CN103308743A - Direct current metering device - Google Patents
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- CN103308743A CN103308743A CN2013101993286A CN201310199328A CN103308743A CN 103308743 A CN103308743 A CN 103308743A CN 2013101993286 A CN2013101993286 A CN 2013101993286A CN 201310199328 A CN201310199328 A CN 201310199328A CN 103308743 A CN103308743 A CN 103308743A
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Abstract
A direct current metering device belongs to current metering equipment in the electrotechnology, solves the problems of insufficient precision and stability of the existing current sensing device used for industrial gauging, and is used for the standard gauging in the strong direct current industrial field with the reliable and stably operated structure. The direct current metering device comprises a sensing head, an exciting transformer, a modulation transformer, a low pass filter, a phase sensitive demodulator, a synthesis modulator and a power amplifier; the sensing head is annular and comprises a first annular detection iron core, a second annular detection iron core and an annular magnetic shield iron core; the first and second annular detection iron cores, respectively wound by two sets of detection windings, are overlapped to be wholly placed in the annular hollow cavity of the annular magnetic shield iron core; and a feedback winding surrounds the annular magnetic shield iron core. The direct current metering device can realize the accurate gauging of the industrial strong direct current with ten thousands of amperes, realizes full automation traction in the whole process without unbalance, and is high in stability and reliability and suitable for industrial application, and the proportion precision achieves more than 0.02%.
Description
Technical field
The invention belongs to the electric current metering outfit in the electrotechnics, particularly a kind of measuring apparatus for DC current.
Background technology
IEEE magnetics transactions the 4th phase of the 1st volume Dec nineteen sixty-five disclosed " 2 Wan An training self-balanced DC comparator " (" A Self-Balancing Direct Current Comparator for20; 000Amperes ", IEEE Transactions on Magnetics.Vol.MAG-1, NO.4, December, 1965.), be first DC high-current metering device based on the magnetic modulation principle in the world, its precision reaches 100,000/.Its two iron core magnetic modulators are as the ampere-turn equilibrium detector output signal, through detuner, amplifier, produce the feedback current feedback winding of flowing through, realize the balance of feedback ampere-turn and measured DC ampere-turn, determine that secondary feeds back the current ratio between little electric current and the large electric current of primary measured.There is following principle defective in this device: namely the direct current I/O characteristic of magnetic modulator is non-simple substance, namely along with the input direct-current electric current begins to increase from zero ampere-turn, detecting output dc voltage begins to rise, then descend until zero passage becomes negative value, the zero passage that then rises again become on the occasion of, form several false balance zero crossings.This non-simple substance characteristic causes system's closed loop rear stability poor, and system is easily unbalance, and commercial Application is restricted.
The applicant is in Chinese invention patent ZL02139203.X, a kind of D. C. current sensing device is disclosed, it comprises sensing head, power transformer, driver transformer, resistance, inductance, diode and operation amplifier and driver, transducing head structure is: the first annular detects iron core and the second annular detects iron core, be wound with respectively identical the first detection winding and second of the number of turn and detect winding, after assembly unit, the outside is wound with the compensation winding, integral body places the shielding iron core cavity, and the shielding iron core outside is wound with Secondary Winding.This patent of invention is based on detection and the ampere-turn equilibrium principle of magnetrol, as D. C. current sensing device, can satisfy 2/1000ths accuracy requirement, but not reach 2/10000ths above accuracy requirements, and as STANDARD MEASURING APPARATUS FOR, its application is restricted.
Summary of the invention
The invention provides a kind of DC current metering device, solve existing current sensor device and be used for industry measurement precision, stable inadequate problem, be used for the standard metering of strong dc industrial circle with structure reliable, stable operation.
A kind of DC current metering device provided by the present invention comprises sensing head, driver transformer, modulation transformer, low-pass filter, phase-sensitive demodulator, synthetic regulator and power amplifier, it is characterized in that:
Described sensing head is annular, comprise that the first annular detects iron core, the second annular detects iron core and annular magnetic shielding iron core, it is identical with the second annular detection core configuration that the first annular detects iron core, the first annular detects the iron core outside and is wound with the first modulation detection winding, and the first modulation detection winding outside is wound with the first excitation again and detects winding; The second annular detects the iron core outside and is wound with the second modulation detection winding, and the second modulation detection winding outside is wound with the second excitation again and detects winding; Described annular magnetic shielding iron core has toroidal cavity, respectively be wound with the first annular that two covers detect windings and detect iron core and the second annular and detect the toroidal cavity that integral body after the iron core stack places the annular magnetic shielding iron core, annular magnetic shielding iron core outside is wound with the feedback winding again;
Described the first modulation detection winding, the first excitation detect winding, the second modulation detection winding is identical with the number of turn that the second excitation detects winding, are 500 circles～5000 circles; Described feedback winding is 500 circles～20000 circles;
The Same Name of Ends of the Secondary Winding of described driver transformer, link to each other with the different name end that Same Name of Ends and second excitation of the first excitation detection winding detect winding simultaneously, the different name end of the Secondary Winding of driver transformer, with the first resistance be connected an end of resistance and be connected, the other end of the first resistance links to each other with the negative electrode of the first diode and also is connected simultaneously the input end of low-pass filter, the anode of the first diode is connected with the different name end that the first excitation detects winding, the other end of the second resistance is connected with negative electrode and the earth point of the second diode, and the anode of the second diode links to each other with the Same Name of Ends that the second excitation detects winding;
The Same Name of Ends of described the first modulation detection winding links to each other with the anode of the 3rd diode, the negative electrode of the 3rd diode connects the Secondary Winding Same Name of Ends of modulation transformer, the different name end of the first modulation detection winding, be connected with different name end and the earth point of the second modulation detection winding, the Same Name of Ends of the second modulation detection winding links to each other with the negative electrode of the 4th diode, the Secondary Winding different name end of the anodic bonding modulation transformer of the 4th diode, the Secondary Winding center tap of modulation transformer connects the input end of phase-sensitive demodulator, the output terminal of phase-sensitive demodulator is connected output terminal and is connected respectively the input end of synthetic regulator with low-pass filter, the output terminal of synthetic regulator connects the power amplifier input end, the power amplifier output terminal links to each other with the Same Name of Ends of feedback winding, and the different name end of feedback winding connects earth point by measuring resistance.
When the present invention worked, the bus of a tested DC current passed from described sensing head center hole.
Described DC current metering device is characterized in that:
In the described sensing head, described the first annular detects iron core, the second annular detects iron core and annular magnetic shielding iron core, and each cold-reduced silicon sheet that freely is wound into ring-type after annealing in process forms; Described annular magnetic shielding iron core has the circular of toroidal cavity through assembly unit in consisting of.
Described DC current metering device is characterized in that:
In the described sensing head, described the first annular detects iron core and the second annular detects iron core, detect iron core and second annulus detection iron core composition by first annulus separately, first annulus detection iron core and second annulus detect iron core and are comprised of the cold-reduced silicon sheet that is wound into semi-annular shape after annealing in process respectively separately;
Described the first modulation detection winding and the first excitation detect winding and all are divided into separately two sections, and correspondence detects on iron core and second annulus detection iron core around described first annular first annulus that detects iron core respectively, connects by wire between two sections windings; Described the second modulation detection winding and the second excitation detect winding and all are divided into separately two sections, and correspondence detects on iron core and second annulus detection iron core around described second annular first annulus that detects iron core respectively, connects by wire between two sections windings;
Described annular magnetic shielding iron core, formed by first annulus magnetic shielding iron core and second annulus magnetic shielding iron core, first annulus magnetic shielding iron core and second annulus magnetic shielding iron core are comprised of the cold-reduced silicon sheet that is wound into semi-annular shape after annealing in process respectively separately, and the semi-annular shape of semicircle toroidal cavity is arranged in consisting of through assembly unit;
Described feedback winding is divided into two sections, and is corresponding on first annulus magnetic shielding iron core and second annulus magnetic shielding iron core of described annular magnetic shielding iron core respectively, connects by wire between two sections windings.
The present invention detects on iron core and the second annular detection iron core in the first annular, be wound with respectively the first identical modulation detection winding of the two cover numbers of turn, the first excitation detects winding and the second modulation detection winding, the second excitation detects winding, two excitations detect winding, the first diode and the second diode, the first resistance and the second resistance and driver transformer, consist of the power frequency positive half-wave based on the D.C. current detecting system of magnetrol principle, direct current I/O characteristic based on the detection system of this magnetrol principle is simple substance, is adapted to especially the detection of large dc current signal; Two modulation detection windings, the 3rd diode and the 4th diode and modulation transformer, consist of the negative half-wave of power frequency based on the D.C. current detecting system of magnetic modulator principle, direct current I/O characteristic based on the detection system of this magnetic modulator principle, be adapted to especially little dc current signal such as near the detection zero ampere-turn, its detection sensitivity is high; Two annulars detect on the iron core and respectively are wound with double winding, because they are operated in respectively positive half-wave and the negative half-wave of power frequency, and because the specific polarity that described winding is set, not only can not produce the phase mutual interference, and the cancelling out each other of issuable iron core remanent magnetism when being conducive to respectively be operated in half cycles; Two kinds of magnetrol and magnetic modulators detect the output signals of principle, pass through respectively low-pass filter, phase-sensitive demodulator after, enter synthetic regulator, the direct current detection signal of positive-negative half-cycle ripple is superposeed, obtain the direct current detection signal of power frequency whole wave; The direct current I/O of this whole wave detects characteristic, both had magnetic modulator and detected near the highly sensitive characteristic of principle zero ampere-turn, the simple substance characteristic that also has the large direct current detection signal of magnetrol principle, the direct current of having broken through traditional magnetic modulation principle existence detects false balance zero crossing, the non-simple substance thorny problem of characteristic.The power frequency whole wave direct current detection signal of synthetic regulator output, behind power amplifier, give feedback winding input feedback electric current, realize the magnetic potential balance of feedback direct current ampere-turn and tested direct current ampere-turn, can realize the accurate-metering of tens thousand of amperes of industrial DC electric currents, proportional precision reaches more than 2/10000ths, and this system's full-automatic tracking and not unbalance, its stability, reliability are high, are applicable to commercial Application.
Description of drawings
Fig. 1 is sensing head external form schematic diagram of the present invention;
Fig. 2 is sensing head sectional drawing schematic diagram;
Fig. 3 is circuit diagram of the present invention.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
Embodiments of the invention comprise sensing head, driver transformer T
1, modulation transformer T
2, low-pass filter E, phase-sensitive demodulator F, synthetic regulator G and power amplifier H;
As shown in Figure 1 and Figure 2, described sensing head is annular, comprises that the first annular detects iron core C
1, the second annular detects iron core C
2With annular magnetic shielding iron core C, the first annular detects iron core C
1Detect iron core C with the second annular
2Shape is identical, and the first annular detects iron core C
1The outside is wound with the first modulation detection winding W
D1', the first modulation detection winding W
D1' outside is wound with the first excitation again and detects winding W
D1The second annular detects iron core C
2The outside is wound with the second modulation detection winding W
D2', the second modulation detection winding W
D2' outside is wound with the second excitation again and detects winding W
D2Described annular magnetic shielding iron core C has toroidal cavity, respectively is wound with the first annular detection iron core C that two covers detect winding
1Detect iron core C with the second annular
2Integral body places the toroidal cavity of annular magnetic shielding iron core C after the stack, and annular magnetic shielding iron core C outside is wound with feedback winding W again
2
Described the first modulation detection winding W
D1', the first excitation detects winding W
D1, the second modulation detection winding W
D2' and the second excitation detection winding W
D2The number of turn identical, be 2000 circles; Described feedback winding W
2Be 10000 circles;
As shown in Figure 3, described driver transformer T
1The Same Name of Ends of Secondary Winding, simultaneously and the first excitation detect winding W
D1Same Name of Ends and the second excitation detect winding W
D2The different name end link to each other driver transformer T
1The different name end of Secondary Winding, with the first resistance R
1With the second resistance R
2An end connect the first resistance R
1The other end and the first diode D
1Negative electrode link to each other and connect simultaneously the input end of low-pass filter E, the first diode D
1Anode and the first excitation detect winding W
D1The different name end connect the second resistance R
2The other end and the second diode D
2Negative electrode and earth point connect the second diode D
2Anode and the second excitation detect winding W
D2Same Name of Ends link to each other;
Described the first modulation detection winding W
D1' Same Name of Ends and the 3rd diode D
3Anode link to each other the 3rd diode D
3Negative electrode connect modulation transformer T
2The Secondary Winding Same Name of Ends, the first modulation detection winding W
D1' the different name end, with the second modulation detection winding W
D2' different name end and earth point connect the second modulation detection winding W
D2' Same Name of Ends and the 4th diode D
4Negative electrode link to each other the 4th diode D
4Anodic bonding modulation transformer T
2Secondary Winding different name end, modulation transformer T
2The Secondary Winding center tap connect the input end of phase-sensitive demodulator F, the output terminal of phase-sensitive demodulator F is connected output terminal and is connected respectively the input end of synthetic regulator G with low-pass filter E, the output terminal of synthetic regulator G connects power amplifier H input end, power amplifier H output terminal and feedback winding W
2Same Name of Ends link to each other feedback winding W
2The different name end by measuring resistance R
SConnect earth point, measuring resistance R
SResistance is 1 ohm.
When the present invention works, a tested DC current I
1Bus W
1Pass from described sensing head center hole.The power frequency full-wave direct current detection signal of synthetic regulator G output is given feedback winding W behind power amplifier H
2The input feedback electric current I
2, realize feedback direct current ampere-turn W
2I
2With tested direct current ampere-turn W
1I
1Magnetic potential balance W
1I
1=W
2I
2A common tested DC current I
1Bus W
1Be 1 circle, so feedback current I
2=I
1W
1/ W
2Represent exactly a tested DC current I
1, coefficient of ratio W
1/ W
2For turn ratio tested and the feedback winding, it is a constant.Feedback current I
2Flow through measuring resistance R
SObtain voltage I
2R
S, to satisfy the needs of voltage signal sampling instrument.
As shown in Figure 1 and Figure 2, in the sensing head of the present embodiment, described the first annular detects iron core C
1Detect iron core C with the second annular
2, detecting iron core and second annulus detection iron core composition by first annulus separately, first annulus detection iron core and second annulus detect iron core and are comprised of the cold-reduced silicon sheet that is wound into semi-annular shape after annealing in process respectively separately;
Described the first modulation detection winding W
D1' and the first excitation detection winding W
D1All be divided into separately two sections, corresponding to described the first annular detection iron core C respectively
1First annulus detect iron core and second annulus detects on iron core, connect by wire between two sections windings; Described the second modulation detection winding W
D2' and the second excitation detection winding W
D2All be divided into separately two sections, corresponding to described the second annular detection iron core C respectively
2First annulus detect iron core and second annulus detects on iron core, connect by wire between two sections windings;
Described annular magnetic shielding iron core C, formed by first annulus magnetic shielding iron core and second annulus magnetic shielding iron core, first annulus magnetic shielding iron core and second annulus magnetic shielding iron core are comprised of the cold-reduced silicon sheet that is wound into semi-annular shape after annealing in process respectively separately, and the semi-annular shape of semicircle toroidal cavity is arranged in consisting of through assembly unit;
Described feedback winding W
2Be divided into two sections, corresponding on first annulus magnetic shielding iron core and second annulus magnetic shielding iron core of described annular magnetic shielding iron core C respectively, connect by wire between two sections windings; First annulus magnetic shielding iron core and second annulus magnetic shielding iron core are spliced into circular integral body at A, B place.
Claims (3)
1. a DC current metering device comprises sensing head, driver transformer (T
1), modulation transformer (T
2), low-pass filter (E), phase-sensitive demodulator (F), synthetic regulator (G) and power amplifier (H), it is characterized in that:
Described sensing head is annular, comprises that the first annular detects iron core (C
1), the second annular detects iron core (C
2) and annular magnetic shielding iron core (C), the first annular detects iron core (C
1) and the second annular detection iron core (C
2) shape is identical, the first annular detects iron core (C
1) outside is wound with the first modulation detection winding (W
D1'), the first modulation detection winding (W
D1') outside is wound with the first excitation again and detects winding (W
D1); The second annular detects iron core (C
2) outside is wound with the second modulation detection winding (W
D2'), the second modulation detection winding (W
D2') outside is wound with the second excitation again and detects winding (W
D2); Described annular magnetic shielding iron core (C) has toroidal cavity, respectively is wound with the first annular detection iron core (C that two covers detect winding
1) and the second annular detection iron core (C
2) integral body places the toroidal cavity of annular magnetic shielding iron core (C) after the stack, annular magnetic shielding iron core (C) outside is wound with feedback winding (W again
2);
Described the first modulation detection winding (W
D1'), the first excitation detects winding (W
D1), the second modulation detection winding (W
D2') and the second excitation detection winding (W
D2) the number of turn identical, be 500 circles～5000 circles; Described feedback winding (W
2) be 500 circles～20000 circles;
Described driver transformer (T
1) the Same Name of Ends of Secondary Winding, simultaneously and the first excitation detect winding (W
D1) Same Name of Ends and the second excitation detect winding (W
D2) the different name end link to each other driver transformer (T
1) the different name end of Secondary Winding, with the first resistance (R
1) and the second resistance (R
2) an end connect the first resistance (R
1) the other end and the first diode (D
1) negative electrode link to each other and connect simultaneously the input end of low-pass filter (E), the first diode (D
1) anode and the first excitation detect winding (W
D1) the different name end connect the second resistance (R
2) the other end and the second diode (D
2) negative electrode and earth point connect the second diode (D
2) anode and the second excitation detect winding (W
D2) Same Name of Ends link to each other;
Described the first modulation detection winding (W
D1') Same Name of Ends and the 3rd diode (D
3) anode link to each other the 3rd diode (D
3) negative electrode connect modulation transformer (T
2) the Secondary Winding Same Name of Ends, the first modulation detection winding (W
D1') the different name end, with the second modulation detection winding (W
D2') different name end and earth point connect the second modulation detection winding (W
D2') Same Name of Ends and the 4th diode (D
4Negative electrode link to each other the 4th diode (D
4) anodic bonding modulation transformer (T
2) Secondary Winding different name end, modulation transformer (T
2) the Secondary Winding center tap connect the input end of phase-sensitive demodulator (F), the output terminal of phase-sensitive demodulator (F) is connected output terminal and is connected respectively the input end of synthetic regulator (G) with low-pass filter E, the output terminal of synthetic regulator (G) connects power amplifier (H) input end, power amplifier (H) output terminal and feedback winding (W
2) Same Name of Ends link to each other feedback winding (W
2) the different name end by measuring resistance (R
S) the connection earth point.
When the present invention works, the bus (W of a tested DC current
1) pass from described sensing head center hole.
2. DC current as claimed in claim 1 is measured device, it is characterized in that:
In the described sensing head, described the first annular detects iron core (C
1), the second annular detects iron core (C
2) and annular magnetic shielding iron core (C), each cold-reduced silicon sheet that freely is wound into ring-type after annealing in process forms; Described annular magnetic shielding iron core (C) has the circular of toroidal cavity through assembly unit in consisting of.
3. DC current as claimed in claim 1 or 2 is measured device, it is characterized in that:
In the described sensing head, described the first annular detects iron core (C
1) and the second annular detection iron core (C
2), detecting iron core and second annulus detection iron core composition by first annulus separately, first annulus detection iron core and second annulus detect iron core and are comprised of the cold-reduced silicon sheet that is wound into semi-annular shape after annealing in process respectively separately;
Described the first modulation detection winding (W
D1') and the first excitation detection winding (W
D1) all be divided into separately two sections, corresponding to described the first annular detection iron core (C respectively
1) first annulus detect iron core and second annulus detects on iron core, connect by wire between two sections windings; Described the second modulation detection winding (W
D2') and the second excitation detection winding (W
D2) all be divided into separately two sections, corresponding to described the second annular detection iron core (C respectively
2) first annulus detect iron core and second annulus detects on iron core, connect by wire between two sections windings;
Described annular magnetic shielding iron core (C), formed by first annulus magnetic shielding iron core and second annulus magnetic shielding iron core, first annulus magnetic shielding iron core and second annulus magnetic shielding iron core are comprised of the cold-reduced silicon sheet that is wound into semi-annular shape after annealing in process respectively separately, and the semi-annular shape of semicircle toroidal cavity is arranged in consisting of through assembly unit;
Described feedback winding (W
2) be divided into two sections, corresponding on first annulus magnetic shielding iron core and second annulus magnetic shielding iron core of described annular magnetic shielding iron core (C) respectively, connect by wire between two sections windings.
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|---|---|---|---|
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| CN103543323A (en) * | 2013-11-05 | 2014-01-29 | 云南省计量测试技术研究院 | Current detection device for large direct current charge-discharge facility |
| CN104198796A (en) * | 2014-08-22 | 2014-12-10 | 安阳师范学院 | Direct current detection circuit and method based on transformer |
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| CN106950408A (en) * | 2017-03-08 | 2017-07-14 | 国网浙江省电力公司电力科学研究院 | A kind of high-accuracy wide-range Vehicular direct-current electric energy meter |
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| CN104198796A (en) * | 2014-08-22 | 2014-12-10 | 安阳师范学院 | Direct current detection circuit and method based on transformer |
| CN104198796B (en) * | 2014-08-22 | 2019-03-12 | 安阳师范学院 | D.C. current detecting circuit and method based on transformer |
| CN105510673A (en) * | 2015-11-27 | 2016-04-20 | 华中科技大学 | Direct current measuring device |
| CN105510673B (en) * | 2015-11-27 | 2018-07-13 | 华中科技大学 | A kind of direct current measuring devices |
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