CN1006007B - Multichannel open-type heavy d.c. comparator - Google Patents
Multichannel open-type heavy d.c. comparator Download PDFInfo
- Publication number
- CN1006007B CN1006007B CN85100829.1A CN85100829A CN1006007B CN 1006007 B CN1006007 B CN 1006007B CN 85100829 A CN85100829 A CN 85100829A CN 1006007 B CN1006007 B CN 1006007B
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- iron core
- winding
- comparator
- measuring head
- feedback
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Abstract
The present invention relates to a heavy direct current comparator which is composed of a measuring head, a band-pass filter, a demodulation synchronous generator, a phase-sensitive demodulator, a direct current voltage amplifier and a direct current power amplifier. The comparator is provided with a plurality of channels, wherein no electric communication exists among channels, each channel is an independent unit, a feedback winding of each channel is corresponding to an excitation winding, and a set of electronic circuits is corresponding to each channel. In the present invention, the measuring head is in a half cut opening structure, a main iron core and an excitation winding wound around the same are covered in a shielding iron core, a feedback winding is wound around the shielding iron core, and the feedback windings of the channels are distributed uniformly around the measuring head. The device can be used in the state of no power cut for checking and detecting heavy direct current.
Description
The invention belongs to the electrical instrument class.
The measurement of the big electric current of industrial DC based on different principles and method, forms various surveying instruments, because service condition is abominable, and many devices, the confidence level of precision is poor.So,, particularly under operation ground normal production conditions, accurately, quickly and easily operating surveying instrument is carried out verification, become a technical barrier that merits attention for the periodic check problem of surveying instrument.
In the prior art, with the present invention the most approaching be to be published in the technology contents described in China's " TV and instrument " " application of open type comparator in the D.C. high-current field test " literary composition on the 6th phase in 1984.What this article related to is a kind of single channel open type heavy dc comparator, though it can be used as the reference instrument that the big electric current field-checking of industrial DC is used, and the characteristics extremely similar to the present invention are arranged, for example, the measuring accuracy height, the linearity is good, strong, the anti-machinery of antimagnetic ability, electromagnetic impact etc., but these are applicable to when measuring the following bus current of 25～30KA and could guarantee above-mentioned performance.As if the bus current that this single channel formula heavy dc comparator is used to measure more than the 30KA, then must be with the volume of this comparator, size is correspondingly done more greatly, and suitably increase encourages the winding and the number of turn of feeding back winding, and the distributed areas of winding on the measuring head periphery, but because enough big measuring head is subjected to the influence by another bus of powerful electric current, make that the magnetic field intensity in the measuring head periphery upper core is inhomogeneous, this moment is if still adopt single channel formula heavy dc comparator, be subjected to the influence in magnetic field in will causing for above-mentioned reasons measuring and make the measuring accuracy of comparator descend greatly and other reduction of property indexes, thereby can't realize standard set-up as the above D.C. high-current field-checking of 30KA.
At the deficiencies in the prior art and problem, the objective of the invention is with hyperchannel and the dual anti-magnetic principle of magnetic shielding, solve more than the 30KA, based on the measuring accuracy of the open type direct current high capacity comparator of magnetic modulation principle, and provide 30KA the field-checking standard set-up of above all kinds of large direct current measuring devices.
The present invention adopts measuring head main iron core (2) and the main iron core (3) that turns to round or square after the annealed processing of conventional cold-reduced silicon sheet.The measuring head dissectible is two halves, forms the hatch frame of similar pincerlike meter.On the main iron core (2) of measuring head, (3), be wound with excitation winding (4), (5) of a plurality of passages respectively.Main iron core (2), (3) and excitation winding (4), (5) place among the shielding iron core (8), the end reversal connection of the same name of excitation winding (4), (5), common port (6) ground connection; Feedback winding (9) is around the outside of magnetic shielding iron core (8), and the feedback winding (9) of each passage is corresponding on magnetic circuit with excitation winding (4), (5) of this passage, and the feedback winding (9) of each passage and excitation winding (4), (5) evenly distribute along the periphery of measuring head iron core.Do not have the contact of electricity between each passage winding, be furnished with the electronic circuit that a cover comprises bandpass filter, synchronizing generator, phase-sensitive demodulator, direct current amplifier and amplidyne separately, have independently unit of one's own.When measuring electric current, tested dc bus (7) is passed from main iron core (2), (3) and shielding iron core (8),, can converse the current value on the charged bus (7) by measuring the ohmically voltage signal of standard in each passage.
Said main iron core adopts the cold-reduced silicon sheet of annealed processing to turn to the iron core that the cross section is required type shape.
Multichannel open-type heavy dc comparator according to structure of the present invention constitutes can still can reach sufficiently high measuring accuracy when measuring D.C. high-current, key is the anti-magnetic property of self, and its anti-magnetic principle is as follows:
For heavy dc comparator when measuring 100KA or bigger electric current, because the circle diameter of measuring head is enough big, then another root loop bus of heavy-current bus-bars will be to the magnetic field intensity of the different sizes of the each point effect on the measuring head iron core circumference with the big electric current on other connecting line, the present invention utilizes the excitation line group of each passage on the measuring head circumference corresponding on the magnetic circuit position with the feedback winding just, the different big or small magnetic field that each passage detects according to the excitation winding, automatically regulate the electric current of respective feedback winding, keep the ampere-turn equilibrium of each passage, to realize except utilizing second kind of antimagnetic antimagnetic function of magnetic shielding iron core (8).Promptly adopt excitation winding and feedback winding corresponding measure on the magnetic circuit position of each passage, make that respectively to feed back ampere-turn strictly corresponding with the detection signal in each excitation winding, thereby reach a kind of antimagnetic effect that need not antimagnetic material.Here it is dual anti-magnetic principle of the present invention.
Accompanying drawing 1: be each passage schematic diagram of the big current comparator of multichannel open-type;
Accompanying drawing 2: be the version synoptic diagram of the measuring head shown in the accompanying drawing 1.
Among Fig. 1, by resistance (10), (12), (14), (15), (17), (20), electric capacity (11), (18) and operational amplifier (13), (16), (19) second harmonic band-pass filter of composition 100 He Zhi, lead (21), (22), (23) respectively with operational amplifier (13), (19), (16) positive pole with D.C. regulated power supply (91) links, lead (24), (25), (26) respectively with operational amplifier (13), (19), (16) negative pole with D.C. regulated power supply (92) links operational amplifier (13), (16), (19) in-phase input end (27), (28), (29) equal ground connection.
Transformer (30), semiconductor diode (31), (32), (33), (34), telefault (35), electric capacity (37), (41), resistance (36), (38), (40) and transistor (39) are formed the second harmonic synchronizing generator of 100 He Zhi.50 He Zhi voltage signals of transformer (30) output are after the single-phase full wave rectification that semiconductor diode is formed, be added on the series load of telefault (35) and resistance (36), two end signals that take out resistance (36) are behind electric capacity (37) isolated DC level, be added on the base stage of transistor (39), the emitter-base bandgap grading output signal of triode (39) is given phase-sensitive demodulator through electric capacity (41) coupling, and demodulation synchronization signal is provided.
Transformer (42), potentiometer (43), (48), semiconductor diode (44), (46), (49), (51), phase-sensitive demodulator is formed in resistance (45), (47), (50) (52), and potentiometer (43), (48) are in order to regulate the asymmetry of input signal.
Resistance (62), (63), (66), potentiometer (65), electric capacity (64) and operational amplifier (67) are formed DC voltage amplifier.Electric capacity (64), potentiometer (65) is formed the system compensation network.
Resistance (68), (69), (71), (76), (79), (80), (82), (83), (87), operational amplifier (70), stabilivolt (72), (73), potentiometer (74), (75), amplidyne is formed in transistor (78), (81), (84).The input direct current signal is added to the input end of operational amplifier (70) through resistance (68), its output signal is after stabilivolt (72), (73) level shift, be added to the base stage of triode (78) through potentiometer (74), (75), potentiometer (74), (75) are used for regulating quiescent point.Signal is added on the base stage of triode (81) by collector output after triode (78) amplifies, hybrid power tube is formed in triode (81), (84), resistance (87) provides the static working current loop, and power amplifier level electric current is exported through resistance (83) by triode (84).
The magnetic modulation signal is by secondary winding center tap (95) output of constant-voltage transformer (1), give the input pickup resistance (10) of bandpass filter through lead (96), signal after filtering by operational amplifier (13), (16) output terminal (97), (98) output, through electric capacity (53), (56), resistance (54), (55) coupling is added on the phase-sensitive demodulator, signal after the demodulation is from separating voltage regulator/transformer center tap (99) output, via electric capacity (58), (59) and the π type elimination ripple formed of resistance (57), and through triode (60), the emitter-follower that resistance (61) is formed is to the output terminal resistance (62) of direct current amplifier, direct current signal after the amplification is added on the power amplifier through resistance (68), marking current after power amplification flows through contact (100) and semiconductor diode (86) is sent back in the feedback winding (9) of magnetic modulator, ampere turns in the maintenance feedback winding (9) and the ampere turns in the tested current bus bar (7) balance each other, and keep zero magnetic flux state.Electric current in the tested bus of current tracking (7) in feedback winding (9) will feed back current value in the winding (9) and multiply by constant no-load voltage ratio coefficient, promptly gets tested current value.Feedback winding (9) is connected with measuring resistance (94), and the size of feedback current is pressed signal output by measuring resistance (9), (94) power taking.
Be connected to diode (93) between one tip node (101) of semiconductor diode (86) and the measuring resistance (94), and be connected to diode (85), (88) between the power supply.The negative pole of diode (85) is connected to the positive pole of direct supply (89), and the positive pole of diode (88) is connected to the negative pole of direct supply (90).
Semiconductor diode (86) plays the effect of isolating the DC current between each passage.The feedback winding of big current comparator of the present invention is to inject feedback current by diode (86), and the excitation winding of each passage is all around same main iron core (2), (3) on, because the excitation winding of each passage is positioned under the environment of different big or small magnetic field intensitys, tracking through electronic circuit is handled, make the voltage of each passage feedback winding, the magnetic field situation that the excitation winding of size of current and respective channel is acted on interrelates, it is the electric current of each passage feedback winding, voltage does not wait, make contact (101) current potential of a certain passage be higher than contact (100) current potential of another passage, and each channel current is to go up addition in measuring resistance (94).If there is not diode (86).Then cause circulation between each passage, generation voltage, scurrying of electric current are scratched, and the measuring error that causes is very big.Diode (86) has just played between the channel isolation electric current at this and has scurried the effect of scratching.
Diode (85), (88), (93) have been used for superpotential and afterflow protective effect on the one hand.When the power remove of comparator or folding, exist the strong magnetic field energy in the feedback winding, this energy will pass through fly-wheel diode (93) release.This magnetic field energy can also be added to by ground wire and cause the over-voltage breakdown electronic devices and components on the electronic circuit simultaneously, and the effect of overvoltage protection is just played in the effect of diode (85), (88).In addition, diode (93), (85), (88) also provide current return for the ripple current in feedback winding (9), make feedback winding (9) play the draw up effect of winding of ripple again, have avoided a lot of ripple of the coiling number of turn again winding of drawing up.
The heavy dc comparator that utilizes structure of the present invention to constitute, its anti-magnetic property improves ten times even tens times than the anti-magnetic property of single channel principle.As 100, the device current ratio precision of 000A reaches 5/100000ths (5 * 10
-5).Complete machine voltage signal precision reaches 3/10000ths (0.03%), and the amount of having limit wide ranges, can be from 5, and 000A～100,000A even all unrestricted more than the hundreds of thousands ampere.The amount limit of prior art is 30, and below the 000A, 30, when 000A was above, its measuring accuracy can't guarantee.
But branch unit of device of the present invention verification in per 10～20 minutes, the verification of general arrangement is as long as close measuring head, and the opening reproducibility error of measuring head is 2/100000ths (2 * 10
-5).But this device bringing onto load electric current full-automatic tracking starting, under live state, carry out the verification and the on-line measurement of D.C. high-current, can save the loss (this class factory power failure one-day loss reaches more than 100 ten thousand yuans of hundreds of thousands to) that applying unit has a power failure and causes, avoided the censorship transportation, the economic loss in the censorship cycle.Through on-the-spot periodic check, realize that the scientific basis of preferable electrolysis process process and accounting electrolytic efficiency only improve 0.5%, the electrification of annual China, electrometallurgy * industry just can be economized on electricity more than 100,000,000 degree.
Claims (3)
1, a kind of multichannel open-type heavy dc comparator, comprise the main iron core of making by siliconized plate (2), (3) shielding iron core (8), excitation winding (4), (5), the measuring head of feedback winding (9) and electronic circuit are formed, it is characterized in that, main iron core (2) at said measuring head, (3) be wound with the excitation winding (4) of a plurality of passages on respectively, (5), a plurality of multichannel feedback windings (9) are arranged outside magnetic shielding iron core (8), the feedback winding (9) of each passage and the excitation winding (4) of this passage, (5) corresponding on magnetic circuit, and the feedback winding (9) of each passage and excitation winding (4), (5) periphery along the measuring head iron core evenly distributes.
2,, it is characterized in that the output terminal contact (100) of said electronic circuit intermediate power amplifier and feed back between the winding (9) that diode (86) is arranged by the said big current comparator of claim 1.
3, by the said big current comparator of claim 2, it is characterized in that said power amplifier output terminal contact (100) has diode (93) between contact (101) behind the diode (86) and measuring resistance (94), and diode (85), (88) are arranged between the power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85100829.1A CN1006007B (en) | 1985-04-01 | 1985-04-01 | Multichannel open-type heavy d.c. comparator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85100829.1A CN1006007B (en) | 1985-04-01 | 1985-04-01 | Multichannel open-type heavy d.c. comparator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85100829A CN85100829A (en) | 1987-01-17 |
| CN1006007B true CN1006007B (en) | 1989-12-06 |
Family
ID=4791454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85100829.1A Expired CN1006007B (en) | 1985-04-01 | 1985-04-01 | Multichannel open-type heavy d.c. comparator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1006007B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102360049B (en) * | 2011-09-05 | 2013-06-19 | 华中科技大学 | Virtual zero point detector for magnetic modulators |
| CN107589282A (en) * | 2017-10-17 | 2018-01-16 | 云南电网有限责任公司电力科学研究院 | System occurs for a kind of high current |
| CN110676038A (en) * | 2018-07-02 | 2020-01-10 | 福迪威（上海）工业仪器技术研发有限公司 | Current transformer |
| CN111398650B (en) * | 2020-06-04 | 2020-10-09 | 华中科技大学 | Quick response direct current comparator based on multisensor fuses |
| CN113866477B (en) * | 2021-08-30 | 2022-07-05 | 中国人民解放军海军工程大学 | Four-magnetic-core six-coil magnetic modulation high-precision ultra-large aperture current detection method and system |
| CN115684701B (en) * | 2023-01-01 | 2023-04-18 | 华中科技大学 | High-resolution wide-range magnetic modulation type direct current sensor based on differential demodulation |
-
1985
- 1985-04-01 CN CN85100829.1A patent/CN1006007B/en not_active Expired
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| Publication number | Publication date |
|---|---|
| CN85100829A (en) | 1987-01-17 |
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