CN109861183A - A kind of dc circuit breaker and its application method - Google Patents
A kind of dc circuit breaker and its application method Download PDFInfo
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- CN109861183A CN109861183A CN201910046366.5A CN201910046366A CN109861183A CN 109861183 A CN109861183 A CN 109861183A CN 201910046366 A CN201910046366 A CN 201910046366A CN 109861183 A CN109861183 A CN 109861183A
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Abstract
The invention discloses a kind of dc circuit breaker and its application methods, wherein the dc circuit breaker includes main logical branch MC, main disconnected branch MB, energy absorption branch EA and auxiliary branch, and it is in series by Fast mechanical switch FD and load current switch LCS that the master leads to branch MC；The disconnected branch MB of the master is in parallel with main logical branch MC, the bridge circuit based on half control device including external diode rectifier bridge and inside；The energy absorption branch EA includes repid discharge branch EA1 and arrester pressure limiting branch EA2 based on half control device；The auxiliary branch is by auxiliary resistance RauxWith auxiliary switch SwIt is composed in series.The quick excision of high-speed reclosure and low current may be implemented in the dc circuit breaker, while having the advantages that shutdown capacity is big, excision is fireballing.
Description
Technical field
The present invention relates to dc circuit breaker fields, and in particular to a kind of dc circuit breaker and its application method.
Background technique
Flexible direct current based on modularization multi-level converter (modular multilevel converter, MMC) is defeated
Power technology has a extensive future in fields such as the large-scale distributed energy is grid-connected, asynchronous Power System Interconnection and city direct current transmission and distributions.
However the direct fault current rate of climb of DC grid is fast, amplitude is big, proposes to the protection technique of direct current system higher
It is required that.Fault clearance technology based on dc circuit breaker can promptly isolate failure, guarantee that normal fortune is continued in system non-faulting part
Row.
Current dc circuit breaker can be divided mainly into dc circuit breaker based on full-controlled device and based on the straight of half control device
Flow breaker.Dc circuit breaker based on full-controlled device utilizes the switch off current ability of full-controlled device, is transferred to full control in electric current
Fault current can be turned off after device branch rapidly, however it turns off the saturation current that capacity is limited to full-controlled device, turns off capacity
It is limited, and cost is high.Compared with full-controlled device, half control device has the advantages that capacity is big, at low cost, stability is good.Due to
Half control device does not have the ability of direct cut-off current, has the dc circuit breaker based on half control device at present and utilizes precharge more
Capacitor turns off half control device.However, additional capacitor precharge power supply will increase the complexity and cost of breaker；It turned off
Fault current can be capacitor charging to system protection voltage in journey, this causes the dc circuit breaker for being based partially on half control device cutting
Mute time when except low current greatly increases；After the completion of shutdown capacitance voltage with shutdown before compare polarity on the contrary, be make open circuit
Device restores turn-off capacity, and the dc circuit breaker for being based partially on half control device needs additional capacitance voltage recovery time, this just leads
Cause is difficult to realize high-speed reclosure.
Summary of the invention
In view of the deficiencies of the prior art, it is an object of the present invention to provide a kind of dc circuit breaker, the dc circuit breaker by
Half control device, diode, capacitor and inductance composition, are free of full-controlled device, with that at low cost, conduction loss is small, capacity is big is excellent
Point；The dc circuit breaker is pre-charged capacitor using line voltage distribution, without additional precharge power supply；The dc circuit breaker utilizes
Auxiliary branch provides additional capacitance charging current, to realize rapidly switching off for low current；The dc circuit breaker has quickly
Reclosing ability.
Another object of the present invention is to provide the application methods of above-mentioned dc circuit breaker.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of dc circuit breaker, including main logical branch MC, main disconnected branch MB, energy absorption branch EA and auxiliary branch, institute
It is in series by Fast mechanical switch FD and load current switch LCS to state main logical branch MC；The disconnected branch MB of the master and main logical branch
Road MC is in parallel, including external diode rectifier bridge and the internal bridge circuit based on half control device；The energy absorption branch
EA includes repid discharge branch EA1 and arrester pressure limiting branch EA2 based on half control device；The auxiliary branch is by auxiliary resistance
RauxWith auxiliary switch SwIt is composed in series.
Further, the load current switch LCS has the electric current transfer switch of load current turn-off capacity by two groups
Differential concatenation composition.
Further, every group of electric current transfer switch is by having wholly-controled device (IGBT, IGCT of switch off current ability
Deng) collectively constitute with antiparallel diode.
Further, the disconnected branch MB of the master includes external diode rectifier bridge and the internal bridge-type based on half control device
The D1 bridge arm of circuit, the diode rectifier bridge is connected with D2 bridge arm common cathode, and the anode of the two is respectively with main logical branch MC's
Electric current flows into end and connects with electric current outflow end；The D3 bridge arm of the diode rectifier bridge is connected with D4 bridge arm common-anode, the two
Cathode flows into end with the electric current of main logical branch MC respectively and electric current outflow end is connect；The bridge circuit packet based on half control device
Include inductance, capacitor and 4 half control devices, 4 half control devices are denoted as Ta, Tb, Tc and Td, wherein Ta and Tc series connection, Tb and
Td series connection, Ta are connect with Tb common-anode, and Tc is connect with Td common cathode, one end and Ta cathode, that is, Tc anode after inductance and capacitor series connection
Connection, one end is connect with Tb cathode, that is, Td anode；The common-anode of Ta, Tb of the bridge circuit are connect with the common cathode of D1, D2,
The common cathode of Tc, Td are connect with the common-anode of D3, D4.
Further, the energy absorption branch EA includes repid discharge branch EA1 and arrester based on half control device
Pressure limiting branch EA2；Repid discharge branch EA1 based on half control device includes one end of half control device Tf and discharge resistance R4, EA1
It is connect with the cathode of Tb, the cathode connection of the other end and Ta；Arrester pressure limiting branch EA2 includes arrester MOV, resistance R3 and two
One end of pole pipe D5, MOV and the cathode of Ta connect, and the cathode of the other end and D5 connect, and the anode of D5 accesses the company of inductance, capacitor
Contact, R3 are in parallel with MOV.
Further, the auxiliary branch includes that auxiliary switch Sw and auxiliary resistance Rux are composed in series；The one of auxiliary branch
End is connect with D3, D4 common-anode of diode rectifier bridge, other end ground connection.Auxiliary switch SwBy quick isolation switch or half control type
Device composition.
Further, the half control type device is to turn off uncontrollable thyristor with controllable conduction ability.
Another object of the present invention can be achieved through the following technical solutions:
A kind of application method of dc circuit breaker needs to send half control device when being pre-charged to capacitor in use
Trigger signal needs to send in transfer current half control device trigger signal, needs to send the touching of half control device in cut-off current
It signals；Due to the symmetry of the direct-current breaker topology, different triggering combination as shown in the table can be taken:
The application method of the dc circuit breaker specifically includes the following steps:
Step 1 after dc circuit breaker access system, will select triggering combination m, m=1,2；It is closed auxiliary switch Sw, according to
Selected triggering combination m sends capacitor and is pre-charged triggering command, and system is to capacitor charging；
More than after system voltage, charging current constantly reduces the sum of capacitance voltage, when charging current is less than half control device
After maintaining electric current, the half control device be connected turns off naturally, turns off Sw；Line fault belongs to incident, and dc circuit breaker exists
It is standby in most of the time, however due to the presence of leakage current, capacitive energy will be slow dissipation；When capacitance voltage is small
When threshold value, it is closed Sw again, m is combined according to selected triggering and sends capacitor precharge triggering command, again to capacitor
Charging；
Step 2, under normal circumstances, system power flow through main logical branch MC, due to the load current switch of main logical branch MC
Electric current transfer voltage is only provided, without system voltage is subjected to, which has very low conduction loss；
DC line fault occurs when step 3, t1, protection is out of order in t2 detection, immediately the triggering group according to selected by step 1
It closes m and sends electric current transfer triggering command, simultaneously turn off load current switch, electric current starts to shift to main disconnected branch MB；
It is 0 that step 4, t3 moment master, which lead to branch current, opens Fast mechanical switch FD without arc at this time；
Step 5, t4 moment trigger combination m according to selected by step 1 and send switch off current triggering command；Fault current starts pair
Capacitor reverse charging, with the charging of capacitance voltage, fault current is gradually reduced；When required excision current value is smaller, in addition to
Switch off current triggering command is sent, auxiliary switch is also closed；The closure of auxiliary switch provides additional charging electricity for capacitor
Stream, to accelerate capacitor charging speed, has also been correspondingly improved the turn-off speed of low current, wait be again turned on after current cut-offs it is auxiliary
Help switch；In order to reduce the turn-off time of breaker as far as possible while guaranteeing the insulation of Fast mechanical switch Trusted recovery, need
The value of Rational choice t4 is wanted, at the time of t4 is no more than Fast mechanical switch the latest and restores insulation completely；
Step 6, capacitance voltage is once more than the reference voltage of arrester, and the fault current for flowing through capacitor is transferred quickly to
EA2 branch；Since the reference voltage of arrester is greater than system nominal voltage, system power can constantly reduce；When fault current is small
When the maintenance electric current of half control device, the half control device in current path turns off naturally；Disconnecting switch on final route will be former
Barrier route is isolated with system rest part；
Step 7, faulty line is isolated after shutdown opens, and Tf is connected, capacitor is discharged rapidly by inductance, R4 and Tf；Electricity
Hold tension discharge to after zero, Ta and Td is connected, capacitance voltage is charged to system voltage again；
Step 8, after waiting certain line insulation recovery time, start reclosing process, send electric current to breaker and turn
Move triggering command；If line current is gradually recovered normally, it is meant that failure has been removed, and can be successively closed Quick mechanical and be opened
It closes and load current switch, electric current is automatically transferred to main logical branch, the half control device in main disconnected branch turns off naturally；If route
Electric current again rapid increase and be more than protection definite value, it is meant that permanent fault has occurred in route, then send switch off current triggering
Instruction, dc circuit breaker can cut off faulty line again.It can be seen that mentioned dc circuit breaker has high-speed reclosure ability.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1, dc circuit breaker provided by the invention is made of diode, half control device, inductance and capacitor, without full control device
Part, with advantage at low cost, that shutdown capacity is big.
2, dc circuit breaker provided by the invention is pre-charged capacitor using line voltage distribution, without additional precharge electricity
Source.
3, dc circuit breaker provided by the invention provides additional capacitance charging current using auxiliary branch, to realize
Low current rapidly switches off.
4, dc circuit breaker provided by the invention has high-speed reclosure ability.
Detailed description of the invention
Fig. 1 is the topology diagram of dc circuit breaker provided in an embodiment of the present invention.
Specific embodiment
Present invention will now be described in further detail with reference to the embodiments and the accompanying drawings, but embodiments of the present invention are unlimited
In this.
Embodiment:
A kind of dc circuit breaker is present embodiments provided, the direct-current breaker topology is as shown in Figure 1, include main logical branch
MC, main disconnected branch MB and auxiliary branch.It includes load current switch LCS and Fast mechanical switch FD that the master, which leads to branch,；It is described
Main disconnected branch and main logical branch circuit parallel connection, including external diode rectifier bridge and the internal bridge circuit based on half control device；Institute
Stating auxiliary branch includes auxiliary resistance and auxiliary switch.
Wherein, the master leads to branch routing load current switch and Fast mechanical switch is composed in series；The load current is opened
The electric current transfer switch differential concatenation for having load current turn-off capacity by two groups is closed to form；Every group of electric current transfer switch is by having
The wholly-controled devices such as IGBT, IGCT of switch off current ability are collectively constituted with antiparallel diode.
The disconnected branch of the master includes external diode rectifier bridge and the internal bridge circuit based on half control device；Described two
The D1 bridge arm of pole pipe rectifier bridge is connected with D2 bridge arm common cathode, and the anode of the two connects with the left end of main logical branch and right end respectively
It connects；The D3 bridge arm of the diode rectifier bridge is connected with D4 bridge arm common-anode, and the cathode of the two leads to the left end of branch with master respectively
It is connected with right end；The bridge circuit based on half control device includes inductance, capacitor and 4 half control devices, 4 half control devices point
It is not designated as Ta, Tb, Tc and Td, wherein Ta and Tc series connection, Tb and Td series connection, Ta are connect with Tb common-anode, and Tc and Td common cathode connect
It connects, one end is connect with Ta cathode (Tc anode) after inductance and capacitor series connection, and one end is connect with Tb cathode (Td anode)；The bridge-type
The common-anode of Ta, Tb of circuit are connect with the common cathode of D1, D2, and the common cathode of Tc, Td are connect with the common-anode of D3, D4.
The energy absorption branch EA includes repid discharge branch EA1 and arrester pressure limiting branch based on half control device
EA2；Repid discharge branch EA1 based on half control device includes one end of half control device Tf and discharge resistance R4, EA1 and the yin of Tb
The cathode of pole connection, the other end and Ta connect；Arrester pressure limiting branch EA2 includes arrester MOV, resistance R3 and diode D5,
One end of MOV and the cathode of Ta connect, and the cathode of the other end and D5 connect, and the anode of D5 accesses the tie point of inductance, capacitor, R3
It is in parallel with MOV.
The auxiliary branch is by auxiliary resistance RauxWith auxiliary switch SwIt is composed in series.Described auxiliary branch one end and two poles
D3, D4 common-anode of pipe rectifier bridge connect, other end ground connection；The auxiliary switch can be by quick isolation switch or half control type device
Composition.Specifically, the half control device is to turn off uncontrollable thyristor with controllable conduction ability.
The dc circuit breaker in use, needs to send half control device trigger signal when being pre-charged to capacitor,
It needs to send half control device trigger signal when transfer current, needs to send half control device trigger signal in cut-off current.Due to
The symmetry of direct-current breaker topology can take different triggering combinations, be shown in Table 1.
1 half control device of table triggers combination
| Triggering combination | Capacitor is pre-charged triggering command | Electric current shifts triggering command | Switch off current triggering command |
| Combination 1 | Ta, Td is connected | Ta, Tc is connected | Tb is connected |
| Combination 2 | Ta, Td is connected | Tb, Td is connected | Tc is connected |
In the present embodiment, by taking triggering combination 1 as an example, the application method of the dc circuit breaker is illustrated.It uses
Method the following steps are included:
Step 1, triggering combination 1 will after dc circuit breaker access system, be selected；It is closed auxiliary switch Sw, according to selected touching
Hair combination 1 sends capacitor and is pre-charged triggering command, i.e., conducting Ta, Td, system have two to capacitor charging, capacitor charging path:
D1—Ta—C—L—Td—Sw—Raux；D2—Ta—C—L—Td—Sw—Raux；
More than after system voltage, charging current constantly reduces the sum of capacitance voltage, when charging current is less than half control device
After maintaining electric current, the half control device be connected turns off naturally, turns off Sw；
Step 2, under normal circumstances, system power flows through main logical branch, since the load current switch of main logical branch only mentions
Power supply stream transfer voltage, nothing is subjected to system voltage, therefore dc circuit breaker has very low conduction loss；
Step 3, DC line fault occurs when t1, protection is out of order in t2 detection, immediately the triggering group according to selected by step 1
It closes 1 and sends electric current transfer triggering command, i.e. conducting Ta, Tc, simultaneously turn off load current switch；Electric current starts to turn to main disconnected branch
It moves；
Step 4, it is 0 that t3 moment master, which leads to branch current, opens Fast mechanical switch FD without arc at this time；Quick mechanical is opened to open
After closing FD, the current path inside dc circuit breaker are as follows: D1-Ta-Tc-D4；
Step 5, the t4 moment triggers combination 1 according to selected by step 1 and sends switch off current triggering command, i.e. conducting Tb；Capacitor
It is discharged by inductance L, thyristor Ta, thyristor Tb, capacitance discharge current is contrary with the fault current for flowing through Ta；t5
Moment capacitance current is equal with fault current, and Ta electric current is reduced to 0 and reverse bias, and capacitor is put by diode rectifier bridge
Electricity；When the reverse-bias time of Ta is greater than its turn-off time, Ta reliable turn-off；T6 moment capacitance current is again equal to failure electricity
Stream, fault current is by D1, Tb, L, Tc, D4 to capacitor reverse charging；With the charging of capacitor, fault current is gradually reduced；When
When required excision current value is smaller, in addition to sending switch off current triggering command, it to be also closed auxiliary switch Sw；Auxiliary switch closes
It is combined into capacitor and provides additional charging current, to accelerate capacitor charging speed, be correspondingly improved the shutdown speed of low current
Degree, is again turned on auxiliary switch after waiting current cut-offs.In order to the greatest extent may be used while guaranteeing the insulation of Fast mechanical switch Trusted recovery
The turn-off time that breaker can be reduced, the value of Rational choice t4 is needed, t4 is no more than Fast mechanical switch the latest and restores completely
At the time of insulation.
Step 6, capacitance voltage is once more than the reference voltage of arrester, and the fault current for flowing through capacitor is transferred quickly to
EA2 branch；Since the reference voltage of arrester is greater than system nominal voltage, system power can constantly reduce；T7 moment failure electricity
Stream is less than the maintenance electric current of half control device, and Tb, Tc in current path are turned off naturally；Disconnecting switch on final route is by failure
Route is isolated with system rest part；
Step 7, faulty line is isolated after shutdown opens, and Tf is connected, capacitor is discharged rapidly by inductance, R4 and Tf；Electricity
Hold tension discharge to after zero, Ta and Td is connected, capacitance voltage is charged to system voltage again；Step 6, certain route is waited
After insulator recovery time, start reclosing process；If line current is gradually recovered normally, it is meant that failure has been removed, can
To be successively closed Fast mechanical switch and load current switch, electric current is automatically transferred to main logical branch, Ta in main disconnected branch and
Tc is turned off naturally；If line current again rapid increase and be more than protection definite value, it is meant that permanent fault has occurred in route,
Switch off current triggering command is then sent, i.e., conducting Tb, dc circuit breaker can cut off faulty line again.It can be seen that mentioning straight
Stream breaker has high-speed reclosure ability.
The above, only the invention patent preferred embodiment, but the scope of protection of the patent of the present invention is not limited to
This, anyone skilled in the art is in the range disclosed in the invention patent, according to the present invention the skill of patent
Art scheme and its patent of invention design are subject to equivalent substitution or change, belong to the scope of protection of the patent of the present invention.
Claims (9)
1. a kind of dc circuit breaker, it is characterised in that: the dc circuit breaker includes main logical branch MC, main disconnected branch MB, energy
Branch EA and auxiliary branch are absorbed, it is in series by Fast mechanical switch FD and load current switch LCS that the master leads to branch MC；
The disconnected branch MB of the master is in parallel with main logical branch MC, the bridge-type based on half control device including external diode rectifier bridge and inside
Circuit；The energy absorption branch EA includes repid discharge branch EA1 and arrester pressure limiting branch EA2 based on half control device；
The auxiliary branch is by auxiliary resistance RauxWith auxiliary switch SwIt is composed in series.
2. a kind of dc circuit breaker according to claim 1, it is characterised in that: the load current switch LCS is by two groups
The electric current transfer switch differential concatenation composition for having load current turn-off capacity.
3. a kind of dc circuit breaker according to claim 2, it is characterised in that: every group of electric current transfer switch is by having
The wholly-controled device of switch off current ability is collectively constituted with antiparallel diode.
4. a kind of dc circuit breaker according to claim 1, it is characterised in that: the disconnected branch MB of the master includes the two of outside
Pole pipe rectifier bridge and the internal bridge circuit based on half control device, the D1 bridge arm and D2 bridge arm common cathode of the diode rectifier bridge
Connection, the anode of the two flows into end with the electric current of main logical branch MC respectively and electric current outflow end is connect；The diode rectifier bridge
D3 bridge arm connected with D4 bridge arm common-anode, the cathode of the two flows into end and electric current outflow end with the electric current of main logical branch MC respectively
Connection；The bridge circuit based on half control device includes inductance, capacitor and 4 half control devices, and 4 half control devices are denoted as
Ta, Tb, Tc and Td, wherein Ta and Tc series connection, Tb and Td series connection, Ta are connect with Tb common-anode, and Tc is connect with Td common cathode, inductance
It is connect with one end after capacitor series connection with Ta cathode, that is, Tc anode, one end is connect with Tb cathode, that is, Td anode；The bridge circuit
The common-anode of Ta, Tb are connect with the common cathode of D1, D2, and the common cathode of Tc, Td are connect with the common-anode of D3, D4.
5. a kind of dc circuit breaker according to claim 4, it is characterised in that: the energy absorption branch EA includes being based on
The repid discharge branch EA1 and arrester pressure limiting branch EA2 of half control device；Repid discharge branch EA1 packet based on half control device
The cathode of one end and Tb for including half control device Tf and discharge resistance R4, EA1 connects, and the cathode of the other end and Ta connect；Arrester
Pressure limiting branch EA2 includes arrester MOV, the cathode connection of one end and Ta of resistance R3 and diode D5, MOV, the other end and D5
Cathode connection, the tie point of the anode access inductance of D5, capacitor, R3 is in parallel with MOV.
6. a kind of dc circuit breaker according to claim 4, it is characterised in that: the auxiliary branch by auxiliary switch Sw and
Auxiliary resistance Rux is composed in series；One end of auxiliary branch and D3, D4 common-anode of diode rectifier bridge connect, other end ground connection；
Auxiliary switch SwIt is made of quick isolation switch or half control type device.
7. a kind of dc circuit breaker according to claim 6, it is characterised in that: the half control type device is with can conduct
Logical ability and turn off uncontrollable thyristor.
8. the application method of the dc circuit breaker of claim 5 or 6, it is characterised in that: in use, to capacitor preliminary filling
It needs to send half control device trigger signal when electric, needs to send half control device trigger signal in transfer current, in cut-off current
When need to send half control device trigger signal；Due to the symmetry of the direct-current breaker topology, can take as shown in the table
Different triggering combinations:
。
9. the application method of dc circuit breaker according to claim 8, which is characterized in that the method specifically includes following step
It is rapid:
Step 1 after dc circuit breaker access system, will select triggering combination m, m=1,2；It is closed auxiliary switch Sw, according to selected
Triggering combination m sends capacitor and is pre-charged triggering command, and system is to capacitor charging；
More than after system voltage, charging current constantly reduces the sum of capacitance voltage, when charging current is less than the maintenance of half control device
After electric current, the half control device be connected turns off naturally, turns off Sw；Line fault belongs to incident, and dc circuit breaker is in big portion
Timesharing is interior standby, however due to the presence of leakage current, capacitive energy will be slow dissipation；When capacitance voltage is less than door
When threshold value, it is closed S againw, m is combined according to selected triggering and sends capacitor precharge triggering command, again to capacitor charging；
Step 2, under normal circumstances, system power flow through main logical branch MC, since the load current switch of main logical branch MC only mentions
Power supply stream transfer voltage, without system voltage is subjected to, which has very low conduction loss；
DC line fault occurs when step 3, t1, protection is out of order in t2 detection, immediately the triggering combination m according to selected by step 1
It sends electric current and shifts triggering command, simultaneously turn off load current switch, electric current starts to shift to main disconnected branch MB；
It is 0 that step 4, t3 moment master, which lead to branch current, opens Fast mechanical switch FD without arc at this time；
Step 5, t4 moment trigger combination m according to selected by step 1 and send switch off current triggering command；Fault current starts to capacitor
Reverse charging, with the charging of capacitor, fault current is gradually reduced；When required excision current value is smaller, in addition to sending electric current
Triggering command is turned off, auxiliary switch is also closed；The closure of auxiliary switch provides additional charging current for capacitor, thus plus
Fast capacitor charging speed, has also been correspondingly improved the turn-off speed of low current, has been again turned on auxiliary switch after waiting current cut-offs；For
While guaranteeing the insulation of Fast mechanical switch Trusted recovery, reduces the turn-off time of breaker as far as possible, need rationally to select
The value of t4 is taken, at the time of t4 is no more than Fast mechanical switch the latest and restores insulation completely；
Step 6, capacitance voltage is once more than the reference voltage of arrester, and the fault current for flowing through capacitor is transferred quickly to EA2 branch
Road；Since the reference voltage of arrester is greater than system nominal voltage, system power can constantly reduce；When fault current is less than half control
When the maintenance electric current of device, the half control device in current path turns off naturally；Disconnecting switch on final route is by faulty line
It is isolated with system rest part；
Step 7, faulty line is isolated after shutdown opens, and Tf is connected, capacitor is discharged rapidly by inductance, R4 and Tf；Capacitor electricity
After pressure is discharged to zero, Ta and Td is connected, capacitance voltage is charged to system voltage again；
Step 8, after waiting certain line insulation recovery time, start reclosing process, send electric current transfer touching to breaker
Send instructions；If line current is gradually recovered normally, it is meant that failure has been removed, and Fast mechanical switch and load are successively closed
Current switch, electric current are automatically transferred to main logical branch, and the half control device in main disconnected branch turns off naturally；If line current is again
Rapid increase and be more than protection definite value, it is meant that permanent fault has occurred in route, then sends switch off current triggering command, direct current
Breaker can cut off faulty line again.
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Cited By (7)
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| CN110350491A (en) * | 2019-06-14 | 2019-10-18 | 华北电力大学 | Decompression clamping type direct-current breaker topology suitable for DC grid |
| CN111917107A (en) * | 2020-07-10 | 2020-11-10 | 华北电力大学 | Capacitive circuit breaker topology suitable for high-voltage direct-current power grid |
| CN112865061A (en) * | 2021-01-07 | 2021-05-28 | 天津大学 | Direct current load switch based on power electronic device and switching method thereof |
| CN112968420A (en) * | 2021-02-18 | 2021-06-15 | 天津大学 | Thyristor type hybrid direct current circuit breaker and control method thereof |
| WO2023124114A1 (en) * | 2021-12-28 | 2023-07-06 | 国网智能电网研究院有限公司 | Self-energy-taking hybrid direct-current circuit breaker and application method therefor |
| CN116865738A (en) * | 2023-09-04 | 2023-10-10 | 中国科学院电工研究所 | Direct-current solid-state circuit breaker circuit topology based on semi-controlled device and control method |
| CN117013510A (en) * | 2023-09-27 | 2023-11-07 | 国网江苏省电力有限公司电力科学研究院 | Superconductive current-limiting hybrid direct current breaker for controllable energy dissipation |
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