CN108565845A CN108565845A CN201810673926.5A CN201810673926A CN108565845A CN 108565845 A CN108565845 A CN 108565845A CN 201810673926 A CN201810673926 A CN 201810673926A CN 108565845 A CN108565845 A CN 108565845A
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- 239000004065 semiconductor Substances 0.000 claims description 102
- 230000009471 action Effects 0.000 claims description 13
- 230000005611 electricity Effects 0.000 claims description 8
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- 230000008859 change Effects 0.000 claims description 5
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 4
- 239000004020 conductor Substances 0.000 claims description 3
- 230000003139 buffering effect Effects 0.000 claims description 2
- 238000010891 electric arc Methods 0.000 claims description 2
- 238000004880 explosion Methods 0.000 claims description 2
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- 230000003137 locomotive effect Effects 0.000 claims description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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Abstract
The invention discloses a kind of dc circuit breakers for disjunction fault current, including main current circuit and transfer current circuit, main current circuit to be connected with transfer current circuit in parallel.Main current circuit includes one or more high speed machine switches being connected in series with, and transfer current circuit includes magnetic coupling shift module and solid-state switching circuits, and magnetic coupling shift module and solid-state switching circuits are connected in series with.The invention also discloses a kind of control systems and method for disjunction fault current.The present invention can realize the quick disjunction to electric current, the volume and manufacturing cost for effectively reducing breaker, the fast transfer of electric current is realized using magnetic coupling shift module, and realizes the isolation of recharging circuit and major loop, transfer velocity is fast, and reliable breaking is high.Meanwhile it using freewheeling circuit and high speed machine switch in parallel, avoiding breaker and having cut-off fracture disjunction failure caused by repeated breakdown, further improving the reliability of disjunction.
Description
Technical field
The invention belongs to technical field of electric equipment, and in particular to a kind of dc circuit breaker for disjunction fault current,
Control system and method.
Background technology
The hybrid circuit-breaker being made of with power semiconductor high speed machine switch is big with discharge capacity, turns off speed
The advantages that degree is fast, current limiting capacity is strong, has become the research hotspot that hicap cut-offs field.Using with full control function
The hybrid dc circuit breaker scheme of power semiconductor breaking current has breaking speed compared to other hybrid schemes
Faster, more conducively disjunction rated current the advantages of.But when using full-control type power semiconductor breaking current, it usually needs
Full-control type power semiconductor is connected with mechanical switch realizes electric current transfer, and specified through-flow loss is high, constrain its promote with
Using.
After the completion of disjunction, mechanical switch needs to be resistant to shutdown voltage Traditional DC breaker, due to mechanical breaker medium
Dielectric strength restores insufficient, is easy to happen repeated breakdown and disjunction is caused to fail.
Capacitator charging circuit in traditional transfer current circuit is connected directly with major loop, is not isolated, was cut-off
Journey charge power supply and major loop can interfere, and very high for the resistance to pressure request of major loop charge power supply, and cut-offfing can not
It leans on.
Invention content
In view of the deficiency of the prior art, the present invention proposes a kind of direct current interruption for disjunction fault current
Device, control system and method.
The present invention is in order to solve the above technical problems, adopt the following technical scheme that：A kind of direct current for disjunction fault current
Breaker, the breaker include main current circuit and transfer current circuit, and the main current circuit and transfer current circuit are simultaneously
Connection connection.The main current circuit includes one or more high speed machine switches being connected in series with.The transfer current circuit packet
Magnetic coupling shift module and solid-state switching circuits are included, the magnetic coupling shift module and solid-state switching circuits are connected in series with, described
Solid-state switching circuits include one or more bridge-type solid-state switches being connected in series with.
The invention also provides a kind of control systems for disjunction fault current, and the system comprises controllers and direct current
Breaker, the controller are connect with dc circuit breaker, when action for determining the dc circuit breaker disjunction fault current
Sequence simultaneously controls the action that the dc circuit breaker carries out disjunction fault current.
The invention also provides a kind of control methods for disjunction fault current, and the method is as follows, and straight-flow system is just
Under normal working condition, electric current is flowed through from main current circuit, and the primary side capacitance (C1) in magnetic coupling shift module keeps precharge shape
State, transfer current circuit do not have electric current to pass through；
When short trouble, which occurs, for straight-flow system needs to carry out disjunction, controller controls the high speed in the main current circuit
Mechanical switch carries out separating brake action, and when separating brake action is made, high speed machine switch and contact pass through control still in closed state
Device processed measures the current amplitude and change rate of main current circuit, and according to each in transfer current circuit described in preset timing control
Whether power semiconductor acts and acts accordingly.
The present invention is using advantageous effect caused by technical solution as above：The present invention can realize quickly dividing to electric current
Disconnected, main current circuit undertakes rated current, and no on-state loss is not necessarily to cooling measure.Electric current is realized using magnetic coupling shift module
Fast transfer realizes the isolation of recharging circuit and major loop, and transfer velocity is fast, and reliable breaking is high.It is partly led using bridge-type
Body structure realizes the two-way disjunction of electric current, and full-control type power semiconductor quantity is few, greatly reduces the cost of breaker.Using
Freewheeling circuit and high speed machine switch in parallel avoid having cut-off fracture repeated breakdown and disjunction are caused to fail, improve reliable breaking.
Description of the drawings
Fig. 1 is dc circuit breaker body construction schematic diagram of the present invention；
A kind of structural schematic diagram when Fig. 2 is dc circuit breaker work of the present invention；
Transfer current circuital current mark schematic diagram when Fig. 3 is breaking current；
The current flow diagrams of main current circuit when Fig. 4 system normal operations；
The current branch current flow diagrams at transfer current circuit t0-t1 moment when Fig. 5 is breaking current；
The current branch current flow diagrams at transfer current circuit t2 moment when Fig. 6 is breaking current；
The current branch current flow diagrams at transfer current circuit t3 moment when Fig. 7 is breaking current；
The current branch current flow diagrams at transfer current circuit t4-t6 moment when Fig. 8 is breaking current；
Curent change curve graph when Fig. 9 is breaking current in each current branch circuit；
Figure 10 to Figure 18 be the present invention in solid-state switching circuits and magnetic coupling shift module using specific device IGBT,
The devices such as IGCT, IEGT, thyristor, diode are as the connection types such as power semiconductor or freewheeling circuit, buffer circuit
Each specific implementation structure or combination schematic diagram；
Figure 19 to Figure 21 is the different schematic diagrames for implementing structure or combination that buffer circuit uses in the present invention.
Specific implementation mode
The present invention will be described in detail for 1-21 and embodiment below in conjunction with the accompanying drawings, but not as a limitation of the invention.
As shown in Figure 1, a kind of dc circuit breaker for disjunction fault current provided by the invention, including main current circuit
With transfer current circuit.In order to better illustrate breaker breaking course, this gives dc circuit breaker electric currents from a left side
The structural schematic diagram flowed to the right, as shown in Figure 2.
As shown in Figure 1 and Figure 2, dc circuit breaker includes main current circuit and transfer current circuit, main current circuit and transfer
Current circuit is in parallel.
Main current circuit includes one or more high speed machine switches being connected in series with.To prevent high speed machine switching current
Puncture after transfer, main current circuit further includes switching the freewheeling circuit being in parallel with the high speed machine.Freewheeling circuit is used
In providing afterflow, puncture after preventing high speed machine switching current from shifting.
Transfer current circuit includes magnetic coupling shift module and solid-state switching circuits, the magnetic coupling shift module and solid-state
Switching circuit in series connects.Solid-state switching circuits include one or more bridge-type solid-state switches being connected in series with.
Wherein, bridge-type solid-state switch is by the first power semiconductor A1, the second power semiconductor A2, third power
Semiconductor devices A3, the 4th power semiconductor A4, the 5th power semiconductor A5, buffer circuit A6 and energy consuming circuitry A7
Composition.The connection type of bridge-type solid-state switch is：The first power semiconductor A1 and the second power semiconductor A2
Series connection, the third power semiconductor A3 connect with the 4th power semiconductor A4, the first power semiconductor device
There is first end point, the third power semiconductor A3 and the 4th power between part A1 and the second power semiconductor A2
There is the second endpoint between semiconductor devices A4, the first power semiconductor A1 and third power semiconductor A3 it
Between have third endpoint, between the second power semiconductor A2 and the 4th power semiconductor A4 have the 4th end
Point, the 5th power semiconductor A5 are connected between first end point and the second endpoint, and the buffer circuit A6 is connected to
Between first end point and the second endpoint, energy consuming circuitry A7 is connected between third endpoint and the 4th endpoint, alternatively, the buffering is electric
Road A6 is connected between third endpoint and the 4th endpoint, and energy consuming circuitry A7 is connected between first end point and the second endpoint.
Magnetic coupling shift module includes primary circuit and secondary circuit.Wherein, primary circuit is by primary inductor L 1, primary side electricity
Hold C1, the first power semiconductor B1, the second power semiconductor B2, third power semiconductor B3 and the 4th power
Semiconductor devices B4 compositions.Secondary circuit is made of the secondary inductance L2 being connected in transfer current circuit.The primary side inductance
Composition mutual inductor is coupled with secondary inductance.The connection type of primary circuit is：The first power semiconductor B1 and second
Power semiconductor B2 series connection, the third power semiconductor B3 connects with the 4th power semiconductor B4, described
There is the 5th endpoint, the third power half between first power semiconductor B1 and the second power semiconductor B2
There is the 6th endpoint, the first power semiconductor B1 between conductor device B3 and the 4th power semiconductor B4
There is the 7th endpoint, the second power semiconductor B2 and the described 4th between the third power semiconductor B3
There is the 8th endpoint, the primary side capacitance C1 to be connected to the 5th endpoint and the 6th end between power semiconductor B4
Between point, the primary inductor L 1 is connected between the 7th endpoint and the 8th endpoint.
In a preferred embodiment, as shown in figure 11, the freewheeling circuit is by two power semiconductor inverse parallels
It connects and composes, punctures for providing after afterflow prevents high speed machine switching current from shifting.
In a preferred embodiment, the first power semiconductor A1, the second power semiconductor A2, third
Power semiconductor A3, the 4th power semiconductor A4 are that uncontrollable or with half control function one-way conduction power is partly led
In body device or combinations thereof, including but not limited to Power Diode Pumped, thyristor, IGCT, IGBT and GTO any one or it is arbitrary
Multiple combinations.The 5th power semiconductor A5 is the all-controlling power electronics device with switch off current ability, packet
It includes but is not limited to any one in IGCT, IGBT, IEGT and GTO or any number of combinations.
In a preferred embodiment, the high speed machine switch is switched or is based on for the high speed machine based on electromagnetic repulsion force
The mechanical switch of high-speed electric expreess locomotive driving or the high speed machine based on explosion driving switch.
In a preferred embodiment, the primary inductor L 1 is connected in series or in parallel by one or more inductance, described
Inductance is air-core inductor or the inductor containing magnetic core.The secondary inductance L2 is by one or more inductance serial or parallel connection groups
At the inductance is air-core inductor or the inductor containing magnetic core.
In a preferred embodiment, as shown in Figure 19 to Figure 21, the buffer circuit A6 is by capacitance C, resistance R or power
One or more of semiconductor devices D is composed, and the power semiconductor D is uncontrollable or with half control function
One-way conduction power semiconductor.
In a preferred embodiment, the energy consuming circuitry A7 is composed of one or more arresters, described lightning-arrest
Device is the arrester being made of varistor or zinc oxide valve plate.
A kind of control system for disjunction fault current provided by the invention, including controller and dc circuit breaker, institute
It states controller to connect with dc circuit breaker, the action sequence for determining the dc circuit breaker disjunction fault current simultaneously controls institute
State the action that dc circuit breaker carries out disjunction fault current.
A kind of control method for disjunction fault current provided by the invention, transfer electricity when Fig. 3 shows breaking current
The mark of each branch current of current circuit, wherein i1 are the electric current for flowing through main current circuit, and i2 is the electricity for flowing through transfer current circuit
Stream, i3 is the electric current for flowing through A5, and i4 is the electric current for flowing through buffer circuit A6, and i5 is the electric current for flowing through energy consuming circuitry A7.Fig. 4 extremely schemes
Each branch current direction in 8 transfer current circuits when showing breaking current, it is specific each for the corresponding moment each from t0 to t6
Branch current direction.Fig. 9 shows the curent change curve of each branch when breaking current.
Specifically, with reference to shown in Fig. 4 to Fig. 8, a kind of control method for disjunction fault current provided by the invention is such as
Under：
Under straight-flow system normal operating conditions, electric current is flowed through from main current circuit, the primary side electricity in magnetic coupling shift module
Holding (C1) keeps pre-charge state, transfer current circuit not to have electric current to pass through；
When short trouble, which occurs, for straight-flow system needs to carry out disjunction, controller controls the high speed in the main current circuit
Mechanical switch carries out separating brake action, and when separating brake action is made, high speed machine switch and contact pass through control still in closed state
Device processed measures the current amplitude and change rate of main current circuit, and according to each in transfer current circuit described in preset timing control
Whether power semiconductor acts and acts accordingly.It is as follows：
Short trouble occurs for t0 moment, straight-flow system, and main current circuit electric current is begun to ramp up, when more than system short-circuit threshold value
When, controller work, control high speed machine switch separating brake acts, and electric arc is generated between the contact of high speed machine switch.
The first power semiconductor B1 and the 4th power in magnetic coupling shift module is connected in t1 moment, controller control
The 5th power semiconductor A5 in semiconductor devices B4 and solid-state switching circuits, the transfer current circuit turn-on, magnetic coupling
Shift module conducting is closed, primary side capacitance C1 starts to discharge, and coupling inductance makes the both ends secondary inductance L2 in transfer current circuit
Induced voltage is generated, the electric current for flowing through main current circuit is shifted to transfer current circuit.
The electric current at t2 moment, main current circuit is fully transferred to transfer current circuit, and transfer current circuit bears all short
Road electric current, and short circuit current is gradually increasing.
The t3 moment, when dielectric insulation is restored to tolerance system overvoltage enough, controller between the contact of high speed machine switch
The 5th power semiconductor A5 shutdowns in solid-state switching circuits are controlled, electric current is shifted to buffer circuit A6.
T4 moment, buffer circuit voltage are more than the on state threshold voltage of energy consuming circuitry A7, and energy consuming circuitry is connected, and electric current starts
It is shifted to energy consuming circuitry.
T5 moment, electric current are fully transferred to energy consuming circuitry A7, and the voltage at breaker both ends reaches peak at this time, to cut-off
The overvoltage peak value at breaker both ends in the process.Hereafter, the electric current in energy consuming circuitry is begun to decline, the voltage at breaker both ends
Start slowly to decline, when system power is less than the minimum conducting electric current of energy consuming circuitry, energy consuming circuitry is closed, energy consuming circuitry both ends
Voltage declines rapidly.
At the t6 moment, the electric current in energy consuming circuitry A7 is zero, and breaker cut-offs completion, and the voltage at breaker both ends is reduced to system
Voltage.
In a preferred embodiment, the energy consuming circuitry A7 is in cut-off state under breaker normal operation,
Leakage current is less than lmA, and 1.5 that the conducting voltage threshold value of the energy consuming circuitry A7 is the system voltage residing for the breaker
Times.
Figure 10 to Figure 18 be the present invention in solid-state switching circuits and magnetic coupling shift module using specific device IGBT,
The devices such as IGCT, IEGT, thyristor, diode are as the connection types such as power semiconductor or freewheeling circuit, buffer circuit
Each specific implementation structure schematic diagram.
Figure 19 to Figure 21 is the different schematic diagrames for implementing structure or combination that buffer circuit uses in the present invention.
In addition to above-mentioned situation as shown in the figure, present invention does not require the circuit in breaker is full symmetric.
The present invention is when breaker needs drop-out current, by the power for controlling main current circuit and transfer current circuit
Semiconductor devices is acted by certain sequential, and transfer current circuit is connected, by the way that open circuit is isolated in triggering magnetic coupling shift module electric discharge
Device major loop and recharging circuit, can significantly improve the reliability cut-off.Meanwhile the present invention is using mutual inductor, primary side
The magnetic coupling shift module of capacitance (recharged capacitance) and power semiconductor composition, reduces transfer current circuit to capacitance
The demand of device capacity effectively reduces the volume of capacitance in transfer current circuit, and the original in magnetic coupling shift module circuit
Side capacitance pre-charge voltage is very low, also ensures that recharging circuit and breaker main current circuit and transfer current circuit are effective
Electric isolution, improve the reliability cut-off.Using freewheeling circuit and high speed machine switch in parallel, avoid having cut-off fracture bang
It wears and disjunction is caused to fail, improve reliable breaking.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Embodiments of the present invention are only limitted to this, for those of ordinary skill in the art to which the present invention belongs, are not departing from this
Under the premise of inventive concept, several simple deduction or replace can also be made, all shall be regarded as belonging to what the present invention was submitted
Protection domain determined by claims.
Claims (10)
1. a kind of dc circuit breaker for disjunction fault current, which is characterized in that
The breaker includes main current circuit and transfer current circuit；The main current circuit and transfer current circuit in parallel connect
It connects；
The main current circuit includes one or more high speed machine switches being connected in series with；
The transfer current circuit includes magnetic coupling shift module and solid-state switching circuits, the magnetic coupling shift module and solid-state
Switching circuit in series connects；
The solid-state switching circuits include one or more bridge-type solid-state switches being connected in series with.
2. dc circuit breaker according to claim 1, which is characterized in that it is preferred,
The bridge-type solid-state switch is by the first power semiconductor (A1), the second power semiconductor (A2), third power
Semiconductor devices (A3), the 4th power semiconductor (A4), the 5th power semiconductor (A5), buffer circuit (A6) and consumption
It can circuit (A7) composition；
First power semiconductor (A1) is connected with the second power semiconductor (A2), the third power semiconductor
Device (A3) is connected with the 4th power semiconductor (A4)；First power semiconductor (A1) is partly led with the second power
There is first end point between body device (A2)；The third power semiconductor (A3) and the 4th power semiconductor (A4)
Between have the second endpoint；Have the between first power semiconductor (A1) and third power semiconductor (A3)
Three endpoints；There is the 4th endpoint between second power semiconductor (A2) and the 4th power semiconductor (A4)；Institute
The 5th power semiconductor (A5) is stated to be connected between first end point and the second endpoint；The buffer circuit (A6) is connected to
Between end point and the second endpoint, energy consuming circuitry (A7) is connected between third endpoint and the 4th endpoint；Alternatively, the buffering electricity
(A6) is connected between third endpoint and the 4th endpoint on road, and energy consuming circuitry (A7) is connected between first end point and the second endpoint.
3. dc circuit breaker according to claim 1, which is characterized in that
The magnetic coupling shift module includes primary circuit and secondary circuit；
The primary circuit is by primary side inductance (L1), primary side capacitance (C1), the first power semiconductor (B1), the second power half
Conductor device (B2), third power semiconductor (B3) and the 4th power semiconductor (B4) composition；
The secondary circuit is made of the secondary inductance (L2) being connected in transfer current circuit；
The primary side inductance and secondary inductance coupling composition mutual inductor；
First power semiconductor (B1) is connected with the second power semiconductor (B2), the third power semiconductor
Device (B3) is connected with the 4th power semiconductor (B4)；First power semiconductor (B1) and second power
There is the 5th endpoint between semiconductor devices (B2)；The third power semiconductor (B3) and the 4th power semiconductor
There is the 6th endpoint between device (B4)；First power semiconductor (B1) and the third power semiconductor
(B3) there is the 7th endpoint between；Second power semiconductor (B2) and the 4th power semiconductor (B4) it
Between have the 8th endpoint；The primary side capacitance (C1) is connected between the 5th endpoint and the 6th endpoint；The primary side
Inductance (L1) is connected between the 7th endpoint and the 8th endpoint.
4. dc circuit breaker according to claim 1, which is characterized in that
The main current circuit further includes switching the freewheeling circuit being in parallel with the high speed machine；The freewheeling circuit is for carrying
For afterflow, puncture after preventing high speed machine switching current from shifting.
5. dc circuit breaker according to claim 2, which is characterized in that
First power semiconductor (A1), the second power semiconductor (A2), third power semiconductor (A3),
4th power semiconductor (A4) is uncontrollable or one-way conduction power semiconductor or combinations thereof with half control function,
Any one or any number of combinations including but not limited in Power Diode Pumped, thyristor；5th power semiconductor
Device (A5) be the all-controlling power electronics device with switch off current ability, including but not limited to IGCT, IGBT, IEGT and
Any one in GTO or any number of combinations；
The buffer circuit (A6) by one or more of capacitance (C), resistance (R) or power semiconductor (D) combine and
At the power semiconductor (D) is uncontrollable or with half control function one-way conduction power semiconductor；
The energy consuming circuitry (A7) is composed of one or more arresters；The arrester is by varistor or zinc oxide
The arrester of valve block composition.
6. dc circuit breaker according to claim 3, which is characterized in that
The high speed machine switch is the high speed machine switch based on electromagnetic repulsion force or the mechanical switch based on high-speed electric expreess locomotive driving
Or the high speed machine switch based on explosion driving；
The primary side inductance (L1) is connected in series or in parallel by one or more inductance, and the inductance is air-core inductor or contains magnetic
The inductor of core；The secondary inductance (L2) is connected in series or in parallel by one or more inductance, and the inductance is air core inductor
Device or inductor containing magnetic core.
7. a kind of control system for disjunction fault current, which is characterized in that
The system comprises any dc circuit breaker of controller and claim 1 to 6, the controller and direct current interruption
Device connects, and action sequence for determining the dc circuit breaker disjunction fault current simultaneously controls the dc circuit breaker and divided
The action of disconnected fault current.
8. a kind of control method for disjunction fault current, which is characterized in that the method is as follows：
Under straight-flow system normal operating conditions, electric current is flowed through from main current circuit, the primary side capacitance in magnetic coupling shift module
(C1) pre-charge state, transfer current circuit is kept not to have electric current to pass through；
When short trouble, which occurs, for straight-flow system needs to carry out disjunction, controller controls the high speed machine in the main current circuit
Switch carries out separating brake action, and when separating brake action is made, high speed machine switch and contact pass through controller still in closed state
The current amplitude and change rate of main current circuit are measured, and according to each power in transfer current circuit described in preset timing control
Whether semiconductor devices acts and acts accordingly.
9. the control method of disjunction fault current according to claim 8, which is characterized in that when short circuit occurs for straight-flow system
When failure is cut-off, the controller control main current circuit and transfer current circuit operation are as follows：
Short trouble occurs for t0 moment, straight-flow system, and main current circuit electric current is begun to ramp up, when more than system short-circuit threshold value,
Controller works, control high speed machine switch separating brake action, and electric arc is generated between the contact of high speed machine switch；
The first power semiconductor (B1) and the 4th power half in magnetic coupling shift module is connected in t1 moment, controller control
The 5th power semiconductor (A5) in conductor device (B4) and solid-state switching circuits, the transfer current circuit turn-on, magnetic
Shift module conducting is coupled, primary side capacitance (C1) starts to discharge, and coupling inductance makes the secondary inductance in transfer current circuit
(L2) both ends generate induced voltage, and the electric current for flowing through main current circuit is shifted to transfer current circuit；
The electric current at t2 moment, main current circuit is fully transferred to transfer current circuit, and transfer current circuit bears all short circuit electricity
Stream, and short circuit current is gradually increasing；
The t3 moment, when dielectric insulation is restored to tolerance system overvoltage enough, controller control between the contact of high speed machine switch
The 5th power semiconductor (A5) shutdown in solid-state switching circuits, electric current are shifted to buffer circuit (A6)；
The t4 moment, buffer circuit voltage be more than energy consuming circuitry (A7) on state threshold voltage, energy consuming circuitry conducting, electric current start to
Energy consuming circuitry shifts；
T5 moment, electric current are fully transferred to energy consuming circuitry (A7), and the voltage at breaker both ends reaches peak at this time, to cut-off
The overvoltage peak value at breaker both ends in journey；Hereafter, the electric current in energy consuming circuitry is begun to decline, and the voltage at breaker both ends is also opened
Begin slowly to decline, when system power is less than the minimum conducting electric current of energy consuming circuitry, energy consuming circuitry is closed, energy consuming circuitry both ends electricity
Pressure is rapid to be declined；
At the t6 moment, the electric current in energy consuming circuitry (A7) is zero, and breaker cut-offs completion, and the voltage at breaker both ends is reduced to system electricity
Pressure.
10. the control method of disjunction fault current according to claim 9, which is characterized in that
The energy consuming circuitry (A7) is in cut-off state under breaker normal operation, and leakage current is less than 1mA, and the consumption
The conducting voltage threshold value of energy circuit (A7) is 1.5 times of the system voltage residing for the breaker.
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| CN201810673926.5A CN108565845A (en) | 2018-06-26 | 2018-06-26 | A kind of dc circuit breaker, control system and method for disjunction fault current |
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| CN201810673926.5A CN108565845A (en) | 2018-06-26 | 2018-06-26 | A kind of dc circuit breaker, control system and method for disjunction fault current |
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| CN109347077A (en) * | 2018-11-06 | 2019-02-15 | 西安交通大学 | A kind of electric current bidirectional high-pressure direct current transportation net fault current controllers |
| CN109713651A (en) * | 2018-12-24 | 2019-05-03 | 西安交通大学 | A kind of dc circuit breaker and its cutoff method of two-way disjunction |
| CN110311360A (en) * | 2019-07-03 | 2019-10-08 | 南京南瑞继保电气有限公司 | Direct current break-up device and direct current method for dividing |
| CN110739167A (en) * | 2019-05-10 | 2020-01-31 | 许继集团有限公司 | DC switch equipment |
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