CN201449415U - Alternating-current/direct-current leakage current sensor - Google Patents
Alternating-current/direct-current leakage current sensor Download PDFInfo
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- CN201449415U CN201449415U CN 200920060294 CN200920060294U CN201449415U CN 201449415 U CN201449415 U CN 201449415U CN 200920060294 CN200920060294 CN 200920060294 CN 200920060294 U CN200920060294 U CN 200920060294U CN 201449415 U CN201449415 U CN 201449415U
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Abstract
The utility model relates to an alternating-current/direct-current leakage current sensor, which comprises an iron core which is provided with through hole and is sealed, and a direct current leakage current detecting circuit loaded on the iron core, wherein a detected circuit on which alternating current or direct current loaded on passes through the through hole, the direct current leakage current detecting circuit comprises an oscillated magnetic modulator return circuit and a rapid filter return circuit which are orderly connected, the oscillated magnetic modulator return circuit comprises a first operation amplifier and an excitation coil winding on the iron core, which are connected, and further comprises an alternating current leakage current detecting circuit loaded on the iron core, and the alternating current leakage current detecting circuit comprises an alternating inductance coil wound on the iron core and an alternating current signal processing circuit connected with the alternating inductance coil. The alternating-current/direct-current leakage current sensor of the utility model can simultaneously sample alternating/direct currant leakage current (small current) signals of the same detected circuit, independently separates, processes and outputs the signals from two independent ends, has simple structure, multiple functions on one device, less cost, obvious economical benefits, and is convenient for popularizing and use.
Description
Technical field
The utility model relates to a kind of current sensor, the current sensor of particularly a kind of friendship that is used to detect DC power system or consumer, straight electric leakage signal.
Background technology
In departments such as the electric power that uses DC control system, chemical industry, telecommunications, railways, safe operation to DC power system requires very strict, implement monitoring DC power system Ground leakage current situation, especially the detection of the Weak current in the Ground leakage current, widespread use DC leakage current sensor (claiming small electric current sensor again).As a kind of perforation formula DC low current sensor that has been 012312401 patent disclosure at Chinese application number, it comprises the DC leakage current testing circuit that is loaded with on the iron core of band through hole and a sealing and the described iron core, this testing circuit comprises around the oscillating magnetic flux modulator of the tickler of described iron core and order electrical connection, active filter, integration indifference resonance-amplifier, the output terminal of integration indifference resonance-amplifier is connected with an end of described tickler, the other end of described tickler is by a resistance eutral grounding, and described oscillating magnetic flux modulator is is directly connected and composed by magnetizing coil and the operational amplifier on described iron core; This sensor utilizes magnetic modulation and magnetic balance principle of combining, realizes the online detection of DC power system network leakage current, and it has sensitivity and stability is high, the characteristic that antijamming capability is strong.
In recent years, DC power system manufacturing enterprise is according to the power-supply system actual operating state, think to have of the interference of on-the-spot Alternating Current Power Supply network in the feeding circuit of direct supply, press for the ac leakage stream that monitoring may exist in the DC feedback loop the DC feedback loop.Above-mentioned DC leakage current sensor does not possess and detects the alternating current function, D.C mutual-inductor need be installed separately and detect network and realizes the detection of alternating current.Therefore, must make that this measuring system complex structure, circuit are loaded down with trivial details, be difficult to promote the use of.
The utility model content
Problem to be solved in the utility model provides a kind of alternating current-direct current leakage current sensor, can detect AC and DC leakage current signal simultaneously.
In order to solve the problems of the technologies described above, basic design of the present utility model is: on the sensor that comprises the DC leakage current testing circuit that an iron core and described iron core are loaded with the ac leakage current detection circuit is set, it draws the AC signal that is loaded with the ac leakage stream information by dual mode respectively, extract the ac leakage stream information through identical AC signal treatment circuit then, thereby realize detecting simultaneously AC and DC leakage current signal.
As first kind of technical scheme of the present utility model be: a kind of alternating current-direct current leakage current sensor, comprise the DC leakage current testing circuit that is loaded with on the iron core of band through hole and a sealing and the described iron core, the detected circuit that is loaded with interchange or DC current passes from described through hole, described DC leakage current testing circuit comprises oscillating magnetic flux modulator loop and the fast electric-wave filter loop that connects successively, described oscillating magnetic flux modulator loop connects and composes by first operational amplifier with around the magnetizing coil of described iron core, also comprise the ac leakage current detection circuit that is loaded with on the described iron core, described ac leakage current detection circuit comprises around the alternating current impression coil of described iron core and the AC signal treatment circuit that is connected with described alternating current impression coil.
As second kind of technical scheme of the present utility model be: a kind of alternating current-direct current leakage current sensor, comprise the DC leakage current testing circuit that is loaded with on the iron core of band through hole and a sealing and the described iron core, the detected circuit that is loaded with interchange or DC current passes from described through hole, described DC leakage current testing circuit comprises oscillating magnetic flux modulator loop and the fast electric-wave filter loop that connects successively, described oscillating magnetic flux modulator loop comprises around the magnetizing coil and first operational amplifier of described iron core and connecting and composing, also comprise the ac leakage current detection circuit that is loaded with on the described iron core, described ac leakage current detection circuit comprises resistance and AC signal treatment circuit, one end of described resistance connects an end and the described AC signal treatment circuit of described magnetizing coil, the other end ground connection of described resistance.
As the concrete scheme of above two kinds of technical schemes, described AC signal treatment circuit comprises the second operational amplifier loop, is used for the processing and amplifying input signal and exports the correspondent voltage signal; Bandpass filter loop with the output terminal in the described second operational amplifier loop is connected is used to consider the ac voltage signal that the characteristic frequency section.
Further scheme is, described AC signal treatment circuit also comprises the commutating circuit that is connected with the output terminal in described bandpass filter loop, is used to handle the ac voltage signal of described characteristic frequency section and with the mode output AC leakage current testing result of d. c. voltage signal.
Described commutating circuit is full-wave rectification loop or half-wave rectification loop.
Also comprise the described rearmounted output circuit that is connected with the output terminal of commutating circuit, described rearmounted output circuit is voltage-current converter circuit, voltage frequency conversioning circuit or analog-to-digital conversion circuit.
Further scheme is that described DC leakage current testing circuit also comprises the proportional amplifier loop that is connected with the output terminal in described fast electric-wave filter loop again.The output terminal in described proportional amplifier loop is connected with rearmounted output circuit, and described rearmounted output circuit is voltage and current signal change-over circuit, voltage frequency conversioning circuit or analog-to-digital conversion circuit.
Further more in addition scheme is, described DC leakage current testing circuit also comprises a tickler and an integration indifference resonance-amplifier loop around described iron core, the input end in described integration indifference resonance-amplifier loop is connected with the output terminal in described fast electric-wave filter loop, one end ground connection of described tickler, the other end of described tickler is connected by the output terminal of sampling resistor with described integration indifference resonance-amplifier loop.The output terminal of described DC leakage current testing circuit is connected with rearmounted output circuit, and described rearmounted output circuit is voltage and current signal change-over circuit, voltage frequency conversioning circuit or analog-to-digital conversion circuit.
The utility model alternating current-direct current leakage current sensor is loaded with DC leakage current testing circuit and ac leakage current detection circuit simultaneously by same iron core, the ac leakage current detection circuit is directly drawn the AC signal that is loaded with the ac leakage stream information by magnetizing coil or by an alternating current impression coil earlier, extract the ac leakage stream information by the AC signal treatment circuit again, thereby realize detected circuit is detected AC and DC leakage current signal simultaneously, simple in structure, multi-use, cost reduces, remarkable in economical benefits is convenient to promote the use of.The utility model alternating current-direct current leakage current sensor can be realized the difference of AC and DC leakage current (little electric current) signal to same detected circuit or sampling simultaneously, independent separate and processing, the output of independent two ends on same iron core.The utility model alternating current-direct current leakage current sensor does not connect rearmounted output circuit at the output terminal of DC leakage current testing circuit and ac leakage current detection circuit, realizes the multiple way of outputs such as voltage output, electric current output, frequency output, RS484 or RS232 digitizing output of testing result.
Description of drawings
Fig. 1 is the synoptic diagram of the utility model embodiment one;
Fig. 2 is the synoptic diagram of the utility model embodiment two;
Fig. 3 is the synoptic diagram of the utility model embodiment three.
Embodiment
Embodiment one
As shown in Figure 1, the utility model alternating current-direct current leakage current sensor comprises the iron core 1 of a band through hole and sealing, be loaded with DC leakage current testing circuit and ac leakage current detection circuit on the described iron core 1 simultaneously, the detected circuit 5 that is loaded with interchange or DC current passes from described through hole; The DC leakage current testing circuit comprises oscillating magnetic flux modulator loop 6, fast electric-wave filter loop, proportional amplifier loop, oscillating magnetic flux modulator loop 6 is connected and composed by the magnetizing coil 2 on iron core 1 and first operational amplifier, the input end in fast electric-wave filter loop connects the output terminal in oscillating magnetic flux modulator loop, the input end in proportional amplifier loop connects the output terminal in fast electric-wave filter loop, the testing result of the output terminal output DC leakage current in proportional amplifier loop; The ac leakage current detection circuit comprises alternating current impression coil 3 on the iron core 1 and the AC signal treatment circuit 8 that is connected with described alternating current impression coil 3, AC signal treatment circuit 8 comprise the second operational amplifier loop, with the output terminal connecting band bandpass filter loop in the second operational amplifier loop, the commutating circuit that is connected with the output terminal in bandpass filter loop, the output terminal output AC leakage current testing result of commutating circuit, the input end in the second operational amplifier loop connects alternating current impression coil 3; Commutating circuit can be the full-wave rectification loop that is made of two integrated operational amplifiers, also can be the half-wave rectification loop that is made of an integrated operational amplifier.
The principle of work of DC leakage current testing circuit: oscillating magnetic flux modulator loop 6 produces square-wave signal as the excited signal source in magnetizing coil 2, when there is DC leakage current in detected circuit, DC leakage current can produce the direct current offset magnetic potential in iron core 1, square-wave signal in the magnetizing coil 2 is subjected to the influence of direct current offset magnetic potential and asymmetric skew (modulated process) takes place, filter AC signal and keep the output d. c. voltage signal (demodulating process) relevant by the fast electric-wave filter loop then with direct current offset magnetic potential size and Orientation, in order to cooperate rearmounted output or the needed voltage swing of display circuit, pass through proportional amplifier loop processing and amplifying again, the acquisition form is the testing result of d. c. voltage signal, this d. c. voltage signal size is proportional to DC leakage current size and direction with direction, thereby realizes the open loop of DC leakage current is detected.
The principle of work of ac leakage current detection circuit: at first the centre frequency of bandpass filter departs from the frequency of the square-wave signal in oscillating magnetic flux modulator loop 6; When there is ac leakage stream in detected circuit, the ac current signal that can have two kinds of frequencies in the alternating current impression coil 3, all be that magnetic circuit in the iron core changes and to cause alternating current impression coil 3 that electric current is arranged, first kind of ac current signal is to be changed and produced by the magnetic circuit that square-wave signal causes in iron core 1, and second kind of ac current signal is to be changed and produced by the magnetic circuit that ac leakage stream causes in iron core 1; Amplify the corresponding ac voltage signal of conversion output (because ac current signal is very weak through the second operational amplifier loop then, be to drive bandpass filter loop operate as normal in the input tape bandpass filter loop directly, therefore ac current signal need amplify conversion process through the second operational amplifier loop), filter first kind of ac current signal and export the characteristic frequency section through the bandpass filter loop again, the ac voltage signal that belongs to second kind of ac current signal, the ac voltage signal of this moment is directly proportional with the amplitude size of ac leakage stream, the frequency unanimity; Needs for the ease of visual representation and back-end circuit, handle the ac leakage stream testing result that the form that draws is a d. c. voltage signal by commutating circuit again, this d. c. voltage signal is directly proportional with the amplitude size of ac leakage stream, thereby realization is (certain to the detection of the ac leakage stream of characteristic frequency section, can connect frequency spectrograph at the output terminal in bandpass filter loop, directly show the size and the frequency of ac voltage signal).
In order to adapt to the requirement of different user, the output terminal of DC leakage current testing circuit and ac leakage current detection circuit can connect rearmounted output circuit respectively, this postposition output circuit can be voltage-current converter circuit, voltage frequency conversioning circuit or analog-to-digital conversion circuit, thereby realizes the multiple way of outputs such as voltage output, electric current output, frequency output, RS484 or RS232 digitizing output of testing result.
By above-mentioned principle, the utility model alternating current-direct current leakage current sensor can be realized the sampling respectively of AC and DC leakage current (little electric current) signal to same detected circuit 5 on same iron core, independent separate and processing, the output of independent two ends.
DC leakage current testing circuit and ac leakage current detection circuit are co-located on the same wiring board, with iron-core coil, circuit board and the encapsulation of flame retardant plastics shell, insulating property height, moistureproof ability are strong, both artistic and practical by electron pouring sealant for this wiring board and iron core.
Embodiment two
What as shown in Figure 2, present embodiment and example one were different is the DC leakage current testing circuit; In the present embodiment, backfeed loop has replaced the proportional amplifier loop, and this backfeed loop comprises tickler 4, integration indifference resonance-amplifier loop and the sampling resistor R on the iron core 1; The output terminal of the input termination fast electric-wave filter in integration indifference resonance-amplifier loop, one end ground connection of tickler 4, the other end of tickler 4 is connected with the output terminal in integration indifference resonance-amplifier loop by sampling resistor R, the magnetic flux opposite sign but equal magnitude that magnetic flux that the feedback current of integration indifference resonance-amplifier loop output produces in iron core 1 and detected DC leakage current produce, thereby the magnetic balance of realization iron circuit.Under the magnetic balance state, the voltage that feedback current produces at sampling resistor R two ends is exported as the DC leakage current testing result, realizes that the closed loop of DC leakage current detects output.
Embodiment three
As shown in Figure 3, what present embodiment and example one were different is, the ac leakage current detection circuit is not to draw the ac current signal that is loaded with the ac leakage stream information from the alternating current impression coil to realize detecting (promptly not needing the alternating current impression coil), detects ac leakage stream (little electric current) but directly draw the ac current signal that is loaded with the ac leakage stream information from magnetizing coil 2; One end of magnetizing coil 2 connects resistance 7 and AC signal treatment circuit 8 simultaneously, the other end ground connection of resistance 7, and AC signal treatment circuit 8, magnetizing coil 2 and resistance 7 constitute the ac leakage current detection circuit of present embodiment.
When there is ac leakage stream in detected circuit 5, the ac current signal that can have two kinds of frequencies in the magnetizing coil 2, first kind of ac current signal is directly to be produced at magnetizing coil 2 by square-wave signal, and second kind of ac current signal is to be changed and produced at magnetizing coil 2 by the magnetic circuit that ac leakage stream causes in iron core 1; Two kinds of electric current input exchange signal treatment circuits 8 in the magnetizing coil 2 are realized the detection to the ac leakage stream of characteristic frequency section.
The utility model is not limited to the foregoing description, based on simple replacement the foregoing description, that do not make creative work, should belong to the scope that the utility model discloses.
Claims (10)
1. alternating current-direct current leakage current sensor, comprise the DC leakage current testing circuit that is loaded with on the iron core of band through hole and a sealing and the described iron core, the detected circuit that is loaded with interchange or DC current passes from described through hole, described DC leakage current testing circuit comprises oscillating magnetic flux modulator loop and the fast electric-wave filter loop that connects successively, described oscillating magnetic flux modulator loop connects and composes by first operational amplifier with around the magnetizing coil of described iron core, it is characterized in that, also comprise the ac leakage current detection circuit that is loaded with on the described iron core, described ac leakage current detection circuit comprises around the alternating current impression coil of described iron core and the AC signal treatment circuit that is connected with described alternating current impression coil.
2. alternating current-direct current leakage current sensor, comprise the DC leakage current testing circuit that is loaded with on the iron core of band through hole and a sealing and the described iron core, the detected circuit that is loaded with interchange or DC current passes from described through hole, described DC leakage current testing circuit comprises oscillating magnetic flux modulator loop and the fast electric-wave filter loop that connects successively, described oscillating magnetic flux modulator loop comprises around the magnetizing coil and first operational amplifier of described iron core and connecting and composing, it is characterized in that, also comprise the ac leakage current detection circuit that is loaded with on the described iron core, described ac leakage current detection circuit comprises resistance and AC signal treatment circuit, one end of described resistance connects an end and the described AC signal treatment circuit of described magnetizing coil, the other end ground connection of described resistance.
3. alternating current-direct current leakage current sensor according to claim 1 and 2 is characterized in that, described AC signal treatment circuit comprises
The second operational amplifier loop is used for the processing and amplifying input signal and exports the correspondent voltage signal;
Bandpass filter loop with the output terminal in the described second operational amplifier loop is connected is used to consider the ac voltage signal that the characteristic frequency section.
4. alternating current-direct current leakage current sensor according to claim 3, it is characterized in that, described AC signal treatment circuit also comprises the commutating circuit that is connected with the output terminal in described bandpass filter loop, is used to handle the ac voltage signal of described characteristic frequency section and with the mode output AC leakage current testing result of d. c. voltage signal.
5. alternating current-direct current leakage current sensor according to claim 4 is characterized in that, described commutating circuit is full-wave rectification loop or half-wave rectification loop.
6. alternating current-direct current leakage current sensor according to claim 4, it is characterized in that, also comprise the described rearmounted output circuit that is connected with the output terminal of commutating circuit, described rearmounted output circuit is voltage-current converter circuit, voltage frequency conversioning circuit or analog-to-digital conversion circuit.
7. alternating current-direct current leakage current sensor according to claim 4 is characterized in that, described DC leakage current testing circuit also comprises the proportional amplifier loop that is connected with the output terminal in described fast electric-wave filter loop.
8. alternating current-direct current leakage current sensor according to claim 7, it is characterized in that, the output terminal in described proportional amplifier loop is connected with rearmounted output circuit, and described rearmounted output circuit is voltage and current signal change-over circuit, voltage frequency conversioning circuit or analog-to-digital conversion circuit.
9. alternating current-direct current leakage current sensor according to claim 4, it is characterized in that, described DC leakage current testing circuit also comprises a tickler and an integration indifference resonance-amplifier loop around described iron core, the input end in described integration indifference resonance-amplifier loop is connected with the output terminal in described fast electric-wave filter loop, one end ground connection of described tickler, the other end of described tickler is connected by the output terminal of sampling resistor with described integration indifference resonance-amplifier loop.
10. alternating current-direct current leakage current sensor according to claim 9, it is characterized in that, the output terminal of described DC leakage current testing circuit is connected with rearmounted output circuit, and described rearmounted output circuit is voltage and current signal change-over circuit, voltage frequency conversioning circuit or analog-to-digital conversion circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920060294 CN201449415U (en) | 2009-07-13 | 2009-07-13 | Alternating-current/direct-current leakage current sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920060294 CN201449415U (en) | 2009-07-13 | 2009-07-13 | Alternating-current/direct-current leakage current sensor |
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| CN201449415U true CN201449415U (en) | 2010-05-05 |
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| CN 200920060294 Expired - Lifetime CN201449415U (en) | 2009-07-13 | 2009-07-13 | Alternating-current/direct-current leakage current sensor |
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| CN102788930A (en) * | 2012-09-11 | 2012-11-21 | 深圳市金宏威技术股份有限公司 | Digital insulation monitoring sensor and method for testing leakage current |
| CN102981035A (en) * | 2012-12-07 | 2013-03-20 | 宁夏电力公司电力科学研究院 | Current clamp and power quality monitoring device |
| CN103229060A (en) * | 2011-09-09 | 2013-07-31 | 伊莎贝尔努特·霍伊斯勒两合公司 | Differential current sensor |
| CN103424643A (en) * | 2012-05-22 | 2013-12-04 | 上海巨磁实业有限公司 | Ground fault detecting device |
| CN103439670A (en) * | 2013-07-22 | 2013-12-11 | 凯立自动化有限公司 | Alternating current power supply sensing device |
| CN103576052A (en) * | 2012-08-02 | 2014-02-12 | 北京人民电器厂有限公司 | System and method for determining direct-current system fault branch circuits needing to be in in-series connection with alternating currents |
| CN103675399A (en) * | 2012-09-17 | 2014-03-26 | 上海汽车集团股份有限公司 | Hall current measurement device with strong anti-jamming capability |
| CN104221237A (en) * | 2012-02-29 | 2014-12-17 | 法雷奥电机控制系统公司 | Detection of a leakage current comprising a continuous component in a vehicle |
| CN104515931A (en) * | 2014-12-26 | 2015-04-15 | 华中科技大学 | Direct-current leakage current sensor based on magnetic modulation |
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| CN106602507A (en) * | 2015-10-15 | 2017-04-26 | 比亚迪股份有限公司 | Charger and leakage current protector for charger |
| CN106707013A (en) * | 2017-02-08 | 2017-05-24 | 深圳市硕亚科技有限公司 | Distributed low current detection system |
| CN109212304A (en) * | 2018-11-01 | 2019-01-15 | 东北电力大学 | The detection method of digital Weak current alternating current-direct current sensor based on direct current carrier communication technology |
| CN110190581A (en) * | 2019-06-04 | 2019-08-30 | 上海良信电器股份有限公司 | The Aftercurrent protecting equipment and method of breaker |
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| CN110873828A (en) * | 2018-08-31 | 2020-03-10 | 株洲中车时代电气股份有限公司 | DC circuit monitoring system for railway passenger vehicle |
| CN111856119A (en) * | 2020-08-24 | 2020-10-30 | 上海煜闻电子科技有限公司 | Leakage current detection device and detection method |
| CN112230043A (en) * | 2020-10-10 | 2021-01-15 | 浙江巨磁智能技术有限公司 | Method for separating alternating current from direct current by utilizing magnetic balance principle |
| WO2021068833A1 (en) * | 2019-10-09 | 2021-04-15 | 青岛鼎信通讯股份有限公司 | Circuit for alternating current and direct current leakage detection |
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2009
- 2009-07-13 CN CN 200920060294 patent/CN201449415U/en not_active Expired - Lifetime
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| CN104221237B (en) * | 2012-02-29 | 2018-04-03 | 法雷奥电机控制系统公司 | The detection of the leakage current including DC component in vehicle |
| CN103424643A (en) * | 2012-05-22 | 2013-12-04 | 上海巨磁实业有限公司 | Ground fault detecting device |
| CN103424643B (en) * | 2012-05-22 | 2017-09-12 | 浙江巨磁智能技术有限公司 | ground fault detection device |
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| CN105717403A (en) * | 2014-12-04 | 2016-06-29 | 国家电网公司 | Insulation fault monitoring system for cell array |
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| CN104515931A (en) * | 2014-12-26 | 2015-04-15 | 华中科技大学 | Direct-current leakage current sensor based on magnetic modulation |
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| CN106707013A (en) * | 2017-02-08 | 2017-05-24 | 深圳市硕亚科技有限公司 | Distributed low current detection system |
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Granted publication date: 20100505 |