CN103308743B - Direct current metering device - Google Patents
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- CN103308743B CN103308743B CN201310199328.6A CN201310199328A CN103308743B CN 103308743 B CN103308743 B CN 103308743B CN 201310199328 A CN201310199328 A CN 201310199328A CN 103308743 B CN103308743 B CN 103308743B
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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 electrotechnics, particularly a kind of measuring apparatus for DC current.
Background technology
IEEE magnetics transactions volume the 4th phase in Dec nineteen sixty-five the 1st 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 the first DC high-current metering device based on magnetic modulation principle in the world, its precision reaches 100,000/.Its two iron core magnetic modulators are as ampere-turn equilibrium detector output signal, through detuner, amplifier, produce feedback current and flow through feedback winding, realize the balance of feedback ampere-turn and measured DC ampere-turn, determine the current ratio between secondary feedback small area analysis and primary measured big current.There is following principle defect in this device: namely the direct current I/O characteristic of magnetic modulator is non-simple substance, namely along with input direct-current electric current increases from zero ampere-turn, detect output DC voltage to start to rise, then decline until zero passage becomes negative value, then the zero passage that rises again become on the occasion of, form several false equilibrated zero points.This non-simple substance characteristic causes system closed loop rear stability poor, and system is easily unbalance, and commercial Application is restricted.
Applicant is in Chinese invention patent ZL02139203.X, disclose a kind of D. C. current sensing device, 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, the the first detection winding and second being wound with the number of turn respectively identical detects winding, after assembled, outside is wound with compensative winding, entirety is placed in shielding iron core cavity, is wound with Secondary Winding outside shielding iron core.This patent of invention is detection based on magnetrol and ampere-turn equilibrium principle, and as D. C. current sensing device, can meet the accuracy requirement of 2/1000ths, but not reach more than 2/10000ths accuracy requirements, 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 for industry measurement precision, problem that stability is inadequate, be used for the standard metering of strong dc industrial circle with structure that is 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, synthesis regulator and power amplifier, it is characterized in that:
Described sensing head is annular, comprise the first annular and detect iron core, the second annular detection iron core and annular magnetic shielding iron core, it is identical with the second annular detection core configuration that first annular detects iron core, first annular detects outside iron core and is wound with the first modulation detection winding, is wound with the first excitation again and detects winding outside the first modulation detection winding; Second annular detects outside iron core and is wound with the second modulation detection winding, is wound with the second excitation again and detects winding outside the second modulation detection winding; Described annular magnetic shielding iron core has toroidal cavity, the the first annular detection iron core and the second annular detection iron core that are respectively wound with two covers detection windings superpose the toroidal cavity that rear entirety is placed in annular magnetic shielding iron core, are wound with feedback winding again outside annular magnetic shielding iron core;
Described 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 circle ~ 5000 circles; Described feedback winding is 500 circle ~ 20000 circles;
The Same Name of Ends of the Secondary Winding of described driver transformer, encourage the Same Name of Ends and second detecting winding to encourage the different name end detecting winding to be connected with first simultaneously, the different name end of the Secondary Winding of driver transformer, be connected with one end of the first resistance and the second resistance, the other end of the first resistance is connected with the negative electrode of the first diode and is connected the input end of low-pass filter simultaneously, the anode and first of the first diode encourages the different name end detecting winding to be connected, the other end of the second resistance is connected with the negative electrode of the second diode and earth point, the anode and second of the second diode encourages the Same Name of Ends detecting winding to be connected,
The Same Name of Ends of described first modulation detection winding is connected 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 the different name end of the second modulation detection winding and earth point, the Same Name of Ends of the second modulation detection winding is connected with the negative electrode of the 4th diode, the anode of the 4th diode connects the Secondary Winding different name end of modulation transformer, the Secondary Winding center tap of modulation transformer connects the input end of phase-sensitive demodulator, the output terminal of phase-sensitive demodulator and the output terminal of low-pass filter are connected the input end of synthesis regulator respectively, the output terminal of synthesis regulator connects power amplifier input, power amplifier output is connected with the Same Name of Ends of feedback winding, the different name end of feedback winding connects earth point by measuring resistance.
When the present invention works, the bus of a tested DC current passes from described sensing head center hole.
Described DC current metering device, is characterized in that:
In described sensing head, described first annular detects iron core, the second annular detects iron core and annular magnetic shielding iron core, and each freedom is wound into the cold-reduced silicon sheet composition of ring-type after annealing in process; Described annular magnetic shielding iron core through assembled and form in have the circular of toroidal cavity.
Described DC current metering device, is characterized in that:
In described sensing head, described first annular detects iron core and the second annular detects iron core, detect iron core by first annulus separately and detect iron core composition with second annulus, first annulus detects iron core and second annulus detection iron core is made up of the cold-reduced silicon sheet being wound into semi-annular shape after annealing in process separately respectively;
Described first modulation detection winding and the first excitation detect winding and are all divided into two sections separately, and correspondence detects on iron core and second annulus detection iron core around first annulus that described first annular detects iron core respectively, is connected between two sections of windings by wire; Described second modulation detection winding and the second excitation detect winding and are all divided into two sections separately, and correspondence detects on iron core and second annulus detection iron core around first annulus that described second annular detects iron core respectively, is connected between two sections of windings by wire;
Described annular magnetic shielding iron core, be made up of 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 made up of the cold-reduced silicon sheet being wound into semi-annular shape after annealing in process separately respectively, through assembled and have the semi-annular shape of semi-circular shape cavity in formation;
Described feedback winding is divided into two sections, and corresponding first annulus magnetic shielding iron core around described annular magnetic shielding iron core is with on second annulus magnetic shielding iron core respectively, is connected between two sections of windings by wire.
The present invention detects on iron core and the second annular detection iron core in the first annular, be wound with the first modulation detection winding that the two cover numbers of turn are identical respectively, first excitation detects winding and the second modulation detection winding, second excitation detects winding, two excitations detect winding, first diode and the second diode, first resistance and the second resistance and driver transformer, form the D.C. current detecting system of power frequency positive half-wave based on magnetrol principle, direct current I/O characteristic based on the detection system of this magnetrol principle is simple substance, be adapted to the detection of large DC current signal especially, two modulation detection windings, the 3rd diode and the 4th diode and modulation transformer, form power frequency and bear the D.C. current detecting system of half-wave based on magnetic modulator principle, based on the direct current I/O characteristic of the detection system of this magnetic modulator principle, be adapted to little DC current signal especially as the detection near zero ampere-turn, its detection sensitivity is high, two annulars detect on iron core and are respectively wound with double winding, because they are operated in the positive half-wave of power frequency and negative half-wave respectively, and due to the specific polarity that described winding sets, not only can not produce mutual interference, and the cancelling out each other of issuable iron core remanent magnetism when being conducive to respectively being operated in half cycles, the output signal of magnetrol and magnetic modulator two kinds of Cleaning Principle, after low-pass filter, phase-sensitive demodulator, enters synthesis regulator, is superposed by the DC detecting signal of positive-negative half-cycle ripple, obtains the DC detecting signal of power frequency whole wave, the direct current I/O examine repair of this whole wave, both there is characteristic highly sensitive near magnetic modulator Cleaning Principle zero ampere-turn, also there is the simple substance characteristic of the large DC detecting signal of magnetrol principle, breach the falseness equilibrated zero point of the DC detecting characteristic that traditional magnetic modulation principle exists, non-simple substance thorny problem.The power frequency whole wave DC detecting signal that synthesis regulator exports, feedback winding input feedback electric current is given after power amplifier, realize the magnetic potential balance of feedback direct current ampere-turn and tested direct current ampere-turn, the accurate-metering of tens thousand of amperes of industrial DC electric currents can be realized, proportional precision reaches more than 2/10000ths, and this system full-automatic tracking and not unbalance, its stability, reliability are high, are applicable to commercial Application.
Accompanying drawing explanation
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
Below in conjunction with drawings and Examples, the present invention is further described.
Embodiments of the invention, comprise sensing head, driver transformer T
1, modulation transformer T
2, low-pass filter E, phase-sensitive demodulator F, synthesis regulator G and power amplifier H;
As shown in Figure 1 and Figure 2, described sensing head is annular, comprises the first annular and 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
1iron core C is detected with the second annular
2shape is identical, and the first annular detects iron core C
1outside 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; Second annular detects iron core C
2outside 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, is respectively wound with the first annular detection iron core C that two covers detect winding
1iron core C is detected with the second annular
2after superposition, entirety is placed in the toroidal cavity of annular magnetic shielding iron core C, is wound with feedback winding W outside annular magnetic shielding iron core C again
2;
Described 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, encourage with first simultaneously and detect winding W
d1same Name of Ends and the second excitation detect winding W
d2different name end be connected, driver transformer T
1the different name end of Secondary Winding, with the first resistance R
1with the second resistance R
2one end connect, the first resistance R
1the other end and the first diode D
1negative electrode be connected and connect the input end of low-pass filter E, the first diode D simultaneously
1anode and first encourage and detect winding W
d1different 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 second encourage and detect winding W
d2same Name of Ends be connected;
Described first modulation detection winding W
d1' Same Name of Ends and the 3rd diode D
3anode be connected, the 3rd diode D
3negative electrode connect modulation transformer T
2secondary Winding Same Name of Ends, the first modulation detection winding W
d1' 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 be connected, the 4th diode D
4anode connect modulation transformer T
2secondary Winding different name end, modulation transformer T
2secondary Winding center tap connect the input end of phase-sensitive demodulator F, the output terminal of phase-sensitive demodulator F and the output terminal of low-pass filter E are connected the input end of synthesis regulator G respectively, the output terminal of synthesis regulator G connects power amplifier H input end, power amplifier H output terminal and feedback winding W
2same Name of Ends be connected, feedback winding W
2different 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 that synthesis regulator G exports, gives feedback winding W after power amplifier H
2input 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
2.Usually a tested DC current I
1bus W
1be 1 circle, so feedback current I
2=I
1w
1/ W
2represent a tested DC current I exactly
1, coefficient of ratio W
1/ W
2for the tested turn ratio with feeding back winding, it is a constant.Feedback current I
2flow through measuring resistance R
sobtain voltage I
2r
s, to meet the needs of voltage signal sampling instrument.
As shown in Figure 1 and Figure 2, in the sensing head of the present embodiment, described first annular detects iron core C
1iron core C is detected with the second annular
2, 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 made up of the cold-reduced silicon sheet being wound into semi-annular shape after annealing in process respectively separately;
Described first modulation detection winding W
d1' and the first excitation detection winding W
d1all be divided into two sections separately, corresponding to described first annular detection iron core C respectively
1first annulus detect iron core and second annulus and detect on iron core, connected by wire between two sections of windings; Described second modulation detection winding W
d2' and the second excitation detection winding W
d2all be divided into two sections separately, corresponding to described second annular detection iron core C respectively
2first annulus detect iron core and second annulus and detect on iron core, connected by wire between two sections of windings;
Described annular magnetic shielding iron core C, be made up of 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 made up of the cold-reduced silicon sheet being wound into semi-annular shape after annealing in process separately respectively, through assembled and have the semi-annular shape of semi-circular shape cavity in formation;
Described feedback winding W
2be divided into two sections, corresponding first annulus magnetic shielding iron core around described annular magnetic shielding iron core C is with on second annulus magnetic shielding iron core respectively, is connected between two sections of windings by wire; First annulus magnetic shielding iron core and second annulus magnetic shielding iron core are spliced into circular entirety 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), synthesis regulator (G) and power amplifier (H), it is characterized in that:
Described sensing head is annular, comprises the first annular and 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 be 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); Second annular detects iron core (C
2) outside be 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, is respectively wound with the first annular detection iron core (C that two covers detect winding
1) and the second annular detection iron core (C
2) superposing the toroidal cavity that rear entirety is placed in annular magnetic shielding iron core (C), annular magnetic shielding iron core (C) outside is wound with feedback winding (W again
2);
Described 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 circle ~ 5000 circles; Described feedback winding (W
2) be 500 circle ~ 20000 circles;
Described driver transformer (T
1) the Same Name of Ends of Secondary Winding, encourage with first simultaneously and detect winding (W
d1) Same Name of Ends and the second excitation detect winding (W
d2) different name end be connected, driver transformer (T
1) the different name end of Secondary Winding, with the first resistance (R
1) and the second resistance (R
2) one end connect, the first resistance (R
1) the other end and the first diode (D
1) negative electrode be connected and connect the input end of low-pass filter (E), the first diode (D simultaneously
1) anode and first encourage and detect winding (W
d1) 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 second encourage and detect winding (W
d2) Same Name of Ends be connected;
Described first modulation detection winding (W
d1') Same Name of Ends and the 3rd diode (D
3) anode be connected, the 3rd diode (D
3) negative electrode connect modulation transformer (T
2) Secondary Winding Same Name of Ends, the first modulation detection winding (W
d1') 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 be connected, the 4th diode (D
4) anode connect modulation transformer (T
2) Secondary Winding different name end, modulation transformer (T
2) Secondary Winding center tap connect phase-sensitive demodulator (F) input end, output terminal and the output terminal of low-pass filter (E) of phase-sensitive demodulator (F) are connected the input end of synthesis regulator (G) respectively, the output terminal of synthesis regulator (G) connects power amplifier (H) input end, power amplifier (H) output terminal and feedback winding (W
2) Same Name of Ends be connected, feedback winding (W
2) different name end by measuring resistance (R
s) connect earth point;
During this DC current metering device work, the bus (W of a tested DC current
1) pass from described sensing head center hole.
2. DC current metering device as claimed in claim 1, is characterized in that:
In described sensing head, described first annular detects iron core (C
1), the second annular detects iron core (C
2) and annular magnetic shielding iron core (C), each freedom is wound into the cold-reduced silicon sheet composition of ring-type after annealing in process; Described annular magnetic shielding iron core (C) through assembled and form in have the circular of toroidal cavity.
3. DC current metering device as claimed in claim 1 or 2, is characterized in that:
In described sensing head, described first annular detects iron core (C
1) and the second annular detection iron core (C
2), 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 made up of the cold-reduced silicon sheet being wound into semi-annular shape after annealing in process respectively separately;
Described first modulation detection winding (W
d1') and the first excitation detection winding (W
d1) be all divided into two sections separately, corresponding to described first annular detection iron core (C respectively
1) first annulus detect iron core and second annulus and detect on iron core, connected by wire between two sections of windings; Described second modulation detection winding (W
d2') and the second excitation detection winding (W
d2) be all divided into two sections separately, corresponding to described second annular detection iron core (C respectively
2) first annulus detect iron core and second annulus and detect on iron core, connected by wire between two sections of windings;
Described annular magnetic shielding iron core (C), be made up of 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 made up of the cold-reduced silicon sheet being wound into semi-annular shape after annealing in process separately respectively, through assembled and have the semi-annular shape of semi-circular shape cavity in formation;
Described feedback winding (W
2) being divided into two sections, corresponding first annulus magnetic shielding iron core around described annular magnetic shielding iron core (C) is with on second annulus magnetic shielding iron core respectively, is connected between two sections of windings by wire.
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|---|---|---|---|
| CN201310199328.6A CN103308743B (en) | 2013-05-24 | 2013-05-24 | Direct current metering device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310199328.6A CN103308743B (en) | 2013-05-24 | 2013-05-24 | Direct current metering device |
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| CN103308743A CN103308743A (en) | 2013-09-18 |
| CN103308743B true CN103308743B (en) | 2015-05-06 |
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| CN201310199328.6A Expired - Fee Related CN103308743B (en) | 2013-05-24 | 2013-05-24 | Direct current metering device |
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Cited By (1)
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| CN104198796B (en) * | 2014-08-22 | 2019-03-12 | 安阳师范学院 | D.C. current detecting circuit and method based on transformer |
| 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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