CN101477145B - AC great current sensor - Google Patents
AC great current sensor Download PDFInfo
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- CN101477145B CN101477145B CN2009100607460A CN200910060746A CN101477145B CN 101477145 B CN101477145 B CN 101477145B CN 2009100607460 A CN2009100607460 A CN 2009100607460A CN 200910060746 A CN200910060746 A CN 200910060746A CN 101477145 B CN101477145 B CN 101477145B
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Abstract
The invention discloses an alternating current high-current sensor, which comprises an annular sensor and an integral processing circuit, wherein the annular sensor is n layers of annular PCB boards, the cross section of the annular sensor is provided with f n/2 spiral coils, and the adjacent spiral coils are orderly and serially connected; the spiral coils consist of conducting wires on various layers and via holes among the layers, and are connected to a bottom layer through the conducting wires; and the spiral coils are equidistantly and evenly distributed along the circumferential direction of a circular ring, an innermost ring or an outermost ring is reversely printed with a circle of conducting wires along the spiral coils, the conducting wires jointly form two-end output with the spiral coils, and the output is connected to the integral processing circuit. The alternating current high-current sensor is sensitive to the measured current and the change of the measured current, ensures that the increase of the measured current can not saturate, has good linearity and convenient installation and use, and can also effectively eliminate the influence of adjacent current at the same time; and the alternating current high-current sensor can be singly used, or a plurality of alternating current high-current sensors are serially connected to use. The alternating current high-current sensor is suitable for the measurement of alternating current high current, and can simultaneously meet the requirement of the measurement and protection of an electric power system.
Description
Technical field
The invention belongs to sensor technical field, be specifically related to a kind of AC great current sensor, be specially adapted to the electric power system alternating current Super-Current Measurement.
Background technology
The electric system development in recent years is rapid, and its rated current capacity is increasing, and the overcurrent dash current also increases thereupon significantly.To the measurement of electric power system alternating current electric current, at present widely used is induction current transformer unshakable in one's determination.Induction current transformer adopts closed type unshakable in one's determination in specified and following current measurement; Open type unshakable in one's determination is then adopted in the monitoring of overcurrent dash current.Because the influence of exciting current, open type current transformer unshakable in one's determination can produce bigger ratio and angular difference; The ferromagnetic material that closed core type uses under heavy current impact is easily saturated, produces remanent magnetism behind the saturated magnetization, because the existence of remanent magnetism can produce hysteresis, has a strong impact on accuracy of measurement.Need use two different current transformers in the metering of routine during with overcurrent protection, volume is big, cost is high.With the increase of current capacity, the volume of induction current transformer unshakable in one's determination will further increase, cost is higher.
For avoiding saturated and assurance accuracy of measurement unshakable in one's determination under the big electric current,, can adopt aircored air core coil method for the measurement of alternating current.Air core coil has no saturated, the outstanding advantage of good linearity, the induction output of air core coil and the number of turn, area and the electric current of coil be varied to direct ratio, for power current, the number of turn of coil, area directly influence measurement result.Typical method has wire wound air core coil and PCB type air core coil now, and PCB type air core coil has veneer and many plate structures.The wire wound air core coil, the consistance of its number of turn and area is limited by processing technology; The high conformity of the PCB type air core coil number of turn and area is easy to produce in enormous quantities, but is subjected to many-sided restriction in the practical application of many plate structures PCB type air core coil, and is very inconvenient.Someone proposes single plate structure PCB type air core coil, but must spreading on the circuit board by certain regulation, the lead that is connected with tested electric current (sees document (1) Zhou Youqing, Deng .PCB type hollow coil current-sensing device, number of patent application 200610032482.4), its tested range of current is restricted greatly.
Summary of the invention
The object of the present invention is to provide a kind of AC great current sensor, this sensor is an annular PCB structure, and the high conformity of its number of turn and area is easy to produce in batches, tested electric current increases can be unsaturated, also has characteristics such as volume is little, easy to install simultaneously.
AC great current sensor provided by the invention is characterized in that: it comprises annular sensor and Integral Processing circuit, and the output terminal of annular sensor is connected with the input end of Integral Processing circuit; The annular sensor is made of n layer annular pcb board, has on the xsect of annular sensor
Individual spiral coil, n are the positive integer more than or equal to 2; Spiral coil is made up of the via hole between the lead on each layer and layer and the layer, and is connected in series successively by lead at the bottom;
Expression rounds n/2 downwards.
As improvement of the technical scheme, spiral coil evenly distributes along the circumferentially equidistant of annular sensor.
Further improvement as above-mentioned technology, spiral coil rounds from starting point and gets back to and the starting point adjacent, then the inner ring of spiral coil or outmost turns along spiral coil around opposite direction print a circle lead, become terminal point near getting back to starting point once more, terminal point and starting point are as the pair of output of annular sensor.
Technique effect of the present invention:
1) there is not iron core, good linearity, unsaturated, be particularly suitable for AC great current and measure;
2) adopt the multi-layer helical coil structures to improve sensitivity, can effectively reduce the volume of sensor;
3) spiral coil equidistantly evenly distributes and encloses wire-bonds with one of reverse printing, can effectively resist adjacent currents and external magnetic field and disturb;
4) a plurality of series connection are used and be can further improve sensitivity, measure less current.
5) cost is low, high conformity, and it is extremely convenient to install and use.
Description of drawings
Fig. 1 realizes figure for the integral body of AC great current sensor of the present invention.
Fig. 2 is the cross-sectional structure synoptic diagram of annular sensor 2 among the present invention.
Fig. 3 is the top level structure synoptic diagram of annular sensor 2 among the present invention.
Fig. 4 is the anti-interference synoptic diagram of AC great current sensor of the present invention.
Fig. 5 uses synoptic diagram for sensor series connection of the present invention.
Embodiment
The present invention is further detailed explanation below in conjunction with accompanying drawing and example.
AC great current sensor of the present invention comprises annular sensor 2 and Integral Processing circuit 3, the whole realization as Fig. 1, and the conductor 1 that is connected with measured current I p passes from circle ring center.
The present invention can adopt following preferred version to make it more effectively resist adjacent currents and external magnetic field is disturbed: as shown in Figure 3 and Figure 4, spiral coil is circumferentially equidistant in annular pcb board upper edge evenly to distribute.Spiral coil rounds from starting point and gets back to and the starting point adjacent, then the inner ring of spiral coil or outmost turns along spiral coil around opposite direction print a circle lead 6, become terminal point near getting back to starting point once more, terminal point and starting point are as the pair of output of annular sensor 2.
The number of turn of spiral coil and stacked number
Relevant with the sensor output voltage value of tested size of current and requirement.Should determine according to specific requirement during actual design, the general number of turn be tens of circles to hundreds of circles, stacked number be 1 to
Individual.Spiral coil is equidistant on the annular sensor 2 evenly distributes and be connected in series with a circle lead that inner ring or outmost turns are oppositely printed, can effectively resist the external magnetic field disturbing effect of adjacent currents 7 generations, as Fig. 4.
The course of work of the present invention is as follows:
When flowing through tested alternating current Ip on the conductor 1, annular sensor 2 internal inductions go out electromotive force V
0, V
0Size be proportional to the amplitude of the certain exchange current of frequency, V
0Phase place and measured current I p differ 90 degree, through Integral Processing circuit 3 couples of V
0Integral Processing can obtain amplitude size and the phase place of measured current I p.The allowed band that measured current I p changes can reach hundreds of kiloamperes from hundreds of amperes, and the spiral coil number of turn on the annular sensor 2 and the size of stacked number and tested electric current are inverse ratio.Specific implementation of the present invention as shown in Figure 1, the conductor 1 that is connected with measured current I p passes from annular sensor 2, the output of annular sensor 2 connects the input of Integral Processing circuit 3, and the output voltage of Integral Processing circuit 3 is directly proportional with measured current I p, and phase place is identical with measured current I p.
Improve the number of turn of spiral coil and the response sensitivity that stacked number can effectively improve 2 pairs of tested electric currents of annular sensor; The PCB manufacturing process can guarantee the uniformity of the number of turn and the symmetry of structure, therefore can improve the accuracy of measuring.
Said structure annular sensor 2 can singlely use; Under the situation of needs, also above-mentioned a plurality of veneers (annular sensor 2) can be joined end to end, series connection is used, as shown in Figure 5.
Example is as follows:
If the Ip ratings of tested electric current is 4kA, rated frequency is 50Hz, adopts the n=8 laminate, the stacked number of spiral coil is 4, and the spiral coil number of turn is 800 o'clock, and annular sensor 2 output voltages are 400mV, Integral Processing circuit 3 output voltages are 200m V, export the corresponding tested electric current 1A of 0.2m V this moment.
Fig. 4 is the anti-interference synoptic diagram of AC great current sensor of the present invention, 7 galvanizations of adjacent wires may produce induced potential in annular sensor 2 influence measurement result, because the annulus 6 of reverse formation is arranged among the present invention, it and spiral coil differential concatenation, the interference potential equal and opposite in direction that adjacent currents line 7 forms in spiral coil and reverse annulus, direction is opposite, cancels out each other, to not influence of measurement result.
Claims (2)
1. AC great current sensor, it is characterized in that: it comprises annular sensor (2) and Integral Processing circuit (3), the output terminal of annular sensor (2) is connected with the input end of Integral Processing circuit (3); Annular sensor (2) is made of n layer annular pcb board, has on the xsect of annular sensor (2)
Individual spiral coil, n are the positive integer more than or equal to 2; Spiral coil is made up of the via hole (5) between the lead on each layer (4) and layer and the layer, spiral coil rounds from starting point and gets back to and the starting point adjacent, then the inner ring of spiral coil or outmost turns along spiral coil around opposite direction print a circle lead (6), become terminal point near getting back to starting point once more, terminal point and starting point be as the pair of output of annular sensor (2), and be connected in series successively by lead at the bottom;
Expression rounds n/2 downwards.
2. AC great current sensor according to claim 1 is characterized in that: spiral coil evenly distributes along the circumferentially equidistant of annular sensor (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100607460A CN101477145B (en) | 2009-02-13 | 2009-02-13 | AC great current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100607460A CN101477145B (en) | 2009-02-13 | 2009-02-13 | AC great current sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101477145A CN101477145A (en) | 2009-07-08 |
| CN101477145B true CN101477145B (en) | 2010-12-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100607460A Expired - Fee Related CN101477145B (en) | 2009-02-13 | 2009-02-13 | AC great current sensor |
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| Country | Link |
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| CN (1) | CN101477145B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101775A (en) * | 2013-04-02 | 2014-10-15 | 优利德科技(中国)有限公司 | Current measuring circuit |
| EP2821797B1 (en) * | 2013-07-03 | 2020-11-04 | ABB Schweiz AG | Current sensing device, and method of manufacturing the same |
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2009
- 2009-02-13 CN CN2009100607460A patent/CN101477145B/en not_active Expired - Fee Related
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| CN101477145A (en) | 2009-07-08 |
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Granted publication date: 20101229 Termination date: 20140213 |