CN102590587A - Device and method for identifying short-circuit current of medium-voltage high-current direct current circuit breaker - Google Patents
Device and method for identifying short-circuit current of medium-voltage high-current direct current circuit breaker Download PDFInfo
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- CN102590587A CN102590587A CN2012100412233A CN201210041223A CN102590587A CN 102590587 A CN102590587 A CN 102590587A CN 2012100412233 A CN2012100412233 A CN 2012100412233A CN 201210041223 A CN201210041223 A CN 201210041223A CN 102590587 A CN102590587 A CN 102590587A
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Abstract
The invention discloses a device and method for identifying short-circuit current of a medium-voltage high-current direct current circuit breaker. The device comprises a signal acquiring circuit, a level comparative judgment circuit, a signal conditioning circuit, a high-speed data acquiring card, a central processing unit (CPU) and a tripping device, wherein the signal acquiring circuit, the level comparative judgment circuit, the signal conditioning circuit, the high-speed data acquiring card, the CPU and the tripping device are sequentially connected in series. In the invention, a protective control device of the medium-voltage high-current direct current circuit breaker can measure the rated current of the medium-voltage high-current direct current circuit breaker in steady state operation, and further can measure the fast rising failure high current, and moreover, the device has the characteristics of large measurement range and high measurement precision. In addition, the device provided by the invention is simple in structure, has the advantages of low implementation cost, small volume, light weight, and easiness in computerization and networking, and is convenient in realizing and wide in promotion and application ranges.
Description
Technical field
The present invention relates to a kind of protection control system that is applied to dc circuit breaker, particularly a kind of middle large current DC circuit breaker short-circuit current recognition device of pressing.
Background technology
Along with the development of direct current generator, electric semiconductor, electrical power storage, renewable energy power generation, fuel cells applications and IT technology, the advantage of direct current supply constantly manifests, and people begin to pay close attention to again the prospect of direct current supply.Getting in touch of DC power-supply system and people's daily life is more and more tightr; Though direct current supply also need solve some problems on the problem that gets into household electronic products market; But the direct current household electrical appliance replace the process that exchanges household electrical appliance comprehensively to be started; In the near future, direct current supply brings great and far-reaching influence not only can for the household electrical appliance production industry, and will become the technology trends that influences whole society's every aspect.In China's scope, all adopted DC power-supply system in many important industries such as city trolley bus, subway, solar electrical energy generation, smelting, chemical industry, stocking, ship electricity, mine at present.The development at present of direct current supply technology very rapidly.
Meanwhile; Along with China's economy develops rapidly and department's modernization progressively such as industry, traffic; Requirement to the electric power system reliability is also more and more stricter; Direct current power load capacity also continues to increase, and thus its relevant switching device and circuit control protection has been proposed increasingly high requirement.Wherein, dc circuit breaker is the assurance of DC power-supply system safe operation, requires it to have fast and reliably cut off the defencive function of DC loop fault electric current.The testing circuit that requires to cooperate with it is highly sensitive, accuracy good, and the signals collecting time is short, and cost is low and can not impact the sensed current major loop.Dc circuit breaker is measured the protection control procedure and is summarized as follows: utilize dc current measurement system the flow through DC current of major loop of on-line monitoring constantly; To collect to such an extent that information is delivered to single-chip microcomputer or industrial computer carries out analysis and judgement; If reach the working value of setting, then send signal instruction and give control circuit by single-chip microcomputer, control circuit sends the instruction of threading off to tripping system then; Tripping system is received tripping immediately behind the trip signal; Electrical apparatus release is successfully realized rapid-releasing, thereby realizes the isolating switch quick acting switching-off, rapidly the disengagement failure electric current.
At present, the common method that adopts of the electric current of measurement DC loop has two kinds.First kind is to utilize shunt to measure.Shunt is exactly the accurate resistance that can pass through big electric current.During measurement with the direct series connection entry loop of shunt, when big electric current passes through shunt, the small voltage of a millivolt level will appear at its two ends.Measure this voltage with the millivolt voltage table, utilize ohm theorem again this voltage to be converted into electric current again, this has just accomplished the measurement of the big electric current of DC loop.But because shunt is direct and current return is connected in series; Along with improving constantly of present electric pressure; The isolating problem that shunt is measured is difficult to all the more solve, and is very important, becomes the main cause that restriction shunt measuring method is used in more the high pressure grading current is measured.Second kind is to utilize Hall current sensor.According to electromagnetic theory, around electromotion straight wire, can produce the magnetic field of inducting, and magnetic field intensity B is directly proportional with alive size.Hall element mainly is through detecting the size of measuring the electric current that flows through conductor indirectly of magnetic field intensity that the conductor surrounding space produces.Because of in magnetic induction density in the iron core in the sensor and the conductor institute alive size linear; And according to Hall effect; It exports the big or small linear of induced voltage and magnetic field intensity sensor, so sensor output voltage promptly within the specific limits can the accurately linear size that reflects electric current in the lead.In this current transformer measuring method, Hall element does not directly contact with circuit and is connected, and this non-contact measurement himself has good measuring accuracy and certain buffer action.And to the electric pressure that constantly raises, the circuit Insulation Problems of sensor measurement also solves easily.In addition, utilize Hall current sensor can DC current to be measured be carried out conversion to satisfy the requirement of automatic checkout system.But continuing to increase of electric load, electric current to be measured constantly increases, in order to satisfy simultaneously the measurement of dc rated current with big current system; If the single utilization Hall element is realized wide range, then its system bulk is excessive, and structure is very complicated; The realization cost is too high; Low cost that is unfavorable for whole detection system and microminiaturized advantage, and precision is difficult to guarantee, thereby be difficult to apply.
Summary of the invention
The objective of the invention is to: design a kind of middle large current DC circuit breaker of pressing and measure the protection control system.This current measurement system comprehensively uses Hall current sensor and Luo-coil, under the rated operational current situation, utilizes Hall current sensor to measure, and under fault heavy impulse current situation, utilizes Luo-coil to measure.
Said Luo-coil is actually an even close air core solenoid on the non magnetic skeleton of annular, and the induction electromotive force of its output is proportional to tested change in current rate.The transmission of electricity gesture of Luo-coil is carried out integration can restore tested DC loop electric current.Because the current transformer that Luo-coil constitutes does not contain iron core; The problems such as measurement inefficacy that when measuring zooming big electric current, do not exist magnetic saturation to bring; So the size of tested electric current is restricted hardly, thereby by the measurement adaptable across transient state, pulse and D.C. high-current.
Said system utilizes Hall element and two kinds of current transformers of the Luo-coil characteristics and scope of application separately; Actual implementation method during measurement is: Hall element and Luo-coil all are enclosed within outside the tested middle straightening stream circuit breaker current return conductors; All belong to non-contact measurement; Do not exist directly with the test loop to be electrically connected, thereby its antijamming capability is strong, its insulating property are easy to realize.
Said Hall element is used for accurately measuring dc circuit breaker loop rated operational current under the stable situation.For guaranteeing unlikely damage when measuring heavy impulse current, select the Hall element of band negative feedback closed loop for use.
Said Luo-coil is used for accurately measuring the big electric current of zooming fault.Because the electromotive force of exporting behind the Luo-coil is the differential signal of the electric current of surveying, thus after need to connect integrator, thereby the current value that reduction is surveyed.
The voltage signal of said Hall element and Luo-coil output is sent into level judging circuit, if less than setting level value, then choose the measurement result of Hall element, otherwise then choose the measurement result of Luo-coil.Being used for the level of comparison sets according to the rated current and the short-circuit current in loop.
Above-mentioned voltage signal is through after the decision circuitry, isolates successively, filtering and processing and amplifying, finally sends into CPU and carries out analyzing and processing.If measure electric current greater than the dropout action tuning current of isolating switch, then CPU sends the instruction of threading off to trip gear, electrical apparatus release is threaded off rapidly.The isolating switch quick acting switching-off.
During can either measuring, this middle pressure large current DC circuit breaker short-circuit current recognition device of the present invention presses the stable state rated operational current of large current DC circuit breaker; Also can measure the big electric current of zooming fault, have the advantages that range is big, system architecture is simple, measuring accuracy is high.Have in addition and realize that cost is low, have advantages such as the microcomputerization of being easy to and networking, volume are little, in light weight, be easy to realize and apply.
Description of drawings
Fig. 1 is that Hall element is measured electric current principle figure;
Fig. 2 is that Luo-coil is measured electric current principle figure;
Fig. 3 is that this middle large current DC circuit breaker short-circuit current recognition device of pressing is measured process flow diagram.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Referring to Fig. 1, Hall element is socketed in outside the Ampereconductors to be measured (for example isolating switch busbar).According to electromagnetic theory, around electromotion straight wire, can produce the magnetic field of inducting, and magnetic field intensity B is directly proportional with alive size.Hall element mainly is through detecting the size of measuring the electric current that flows through conductor indirectly of magnetic field intensity that the conductor surrounding space produces.Because of in magnetic induction density in the iron core in the sensor and the conductor institute alive size linear; And according to Hall effect; It exports the big or small linear of induced voltage and magnetic field sensor, so sensor output voltage promptly within the specific limits can the accurately linear size that reflects electric current in the lead.In this current transformer measuring method, Hall element does not directly contact with circuit or is connected, and this non-contact measurement measuring accuracy is high, and certain buffer action is arranged.And be directed against more voltage levels, its Insulation Problems also solves easily.
Referring to Fig. 2, Luo-coil also is socketed in outside the Ampereconductors to be measured (for example isolating switch busbar).Luo-coil is actually an even close air core solenoid on the non magnetic skeleton of annular, and the induction electromotive force of its output is proportional to tested change in current rate.Luo-coil can only be measured the electric current of variation.The transmission of electricity gesture of Luo-coil is carried out integration can restore tested DC loop electric current.
Referring to Fig. 3, the voltage signal that Hall element and Luo-coil output to is sent into level judging circuit, if less than setting level value, then choose the measurement result of Hall element, otherwise then choose the measurement result of Luo-coil.This voltage signal is sent into amplification, filtering and isolation successively after decision circuitry, be admitted to CPU and carry out analyzing and processing.If this voltage is greater than the dropout of the isolating switch action level of adjusting, then CPU sends the instruction of threading off to tripping system, and electrical apparatus release is threaded off rapidly, isolating switch quick acting switching-off, disengagement failure electric current.
Above content is to combine concrete preferred implementation to further explain that the present invention did; Can not assert that embodiment of the present invention only limits to this; Those of ordinary skill for technical field under the present invention; Under the prerequisite that does not break away from the present invention's design, can also make some simple deduction or replace, all should be regarded as belonging to the present invention and confirm scope of patent protection by claims of being submitted to.
Claims (5)
1. press large current DC circuit breaker short-circuit current recognition device in one kind, it is characterized in that:
Comprise that signal acquisition circuit, level ratio adopt card, CPU and trip gear than decision circuitry, signal conditioning circuit, high speed number;
Said signal acquisition circuit, level ratio are adopted card, CPU and trip gear and are connected successively according to sequencing than decision circuitry, signal conditioning circuit, high speed number.
2. the middle according to claim 1 large current DC circuit breaker short-circuit current recognition device of pressing is characterized in that: said Luo-coil and integrator series connection back compose in parallel signal acquisition circuit with Hall element.
3. the middle according to claim 1 large current DC circuit breaker short-circuit current recognition device of pressing is characterized in that: signal conditioning circuit is formed in said differential amplifier circuit, filtering circuit and buffer circuit series connection back.
4. like the said middle large current DC circuit breaker short-circuit current recognition device of pressing of claim 2; It is characterized in that: said Hall current sensor is measured dc circuit breaker loop rated operational current under the rated operational current situation; Luo-coil is measured the big electric current of zooming fault under the fault heavy impulse current situation; The electromotive force of output is the differential signal of the electric current of surveying, and Luo-coil connects integrator, thus the current value that reduction is surveyed.
5. based on the said middle recognition methods of pressing large current DC circuit breaker short-circuit current recognition device of claim 4, it is characterized in that, comprise the steps:
Said Hall element and Luo-coil all are enclosed within outside the tested middle straightening stream circuit breaker current return conductors, belong to non-contact measurement, Hall element and Luo-coil are not existed with the test loop directly be electrically connected;
Said Hall element and Luo-coil be on-line monitoring dc circuit breaker loop current constantly; The voltage signal of sensor output is sent into level judging circuit; If, then choose the measurement result of Hall element, otherwise then choose the measurement result of Luo-coil less than setting level value;
The voltage signal of said output passes through amplification, filtering and isolation successively after decision circuitry, be admitted to CPU and carry out analyzing and processing; If measure voltage greater than the dropout of the isolating switch action voltage of adjusting, then CPU sends the instruction of threading off to tripping system, electrical apparatus release is threaded off rapidly, the isolating switch quick acting switching-off.
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| CN2012100412233A CN102590587A (en) | 2012-02-22 | 2012-02-22 | Device and method for identifying short-circuit current of medium-voltage high-current direct current circuit breaker |
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| CN2012100412233A CN102590587A (en) | 2012-02-22 | 2012-02-22 | Device and method for identifying short-circuit current of medium-voltage high-current direct current circuit breaker |
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Cited By (9)
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| CN105021876A (en) * | 2014-04-28 | 2015-11-04 | 国家电网公司 | Electric current monitoring instrument and electric current monitoring system |
| CN106684831A (en) * | 2017-01-13 | 2017-05-17 | 中航宝胜电气股份有限公司 | Medium-voltage and short-circuit current rapid identification and on-off control device and control method thereof |
| CN107478889A (en) * | 2016-11-01 | 2017-12-15 | 西安交通大学 | A kind of quick identification device of electromagnetic type short circuit current and method |
| CN107576880A (en) * | 2017-09-21 | 2018-01-12 | 哈尔滨理工大学 | A kind of Power System Shortcuts current detecting identifier |
| CN108303617A (en) * | 2018-02-02 | 2018-07-20 | 西安沣源智能装备科技有限公司 | A kind of fault location system |
| CN109245034A (en) * | 2018-09-12 | 2019-01-18 | 山东电力设备有限公司 | Mechanical high-voltage dc circuit breaker Control and protection system and its control method |
| CN109917180A (en) * | 2019-04-03 | 2019-06-21 | 杭州安脉盛智能技术有限公司 | Direct current signal non-contact detecting sensor based on current transformer |
| CN111755287A (en) * | 2020-07-09 | 2020-10-09 | 江苏三口井信息科技有限公司 | Circuit breaker device with fault recording performance |
| CN112415370A (en) * | 2019-08-20 | 2021-02-26 | 西安高压电器研究院有限责任公司 | High voltage direct current breaker cut-off small current measuring device under high voltage environment |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105021876A (en) * | 2014-04-28 | 2015-11-04 | 国家电网公司 | Electric current monitoring instrument and electric current monitoring system |
| CN107478889A (en) * | 2016-11-01 | 2017-12-15 | 西安交通大学 | A kind of quick identification device of electromagnetic type short circuit current and method |
| CN106684831A (en) * | 2017-01-13 | 2017-05-17 | 中航宝胜电气股份有限公司 | Medium-voltage and short-circuit current rapid identification and on-off control device and control method thereof |
| CN107576880A (en) * | 2017-09-21 | 2018-01-12 | 哈尔滨理工大学 | A kind of Power System Shortcuts current detecting identifier |
| CN108303617A (en) * | 2018-02-02 | 2018-07-20 | 西安沣源智能装备科技有限公司 | A kind of fault location system |
| CN109245034A (en) * | 2018-09-12 | 2019-01-18 | 山东电力设备有限公司 | Mechanical high-voltage dc circuit breaker Control and protection system and its control method |
| WO2020052663A1 (en) * | 2018-09-12 | 2020-03-19 | 山东电力设备有限公司 | Control and protection system for mechanical high-voltage direct current circuit breaker, and control method for same |
| CN109917180A (en) * | 2019-04-03 | 2019-06-21 | 杭州安脉盛智能技术有限公司 | Direct current signal non-contact detecting sensor based on current transformer |
| CN109917180B (en) * | 2019-04-03 | 2021-01-15 | 杭州安脉盛智能技术有限公司 | Direct current signal non-contact detection sensor based on current transformer |
| CN112415370A (en) * | 2019-08-20 | 2021-02-26 | 西安高压电器研究院有限责任公司 | High voltage direct current breaker cut-off small current measuring device under high voltage environment |
| CN111755287A (en) * | 2020-07-09 | 2020-10-09 | 江苏三口井信息科技有限公司 | Circuit breaker device with fault recording performance |
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Application publication date: 20120718 |