CN108226610A - A kind of clamp measuring device for alternating current-direct current low current - Google Patents
A kind of clamp measuring device for alternating current-direct current low current Download PDFInfo
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- CN108226610A CN108226610A CN201810218244.5A CN201810218244A CN108226610A CN 108226610 A CN108226610 A CN 108226610A CN 201810218244 A CN201810218244 A CN 201810218244A CN 108226610 A CN108226610 A CN 108226610A
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- 238000001514 detection method Methods 0.000 claims abstract description 157
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 107
- 238000004804 winding Methods 0.000 claims abstract description 106
- 239000003990 capacitor Substances 0.000 claims abstract description 11
- 230000008878 coupling Effects 0.000 claims abstract description 10
- 238000010168 coupling process Methods 0.000 claims abstract description 10
- 238000005859 coupling reaction Methods 0.000 claims abstract description 10
- 229910000889 permalloy Inorganic materials 0.000 claims description 7
- 238000000137 annealing Methods 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
Abstract
The present invention discloses a kind of clamp measuring device for alternating current-direct current low current, and device includes sensing head, modulation transformer, bandpass filter, phase-sensitive demodulator, dc amplifier, power amplifier, ac filter amplifier, coupling capacitor and measuring resistance；Sensing head includes the U-shaped detection iron core of upper and lower semi-ring, and the U-shaped detection iron core of upper half ring includes first and second semi-ring and detects iron core, and the lower U-shaped detection iron core of semi-ring includes third and fourth semi-ring and detects iron core；First, second and third and four semi-ring detection iron core be wound with first, second and third and four modulation detection windings respectively；It is wound with the five, the six exchange detection windings respectively outside the upper and lower U-shaped detection iron core of semi-ring, is integrally placed at after assembly in half cavity of the annular magnetic shielding iron core being made of two halves annular magnetic shielding iron core, feedback winding is wound with outside annular magnetic shielding iron core.Modulation detection winding is realized respectively with detection winding is exchanged to tested current DC, AC compounent measurement, and then realizes the measurement of alternating current-direct current low current.
Description
Technical field
The invention belongs to the current measure devices in electrotechnics, more particularly to a kind of clamp for alternating current-direct current low current
Measuring device.
Background technology
" a kind of DC low current clamp measuring device " of application number 201510854478.5, for existing clamp direct current
Flow measuring apparatus for sensitivity during industry spot small DC current measurement, precision is inadequate the problem of, it is proposed that sensing head is
The forceps type structure of upper and lower two semi-ring detects iron core using the first semi-ring in the U-shaped detection iron core of permalloy material composition upper half ring
Third semi-ring detection iron core and the 4th semi-ring detection iron core in iron core and the U-shaped detection iron core of lower semi-ring are detected with the second semi-ring,
The U-shaped detection core structure of upper and lower semi-ring self-contained closing had both realized permalloy material and has been not required to machine cuts, opening, ensured
Its intact magnetic property, but the open type for realizing upper and lower semi-ring clamps type structure, suitable for industry spot application.This is right
It is meaningful in the small DC current of in-site measurement.But there are following defects：Industry spot AC and DC Weak current is general
All over existing, direct current can be surveyed, also can test cross stream, application prospect more user is badly in need of, and here it is the present invention to solve
The problem of.
Invention content
The present invention provides a kind of clamp measuring device for alternating current-direct current low current, solves existing sensing head and measuring device
The problem of DC low current can only be measured, is used for the measurement of AC and DC low current with easy, stable operation structure.
To achieve the above object, the present invention provides a kind of clamp measuring device for alternating current-direct current low current, which surveys
Amount device includes：
Sensing head, modulation transformer, bandpass filter, phase-sensitive demodulator, dc amplifier, power amplifier, exchange filter
Twt amplifier, coupling capacitor and measuring resistance；
Sensing head includes the U-shaped detection iron core of upper half ring, the U-shaped detection iron core of lower semi-ring, wherein, the U-shaped detection iron core of upper half ring
Including forming the first semi-ring detection iron core of closing U-shaped structure and the second semi-ring detection iron core, the lower U-shaped detection iron core of semi-ring includes
Form the third semi-ring detection iron core of closing U-shaped structure and the 4th semi-ring detection iron core；
The first modulation detection winding is wound with outside first semi-ring detection iron core, second is wound with outside the second semi-ring detection iron core
Modulation detection winding is wound with third modulation detection winding outside third semi-ring detection iron core, outside the 4th semi-ring detection iron core around
There is the 4th modulation detection winding；The 5th exchange detection winding, the lower U-shaped detection iron of semi-ring are wound with outside the U-shaped detection iron core of upper half ring
The 6th exchange detection winding is wound with outside core；
It is wound with the first semi-ring detection of the first modulation detection winding, the second modulation detection winding and the 5th exchange detection winding
Iron core and the second semi-ring detection iron core, are placed in the cavity of the first semi-circular magnetic screen iron core；Be wound with third modulation detection winding,
4th modulation detection winding and the third semi-ring detection iron core of the 6th exchange detection winding and the 4th semi-ring detection iron core, are placed in the
In the cavity of two semi-circular magnetic screen iron cores；First semi-circular magnetic screen iron core and the second semi-circular magnetic screen iron core form annulus
Shape, feedback winding are around on the first semi-circular magnetic screen iron core and the second semi-circular magnetic screen iron core；
The different name end of the first modulation detection winding is connected with the Same Name of Ends of the 4th modulation detection winding, third modulation inspection
The Same Name of Ends for surveying winding is connected with the different name end of the second modulation detection winding；The Same Name of Ends of first modulation detection winding becomes with modulation
The Same Name of Ends of depressor secondary winding is connected, and the Same Name of Ends of the second modulation detection winding is connected to the different of modulation transformer secondary winding
Name end, the different name end of the 4th modulation detection winding is connected with the different name end of third modulation detection winding with earth point simultaneously；Modulation
The input terminal of the related bandpass filter of centre cap of transformer secondary winding, the output terminal of bandpass filter are connected to phase demodulation
The input terminal of device, the output terminal of phase-sensitive demodulator are connected with the input terminal of dc amplifier, the output terminal connection of dc amplifier
The input terminal of power amplifier, the output terminal of power amplifier are connected with the Same Name of Ends of feedback winding, the different name end of feedback winding
Earth point is connected by measuring resistance；The Same Name of Ends of 5th exchange detection winding is connected with earth point, the 5th exchange detection winding
Different name end be connected to the 6th exchange detection winding Same Name of Ends, the 6th exchange detection winding different name end be connected to ac filter
The input terminal of amplifier, the output terminal of waves AC filter amplifier are connected to one end of coupling capacitor, coupling capacitor it is another
End is connected to the Same Name of Ends of feedback winding.
Further, feedback winding is divided into two sections, one section uniformly around outside the first semi-circular magnetic screen iron core, it is another
Uniformly around outside the second semi-circular magnetic screen iron core, the feedback winding of two sections of deciles is connected section by conducting wire.
Further, the U-shaped detection iron core of upper half ring and the U-shaped detection iron core of lower semi-ring, are wound into U-shaped with permalloy tape
Afterwards by making annealing treatment.
Further, the first semi-circular magnetic screen iron core and the second semi-circular magnetic screen iron core after annealed processing by rolling up
The cold-reduced silicon sheet for being coiled into semi-annular shape is made.
In general, by the above technical scheme conceived by the present invention compared with prior art, it can obtain down and show
Beneficial effect：
The present invention is wound with the 5th exchange detection winding outside the U-shaped detection iron core of upper half ring, in the U-shaped detection iron core of lower semi-ring
Outside is wound with the 6th exchange detection winding, and two exchange detection windings are connected in series with by conducting wire, forms to tested primary electricity
The detection of ac current signal in stream, the acquisition of the alternating-current detection signal are not required in addition increase detection iron core, utilize upper and lower semi-ring
U-shaped permalloy detection iron core can be achieved with, therefore the U-shaped detection iron core of semi-ring up and down, can detect direct current, can also detect exchange
Current signal achievees the effect that a core is mostly used.
Five, the 6th exchange detection windings obtain secondary AC by after alternating-current detection signal input AC filter amplifier
The coupled capacitor of electric current, input feedback winding obtain the magnetic potential balance of primary measured exchange ampere-turn and secondary AC ampere-turn
WPI1A=WFI2A, secondary AC electric current I2A=(WP/WF)I1AAccurately reflect and be tested an alternating current, the coefficient of ratio is fixes
Turn ratio WP/WF；DC low current measures a kind of similarly aforementioned prior art " DC low current clamp measuring device ", this hair
The bright accurate measurement for realizing alternating current-direct current low current forceps type structure.
Description of the drawings
Fig. 1 is the structure diagram provided by the present invention for sensing head in the clamp measuring device of alternating current-direct current low current；
Fig. 2 (a) is section provided by the present invention for part on sensing head in the clamp measuring device of alternating current-direct current low current
Face schematic diagram；Fig. 2 (b) is section provided by the present invention for sensing head lower part in the clamp measuring device of alternating current-direct current low current
Face schematic diagram；
Fig. 3 is the circuit diagram of the clamp measuring device for alternating current-direct current low current of the present invention.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
It does not constitute a conflict with each other and can be combined with each other.
As shown in Figure 1, the sensing head external form of the present invention is annular shape, section such as Fig. 2 (a) and Fig. 2 (b) are shown, upper half
The U-shaped detection iron core A of ring includes the first semi-ring detection iron core C for forming closing U-shaped structure1With the second semi-ring detection iron core C2, lower half
The U-shaped detection iron core B of ring includes the third semi-ring detection iron core C for forming closing U-shaped structure3With the 4th semi-ring detection iron core C4；Upper half
The U-shaped detection iron core A and U-shaped detection iron core B of lower semi-ring of ring, with permalloy tape be wound into it is U-shaped after by making annealing treatment；
First semi-ring detection iron core C1Outside is wound with the first modulation detection winding W1, the second semi-ring detection iron core C2Outside around
There is the second modulation detection winding W2, third semi-ring detection iron core C3Outside is wound with third modulation detection winding W3, the detection of the 4th semi-ring
Iron core C4Outside is wound with the 4th modulation detection winding W4.The 5th exchange detection winding W is wound with outside the U-shaped detection iron core A of upper half ring5,
The 6th exchange detection winding W is wound with outside the lower U-shaped detection iron core B of semi-ring6, it is integrally placed at after assembly by the first semi-circular magnetic cup
In half cavity for covering the annular magnetic shielding iron core C of iron core and the second semi-circular magnetic screen iron core composition, outside annular magnetic shielding iron core C
Face is wound with feedback winding WF, annular magnetic shielding iron core C annealing cold-reduced silicon sheet be made.
Sensing head provided by the invention is wound with the 5th exchange detection winding outside the U-shaped detection iron core of upper half ring, in lower half
The 6th exchange detection winding is wound with outside the U-shaped detection iron core of ring, two exchange detection windings by conducting wire are connected in series with, are formd
To being tested the detection of ac current signal in primary current, the acquisition of the alternating-current detection signal is not required in addition increase detection iron core,
It can be achieved with, therefore the U-shaped detection iron core of semi-ring up and down using the U-shaped permalloy detection iron core of upper and lower semi-ring, direct current can be detected,
Also ac current signal can be detected, achievees the effect that a core is mostly used.
Fig. 3 be provided by the present invention for alternating current-direct current low current clamp measuring device structure diagram, including sensing head,
Modulation transformer T, bandpass filter E, phase-sensitive demodulator F, dc amplifier G, ac filter amplifier K, power amplifier H,
Measuring resistance RsAnd coupling capacitor C0。
Wherein, the first modulation detection winding W1Different name end and the 4th modulation detection winding W4Same Name of Ends be connected, third tune
Detection winding W processed3Same Name of Ends and the second modulation detection winding W2Different name end be connected；First modulation detection winding W1It is of the same name
End is connected with the Same Name of Ends of modulation transformer T secondary windings, the second modulation detection winding W2Same Name of Ends be connected to modulation transformation
The different name end of device T secondary windings, the 4th modulation detection winding W4Different name end and third modulation detection winding W3Different name end simultaneously
It is connected with earth point；The input terminal of the centre cap connection bandpass filter E of modulation transformer T secondary windings, bandpass filter E
Output terminal be connected to the input terminal of phase-sensitive demodulator F, the output terminal of phase-sensitive demodulator F and the input terminal phase of dc amplifier G
Even, the input terminal of the output terminal connection power amplifier H of dc amplifier G, output terminal and the feedback winding W of power amplifier HF
Same Name of Ends be connected, feedback winding WFDifferent name end pass through measuring resistance RSConnect earth point；5th exchange detection winding W5It is same
Name end is connected with earth point, the 5th exchange detection winding W5Different name end be connected to the 6th exchange detection winding W6Same Name of Ends,
Six exchange detection winding W6Different name end be connected to the input terminal of ac filter amplifier K, the output terminal of waves AC filter amplifier K
It is connected to coupling capacitor C0One end, coupling capacitor C0The other end be connected to feedback winding WFSame Name of Ends.Feedback winding
WFTwo sections are divided into, respectively uniformly around outside the magnetic screen iron core of upper and lower semicircular ring sensing head, is connected by conducting wire.
After the present apparatus puts into operation, the 5th exchange detection winding W5Detection winding W is exchanged with the 6th6By alternating-current detection signal
It is superimposed, after superposed signal input AC amplifier K, obtains secondary AC electric current I2ACoupled capacitor C0, input feedback around
Group WF, obtain primary measured alternating current I1AWith secondary AC electric current I2AAmpere-turn magnetic potential balance WPI1A=WFI2A, secondary AC
Electric current I2A=(WP/WF)I1AAccurately reflect and be tested an alternating current I1A, the coefficient of ratio is fixed turn ratio WP/WF；Directly
A kind of small current measurement similarly aforementioned prior art " DC low current clamp measuring device " is flowed, it is small that the present invention realizes alternating current-direct current
The accurate measurement of electric current forceps type structure.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all any modification, equivalent and improvement made all within the spirits and principles of the present invention etc., should all include
Within protection scope of the present invention.
Claims (4)
1. a kind of clamp measuring device for alternating current-direct current low current, which is characterized in that including：Sensing head, modulation transformer
(T), bandpass filter (E), phase-sensitive demodulator (F), dc amplifier (G), power amplifier (H), ac filter amplifier
(K), coupling capacitor (C0) and measuring resistance (Rs)；
Sensing head includes the U-shaped detection iron core of upper half ring, the U-shaped detection iron core of lower semi-ring, wherein, the U-shaped detection iron core of upper half ring includes
Form the first semi-ring detection iron core (C of closing U-shaped structure1) and the second semi-ring detection iron core (C2), the lower U-shaped detection iron core of semi-ring
Third semi-ring detection iron core (C including forming closing U-shaped structure3) and the 4th semi-ring detection iron core (C4)；
First semi-ring detection iron core (C1) outside be wound with the first modulation detection winding (W1), the second semi-ring detection iron core (C2) outside
It is wound with the second modulation detection winding (W2), third semi-ring detection iron core (C3) outside be wound with third modulation detection winding (W3), the 4th
Semi-ring detection iron core (C4) outside be wound with the 4th modulation detection winding (W4)；The 5th exchange is wound with outside the U-shaped detection iron core of upper half ring
Detection winding (W5), the lower U-shaped detection iron core outside of semi-ring is wound with the 6th exchange detection winding (W6)；
It is wound with the first modulation detection winding (W1), the second modulation detection winding (W2) and the 5th exchange detection winding (W5) first
Semi-ring detection iron core (C1) and the second semi-ring detection iron core (C2), it is placed in the cavity of the first semi-circular magnetic screen iron core；It is wound with
Three modulation detection winding (W3), the 4th modulation detection winding (W4) and the 6th exchange detection winding (W6) third semi-ring detection iron
Core (C3) and the 4th semi-ring detection iron core (C4), it is placed in the cavity of the second semi-circular magnetic screen iron core；First semi-circular magnetic screen
Iron core and the second semi-circular magnetic screen iron core form circular, and feedback winding is around in the first semi-circular magnetic screen iron core and the second half
On annular magnetic shielding iron core；
The first modulation detection winding (W1) different name end and the 4th modulation detection winding (W4) Same Name of Ends be connected, third tune
Detection winding (W processed3) Same Name of Ends and the second modulation detection winding (W2) different name end be connected；First modulation detection winding (W1)
Same Name of Ends be connected with the Same Name of Ends of modulation transformer (T) secondary winding, the second modulation detection winding (W2) Same Name of Ends connection
To the different name end of modulation transformer (T) secondary winding, the 4th modulation detection winding (W4) different name end and third modulation detection around
Group (W3) different name end simultaneously be connected with earth point；The related bandpass filter of centre cap of modulation transformer (T) secondary winding
Input terminal, the output terminal of bandpass filter (E) are connected to the input terminal of phase-sensitive demodulator (F), the output terminal of phase-sensitive demodulator (F)
It is connected with the input terminal of dc amplifier (G), the input terminal of the output terminal connection power amplifier (H) of dc amplifier (G), work(
The output terminal of rate amplifier (H) is connected with the Same Name of Ends of feedback winding, and the different name end of feedback winding passes through measuring resistance (Rs) even
Connect earth point；5th exchange detection winding (W5) Same Name of Ends be connected with earth point, the 5th exchange detection winding (W5) different name end
It is connected to the 6th exchange detection winding (W6) Same Name of Ends, the 6th exchange detection winding (W6) different name end be connected to ac filter
The input terminal of amplifier (K), the output terminal of waves AC filter amplifier (K) are connected to coupling capacitor (C0) one end, coupling electricity
Container (C0) the other end be connected to the Same Name of Ends of feedback winding.
2. clamp measuring device as described in claim 1, which is characterized in that the feedback winding is divided into two sections, and one section
It is even to be wound on outside the first semi-circular magnetic screen iron core, another section uniformly around outside the second semi-circular magnetic screen iron core, two sections etc.
The feedback winding divided is connected by conducting wire.
3. clamp measuring device as claimed in claim 1 or 2, which is characterized in that the upper half ring is U-shaped to detect iron core and lower half
The U-shaped detection iron core of ring, with permalloy tape be wound into it is U-shaped after by making annealing treatment.
4. clamp measuring device as claimed in claim 1 or 2, which is characterized in that the first semi-circular magnetic screen iron core and
Second semi-circular magnetic screen iron core is made of the cold-reduced silicon sheet that semi-annular shape is wound into after annealed processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810218244.5A CN108226610B (en) | 2018-03-16 | 2018-03-16 | Clamp type measuring device for alternating current and direct current small current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810218244.5A CN108226610B (en) | 2018-03-16 | 2018-03-16 | Clamp type measuring device for alternating current and direct current small current |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108226610A true CN108226610A (en) | 2018-06-29 |
| CN108226610B CN108226610B (en) | 2023-12-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810218244.5A Active CN108226610B (en) | 2018-03-16 | 2018-03-16 | Clamp type measuring device for alternating current and direct current small current |
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| Country | Link |
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| CN (1) | CN108226610B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109870664A (en) * | 2019-03-28 | 2019-06-11 | 北京大学 | A kind of magnetic field measurement system and measurement method |
| EP4296694A1 (en) * | 2022-06-23 | 2023-12-27 | Chauvin Arnoux | Measuring clamp for ac and dc leakage currents |
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| CN105353193A (en) * | 2015-11-27 | 2016-02-24 | 华中科技大学 | Low direct current clamp-shaped measuring device |
| CN208140774U (en) * | 2018-03-16 | 2018-11-23 | 华中科技大学 | A kind of clamp measuring device for alternating current-direct current low current |
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| SU1252733A1 (en) * | 1984-01-13 | 1986-08-23 | Предприятие П/Я В-8799 | Device for contactless measuring of interference currents |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109870664A (en) * | 2019-03-28 | 2019-06-11 | 北京大学 | A kind of magnetic field measurement system and measurement method |
| EP4296694A1 (en) * | 2022-06-23 | 2023-12-27 | Chauvin Arnoux | Measuring clamp for ac and dc leakage currents |
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| Publication number | Publication date |
|---|---|
| CN108226610B (en) | 2023-12-26 |
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