CN101752148B - Circuit breaker with selectivity - Google Patents
Circuit breaker with selectivity Download PDFInfo
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- CN101752148B CN101752148B CN200810182967.0A CN200810182967A CN101752148B CN 101752148 B CN101752148 B CN 101752148B CN 200810182967 A CN200810182967 A CN 200810182967A CN 101752148 B CN101752148 B CN 101752148B
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Abstract
The invention provides a circuit breaker used in a distribution system, comprising a circuit breaker loop which comprises an overload release, a magnetic release system, a main contact, an auxiliary contact and an operation mechanism, wherein the operation mechanism is used for controlling the closure or cutting off of the main contact and the auxiliary contact under the conditions of the normal working and the overload fault. The circuit breaker also comprises an electronic release accessory loop comprising a selective resistor and an electronic release which are connected in series, wherein the selective resistor and the electronic release are connected with an input circuit part connected to the first electrode of the circuit breaker in series and at least comprising the main contact and the magnetic release system in parallel. Under the condition of a short-circuit fault, the main contact is cut off under the pushing of the magnetic release system so that short-circuit current passes through the auxiliary contact, the selective resistor and the electronic release, the electronic release selectively controls the operation mechanism according to the elimination of the short-circuit fault in the preset delay time, and furthermore, the operation mechanism controls the main contact and the auxiliary contact to carry out corresponding closing or cutting-off operation.
Description
Technical field
The present invention relates to a kind of circuit breaker; particularly; relate to a kind of low pressure miniature circuit breaker that the 3 segment fault protections that comprise overload protection, short circuit delay protection, short circuit instantaneous protection can be provided, to realize the selectivity to the subordinate's terminal miniature circuit breaker in distribution network.
Background technology
Along with the development of electric automatization, Mini-type direct current break has become a kind of electrical equipment being widely used in low pressure Terminal Power Distribution System.It can guarantee connection and disconnection under the desired rated current of various users, voltage and load conventionally.In circuit, have any abnormal failure (for example overload or short circuit), thereby it can, by moving contact and fixed contact are disconnected to protected circuit, can make load completely and isolated from power like this.
At present conventional miniature circuit breaker only provides 2 segment protect characteristics, i.e. overload protection and short circuit instantaneous protection, and short circuit short time-delay protective value is not provided, more can not realize the selectivity of the protection action in Terminal Power Distribution System.Therefore when fault occurs, often there is miniature circuit breaker overstep tripping or action simultaneously.The continuity that this has just greatly affected various distribution system power supplies, has especially greatly affected the continuity that dwelling house power distribution system is powered.
So; need to have a kind of can provide to have comprise overload protection, short circuit delay protection, short circuit instantaneous protection at the miniature circuit breaker of 3 interior segment protects; to realize the selectivity to the subordinate's terminal miniature circuit breaker in distribution network, and make the distribution system power supply can be reliable and stable.
Summary of the invention
For above-mentioned shortcoming and defect, object of the present invention is exactly to realize the above-mentioned miniature circuit breaker with 3 segment protect characteristics.
Band selectivity miniature circuit breaker of the present invention has adopted at present widely used electronic trip unit technology in breaker of plastic casing; electronic trip unit can be realized short circuit delay protection characteristic, and have working stability, accuracy high, can detection failure electric current, QA advantage.
According to one aspect of the invention, the circuit breaker using in a kind of distribution system is provided, comprise circuit breaker loop, described circuit breaker loop comprises overload release, magnetic tripping system, the main contact on the circuit of first utmost point that is connected on circuit breaker, described circuit breaker loop also comprises auxiliary contact and operating mechanism (4), and described operating mechanism is controlled the closed of main contact and auxiliary contact or cuts off in the normal work of distribution system and overload fault situation.Described circuit breaker also comprises: electronics dropout annex loop, described electronics dropout annex loop comprises selectivity resistance and the electronic trip unit being connected in series, and described selectivity resistance and electronic trip unit are in parallel to circuit part below: input circuit part extremely relevant with circuit breaker first, that at least comprise main contact and magnetic tripping system.Wherein in distribution system short trouble situation, main contact disconnects under the promotion of magnetic tripping system, make short circuit current flow through described auxiliary contact, selectivity resistance and electronic trip unit, described electronic trip unit is according to whether eliminating optionally control operation mechanism in scheduled delay internal short-circuit fault, and then operating mechanism is controlled main contact and auxiliary contact optionally carries out corresponding closure or rupturing operation.
Wherein, electronic trip unit comprises: reference power supply produces circuit, generates the required power supply of an electronic trip unit job; Signal detecting part, detects the short circuit current signal in circuit breaker; Signal amplifier, the short circuit current signal that reception signal detecting part detects also amplifies processing; Signal comparator, compares the output signal of signal amplifier and a predetermined threshold level; Executive component, for carrying out the dropout action of this electronic trip unit; And chip microprocessor, receive the output signal of signal comparator, startup postpones release action the processing of one scheduled time, the output signal of analytic signal comparator is to judge whether short trouble is eliminated, if be wherein eliminated in predetermined internal short-circuit fault time of delay, main contact is again closed, and chip microprocessor does not trigger the executive component action of threading off; If after predetermined delay time, short trouble is not also eliminated, chip microprocessor output control signal is to executive component, and executive component is according to the action of threading off of the output signal of chip microprocessor.
Wherein, described auxiliary contact is connected to described first utmost point with circuit breaker and forms second of loop and extremely go up, and described overload release is included in the input circuit part of described circuit breaker; Wherein, described electronics dropout annex loop also comprises: power supply, is used to electronic trip unit power supply; And auxiliary operation mechanism, under the triggering of electronic trip unit, carry out auxiliary tripping work, with the dropout action of control operation mechanism.
Wherein, described auxiliary contact and selectivity resistance and electronic trip unit are connected in series in described first of circuit breaker and extremely go up.
Wherein, described first utmost point of circuit breaker is the L utmost point, and described second utmost point of circuit breaker is the N utmost point.
Wherein, described overload release is selected bimetal leaf.
Wherein, signal detecting part is the current measuring element based on Hall effect.
According to technique scheme of the present invention, because the different faults type for distribution system provides optionally protected mode, therefore can guarantee the continuity of power supply.According to technique scheme of the present invention, only by the circuit breaker of the place's upper level that breaks down, eliminate fault; Improve the short circuit breaking capacity of miniature circuit breaker simultaneously.
Accompanying drawing explanation
By the detailed description to example embodiment below in conjunction with accompanying drawing, will understand better the present invention.It should be clearly understood that described example embodiment is only as explanation and example, and the invention is not restricted to this.The spirit and scope of the present invention are only limited by the particular content of appended claims.Brief description of drawings is described below, wherein:
Fig. 1 is the structural principle schematic diagram of 2 utmost point selectivity circuit breakers of the first example embodiment according to the present invention;
Fig. 2 is the structural principle schematic diagram of 1 utmost point selectivity circuit breaker of the second example embodiment according to the present invention; And
Fig. 3 is the structural representation of the electronic trip unit that uses in the above embodiment of the present invention.
Embodiment
To introduce in detail example embodiment of the present invention now, its example is shown in the drawings, all the identical identical element of reference numerals designate in accompanying drawing.Embodiment is described with reference to the accompanying drawings with explanation the present invention.
Fig. 1 is the structural principle schematic diagram of 2 utmost point selectivity circuit breakers of the first example embodiment according to the present invention.
As shown in Figure 1,2 utmost point selectivity circuit breakers according to the present invention comprise 2 current circuits in parallel: circuit breaker loop 100 and electronics dropout annex loop 200.
Circuit breaker loop 100 mainly comprises overload release 1, magnetic tripping system 2, main contact 3, auxiliary contact 5, operating mechanism 4.
Electronics dropout annex loop 200 comprises selectivity resistance 6, electronic trip unit 7, power supply 8 and auxiliary operation mechanism 9.
The overload release 1 in circuit breaker loop 100, main contact 3, magnetic tripping system 2 are connected on the circuit of a utmost point of circuit breaker successively, are preferably connected on the L polar curve road of circuit breaker.Overload release 1 can select conventional bimetal leaf to realize.
Auxiliary contact 5 is connected on the circuit of another utmost point of circuit breaker, is preferably connected on the N polar curve road of circuit breaker.
After 7 series connection of selectivity resistance 6 in electronics dropout annex loop 200, electronic trip unit with the overload release 1 of connecting in circuit breaker loop 100, main contact 3, magnetic tripping system 2, be in parallel.Power supply L, the N utmost point that power supply 8 can directly connect from circuit breaker obtain, to be electronic trip unit 7 power supplies.Auxiliary operation mechanism 9 carries out auxiliary tripping work under the triggering of electronic trip unit 7.
Operating mechanism 4 is controlled disconnection or the closed procedure of main contact 3 and auxiliary contact 5 under the promotion of overload release 1 or under operator's manual operation.In addition operating mechanism 4 carries out dropout work under can also triggering in the auxiliary tripping operation of auxiliary operation mechanism 9.
During the fault that is short-circuited in distribution system, 2 utmost point selectivity circuit breakers according to the present invention are inserted into current circuit by the selectivity resistance 6 that is arranged in electronics dropout annex loop 200, and then can greatly improve current limiting performance and the short circuit breaking capacity of circuit breaker.
Describe particularly below according to the specific works principle of 2 utmost point selectivity circuit breakers of the present invention.
When there is no fault, while normally working, main contact 3 and auxiliary contact 5 are all closed.User is by operating grip band pneumatic operating mechanism 4, can according to expectation come closed, disconnect main contact 3 and auxiliary contact 5, and then connect, cut off the electricity supply with load between be connected.
When load generation overload fault, overload release 1 can detect fault, and promotes operating mechanism 4 action of threading off, and operating mechanism 4 is understood disconnection main contact 3 and auxiliary contacts 5, and then cut off the electricity supply with load between be connected, the impact of the overload fault of getting rid of load on distribution system.
When being short-circuited fault, magnetic tripping system 2 can detect fault current, and promoting main contact 3 disconnects, after main contact 3 disconnects, short circuit current is just by subsidiary loop (by selectivity resistance 6, electronic trip unit 7) and N utmost point return line (being auxiliary contact 5), and the electronic trip unit 7 in subsidiary loop is started working, and it can realize certain time delay, if excised by subordinate's circuit breaker at this section of delay time internal fault, main contact 3 can be again closed.If after delay time, short trouble is not also eliminated, electronic trip unit 7 can trigger auxiliary operation mechanisms 9 action of threading off, auxiliary operation mechanism 9 can disconnect the auxiliary contact on N utmost point return line 5 with pneumatic operating mechanism 4, make main contact 3 in open position simultaneously, thereby make being connected between the thorough deenergization of 2 utmost point selectivity circuit breaker and load, only have moving closed this 2 utmost point selectivity circuit breaker again of armrest.
Fig. 2 is the structural principle schematic diagram of 1 utmost point selectivity circuit breaker of the second example embodiment.
As shown in Figure 2,1 utmost point selectivity circuit breaker according to the present invention comprises 2 current circuits in parallel: circuit breaker loop 100 and electronics dropout annex loop 200.
Circuit breaker loop 100 mainly comprises overload release 1, magnetic tripping system 2, main contact 3, auxiliary contact 5, operating mechanism 4.
Electronics dropout annex loop 200 comprises selectivity resistance 6 and electronic trip unit 7.
The overload release 1 in circuit breaker loop 100, magnetic tripping system 2, main contact 3 are connected on the circuit of a utmost point of circuit breaker successively, are preferably connected on the L polar curve road of circuit breaker.Overload release 1 can select conventional bimetal leaf to realize.
Auxiliary contact 5 is composed in series subsidiary loop with electronics dropout annex loop 200, and this subsidiary loop is in parallel with the magnetic tripping system 2 of connecting in circuit breaker loop 100, main contact 3, as shown in Figure 2.
Operating mechanism 4 is controlled disconnection or the closed procedure of main contact 3 and auxiliary contact 5 under the promotion of overload release 1 or under operator's manual operation.In addition operating mechanism 4 can also carry out dropout work under the triggering of electronic trip unit 7.
During the fault that is short-circuited in distribution system, 1 utmost point selectivity circuit breaker according to the present invention is inserted into current circuit by the selectivity resistance 6 that is arranged in electronics dropout annex loop 200, and then can greatly improve current limiting performance and the short circuit breaking capacity of circuit breaker.
Describe particularly below according to the specific works principle of 1 utmost point selectivity circuit breaker of the present invention.
When there is no fault, while normally working, main contact 3 and auxiliary contact 5 are all closed.User is by operating grip band pneumatic operating mechanism 4, can according to expectation come closed, disconnect main contact 3 and auxiliary contact 5, and then connect, cut off the electricity supply with load between be connected.
When load generation overload fault, overload release 1 can detect fault, and promotes operating mechanism 4 action of threading off, and operating mechanism 4 is understood disconnection main contact 3 and auxiliary contacts 5, and then cut off the electricity supply with load between be connected, the impact of the overload fault of getting rid of load on distribution system.
When being short-circuited fault, magnetic tripping system 2 can detect fault current, and promoting main contact 3 disconnects, after main contact 3 disconnects, short circuit current is just started working by subsidiary loop (by auxiliary contact 5, electronic trip unit annex loop 200), electronic trip unit 7 in subsidiary loop can be realized certain time delay, if excised by subordinate's circuit breaker at this section of delay time internal fault, main contact 3 can be again closed.If after delay time, short trouble is not also eliminated, electronic trip unit 7 can trigger action mechanism 4 carry out dropout work, operating mechanism 4 can drive auxiliary contact 5 to disconnect, make main contact 3 in open position simultaneously, thereby make being connected between the thorough deenergization of 1 utmost point selectivity circuit breaker and load, only have moving closed this 1 utmost point selectivity circuit breaker again of armrest.
Fig. 3 is the structural representation of the electronic trip unit 7 that uses in the above embodiment of the present invention.
The electronic trip unit 7 using in the embodiment of the present invention comprises: signal detecting part 71, signal amplifier 72, signal comparator 73, power supply unit 74, rectifier filter 75, voltage regulation adjustor 76, chip microprocessor 77 and executive component 78.Wherein power supply unit 74, rectifier filter 75, voltage regulation adjustor 76 form a reference power supply production part, produce the reference power supply that electronic trip unit 7 carries out work.
Power supply unit 74 can extremely power taking source signal and then produce original reference power supply signal from the corresponding of power circuit, the signal that also can detect according to signal detecting part 71 exports to produce original reference power supply signal, this original reference power supply signal is input in voltage regulation adjustor 76 after processing via the rectifying and wave-filtering of rectifier filter, and the signal of 76 pairs of outputs of voltage regulation adjustor carries out voltage stabilizing adjusting to generate last reference power supply to electronic trip unit 7 power supplies.
Signal detecting part 71 is preferably the current measuring element based on Hall effect.The short circuit current that signal detecting part 71 detects in circuit breaker, and detected short circuit current signal is offered to signal amplifier 72 amplify processing, the short circuit current signal after the amplification of signal amplifier 72 outputs compares with a predetermined threshold level in signal comparator 73.The output signal of signal comparator 73 offers chip microprocessor 77.Signal detecting part 71 also can produce original reference power supply signal to power supply unit 74.
Chip microprocessor 77, after receiving the output signal of signal comparator 73, first starts the processing that release action is postponed to a scheduled time, and then the output signal of analytic signal comparator 73 is to judge whether short trouble is eliminated.If be eliminated in predetermined internal short-circuit fault time of delay, main contact 3 can be again closed, and chip microprocessor 77 does not trigger executive component 78 action of threading off; If after predetermined delay time, short trouble is not also eliminated, chip microprocessor 77 output control signals are to executive component 78, executive component 78 is according to the action of threading off of the output signal of chip microprocessor 77, it is the executive component 78Hui trigger action mechanism 4 of electronic trip unit 7, operating mechanism 4 can drive auxiliary contact 5 to disconnect, make main contact 3 in open position simultaneously, thereby make being connected between the thorough deenergization of circuit breaker and load, only have the moving close circuit breaker again of armrest.
The above-mentioned electronic trip unit using in the embodiment of the present invention can be realized short circuit delay protection characteristic, and have working stability, accuracy high, can detection failure electric current, QA advantage.Reached the reliable selective protection to distribution system.
Selectivity circuit breaker according to the present invention is by inserting selectivity resistance in short trouble loop, and limiting short-circuit current well improves the short circuit breaking capacity of product; By using electronic trip unit, fault current can be detected exactly, reliably, stably realize short time delay function.Selectivity breaker structure of the present invention is simple, compact, and whole circuit breaker only has an operating mechanism or only has a main operating mechanism, thereby has guaranteed the action message of operating mechanism.Selectivity circuit breaker of the present invention has reduced near the time of staying of electric arc main contact, reduces the galvano-cautery of electric arc to dynamic/static contact, improves the electrical endurance of product.
Although illustrated and described the example embodiment of the present invention of considering, but it will be appreciated by those skilled in the art that, along with the progress of technology, can make various changes and revise and can replace its element and not deviate from true scope of the present invention with equivalent.
Claims (7)
1. the circuit breaker using in a distribution system, comprise circuit breaker loop, described circuit breaker loop comprises overload release (1), magnetic tripping system (2), the main contact (3) on the circuit of first utmost point that is connected on circuit breaker, described circuit breaker loop also comprises auxiliary contact (5) and operating mechanism (4), described operating mechanism (4) is controlled the closed of main contact (3) and auxiliary contact (5) or cuts off in the normal work of distribution system and overload fault situation
It is characterized in that: described circuit breaker also comprises:
Electronics dropout annex loop, described electronics dropout annex loop comprises selectivity resistance (6) and the electronic trip unit (7) being connected in series, described selectivity resistance (6) and electronic trip unit (7) are in parallel to circuit part below: input circuit part extremely relevant with circuit breaker first, that at least comprise main contact (3) and magnetic tripping system (2)
Wherein in distribution system short trouble situation, main contact (3) disconnects under the promotion of magnetic tripping system (2), make short circuit current flow through described auxiliary contact (5), selectivity resistance (6) and electronic trip unit (7), described electronic trip unit (7) is according to whether eliminating optionally control operation mechanism (4) in scheduled delay internal short-circuit fault, and then operating mechanism (4) is controlled main contact (3) and auxiliary contact (5) optionally carries out corresponding closure or rupturing operation.
2. circuit breaker as claimed in claim 1, is characterized in that electronic trip unit (7) comprising:
Reference power supply produces circuit, generates the required power supply of an electronic trip unit job;
Signal detecting part (71), detects the short circuit current signal in circuit breaker;
Signal amplifier (72), the short circuit current signal that reception signal detecting part (71) detects also amplifies processing;
Signal comparator (73), compares the output signal of signal amplifier (72) and a predetermined threshold level;
Executive component (78), for carrying out the dropout action of this electronic trip unit; And
Chip microprocessor (77), receive the output signal of signal comparator (73), startup postpones release action the processing of one scheduled time, the output signal of analytic signal comparator (73) is to judge whether short trouble is eliminated, if be wherein eliminated in predetermined internal short-circuit fault time of delay, main contact (3) is again closed, and chip microprocessor (77) does not trigger executive component (78) action of threading off; If after predetermined delay time, short trouble is not also eliminated, chip microprocessor (77) output control signal is to executive component (78), and executive component (78) is according to the action of threading off of the output signal of chip microprocessor (77).
3. circuit breaker as claimed in claim 1, is characterized in that
Described auxiliary contact (5) is connected to described first utmost point with circuit breaker and forms second of loop and extremely go up, and
Described overload release (1) is included in the input circuit part of described circuit breaker;
Wherein, described electronics dropout annex loop also comprises:
Power supply (8), is used to electronic trip unit (7) power supply; And
Auxiliary operation mechanism (9) carries out auxiliary tripping work under the triggering of electronic trip unit (7), with the dropout action of control operation mechanism (4).
4. circuit breaker as claimed in claim 1, is characterized in that
Described auxiliary contact (5) is connected in series in described first of circuit breaker with selectivity resistance (6) and electronic trip unit (7) and extremely goes up.
5. circuit breaker as claimed in claim 3, is characterized in that
Described first utmost point of circuit breaker is the L utmost point, and described second utmost point of circuit breaker is the N utmost point.
6. the circuit breaker as described in one of claim 1-4, is characterized in that
Described overload release (1) is selected bimetal leaf.
7. the circuit breaker as described in one of claim 1-4, is characterized in that
Signal detecting part (71) is the current measuring element based on Hall effect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810182967.0A CN101752148B (en) | 2008-12-12 | 2008-12-12 | Circuit breaker with selectivity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810182967.0A CN101752148B (en) | 2008-12-12 | 2008-12-12 | Circuit breaker with selectivity |
Publications (2)
| Publication Number | Publication Date |
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| CN101752148A CN101752148A (en) | 2010-06-23 |
| CN101752148B true CN101752148B (en) | 2014-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200810182967.0A Active CN101752148B (en) | 2008-12-12 | 2008-12-12 | Circuit breaker with selectivity |
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| CN (1) | CN101752148B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102339696B (en) * | 2010-07-15 | 2014-09-24 | 北京翠祥电器元件有限公司 | Circuit breaker with selective protection |
| CN102436982B (en) * | 2011-10-11 | 2014-04-16 | 上海诺雅克电气有限公司 | Breaker for prepaid watt-hour meter |
| GB2520959A (en) | 2013-12-04 | 2015-06-10 | Eaton Ind Netherlands Bv | Semi voltage dependent circuit breaker |
| GB2520961A (en) * | 2013-12-04 | 2015-06-10 | Eaton Ind Netherlands Bv | Automatic reclosing alternating current circuit breaker |
| DE102014008706A1 (en) * | 2014-06-18 | 2015-12-24 | Ellenberger & Poensgen Gmbh | Disconnect switch for DC interruption |
| US9831656B2 (en) * | 2014-12-18 | 2017-11-28 | Eaton Corporation | Circuit interruption apparatus providing automatic reduced arc mode and methods of operating the same |
| CN106207983A (en) * | 2016-08-11 | 2016-12-07 | 现代重工(中国)电气有限公司 | A kind of selective protection system of MCCB moulded case circuit breaker |
| FR3100654B1 (en) * | 2019-09-05 | 2021-09-17 | Schneider Electric Ind Sas | Auxiliary electronic protection module and associated circuit breaker |
| CN114388314B (en) * | 2021-12-24 | 2024-03-12 | 上海京硅智能技术有限公司 | Circuit breaker control system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4486803A (en) * | 1983-05-09 | 1984-12-04 | Square D Company | Electronic system for high amperage circuit interruption apparatus |
| EP1249852A2 (en) * | 2001-04-11 | 2002-10-16 | ABB PATENT GmbH | Electrical installation switchgear |
| CN101183781A (en) * | 2007-12-10 | 2008-05-21 | 华中科技大学 | Shunt inductance current-limiting breaker |
| CN201340826Y (en) * | 2008-12-12 | 2009-11-04 | 施耐德电器工业公司 | Circuit breaker with selectivity |
-
2008
- 2008-12-12 CN CN200810182967.0A patent/CN101752148B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4486803A (en) * | 1983-05-09 | 1984-12-04 | Square D Company | Electronic system for high amperage circuit interruption apparatus |
| EP1249852A2 (en) * | 2001-04-11 | 2002-10-16 | ABB PATENT GmbH | Electrical installation switchgear |
| CN101183781A (en) * | 2007-12-10 | 2008-05-21 | 华中科技大学 | Shunt inductance current-limiting breaker |
| CN201340826Y (en) * | 2008-12-12 | 2009-11-04 | 施耐德电器工业公司 | Circuit breaker with selectivity |
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| Publication number | Publication date |
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| CN101752148A (en) | 2010-06-23 |
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