CN107589290A - A kind of recombination line ring type structure for direct current long pulse current measurement - Google Patents
A kind of recombination line ring type structure for direct current long pulse current measurement Download PDFInfo
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- CN107589290A CN107589290A CN201710755924.6A CN201710755924A CN107589290A CN 107589290 A CN107589290 A CN 107589290A CN 201710755924 A CN201710755924 A CN 201710755924A CN 107589290 A CN107589290 A CN 107589290A
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Abstract
The invention discloses a kind of recombination line ring type structure for direct current long pulse current measurement, include compound coil and subtraction circuit, described compound coil includes positive polarity coil and negative polarity coil, described positive polarity coil contains tap P+ and P, P+ are coil-end tap, and P is the tap of loop line end, described negative polarity coil contains tap N+ and N, N+ is coil-end tap, and N is the tap of loop line end, and described subtraction circuit includes four resistance R1, R2, R3, R4 and operational amplifier.The present invention is equipped with the structure of subtraction circuit using compound coil, for the application scenario being had a strong impact on by triggering noise, the differential signal amplitude for enabling to integrator to input doubles, triggering noise amplitude is significantly decayed, primary signal signal to noise ratio rises, it is easy to late-class circuit to use plus and blowup signal, the glitch noise in integral result can be eliminated, so as to finally improves measurement accuracy.
Description
Technical field
The present invention relates to the current measurement techniques field of big direct current long pulse, more particularly to one kind to be used for direct current long pulse electricity
The recombination line ring type structure of flow measurement.
Background technology
Rogowski coil is according to electromagnetic induction principle, by wire uniform winding on nonmagnetic annular skeleton, when coil knot
The timing of structure one, coil mutual inductance are definite value, and the magnetic linkage that coil is interlinked is directly proportional to the electric current through Rogowski coil qualified surface, coil
The induced electromotive force of both ends output is directly proportional to primary side current, and phase differs 90 degree, referred to as differential signal, passes through integrator pair
After the signal integration, you can obtain the relevant information of primary side current.
It is mainly used to test high current, powerful device, it is made up of four rectifier parallel connections, and separate unit steady-state current is
30KA, transient current 100KA, rectifier are Thyristor Controlled structure.When rectifier works, IGCT receives trigger signal
Conducting, because Luo Ke coils are arranged on DC master row, trigger signal can be coupled by the distribution capacity between coil and busbar
Into coil output signal, so as to form triggering noise.The noise amplitude is high, easily covers the useful letter of Luo Ke coils output
Number, so as to which plus and blowup signal can not be used, cause signal to noise ratio low.Such as untreated signal is integrated, integral result
Glitch noise is will appear from, and precision is low.
Chinese invention patent discloses the Rogowski coil and signal processing method of a kind of Double-wire parallel wound（Jin Shixin, Zhang Wuyang,
Lee's seed is good, etc., the Rogowski coil and signal processing method of a kind of Double-wire parallel wound, application number：201510875045.8 the applying date：
2015.12.02）.Involved by the patent of invention：" Rogowski coil of Double-wire parallel wound is adjacent, flat using two-way enamel-covered wire
Go and uniform winding is on Roche DC master row, form loop coil, and four taps of coil：A1, tap A2, tap B1,
Tap B2 is respectively the head and tail of loop A；Tap B1 and tap B2 is respectively coil B head and tail；The head of loop A and coil B
Tail connection it is as a reference point, i.e., tap A1 couples with tap B2；Obtained in the tail tap A2 and coil B of loop A head tap B1
Obtain two-way differential wave." more than this structure and tap connections, just correspond to, by former single turn coiling, become circle in pairs
Coiling, under same size DC master row, compared with single turn coiling, it substantial can not increase the coil winding number of turn, therefore believe
Number intensity substantial can not increase.The structure compares single-turn circular coil, just corresponds to provide a flat central point of electrical reference signal.
In addition, signal processing method involved in patent：" due to the wire to be insulated using two-way enamel-covered wire or other top layers and it is wound on
On traditional Roche DC master row, two-way differential wave is obtained, using preposition differential signal voltage amplifier to e (t) processing, through this
The detection of differential wave, sensitivity are doubled, also with feature resistant to common code interference." can have to a certain extent
Feature resistant to common code interference, still, for the differential mode noise of such as foregoing triggering noise etc, the structure and processing method can not
Meet application requirement.
In addition, Chinese invention patent discloses the digital integrator for direct current long pulse current measurement（Fu Peng,
Shake, Wang Linsen, Jiang Li, for the digital integrator of direct current long pulse current measurement, application number：CN201610410846.1,
The applying date：2016.06.03）, this patent is on the basis of patent applied for before, to the signal input part of primary circuit structure
Optimize, adapt it to the measurement under very noisy application environment.
The content of the invention
The defects of the object of the invention is exactly to make up prior art, there is provided a kind of for direct current long pulse current measurement
Recombination line ring type structure.
The present invention is achieved by the following technical solutions：
A kind of recombination line ring type structure for direct current long pulse current measurement, include compound coil and subtraction circuit, it is described
Compound coil include positive polarity coil and negative polarity coil, it is coil that described positive polarity coil, which contains tap P+ and P-, P+,
Tap is held, P- is the tap of loop line end, and it is coil-end tap that described negative polarity coil, which contains tap N+ and N-, N+, and N- is loop line
Tap is held, described subtraction circuit includes four resistance R1, R2, R3, R4 and operational amplifier, and resistance R1 and resistance R2 goes here and there
Connection, resistance R3 connect with resistance R4, the backward end of resistance R1 and resistance R2 connection end concatenation operation amplifier, resistance R3 and electricity
Hinder the end in the same direction of R4 connection end concatenation operation amplifier, the output end of resistance R2 other end concatenation operation amplifier, resistance
The R4 other end is connected with reference ground, and described positive polarity coil tap P+ is connected with the resistance R3 other end, tap P- and ginseng
It is connected with examining, negative polarity coil tap N+ is connected with the resistance R1 other end, and tap N- is connected with reference ground.
Described compound coil has two kinds of structures, and one kind is split-type structural compound coil, and one kind is answered for nesting type structure
Zygonema circle；Described split-type structural compound coil is by two coils with identical parameters, is enclosed in the opposite direction to be measured
On DC master row, two coils are brought into close contact close；Described nesting type structure compound coil be by with identical parameters just
Negative polarity coil is wrapped on DC master row, and negative polarity coil is nested in positive polarity coil inner chamber, and positive polarity coil is wrapped in negative
Outside polarity coil, closely press close between positive-negative polarity coil, isolated between positive-negative polarity coil with thin insualting material, positive-negative polarity
The position interchangeable of coil.
Described identical parameters refer to that the number of turn, size, material and structure are identical.
It is an advantage of the invention that：The present invention is equipped with the structure of subtraction circuit using compound coil, for tight by triggering noise
The application scenario that ghost image rings, the differential signal amplitude for enabling to integrator to input double, and triggering noise amplitude is by significantly
Degree decay, primary signal signal to noise ratio rise, are easy to late-class circuit to use plus and blowup signal, can eliminate in integral result
Glitch noise, so as to finally improve measurement accuracy.
Brief description of the drawings
Fig. 1 is structured flowchart of the present invention.
Fig. 2 is fundamental diagram of the present invention.
Fig. 3 is split-type structural compound coil（Fig. 3 a are split-type structural installation diagram, and Fig. 3 b are split-type structural coil knot
Composition）.
Fig. 4 is nesting type structure compound coil（Fig. 4 a are nesting type structure installation diagram, and Fig. 4 b are nesting type structure coil knot
Composition）.
Embodiment
As shown in Figure 1, 2, a kind of recombination line ring type structure for direct current long pulse current measurement, includes compound coil
1 and subtraction circuit 2, described compound coil 1 include positive polarity coil 3 and negative polarity coil 4, described positive polarity coil 3 contains
It is coil-end tap to have tap P+ and P-, P+, and P- is the tap of loop line end, and described negative polarity coil 4 contains tap N+ and N-, N+
For coil-end tap, N- is the tap of loop line end, and described subtraction circuit 2 includes four resistance R1, R2, R3, R4 and computing is put
Big device 5, resistance R1 are connected with resistance R2, and resistance R3 is connected with resistance R4, and resistance R1 and resistance R2 connection end concatenation operation is put
The backward end of big device 5, the end in the same direction of resistance R3 and resistance R4 connection end concatenation operation amplifier 5, the resistance R2 other end connect
The output end of operational amplifier 5 is connect, the resistance R4 other end is connected with reference ground, described positive polarity coil tap P+ and resistance
The R3 other end is connected, and tap P- is connected with reference ground, and negative polarity coil tap N+ is connected with the resistance R1 other end, tap N-
It is connected with reference ground.
Described compound coil 1 has two kinds of structures, and one kind is split-type structural compound coil, and one kind is answered for nesting type structure
Zygonema circle；Described split-type structural compound coil is by two coils with identical parameters, is enclosed in the opposite direction to be measured
On DC master row 6, two coils are brought into close contact close；Described nesting type structure compound coil be by with identical parameters just
Negative polarity coil is wrapped on DC master row 6, and negative polarity coil 4 is nested in the inner chamber of positive polarity coil 3, and positive polarity coil 3 wraps up
Outside negative polarity coil 4, closely press close between positive-negative polarity coil, isolated between positive-negative polarity coil with thin insualting material, just
The position interchangeable of negative polarity coil.
Operational amplifier 5 selects Low Drift Temperature, and low bias voltage, Low-bias Current device, resistance is from high accuracy（Such as
1‰）, Low Drift Temperature device（Such as 10ppm and following）.
With identical parameters（Such as number of turn, size, material）Positive-negative polarity coil composition compound coil be arranged on treat
Survey on DC master row.For electric current to be measured, positive polarity coil exports the differential signal+Sig of same polarity, negative polarity coil
Export the differential signal-Sig of opposite to that polarity.For triggering noise, because triggering noise is coupled to line by distribution capacity
Ring signal output end, therefore for positive-negative polarity coil, the triggering noise that both couple has identical polar, and noise is respectively NTP
With NTN.Because positive-negative polarity coil parameter is equal or close, therefore both differential signal amplitudes of output are close, and trigger noise
Amplitude is also close.The signal of positive polarity coil output is+Sig+NTP, the signal of negative polarity coil output is-Sig+NTN.Will
Two signals are input to after subtraction circuit subtracts each other, and obtain signal 2Sig+NT, differential signal amplitude, which increases, to be twice, because coil is joined
Number is not fully equal, therefore the noise N of certain amplitude is still suffered from after subtracting each otherT, compared to using before this method, triggering noise is
Through significantly decaying.
Referring to Fig. 3 and Fig. 4, for the compound coil of positive-negative polarity coil composition, there are two kinds of structure types, one kind is Fig. 3
Shown split-type structural, another kind are the nesting type structure shown in Fig. 4.Fig. 3 a are split-type structural installation diagram, and Fig. 3 b are point
Body formula structure coil structure chart, in split-type structural installation diagram, positive polarity coil is arranged on DC master row with negative polarity coil
On, two coils are brought into close contact close, CdDistribution capacity between coil and busbar, the output tap of two coils is according to even
Relation is connect, is connected with subtraction circuit, the signal after subtraction circuit is handled, is output in integrator, integrator is completed to integrate
Journey.In coil structure, D is the wire diameter of coiling, and R is the radius of the coil turned to, and the related of coiling is joined
Number（Such as the number of turn, size, material etc.）Determined according to being actually needed, coil lumen centers position is Luo Ke coil loop lines, loop line
Position also can be arranged in coil other correct positions based on the actual application requirements.In split-type structural installation diagram, positive-negative polarity line
Circle is this structure, and relevant parameter is identical or close.In Fig. 4, Fig. 4 a are nesting type structure installation diagram, and Fig. 4 b are nested type knot
Structure coil structure, it is in appearance single coil, actually positive-negative polarity coil is integrated in together in nesting type structure installation diagram
On one skeleton, CdDistribution capacity between coil and busbar, the output tap of two coils is according to annexation, with subtraction electricity
Road connects, and the signal after subtraction circuit is handled, is output in integrator, and integrator completes integral process.In coil structure,
Positive polarity coil is wrapped in negative polarity coil outer（Both positions, which are exchanged, also may be used）, between coil with thin insualting material carry out every
From G1 is gap between the two, and the loop line of two coils is located at coil lumen centers position, and spacing G2, loop line position is also
Coil other correct positions can be arranged in based on the actual application requirements.D1, D2 are respectively the wire of coiling positive-negative polarity coil
Footpath, R1, R2 are respectively the radius of positive-negative polarity coil.In order to ensure that the triggering noise of positive-negative polarity coil coupling is consistent, no
Only both materials of regulation are identical with the number of turn, and regulation R1 and R2 is close, and D1 is identical with D2, and G1 and G2 is as small as possible, so as to
Ensure the uniformity on two coil parameters.
Although above in conjunction with accompanying drawing, invention has been described, and the invention is not limited in above-mentioned specific implementation
Mode, above-mentioned embodiment is only schematical, rather than restricted, and those skilled in the art is in the present invention
Enlightenment under, in the case of present inventive concept and scope of the claimed protection is not departed from, many forms can also be made, this
It is a little to belong within the protection of the present invention.
Claims (3)
- A kind of 1. recombination line ring type structure for direct current long pulse current measurement, it is characterised in that：Include compound coil and Subtraction circuit, described compound coil include positive polarity coil and negative polarity coil, and described positive polarity coil contains tap P+ With P-, P+ is coil-end tap, and P- is the tap of loop line end, and it is coil-end that described negative polarity coil, which contains tap N+ and N-, N+, Tap, N- are the tap of loop line end, and described subtraction circuit includes four resistance R1, R2, R3, R4 and operational amplifier, resistance R1 connects with resistance R2, and resistance R3 connects with resistance R4, resistance R1 and resistance R2 connection end concatenation operation amplifier it is reverse End, the end in the same direction of resistance R3 and resistance R4 connection end concatenation operation amplifier, resistance R2 other end concatenation operation amplifier Output end, the resistance R4 other end is connected with reference ground, described positive polarity coil tap P+ and resistance R3 other end phase Even, tap P- is connected with reference ground, and negative polarity coil tap N+ is connected with the resistance R1 other end, tap N- and reference ground phase Even.
- 2. a kind of recombination line ring type structure for direct current long pulse current measurement according to claim 1, its feature exist In：Described compound coil has two kinds of structures, and one kind is split-type structural compound coil, and one kind is nesting type structure recombination line Circle；Described split-type structural compound coil is by two coils with identical parameters, is enclosed on direct current to be measured in the opposite direction On busbar, two coils are brought into close contact close；Described nesting type structure compound coil is by the both positive and negative polarity with identical parameters Property coil is wrapped on DC master row, and negative polarity coil is nested in positive polarity coil inner chamber, and positive polarity coil is wrapped in negative polarity Outside coil, closely press close between positive-negative polarity coil, isolated between positive-negative polarity coil with thin insualting material, positive-negative polarity coil Position interchangeable.
- 3. a kind of recombination line ring type structure for direct current long pulse current measurement according to claim 2, its feature exist In：Described identical parameters refer to that the number of turn, size, material and structure are identical.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201749142U (en) * | 2010-06-23 | 2011-02-16 | 浙江永泰隆电子有限公司 | Double-coil current sensor |
| CN103364615A (en) * | 2013-07-17 | 2013-10-23 | 上海思盛电力控制技术有限公司 | Arrester leakage current monitor isolation sampling circuit |
| CN107037251A (en) * | 2015-11-23 | 2017-08-11 | 施耐德电器工业公司 | Current sensor and the device for measuring electric current |
-
2017
- 2017-08-29 CN CN201710755924.6A patent/CN107589290A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201749142U (en) * | 2010-06-23 | 2011-02-16 | 浙江永泰隆电子有限公司 | Double-coil current sensor |
| CN103364615A (en) * | 2013-07-17 | 2013-10-23 | 上海思盛电力控制技术有限公司 | Arrester leakage current monitor isolation sampling circuit |
| CN107037251A (en) * | 2015-11-23 | 2017-08-11 | 施耐德电器工业公司 | Current sensor and the device for measuring electric current |
Non-Patent Citations (2)
| Title |
|---|
| 刘国巍 等: "《模拟电子技术基础》", 1 June 2008, 《国防科技大学出版社》 * |
| 陶桓齐 等: "《模拟电子技术》", 28 February 2013, 《华中科技大学出版社》 * |
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