CN1054668A - Novel Zero magnetic flow direct current mutual-inductor - Google Patents
Novel Zero magnetic flow direct current mutual-inductor Download PDFInfo
- Publication number
- CN1054668A CN1054668A CN 91101844 CN91101844A CN1054668A CN 1054668 A CN1054668 A CN 1054668A CN 91101844 CN91101844 CN 91101844 CN 91101844 A CN91101844 A CN 91101844A CN 1054668 A CN1054668 A CN 1054668A
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- China
- Prior art keywords
- iron core
- ferristor
- diode
- winding
- direct current
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Abstract
Novel Zero magnetic flow direct current mutual-inductor is a kind of D.C. high-current proving installation.It is made up of two parts, and a part is a sensor, is made of two-way ferristor; Another part is a topworks, and it is made of high-power double-iron core ferristor, and therefore, it is simple to have formed structure, and full machine does not have other electron devices except that diode, and heavy dc comparator stable and reliable for performance is suitable for commercial Application.
Description
The invention belongs to the D.C. high-current proving installation
Existing heavy dc comparator such as Canadian M.P.MacMartin, the magnetic modulation type dc comparator that N.L.Kusters developed (see IEEE Voi-MAG1, nineteen sixty-five 396-402 page or leaf); The Hall zero-detection formula heavy dc comparator that U.S. Kazakhstan horse (Halmar) electronics corporation produces (United States Patent 3323056, May 30.1967; 3885212 May 20.1975); The magnetic amplifier that W.Kraemar developed that West Germany G.E company produces (is seen IEEE Trans on CommunicaTion ﹠amp; Electronics No 71 1964.pp.382～390) heavy dc comparator etc. all is to utilize magnetic potential relatively, and promptly the magnetic potential that feedback current the produced principle of comparing with the magnetic potential that tested electric current is produced is made.Though their precision is high, be subjected to external magnetic field and influence of temperature variation also little, but structure is too complicated, is easy to damage, and the in-site measurement that even is not suitable for that has is used, as the magnetic modulation type dc comparator, it should modulate demodulation again, and link is many, the electronic circuit complexity, fragile, thereby can only be used for the laboratory or on-the-spot use as testing instruments.Hall zero-detection formula dc comparator it not only link is many, electronic circuit complexity, and passage is many, easy break-down, poor reliability.
Shortcoming according to above-mentioned prior art existence, the invention provides a kind of novel Zero magnetic flow direct current mutual-inductor (belonging to the magnetic amplifier type dc comparator), it adopts two-way quick ferristor as sensor, with single-phase double-iron core self-saturation amplifier as the power amplifier level, thereby it is very simple except that diode and do not have a dc comparator of other electron devices to constitute a kind of structure.
Structural principle of the present invention is shown in Fig. 1 (a).It comprises that two structures are identical, the ac driven circuit of parameter unanimity.When I=0, under the enough big situation of electrical source voltage, the current i a in two circuit
1, ia
2Be approximately the identical half-wave sine of size, since two circuit parameter unanimities, R
1=R
2=R, at this moment output voltage U
Ab=ia
1R
1=ia
2R
2=(ia
1-ia
2) R=0.Work as I
c≠ 0 o'clock, when electrical source voltage is the half-wave of bearing, I
cExcitation orientation opposite with ac-excited direction, it is to iron core T
1Demagnetizing effect is arranged, make current i a like this
1At electrical source voltage is that breach appears in positive initial time, and to the iron core T in the following circuit II
2, I
eExcitation orientation consistent with ac-excited direction, be under the situation of rectangle in the iron core magnetic characteristic, I
cTo iron core T
2Play any effect hardly, ia
2Still be the half-wave sine, its result makes output voltage U
Ab=(ia
1-ia
2) R presents negative value.
Big more Q
1Breach big more, U
AbJust negative greatly more.Otherwise, if I
cFlow on the contrary, then current i a
2At electrical source voltage is that breach appears in positive initial time, then U
AbPolarity also opposite, so output voltage average value U at this moment
AbWith I
cHave relation shown in Fig. 1 (b), like this, its control characteristic is compared with general single iron core ferristor and is just improved greatly.At this moment output voltage U
AbNot only can be with Control current I
cSize and change, and can be with electric current I
cThe flow direction and change polarity, so it has two-way control characteristic.According to above-mentioned principle, the structure of direct current instrument transformer provided by the present invention and principle of work mainly are made up of two parts as shown in Figure 2: a part is sensor, and it is two-way ferristor, another part is a topworks, and it is high-power double-iron core ferristor.Excitation winding W in sensor
1Pass through measured current I
1The time, present positive voltage at two-way ferristor output terminal, drive back double-iron core ferristor with this, thereby export a feedback current I
2, this electric current flows through balance winding W
2, the magnetic potential of generation one and tested opposite current in iron core is until this current increases is to balance winding W
2The magnetic potential W that produces
2I
2Magnetic potential W with tested electric current generation
1I
1Till equating, the electric current I of feedback
2Just keep this equilibrium state no longer to increase.At this moment in fact act on iron core T
1, T
2Differential direct current magnetic potential be W
1I
1-W
2I
2=△ F, when the open-loop gain of comparator was enough big, △ F was extremely small, at this moment W
1I
1 W
2I
2So, I
1=(W
2)/(W
1) I
2=KI
2, K is a direct current instrument transformer no-load voltage ratio coefficient in the formula.Therefore measure the electric current I in the balance winding
2, just can determine measured current I exactly
1Electric current I
2Can be according to the measuring resistance R that is in series with the balance winding
5On both end voltage fall U and decide.As shown in Figure 2, described two-way ferristor is by iron core T
1, T
2And excitation winding W
3, W
4, magnetic shielding T
3, balance winding W
2, diode D
1, D
2, resistance R
1, R
2And AC power e
1Form Deng part.It comprises two ac driven circuits, and the one exciting circuit is by AC power e
1, excitation winding W
3, diode D
1And resistance R
1Form, its current pathway is by power supply e
1The contact 1 of an end flow to power supply e through contact 2,3,8
1The other end, be excitation winding W between the contact 1 and 2
3, be diode D between 2 and 3
1, be resistance R between 3 and 8
1, another exciting circuit is by AC power e
1, excitation winding W
4, diode D
2And resistance R
2Form, its current pathway is by power supply e
1Same end flow to power supply e through contact 1,7,6,8
1The other end, be excitation winding W between the contact 1,7
4, be two utmost point D between 7,6
2, be resistance R between 6,8
2, its output voltage U
1Be subjected to I
1W
1And I
2W
2The effect of differential magnetic potential △ F.Described topworks double-iron core ferristor is by iron core T
4, T
5And control winding W
5, excitation winding W
6, W
7, weakening winding W
8, diode D
3, D
4, D
5, D
6, AC power e
2And resistance R
3Form, wherein D
3, D
4, D
5, D
6Constitute a bridge full-wave rectifier circuit, as AC power e
2Left end is timing, and its electric current is through excitation winding W
6, diode D
3, resistance R
3, diode D
5To AC power e
2The other end (right-hand member), its approach be by contact 10 through contact 11-12-13-14-15-17, be excitation winding W between the contact 10 and 11
6, be diode D between 11 and 12
3, be diode D between 15 and 17
5, be R between 13 and 14
3When the alternating current source right-hand member is timing, its electric current is through diode D
4, resistance R
3, diode D
6, excitation winding W
1To AC power e
2The other end (left end), its approach is to AC power e through contact 17-12-13-14-15-16-10
2The other end.Between the contact 12 and 17 diode D
4, be diode D between 15 and 16
6Flow to resistance R in AC supply voltage in the whole cycle like this
3Direction of current constant, play the full-wave rectification effect, but output voltage (resistance R
3Two terminal voltages) U
2Controlled winding W
5Middle electric current I
0Control.R among the figure
3With diode D
7Be a nonlinear network, in order to improve the linear relationship of comparator low side, capacitor C and resistance R
4With weakening winding W
8Series connection is connected across contact 13,20(ground end) two ends, its approach is 13-18-19-20-14, is capacitor C between the contact 13 and 18 wherein, is resistance R between 18 and 19
4, be weakening winding W between 19 and 20
8The real load of double-iron core ferristor is balance winding W
2, one end and diode D
7Negative electrode connect the other end and resistance R at contact 2
5Link at contact 22, the resistance other end is in contact 23 ground connection.
Outstanding advantage of the present invention is to adopt two-way ferristor, and is not only simple in structure, and time constant is little, and output impedance is little, utilizes it can directly promote power amplification as sensor.
Because the last topworks of the present invention has adopted the double-iron core ferristor again, therefore constituted present structure the simplest (full machine does not have other electron devices except that diode) the most reliable and the most stable heavy dc comparator of performance, it had not only kept direct current greatly than the advantage of instrument, but also reliable, was suitable for industrial use.
Fig. 1 (a) is two-way ferristor structure principle chart
Fig. 1 (b) is two-way ferristor U
Ab-I
cFamily curve.
Fig. 2 is novel Zero magnetic flow direct current mutual-inductor principle assumption diagram.
The present invention can provide following test data (table 1) through test
6000/2A Zero magnetic flow direct current mutual-inductor table 1
| I√I in | I 1(A) | Relative error r (%) |
| 0.2 | 1200 | +0.20 |
| 0.3 | 1800 | +0.08 |
| 0.4 | 2400 | +0.06 |
| 0.5 | 3000 | +0.04 |
| 0.6 | 3600 | -0.02 |
| 0.7 | 4200 | -0.06 |
| 0.8 | 4800 | -0.10 |
| 0.9 | 5400 | -0.14 |
| 10 | 6000 | -0.17 |
Annotate: I1nBe measured current I1Rated value
Claims (2)
1, a kind of Zero magnetic flow direct current mutual-inductor, it is by primary winding W
1, balance winding W
2And the additional device composition, it is characterized by full machine and formed by ferristor, it comprises two parts, and first's sensor is two-way ferristor, and second portion topworks is single-phase double-iron core ferristor.
2, direct current instrument transformer according to claim 1 is characterized by two-way ferristor and comprises two ac driven circuits that structure is identical, and one of them circuit is by AC power e
1, iron core T
1On excitation winding W
3, diode D
1And resistance R
1Form, they are connected in 1,2,3,8 points respectively, another circuit is by AC power e
1, iron core T
2On excitation winding W
4, diode D
2And resistance R
2Form, they are connected in 1,7,6,8 points respectively, primary winding W
1And balance winding W
2Around iron core T
1, T
2Last excitation winding W
3, W
4Magnetic shielding T
3On, high-power double-iron core ferristor is a bridge full-wave rectifier circuit, it is by diode D
3, D
4, D
5, D
6AC power e
2And resistance R
3, iron core T
4, T
5Last excitation winding W
6, W
7Form, they are respectively at 10,11,12,17,15,16 connections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91101844 CN1017938B (en) | 1991-03-21 | 1991-03-21 | Zero magnetic flow direct current mutual-inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91101844 CN1017938B (en) | 1991-03-21 | 1991-03-21 | Zero magnetic flow direct current mutual-inductor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1054668A true CN1054668A (en) | 1991-09-18 |
| CN1017938B CN1017938B (en) | 1992-08-19 |
Family
ID=4905300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91101844 Expired CN1017938B (en) | 1991-03-21 | 1991-03-21 | Zero magnetic flow direct current mutual-inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1017938B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102129059A (en) * | 2011-01-19 | 2011-07-20 | 四川电力科学研究院 | 5-kA zero-track DC (Direct Current) comparator for calibrating current transformer |
| CN102360049A (en) * | 2011-09-05 | 2012-02-22 | 华中科技大学 | Virtual zero point detector for magnetic modulators |
| CN102854373A (en) * | 2012-04-25 | 2013-01-02 | 中国科学院等离子体物理研究所 | PWM (Pulse-Width Modulation) three-level digital controller of zero-flux Hall large-current sensor |
| CN102879624A (en) * | 2012-09-06 | 2013-01-16 | 华中科技大学 | Direct-current-free magnetized bidirectional magnetic amplifier for direct-current large current detection |
| CN106226578A (en) * | 2016-07-13 | 2016-12-14 | 国网天津市电力公司 | A kind of large direct current measuring method based on magnetic amplifier principle |
| CN108132375A (en) * | 2017-12-25 | 2018-06-08 | 天津百利机械装备集团有限公司中央研究院 | A kind of direct current measuring devices and measuring method of band feedforward |
| CN108375690A (en) * | 2018-02-02 | 2018-08-07 | 华中科技大学 | A kind of two-way magnetic amplifier of single iron core for direct current detection |
-
1991
- 1991-03-21 CN CN 91101844 patent/CN1017938B/en not_active Expired
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102129059A (en) * | 2011-01-19 | 2011-07-20 | 四川电力科学研究院 | 5-kA zero-track DC (Direct Current) comparator for calibrating current transformer |
| CN102360049A (en) * | 2011-09-05 | 2012-02-22 | 华中科技大学 | Virtual zero point detector for magnetic modulators |
| CN102360049B (en) * | 2011-09-05 | 2013-06-19 | 华中科技大学 | Virtual zero point detector for magnetic modulators |
| CN102854373A (en) * | 2012-04-25 | 2013-01-02 | 中国科学院等离子体物理研究所 | PWM (Pulse-Width Modulation) three-level digital controller of zero-flux Hall large-current sensor |
| CN102854373B (en) * | 2012-04-25 | 2014-07-09 | 中国科学院等离子体物理研究所 | PWM (Pulse-Width Modulation) three-level digital controller of zero-flux Hall large-current sensor |
| CN102879624A (en) * | 2012-09-06 | 2013-01-16 | 华中科技大学 | Direct-current-free magnetized bidirectional magnetic amplifier for direct-current large current detection |
| CN102879624B (en) * | 2012-09-06 | 2014-12-17 | 华中科技大学 | Direct-current-free magnetized bidirectional magnetic amplifier for direct-current large current detection |
| CN106226578A (en) * | 2016-07-13 | 2016-12-14 | 国网天津市电力公司 | A kind of large direct current measuring method based on magnetic amplifier principle |
| CN108132375A (en) * | 2017-12-25 | 2018-06-08 | 天津百利机械装备集团有限公司中央研究院 | A kind of direct current measuring devices and measuring method of band feedforward |
| CN108132375B (en) * | 2017-12-25 | 2020-03-27 | 天津百利机械装备集团有限公司中央研究院 | Direct current measuring device with feedforward and measuring method |
| CN108375690A (en) * | 2018-02-02 | 2018-08-07 | 华中科技大学 | A kind of two-way magnetic amplifier of single iron core for direct current detection |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1017938B (en) | 1992-08-19 |
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