CN101820170B - Device and method for cutting off short-circuit current - Google Patents
Device and method for cutting off short-circuit current Download PDFInfo
- Publication number
- CN101820170B CN101820170B CN2010101921053A CN201010192105A CN101820170B CN 101820170 B CN101820170 B CN 101820170B CN 2010101921053 A CN2010101921053 A CN 2010101921053A CN 201010192105 A CN201010192105 A CN 201010192105A CN 101820170 B CN101820170 B CN 101820170B
- Authority
- CN
- China
- Prior art keywords
- short
- circuit
- current
- magnetic saturation
- saturation reactor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention discloses a device and a method for cutting off short-circuit current. The device can improve the arc extinguishing performance of a circuit breaker, improve the cut-off capacity of the circuit breaker and shorten the arc extinguishing time of the circuit breaker. The device comprises the circuit breaker, a high-voltage switch and a magnetic saturation reactor. The high-voltage switch is connected in parallel with the magnetic saturation reactor and then connected in series with the circuit breaker. The device for cutting off the short-circuit current is connected in series with a power supply loop. When a power system runs normally, the high-voltage switch of the device for cutting off the short-circuit current is closed, and the circuit breaker is also closed. When the power system runs normally, the device for cutting off the short-circuit current has zero loss. When the power system is short-circuited and the short-circuit current needs to be cut off, the high-voltage switch of the device is first tripped, and the magnetic saturation reactor is connected into a short-circuit current loop. The magnetic saturation reactor reduces the current values of the short-circuit current in sections surrounding a zero crossing point and prolongs the time of the current in low-current sections surrounding the zero crossing point. Then the circuit breaker is tripped to cut off the short-circuit current.
Description
Technical field
The present invention relates to electric power system and send the power transformation field, particularly the device and method of cutting-off of short-circuit electric current.
Background technology
Along with the continuous development of electric power system, the continuous rising of generate output, the electric power system short circuit current that causes that is short-circuited increases thereupon.The increase of short circuit current is to power system stability, have very big harm to device security.The system limited in one's ability of circuit breaker cutting-off of short-circuit electric current, short circuit current surpass when circuit breaker is maximum to cut off current value, and circuit breaker can't cutting-off of short-circuit electric current.The development of high-voltage large-capacity circuit breaker becomes the difficult problem in device for switching field.
The patent No. is the short circuit current limiter of 200420038425.3,200520071934.0,200710019429.5,2008102265069 inventions, and its purpose all is the limiting short-circuit current amplitude.All short circuit current limiters that in the past proposed all exist bulky, expensive shortcoming.In addition, document " Qian Jiali, Guan Yonggang. the rectifier type fault current limiter is to the influence [J] of primary cut-out folding ability, Tsing-Hua University's journal (natural science edition), 2005,45 (10), 1309 ~ 1312 pages." point out: amplitude of short circuit reduces, and the circuit breaker rupturing capacity not necessarily improves.
The patent No. is 2008101592788 invention " short circuit current limiter device and method "; Propose a kind of short circuit current that reduces, reduce particularly that time, the short circuit current limiter volume of little electric current section reduces around the current value, lengthening current zero-crossing point place of section around the short circuit current zero crossing place, the short circuit current limiter manufacturing cost reduces, less short-circuit current limiting device and the method for loss when electric power system normally moves.Can improve the breaker arc extinguishing performance, improve the circuit breaker rupturing capacity and shorten arc extinguishing time.But the manufacturing cost of the method that this patent proposes is still higher.
Summary of the invention
The object of the invention addresses the above problem exactly, provides that a kind of equipment volume is littler, manufacturing cost is lower, the device and method of the cutting-off of short-circuit electric current that method is easier.
For realizing above-mentioned purpose, the present invention adopts following technical scheme:
A kind of device of cutting-off of short-circuit electric current, it comprises: circuit breaker, high-voltage switch gear, magnetic saturation reactor is connected with circuit breaker after said high-voltage switch gear and the magnetic saturation reactor parallel connection, and series connection inserts current supply circuit again.
After magnetic saturation reactor drops into the short circuit current loop; When around the short circuit current zero crossing, arriving smaller or equal to 2 milliseconds of regions greater than 0; The closed loop iron core of magnetic saturation reactor is unsaturated; The magnetic saturation reactor impedance is the excitatory impedance of approach infinity, and the short circuit current of this section is close to zero; When the short circuit current zero crossing was on every side beyond the regions, the closed loop iron core of magnetic saturation reactor was saturated.
A kind of method of work of device of cutting-off of short-circuit electric current is:
When electric power system normally moved, high-voltage switch gear was closed, breaker closing;
When electric power system is short-circuited, when needing cutting-off of short-circuit electric current, the high-voltage switch gear of first tripper drops into the short circuit current loop to magnetic saturation reactor; Tripping circuit breaker then, thereby cutting-off of short-circuit electric current.
The invention has the beneficial effects as follows: the loss of cutting-off of short-circuit current device was zero when electric power system normally moved; Can improve the breaker arc extinguishing performance, the circuit breaker rupturing capacity is improved, and the quenching time of circuit breaker cutting-off of short-circuit electric current reduces; Device volume reduces, manufacturing cost reduces, method is simpler.
Description of drawings
Fig. 1 representes the apparatus structure and the connected mode of cutting-off of short-circuit electric current;
Short circuit current waveform when Fig. 2 representes to close high-voltage switch gear;
Short circuit current waveform when Fig. 3 representes to break off high-voltage switch gear.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
The structure and the connected mode of the device of cutting-off of short-circuit electric current are as shown in Figure 1.High-voltage switch gear K is with after magnetic saturation reactor L is parallelly connected, and F connects with circuit breaker Q.The device series connection of cutting-off of short-circuit electric current inserts current supply circuit.When electric power system normally moved, high-voltage switch gear was closed, breaker closing, and the current circuit conducting, electric power system normal duty electric current flows through from circuit breaker and high-voltage switch gear.The device of cutting-off of short-circuit electric current does not have loss.
During Power System Shortcuts, short circuit current is as shown in Figure 2.The device of cutting-off of short-circuit electric current is received the trip signal of relaying protection, the high-voltage switch gear of disconnecting apparatus at first, and the magnetic saturation reactor of handle assembly drops into the short circuit current loop.No longer through high-voltage switch gear, short circuit current is transferred to the magnetic saturation reactor parallelly connected with high-voltage switch gear to short circuit current, circulates through magnetic saturation reactor.When around the short circuit current zero crossing, arriving smaller or equal to 2 milliseconds of regions greater than 0, the closed loop iron core of magnetic saturation reactor is unsaturated, and the magnetic saturation reactor impedance is the excitatory impedance of approach infinity, and the short circuit current of this section is close to zero; When the short circuit current zero crossing was on every side beyond the regions, the closed loop iron core of magnetic saturation reactor was saturated, and the magnetic saturation reactor impedance is the leakage field impedance that is close to zero, and the short circuit current of this section is not changed.Waveform behind the magnetic saturation reactor limiting short-circuit current is as shown in Figure 3.
The magnetic saturation reactor coil turn is many, when iron core is big, the magnetic saturation reactor iron core is difficult for saturated; Advantage is a limiting short-circuit current significantly; Shortcoming is that equipment volume is big, cost is high.The magnetic saturation reactor coil turn is few, iron core hour, and magnetic saturation reactor is prone to saturated; Shortcoming is that the limiting short-circuit current effect is limited; Advantage is that equipment volume reduces, cost reduces.No matter magnetic saturation reactor coil turn what, iron core size, the current value of section all can reduce around the short circuit current zero crossing place; The magnetic saturation reactor coil turn is few, iron core is little, and the time section of little current value is short around the short circuit current zero crossing; The magnetic saturation reactor coil turn is many, iron core is big, and the time section of little current value is long around the short circuit current zero crossing.For the balance various requirement, selecting the short circuit current zero crossing to arrive smaller or equal to 2 milliseconds greater than 0 on every side is the time section of little current value.Like this, the volume of magnetic saturation reactor and price are less.
Magnetic saturation reactor is close to zero to the current value smaller or equal to 2 milliseconds of sections greater than 0 around making short circuit current zero crossing place.At this moment, circuit breaker cutting-off of short-circuit electric current can reduce circuit breaker arc-gap voltage recovery process, thereby improves the arc extinguishing ability of circuit breaker.Can improve the capacity that circuit breaker cuts off electric current; Shorten arc extinguishing time, circuit breaker is hopeful promptly to cease arc through a zero crossing.
Break off high-voltage switch gear, when dropping into the short circuit current loop to magnetic saturation reactor, circuit has transient process.The inductance L of transient process and magnetic saturation reactor coil is relevant with the ratio L/R of resistance R.L/R is big, and transient process is long; L/R is little, and transient process is short.When dropping into the short circuit current loop to magnetic saturation reactor, hope that circuit has little transient process.The resistance of magnetic saturation reactor coil is big, can reduce transient process.So magnetic saturation reactor coil of the present invention needn't adopt the conductor coiling of small resistor rate as other magnetic saturation reactor coils, can select conductor coiling on the contrary than the big resistivity of other magnetic saturation reactor coils, range of choice is big.Because magnetic saturation reactor is not worked when electric power system normally moves; Only when electric power system fault, just drop into; And short circuit current is excised by circuit breaker soon; So the diameter of magnetic saturation reactor coil can be smaller, further improve the resistance and reduction magnetic saturation reactor manufacturing cost of coil.In case of necessity, but the magnetic saturation reactor series resistance, the transient process when further reducing to drop into magnetic saturation reactor.
In order to improve the switch transient characterisitics of high-voltage switch gear, the high-voltage switch gear two ends can parallelly connected again one group of Resistor-Capacitor Unit.
The circuit breaker dynamic/static contact loop magnetic saturation reactor of having connected can reduce circuit breaker and block overvoltage, can improve the characteristic that circuit breaker cuts off capacity current.
If use magnetic saturation reactor instead air core reactor, but limiting short-circuit current also can improve the circuit breaker rupturing capacity.Just, volume is bigger, and transient process is relatively poor.
Elder generation's high jump compresses switch, and then jumping circuit breaker effect is better.But for further simplified apparatus, high-voltage switch gear and circuit breaker also can trip simultaneously.Like this, two groups of moving contacts of original circuit breaker capable of using, one group as circuit breaker, and another is organized as switch.Like this, need only the wherein one group of moving contact that is parallel to magnetic saturation reactor original circuit breaker.Can further reduce equipment, reduce investment.
If the mechanical structure to two groups of moving contacts of original circuit breaker is transformed; Two groups of moving contacts that become original circuit breaker move simultaneously and successively move into two groups of moving contacts; And the moving contact of action earlier as high-voltage switch gear of the present invention, the moving contact of back action is as circuit breaker of the present invention.Can simplify enforcement of the present invention, can improve the mechanical action speed of former circuit breaker, reduce circuit breaker cutting-off of short-circuit electric current required time.
When connecting current supply circuit, the high-voltage switch gear that can close earlier closes circuit breaker again.
The device and method of said cutting-off of short-circuit electric current can manufacture and design with prior art, can realize that fully broad prospect of application is arranged.
Claims (1)
1. the device of a cutting-off of short-circuit electric current, it comprises: circuit breaker, high-voltage switch gear, magnetic saturation reactor is characterized in that, connects with circuit breaker after said high-voltage switch gear and the magnetic saturation reactor parallel connection, series connection inserts current supply circuit again;
When electric power system normally moved, high-voltage switch gear was closed, breaker closing;
When electric power system is short-circuited, when needing cutting-off of short-circuit electric current, the high-voltage switch gear of first tripper drops into the short circuit current loop to magnetic saturation reactor; Tripping circuit breaker then, thereby cutting-off of short-circuit electric current;
Wherein, After magnetic saturation reactor drops into the short circuit current loop; When around the short circuit current zero crossing, arriving smaller or equal to 2 milliseconds of regions greater than 0; The closed loop iron core of magnetic saturation reactor is unsaturated, and the magnetic saturation reactor impedance is the excitatory impedance of approach infinity, and the short circuit current of this section is close to zero; When the short circuit current zero crossing was on every side beyond the regions, the closed loop iron core of magnetic saturation reactor was saturated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101921053A CN101820170B (en) | 2010-06-07 | 2010-06-07 | Device and method for cutting off short-circuit current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101921053A CN101820170B (en) | 2010-06-07 | 2010-06-07 | Device and method for cutting off short-circuit current |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101820170A CN101820170A (en) | 2010-09-01 |
| CN101820170B true CN101820170B (en) | 2012-06-27 |
Family
ID=42655157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101921053A Expired - Fee Related CN101820170B (en) | 2010-06-07 | 2010-06-07 | Device and method for cutting off short-circuit current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101820170B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136728B (en) * | 2011-01-21 | 2013-04-03 | 山东大学 | Flexible combiner and control method thereof |
| JP5577289B2 (en) * | 2011-03-30 | 2014-08-20 | アズビル株式会社 | Positioner |
| CN106385018B (en) * | 2016-10-27 | 2019-04-23 | 华中科技大学 | A kind of short-circuit fault current limiter |
| CN114784764B (en) * | 2022-06-01 | 2023-05-16 | 安徽一天电气技术股份有限公司 | Arc protection system and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3152282A (en) * | 1960-10-26 | 1964-10-06 | Bbc Brown Boveri & Cie | Short-circuit limiting device |
| CN1885664A (en) * | 2006-06-01 | 2006-12-27 | 上海交通大学 | Bias bridge type short circuit current limiter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3099438B2 (en) * | 1991-07-31 | 2000-10-16 | 株式会社明電舎 | Circuit breaker short circuit test method |
| JPH0698470A (en) * | 1992-09-09 | 1994-04-08 | Yaskawa Electric Corp | Operating method of ac power generator installation |
-
2010
- 2010-06-07 CN CN2010101921053A patent/CN101820170B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3152282A (en) * | 1960-10-26 | 1964-10-06 | Bbc Brown Boveri & Cie | Short-circuit limiting device |
| CN1885664A (en) * | 2006-06-01 | 2006-12-27 | 上海交通大学 | Bias bridge type short circuit current limiter |
Non-Patent Citations (2)
| Title |
|---|
| JP平5-34421A 1993.02.09 |
| JP平6-98470A 1994.04.08 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101820170A (en) | 2010-09-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2014309019B2 (en) | Fast Switch Fault Current Limiter and Current Limiter System | |
| CN101521373B (en) | Device and method for limiting short-circuit current | |
| Leung | Surge protection for power grids | |
| CN101820170B (en) | Device and method for cutting off short-circuit current | |
| CN202353174U (en) | Combined protector of high-voltage current limiting fuse | |
| CN102035197B (en) | Three-phase current limiting device and method | |
| CN201181682Y (en) | Multifunctional small circuit breaker | |
| CN203574379U (en) | Segregated-phase synchronized switching control device | |
| CN202839447U (en) | Intelligent vortex touch high-speed switch | |
| CN108448551A (en) | A kind of exchange current limiter and its current-limiting method | |
| CN201936800U (en) | Outdoor high-voltage intelligent type permanent magnet vacuum switch | |
| CN209184242U (en) | It is a kind of to dispatch controllable power network neutral point earthing or grounding means | |
| CN111863465A (en) | Double-station circuit breaker, direct-current combined electrical apparatus applied to double-station circuit breaker and working method of double-station circuit breaker | |
| CN212570907U (en) | Time-delay action electromagnet and circuit breaker using same | |
| CN201773754U (en) | High-capacity vacuum circuit breaker for protecting short-circuit impact generator used in testing station | |
| CN212365903U (en) | Double-channel circuit breaker and overcurrent protection system | |
| CN101217078B (en) | A permanent magnetic actuator vacuum circuit breaker assembly with series resistance | |
| CN201611763U (en) | Intelligent type fast current-limiting protection device with large capacity | |
| CN208316291U (en) | A kind of magnetic flux restricted type current-limiting apparatus | |
| CN113555857A (en) | Rapid fusing device based on arc voltage enhanced transfer | |
| CN105845402A (en) | Variable-impedance transformer | |
| CN2469548Y (en) | High-speed current-limiting protector for resistance variety | |
| CN114267559B (en) | A quick switch formula fault current limiting device for superhigh pressure system | |
| CN203761019U (en) | Rapid current-limiting fuse of offshore platform electrical network | |
| CN204130426U (en) | Current transformer ratio switching device shifter in a kind of primary cut-out |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120627 Termination date: 20150607 |
|
| EXPY | Termination of patent right or utility model |