CN101752148A - Circuit breaker with selectivity - Google Patents
Circuit breaker with selectivity Download PDFInfo
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- CN101752148A CN101752148A CN200810182967A CN200810182967A CN101752148A CN 101752148 A CN101752148 A CN 101752148A CN 200810182967 A CN200810182967 A CN 200810182967A CN 200810182967 A CN200810182967 A CN 200810182967A CN 101752148 A CN101752148 A CN 101752148A
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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 faults protection that comprises overload protection, short circuit delay protection, short circuit instantaneous protection can be provided, to realize selectivity to the subordinate's terminal miniature circuit breaker in the distribution network.
Background technology
Along with the development of electric automatization, the minisize dc circuit breaker has become a kind of electrical equipment that is widely used in the low pressure terminal distribution system.It can guarantee being connected and disconnection under the desired rated current of various users, voltage and the load usually.Any abnormal failure (for example overload or short circuit) is arranged, thereby it can make the complete and isolated from power of load like this by moving contact and fixed contact are disconnected protected circuit in circuit.
Miniature circuit breaker at present commonly used 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 the terminal distribution system.Therefore when fault takes place, miniature circuit breaker overstep tripping or action simultaneously often appear.The continuity that this has just greatly influenced various distribution system power supplies has especially greatly influenced the continuity that the house power distribution system powers.
So; need a kind of can provide to have comprise overload protection, short circuit delay protection, short circuit instantaneous protection miniature circuit breaker at 3 interior segment protects; realizing selectivity, and make the distribution system power supply can be reliable and stable to the subordinate's terminal miniature circuit breaker in the distribution network.
Summary of the invention
At above-mentioned shortcoming and defect, purpose of the present invention is exactly to realize the above-mentioned miniature circuit breaker that has 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 height, can the detection failure electric current, QA advantage.
According to one aspect of the invention, the circuit breaker that uses in a kind of distribution system is provided, comprise the 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 cut off under distribution system operate as normal 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 that is connected in series, the selectivity resistance of described series connection is extremely relevant with electronic trip unit and circuit breaker first comprises main contact at least, and the input circuit part of magnetic tripping system is in parallel.Wherein under 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, whether described electronic trip unit basis eliminates 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 the circuit breaker; Signal amplifier, the short circuit current signal that the received signal detection part is detected also carries out processing and amplifying; Signal comparator compares the output signal and a predetermined threshold value level of signal amplifier; Executive component is used to carry out the dropout action of this electronic trip unit; And chip microprocessor, the output signal of received signal comparator, startup postpones the release action processing of one scheduled time, the output signal of analytic signal comparator is to judge whether short trouble is eliminated, if wherein be eliminated in predetermined internal short-circuit fault time of delay, then main contact is closed again, and chip microprocessor does not trigger the executive component action of threading off; If behind predetermined delay time, short trouble also is not eliminated, then chip microprocessor output control signal is given 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 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 the 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 for use.
Wherein, signal detecting part is the current measuring element based on Hall effect.
According to technique scheme of the present invention,, therefore can guarantee the continuity of powering owing to provide optionally protected mode at the different faults type of distribution system.According to technique scheme of the present invention, only eliminate fault by the circuit breaker of the place's upper level that breaks down; Improve the short circuit breaking capacity of miniature circuit breaker simultaneously.
Description of drawings
By below in conjunction with the detailed description of accompanying drawing, will understand the present invention better to example embodiment.It should be clearly understood that described example embodiment only is as an illustration 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 first example embodiment according to the present invention;
Fig. 2 is the structural principle schematic diagram of 1 utmost point selectivity circuit breaker of 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 example embodiment of the present invention in detail now, its example is shown in the drawings, all the identical identical element of reference numerals designate in the 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 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 the current circuit of 2 parallel connections: circuit breaker loop 100 and electronics dropout annex loop 200.
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, preferably are connected on the L polar curve road of circuit breaker.Overload release 1 can select for use bimetal leaf commonly used to realize.
After 7 series connection of selectivity resistance 6 in the electronics dropout annex loop 200, electronic trip unit with circuit breaker loop 100 in connect overload release 1, main contact 3, magnetic tripping system 2, be in parallel.Power supply 8 can directly obtain from power supply L, the N utmost point that circuit breaker connected, so that be electronic trip unit 7 power supplies.Auxiliary operation mechanism 9 carries out auxiliary tripping work under the triggering of electronic trip unit 7.
When being short-circuited fault in the distribution system, the selectivity resistance 6 that 2 utmost point selectivity circuit breakers according to the present invention will be arranged in electronics dropout annex loop 200 is inserted into current circuit, and then can improve the current limiting performance and the short circuit breaking capacity of circuit breaker greatly.
Concrete operation principle according to 2 utmost point selectivity circuit breakers of the present invention is described below particularly.
When not having fault, operate as normal, main contact 3 and auxiliary contact 5 all are closed.The user drives operating mechanism 4 by operating grip, 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 can disconnection main contact 3 and auxiliary contacts 5, and then cut off the electricity supply with load between be connected, get rid of of the influence of the overload fault of load to 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 (promptly 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 the subsidiary loop is started working, and it can realize certain time-delay, if excised by subordinate's circuit breaker at this section delay time internal fault, main contact 3 can be closed again.If through behind the delay time, short trouble also is not eliminated, electronic trip unit 7 can trigger auxiliary operation mechanisms 9 action of threading off, auxiliary operation mechanism 9 can drive operating mechanism 4 auxiliary contact on the N utmost point return line 5 is disconnected, make main contact 3 be in open position simultaneously, thereby make being connected between the thorough deenergization of 2 utmost point selectivity circuit breakers and the load, having only that armrest is moving could closed again this 2 utmost point selectivity circuit breaker.
Fig. 2 is the structural principle schematic diagram of 1 utmost point selectivity circuit breaker of second example embodiment.
As shown in Figure 2,1 utmost point selectivity circuit breaker according to the present invention comprises the current circuit of 2 parallel connections: circuit breaker loop 100 and electronics dropout annex loop 200.
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, preferably are connected on the L polar curve road of circuit breaker.Overload release 1 can select for use bimetal leaf commonly used to realize.
When being short-circuited fault in the distribution system, the selectivity resistance 6 that 1 utmost point selectivity circuit breaker according to the present invention will be arranged in electronics dropout annex loop 200 is inserted into current circuit, and then can improve the current limiting performance and the short circuit breaking capacity of circuit breaker greatly.
Concrete operation principle according to 1 utmost point selectivity circuit breaker of the present invention is described below particularly.
When not having fault, operate as normal, main contact 3 and auxiliary contact 5 all are closed.The user drives operating mechanism 4 by operating grip, 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 can disconnection main contact 3 and auxiliary contacts 5, and then cut off the electricity supply with load between be connected, get rid of of the influence of the overload fault of load to 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 (promptly by auxiliary contact 5, electronic trip unit annex loop 200), electronic trip unit 7 in the subsidiary loop can be realized certain time-delay, if excised by subordinate's circuit breaker at this section delay time internal fault, main contact 3 can be closed again.If through behind the delay time, short trouble also is not eliminated, electronic trip unit 7 can trigger action mechanism 4 carry out dropout work, operating mechanism 4 can drive auxiliary contact 5 and disconnect, make main contact 3 be in open position simultaneously, thereby make being connected between the thorough deenergization of 1 utmost point selectivity circuit breaker and the load, having only that armrest is moving could closed again this 1 utmost point selectivity circuit breaker.
Fig. 3 is the structural representation of the electronic trip unit 7 that uses in the above embodiment of the present invention.
Employed electronic trip unit 7 comprises in the embodiment of the invention: 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 are formed a reference power supply production part, produce the reference power supply that electronic trip unit 7 carries out work.
Employed above-mentioned electronic trip unit can be realized short circuit delay protection characteristic in the embodiment of the invention, and have working stability, accuracy height, can the detection failure electric current, QA advantage.Reached reliable selective protection to distribution system.
By insert selectivity resistance in the short trouble loop, limiting short-circuit current well improves the short circuit breaking capacity of product according to selectivity circuit breaker of the present invention; By using electronic trip unit, can detect fault current exactly, reliably, stably realize the short time delay function.Selectivity breaker structure of the present invention is simple, compact, and whole circuit breaker only has an operating mechanism or a main operating mechanism is only arranged, 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.
Though illustrated and described the example embodiment of being considered of the present invention, but it will be appreciated by those skilled in the art that, along with development 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 that uses in the distribution system, comprise the 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 is cut off under distribution system operate as normal 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) that is connected in series, the selectivity resistance (6) of described series connection is extremely relevant with electronic trip unit (7) and circuit breaker first comprises main contact (3) at least, the input circuit part of magnetic tripping system (2) is in parallel
Wherein under 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), whether described electronic trip unit (7) basis eliminates 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 the circuit breaker;
Signal amplifier (72), the short circuit current signal that received signal detection part (71) is detected also carries out processing and amplifying;
Signal comparator (73) compares the output signal and a predetermined threshold value level of signal amplifier (72);
Executive component (78) is used to carry out the dropout action of this electronic trip unit; And
Chip microprocessor (77), the output signal of received signal comparator (73), startup postpones the release action processing of one scheduled time, the output signal of analytic signal comparator (73) is to judge whether short trouble is eliminated, if wherein be eliminated in predetermined internal short-circuit fault time of delay, then main contact (3) is closed again, and chip microprocessor (77) does not trigger executive component (78) action of threading off; If behind predetermined delay time, short trouble also is not eliminated, then chip microprocessor (77) output control signal is given 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 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. as the described circuit breaker of one of claim 1-4, it 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. as the described circuit breaker of one of claim 1-4, it is characterized in that
Described overload release (1) is selected bimetal leaf for use.
7. as the described circuit breaker of one of claim 1-4, it 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 |
|---|---|
| CN101752148A true CN101752148A (en) | 2010-06-23 |
| CN101752148B CN101752148B (en) | 2014-08-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810182967.0A Active CN101752148B (en) | 2008-12-12 | 2008-12-12 | Circuit breaker with selectivity |
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| Country | Link |
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| CN (1) | CN101752148B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102339696A (en) * | 2010-07-15 | 2012-02-01 | 北京翠祥电器元件有限公司 | Circuit breaker with selective protection |
| CN102436982A (en) * | 2011-10-11 | 2012-05-02 | 上海诺雅克电气有限公司 | Breaker for prepaid watt-hour meter |
| WO2015082629A1 (en) * | 2013-12-04 | 2015-06-11 | Eaton Industries (Netherlands) B.V. | Semi voltage dependent circuit breaker |
| WO2015082632A1 (en) * | 2013-12-04 | 2015-06-11 | Eaton Industries (Netherlands) B.V. | Automatic reclosing alternating current circuit breaker |
| 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 |
| US20170098931A1 (en) * | 2014-06-18 | 2017-04-06 | Ellenberger & Poensgen Gmbh | Disconnect switch for direct current interruption |
| CN107004544A (en) * | 2014-12-18 | 2017-08-01 | 伊顿公司 | The circuit interrupting equipment and its operating method of automatic reduction arc mode are provided |
| CN112447455A (en) * | 2019-09-05 | 2021-03-05 | 施耐德电器工业公司 | Auxiliary electronic protection module and related circuit breaker device |
| CN114388314A (en) * | 2021-12-24 | 2022-04-22 | 上海京硅智能技术有限公司 | Circuit breaker control system |
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| 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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| 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 |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102339696A (en) * | 2010-07-15 | 2012-02-01 | 北京翠祥电器元件有限公司 | Circuit breaker with selective protection |
| 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 |
| CN102436982A (en) * | 2011-10-11 | 2012-05-02 | 上海诺雅克电气有限公司 | Breaker for prepaid watt-hour meter |
| 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 |
| US10374410B2 (en) | 2013-12-04 | 2019-08-06 | Eaton Intelligent Power Limited | Automatic reclosing alternating current circuit breaker |
| CN105934858B (en) * | 2013-12-04 | 2019-03-29 | 伊顿工业(荷兰)有限公司 | Automatic reclosing AC circuit breaker |
| CN105934858A (en) * | 2013-12-04 | 2016-09-07 | 伊顿工业(荷兰)有限公司 | Automatic reclosing alternating current circuit breaker |
| WO2015082629A1 (en) * | 2013-12-04 | 2015-06-11 | Eaton Industries (Netherlands) B.V. | Semi voltage dependent circuit breaker |
| WO2015082632A1 (en) * | 2013-12-04 | 2015-06-11 | Eaton Industries (Netherlands) B.V. | Automatic reclosing alternating current circuit breaker |
| US10355471B2 (en) | 2013-12-04 | 2019-07-16 | Eaton Intelligent Power Limited | Semi voltage dependent circuit breaker with earth fault and overcurrent protection |
| US20170098931A1 (en) * | 2014-06-18 | 2017-04-06 | Ellenberger & Poensgen Gmbh | Disconnect switch for direct current interruption |
| US10931093B2 (en) * | 2014-06-18 | 2021-02-23 | Ellenberger & Poensgen Gmbh | Disconnect switch for interupption dc circuit between DC power source and load |
| CN107004544A (en) * | 2014-12-18 | 2017-08-01 | 伊顿公司 | The circuit interrupting equipment and its operating method of automatic reduction arc mode are provided |
| CN107004544B (en) * | 2014-12-18 | 2019-10-08 | 伊顿智能动力有限公司 | The automatic circuit interrupting equipment for reducing arc mode and its operating method are provided |
| 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 |
| CN112447455A (en) * | 2019-09-05 | 2021-03-05 | 施耐德电器工业公司 | Auxiliary electronic protection module and related circuit breaker device |
| CN112447455B (en) * | 2019-09-05 | 2024-05-28 | 施耐德电器工业公司 | Auxiliary electronic protection module and related circuit breaker device |
| CN114388314A (en) * | 2021-12-24 | 2022-04-22 | 上海京硅智能技术有限公司 | Circuit breaker control system |
| CN114388314B (en) * | 2021-12-24 | 2024-03-12 | 上海京硅智能技术有限公司 | Circuit breaker control system |
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