CN109103854A - A kind of mechanical direct-current breaker topology structure - Google Patents
A kind of mechanical direct-current breaker topology structure Download PDFInfo
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- CN109103854A CN109103854A CN201811064913.4A CN201811064913A CN109103854A CN 109103854 A CN109103854 A CN 109103854A CN 201811064913 A CN201811064913 A CN 201811064913A CN 109103854 A CN109103854 A CN 109103854A
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- current
- circuit breaker
- branch
- change
- breaker
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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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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The present invention relates to a kind of mechanical direct-current breaker topology structures, and including the auxiliary circuit breaker and three parallel branches for cutting off residual current, first branch routing is constituted for the main circuit breaker of system worked well electric current to be connected；Article 2 branch is change of current branch；Article 3 branch is that energy discharges branch.Change of current charging capacitor in the present invention can be charged using transmission line of electricity, not need to install the charger that exchange current charge capacitor charges again.The present invention can generate multiple oscillation when short-circuit conditions occur for DC transmission system, by the reverse current of investment, and it is smaller to decay, to make transmission line of electricity electric current multiple zero crossing occur, to can guarantee that mechanical dc circuit breaker being capable of reliable turn-off.
Description
Technical field
The invention belongs to dc circuit breaker technical field, in particular to a kind of mechanical direct-current breaker topology structure.
Background technique
With the fast development of flexible DC transmission, in order to ensure the safe operation of DC transmission system, there is an urgent need to one
It covers reliable direct current and cut-offs scheme.In AC transmission system, alternating current passes through zero point twice, breaker in each period
It can be cut-off using this current zero-crossing point realization twice.But in DC transmission system, simultaneously zero crossing is not present in electric current, therefore to open
Power-off stream is just relatively difficult.
Direct current cutoff method based on artificial zero passage is that high voltage direct current cut-offs one of technical solution important method.Manually
It crosses zero breaking technology and obtains research and application in low-pressure field, there has also been corresponding researchs in terms of medium and high pressure.And
Whether can reliably realize that artificial zero passage directly affects can cut off DC current fast and reliablely, for the safety of system operation
Reliably there is vital effect.
In the topological structure of existing dc circuit breaker, dc circuit breaker cut-offs reliability always by suspection.Cause
This, cut-offs reliability for raising dc circuit breaker, designs a kind of new direct-current breaker topology structure, can solve to be based on people
The above problem that the dc circuit breaker of work zero passage technology faces.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide one kind can be to the specified electricity in DC transmission system
Stream and the short circuit current occurred carry out the mechanical direct-current breaker topology structure of reliable turn-off.
The technical scheme to solve the above technical problems is that a kind of mechanical direct-current breaker topology structure, packet
The auxiliary circuit breaker and three parallel branches for cutting off residual current are included, the auxiliary circuit breaker is mechanical direct current interruption
Device；First branch routing is constituted for the main circuit breaker of system worked well electric current to be connected, and main circuit breaker is used by electromagnetic repulsion force
The operating mechanism that mechanism and permanent magnet mechanism are constituted, is the mechanical dc circuit breaker with quick-speed turning on-off ability, main circuit breaker goes out
Line end is connected with the end of incoming cables of auxiliary circuit breaker；Article 2 branch is change of current branch for putting into reverse current, including inductance, crystalline substance
Brake tube, diode, resistance, change of current charging capacitor, inductance one terminate main circuit breaker end of incoming cables, and the inductance other end and thyristor are just
Extremely it is connected, the cathode of thyristor connects one end of change of current charging capacitor cathode and resistance, the other end ground connection of resistance, change of current charging electricity
Hold anode to be connected with the end of incoming cables of auxiliary circuit breaker, diode and thyristor inverse parallel；Article 3 branch is that energy discharges branch,
Including ZNO arrester, ZNO arrester one end is connected with the anode of thyristor, the ZNO arrester other end and auxiliary circuit breaker into
Line end is connected.
Preferably, main circuit breaker uses vacuum circuit breaker.
Preferably, the metal oxide arrester that arrester uses system voltage grade to match.
The present invention has the advantage that
1. the change of current charging capacitor in the present invention can be charged using transmission line of electricity, do not need that exchange current charge is installed again
The charger that capacitor charges.
2. the reverse current of investment can be generated multiple vibration when short-circuit conditions occur for DC transmission system by the present invention
It swings, and it is smaller to decay, to make transmission line of electricity electric current multiple zero crossing occur, to can guarantee that mechanical dc circuit breaker can
Reliable turn-off.
Detailed description of the invention
Fig. 1 is mechanical direct-current breaker topology structural schematic diagram of the invention；
Fig. 2 is mechanical dc circuit breaker interrupting process artificial circuit schematic diagram of the invention；
Fig. 3 is mechanical dc circuit breaker interrupting process system power emulation schematic diagram of the invention；
Fig. 4 is mechanical dc circuit breaker interrupting process main circuit breaker current simulations schematic diagram of the invention；
Fig. 5 is mechanical dc circuit breaker interrupting process change of current charging capacitor current simulations schematic diagram of the invention；
Fig. 6 is mechanical dc circuit breaker interrupting process change of current branch current emulation schematic diagram of the invention；
Fig. 7 is mechanical dc circuit breaker interrupting process arrester current simulations schematic diagram of the invention；
Fig. 8 is mechanical dc circuit breaker interrupting process main circuit breaker voltage emulation schematic diagram of the invention.
Specific embodiment
The above is only the general introductions of technical solution of the present invention, in order to better understand the technical means of the present invention, below
In conjunction with attached drawing, the present invention is described in further detail with specific embodiment.
As shown in Fig. 1, a kind of mechanical direct-current breaker topology structure, it is disconnected including the auxiliary for cutting off residual current
Road device BCB and three parallel branches, first branch routing are constituted for the main circuit breaker VCB of system worked well electric current to be connected,
Main circuit breaker VCB uses the operating mechanism being made of electromagnetic repulsion mechanism and permanent magnet mechanism, main circuit breaker VCB leading-out terminal and auxiliary
The end of incoming cables of breaker BCB is connected；Article 2 branch is change of current branch, including inductance L1, thyristor S1, diode D1, resistance
R1, the change of current charging capacitor C1, inductance L1 mono- terminate the end of incoming cables main circuit breaker VCB, the anode of the inductance L1 other end and thyristor S1
It is connected, the cathode of thyristor S1 connects one end of change of current charging capacitor C1 cathode and resistance R1, the other end ground connection of resistance R1, the change of current
Charging capacitor C1 anode is connected with the end of incoming cables of auxiliary circuit breaker BCB, diode D1 and thyristor S1 inverse parallel；Article 3 branch
Branch is discharged for energy, including the one end arrester MOV ZNO arrester MOV, ZNO is connected with the anode of thyristor S1, ZNO is lightning-arrest
The device MOV other end is connected with the end of incoming cables of auxiliary circuit breaker BCB.
Above-mentioned mechanical direct-current breaker topology structure is suitable for 10kV DC transmission system.
The working principle of the invention is that under normal circumstances, main circuit breaker VCB and auxiliary circuit breaker BCB are in closed form
State, thyristor S1 is in an off state, and system operating current flows through main circuit breaker VCB and auxiliary circuit breaker BCB.When system occurs
When short trouble, system operating current starts to rise rapidly.Control unit monitors short trouble, gives main circuit breaker VCB immediately
Electromagnetic repulsion mechanism send separating brake order, main circuit breaker VCB contact starts to open.When short circuit current rises to 10kA
(rated current in 10kV DC transmission system is 2kA.From occur short trouble that time, by 2.4ms electric current can on
It is raised to 10kA.The time of this 2.4ms is necessary, because only that by can just reach conjunction between 2.4ms moving contact and static contact
Suitable opens away from if the time is short, although electric current does not rise to the so big electric current of 10kA, moving contact and static contact are also
Do not reach suitably open away from, that is to say, that moving contact and static contact from it is too close, even if investment reverse current, can also weigh at once
Combustion.), main circuit breaker VCB contact gap, which reaches, at this time is able to bear transient state drop-out voltage (Transient Interruption
Voltage, TIV) properly open and send triggering and conducting signal to thyristor S1 away from, control unit, thyristor S1 triggering and conducting is changed
Current charge capacitor C1 starts to discharge.Electric current is gradually transferred in change of current branch from main circuit breaker VCB, and in this stage, the change of current is filled
Capacitor C1 continuous discharge, voltage constantly reduce, this is first commutation course.Electric current is complete after first commutation course
Total transfer is into change of current branch, and the electric arc in main circuit breaker VCB extinguishes in current zero-crossing point, and main circuit breaker VCB both ends TIV will be fast
Speed increases to first negative peak.Change of current charging capacitor C1 continuous discharge, both end voltage are gradually decrease to zero.Hereafter, it changes
Current charge capacitor C1 continues to charge, and the voltage of change of current charging capacitor C1 starts positive increase, meanwhile, the both ends main circuit breaker VCB
TIV also increases along with the increase of change of current charging capacitor C1 both end voltage.In addition, due to the spuious change of current charging capacitor of breaker
The reason of, main circuit breaker VCB both end voltage can vibrate, and oscillation amplitude can be gradually reduced.The both ends change of current charging capacitor C1 electricity
Pressure reaches arrester MOV reference voltage, and arrester MOV starts to act, and system power starts to be transferred to from change of current charging capacitor C1
Arrester MOV.Electric current is gradually transferred in arrester MOV from change of current charging capacitor C1 and thyristor S1, this is second and changes
Stream process.Electric current is transferred to arrester MOV branch completely, at this moment flows through the electric current mistake in change of current charging capacitor C1 and thyristor S1
Zero.Electric current in arrester MOV is gradually decayed, and hereafter arrester MOV is turned off because of current over-zero.Auxiliary circuit breaker BCB starts
Movement, when system power zero passage, auxiliary circuit breaker BCB contact gap reaches certain and opens away from so as to bearing its both ends
Recovery voltage, final breaking circuit completes entire interrupting process.Wherein control unit to main circuit breaker send separating brake order,
Sending Continuity signal to thyristor is the prior art.
For the feasibility for verifying above-mentioned mechanical dc circuit breaker scheme, using Matlab software to above-mentioned mechanical direct current
The breaker course of work is emulated, and interrupting process artificial circuit is as shown in Fig. 2, include a DC power supply DC, an electricity
Feel L0, resistance R0, disconnecting switch Sd, mechanical direct-current breaker topology structure, load resistance R2, the DC power supply DC is just
Pole is connected with one end of inductance L0, the other end of inductance L0 and resistance R0, disconnecting switch Sd, mechanical dc circuit breaker and negative
The one end for carrying resistance R2 is sequentially connected, the other end ground connection of load resistance R2.
At the t1 moment, system short-circuit fault occurs, and after about 200 μ s, control unit monitors short trouble, immediately to main disconnected
The electromagnetic repulsion mechanism of road device VCB sends separating brake order, and main circuit breaker VCB contact starts to open, while electric in main circuit breaker VCB
Arc starts to burn.
At the t2 moment, short circuit current rises to 10kA, and main circuit breaker VCB contact gap, which reaches, at this time is able to bear transient state and opens
Power-off pressure (Transient Interruption Voltage, TIV) is properly opened away from control unit sends to thyristor S1 and touches
Continuity signal, thyristor S1 triggering and conducting are sent out, change of current charging capacitor C1 starts to discharge.
At t2~t3 moment, electric current is gradually transferred in change of current branch from main circuit breaker VCB, and in this stage, the change of current is filled
Capacitor C1 continuous discharge, voltage constantly reduce, this is first commutation course.
At the t3 moment, first commutation course terminates, and electric current is transferred to completely in change of current branch, in main circuit breaker VCB
Electric arc extinguishes in current zero-crossing point, and main circuit breaker VCB both ends TIV will be rapidly increased to first negative peak.
At t3~t4 moment, change of current charging capacitor C1 continuous discharge, both end voltage is gradually decrease to zero.Hereafter, the change of current
Charging capacitor C1 continues to charge, and the voltage of change of current charging capacitor C1 starts positive increase, meanwhile, main circuit breaker VCB both ends TIV
Increase along with the increase of change of current charging capacitor C1 both end voltage.In addition, due to the original of the spuious change of current charging capacitor of breaker
Cause, main circuit breaker VCB both end voltage can vibrate, and oscillation amplitude can be gradually reduced.
At the t4 moment, change of current charging capacitor C1 both end voltage reaches arrester MOV reference voltage, and arrester MOV starts to move
Make, system power starts to be transferred to arrester MOV from change of current charging capacitor C1.
At t4~t5 moment, electric current is gradually transferred in arrester MOV from change of current charging capacitor C1 and thyristor S1, this
It is second commutation course.
At the t5 moment, electric current is transferred to arrester MOV branch completely, at this moment flows through change of current charging capacitor C1 and thyristor S1
In current over-zero.
Electric current in t5~t6 moment, arrester MOV is gradually decayed.
At the t6 moment, arrester MOV is turned off because of current over-zero.
Auxiliary circuit breaker BCB is acted before the t6 moment, when t6 moment system power zero passage, auxiliary circuit breaker BCB touching
Head gap reaches certain and opens away from the recovery voltage so as to bear its both ends, final breaking circuit, and completion was entirely cut-off
Journey.
In terms of dc circuit breaker of the present invention for 10kV DC power transmission line is used in following two:
1. the rated current of pair 10kV DC power transmission line turns off, to realize the switching of relevant device.
2. the short circuit current that pair 10kV DC power transmission line occurs turns off, to protect system not damaged further
Evil.
The above is only preferred embodiments of the invention, is not intended to limit the present invention in any form.Ability
Field technique personnel make a little simple modification, equivalent variations or modification using the technology contents of the disclosure above, all fall within the present invention
Protection scope in.
Claims (4)
1. a kind of mechanical direct-current breaker topology structure, it is characterised in that: including the backup shutdoun for cutting off residual current
Device (BCB) and three parallel branches, first branch route main circuit breaker (VCB) structure for system worked well electric current to be connected
At main circuit breaker (VCB) is using the operating mechanism being made of electromagnetic repulsion mechanism and permanent magnet mechanism, main circuit breaker (VCB) outlet
End is connected with the end of incoming cables of auxiliary circuit breaker (BCB)；Article 2 branch be change of current branch, including inductance (L1), thyristor (S1),
Diode (D1), resistance (R1), change of current charging capacitor (C1), inductance (L1) one terminate the end of incoming cables main circuit breaker (VCB), inductance
(L1) other end is connected with the anode of thyristor (S1), and the cathode of thyristor (S1) connects change of current charging capacitor (C1) cathode and resistance
(R1) one end, the other end ground connection of resistance (R1), the end of incoming cables of change of current charging capacitor (C1) anode and auxiliary circuit breaker (BCB)
It is connected, diode (D1) and thyristor (S1) inverse parallel；Article 3 branch is that energy discharges branch, including arrester (MOV), is kept away
Thunder device one end (MOV) is connected with the anode of thyristor (S1), the inlet wire of arrester (MOV) other end and auxiliary circuit breaker (BCB)
End is connected.
2. mechanical direct-current breaker topology structure according to claim 1, it is characterised in that: the mechanical direct current
Breaker topological structure is suitable for 10kV DC transmission system.
3. mechanical direct-current breaker topology structure according to claim 1, it is characterised in that: main circuit breaker (VCB) is adopted
Use vacuum circuit breaker.
4. mechanical direct-current breaker topology structure according to claim 1, it is characterised in that: arrester (MOV) uses
The metal oxide arrester that system voltage grade matches.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811064913.4A CN109103854A (en) | 2018-09-12 | 2018-09-12 | A kind of mechanical direct-current breaker topology structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811064913.4A CN109103854A (en) | 2018-09-12 | 2018-09-12 | A kind of mechanical direct-current breaker topology structure |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109787187A (en) * | 2019-01-28 | 2019-05-21 | 湖北工业大学 | A kind of novel bidirectional, dc short circuit current blocking circuit topological structure and its control strategy |
| CN110401174A (en) * | 2019-06-11 | 2019-11-01 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Direct current vacuum circuit breaker main circuit topology and its method for dividing are pressed in one kind |
| CN110957708A (en) * | 2019-12-05 | 2020-04-03 | 东北电力大学 | Mechanical direct-current circuit breaker based on RC auxiliary branch and control method thereof |
| CN111030076A (en) * | 2019-11-26 | 2020-04-17 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Bidirectional mixed medium-voltage direct-current load switch and control method thereof |
| WO2022116043A1 (en) * | 2020-12-02 | 2022-06-09 | Abb Schweiz Ag | Direct current circuit breaker and protection system |
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| CN206564462U (en) * | 2017-02-28 | 2017-10-17 | 天津市斯沃电器有限公司 | The topological structure of hybrid dc circuit breaker |
| CN107863761A (en) * | 2017-11-29 | 2018-03-30 | 中国南方电网有限责任公司电网技术研究中心 | High-voltage direct-current circuit breaker with saturable reactor |
| CN209267161U (en) * | 2018-09-12 | 2019-08-16 | 山东电力设备有限公司 | A kind of mechanical direct-current breaker topology structure |
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| JP2003123569A (en) * | 2001-10-12 | 2003-04-25 | Mitsubishi Electric Corp | Direct current vacuum circuit breaker |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109787187A (en) * | 2019-01-28 | 2019-05-21 | 湖北工业大学 | A kind of novel bidirectional, dc short circuit current blocking circuit topological structure and its control strategy |
| CN110401174A (en) * | 2019-06-11 | 2019-11-01 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Direct current vacuum circuit breaker main circuit topology and its method for dividing are pressed in one kind |
| CN111030076A (en) * | 2019-11-26 | 2020-04-17 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Bidirectional mixed medium-voltage direct-current load switch and control method thereof |
| CN111030076B (en) * | 2019-11-26 | 2021-06-25 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Control method of bidirectional mixed medium-voltage direct-current load switch |
| CN110957708A (en) * | 2019-12-05 | 2020-04-03 | 东北电力大学 | Mechanical direct-current circuit breaker based on RC auxiliary branch and control method thereof |
| WO2022116043A1 (en) * | 2020-12-02 | 2022-06-09 | Abb Schweiz Ag | Direct current circuit breaker and protection system |
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