CN204116443U - Square electric current is bored a hole the AC current transducer of anti-strong electromagnetic - Google Patents
Square electric current is bored a hole the AC current transducer of anti-strong electromagnetic Download PDFInfo
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- CN204116443U CN204116443U CN201420501692.3U CN201420501692U CN204116443U CN 204116443 U CN204116443 U CN 204116443U CN 201420501692 U CN201420501692 U CN 201420501692U CN 204116443 U CN204116443 U CN 204116443U
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Abstract
The utility model belongs to alternating current testing product field, particularly relates to a kind of square electric current and to bore a hole the AC current transducer of anti-strong electromagnetic; Transmitter body adopts core-theaded type structure; Tested current copper bar from the perforation of transmitter body by and be fixed to one another and connect; Described transmitter body comprises toroidal core and the coiling magnetic test coil on it; Described toroidal core to be placed in engineering plastics housing and to carry out embedding; Signal processing module is provided with in transmitter body; The signal transmission port of described transmitter body is drawn via cable conductor or terminal.The utility model is applicable to being installed on square conducting copper, and anti-electromagnetic interference capability is strong, and accuracy of detection is high, and response frequency is fast.
Description
Technical field
The utility model belongs to alternating current testing product field, particularly relates to a kind of square electric current and to bore a hole the AC current transducer of anti-strong electromagnetic.This AC current transducer is applied to the industrial circles such as resource equipment, electric power facility, automated system, detects the alternating current of the equipment be in strong electromagnetic interference environment or system.
Background technology
Along with improving constantly of industrial automation level, particularly along with the sustainable development of intelligent grid and Internet of Things, in the implementation procedure of the communication technology, measurement technology, equipment and technology, control technology, all must adopt various voltage, current transducer, for monitoring in real time the working condition of equipment, guarantee that safe, efficient, the energy saving standard of equipment run.
AC current transducer be combination current mutual inductor and current transducer in the product of one, be the critical elements of electric power monitoring system, its effect converts alternating current to DC voltage or DC current.Simultaneously; it also bears strong power system and weak electricity system (such as; computer system) buffer action; with protection calculation machine acquisition system input not puncture by the alternating voltage of high pressure; tested major loop alternating current directly can be converted to the DC 4 ~ 20mA(of linearly ratio output by 250 Ω resistance conversion DC 1 ~ 5V or by 500 Ω resistance conversion DC 2 ~ 10V by it) constant current ring standard signal, be delivered continuously to receiving trap (computing machine or Displaying Meter).Along with the continuous lifting of China's equipment manufacturing level, also all start to use various voltage, current transducer more and more in a lot of electrical equipment, monitor in real time for the working condition of equipment, guarantee device security, efficiently, run to energy-saving and environmental protection.
In these applications above-mentioned, to the technical requirement of electrical quantity sensor/transmitter product except the conventional performance index such as linear, stability, temperature characterisitic, requirements at the higher level are proposed to the performance of electromagnetic compatibility aspect.
Utility model content
The purpose of this utility model is to provide one and is applicable to being installed on square conducting copper, and anti-electromagnetic interference capability is strong, and accuracy of detection is high, and the fast square electric current of response frequency is bored a hole the AC current transducer of anti-strong electromagnetic.
For solving the problems of the technologies described above, the utility model realizes like this.
Square electric current is bored a hole the AC current transducer of anti-strong electromagnetic, and its transmitter body adopts core-theaded type structure; Tested current copper bar from the perforation of transmitter body by and be fixed to one another and connect; Described transmitter body comprises toroidal core and the coiling magnetic test coil on it; Described toroidal core to be placed in engineering plastics housing and to carry out embedding; Signal processing module is provided with in transmitter body; The signal transmission port of described transmitter body is drawn via cable conductor or terminal.
As a kind of preferred version, signal processing module described in the utility model comprises ac amplifier circuit, current rectifying and wave filtering circuit, V/I change-over circuit, EMC protection circuit and voltage-stabilized power supply circuit.
Further, toroidal core described in the utility model adopts square ring structure.
Further, magnetic test coil outside described in the utility model is provided with protective layer.
Further, toroidal core described in the utility model adopts 0.2mm siliconized plate.
Further, magnetic test coil described in the utility model adopts diameter to be the enameled wire of 0.15mm ~ 0.47mm; The coiling number of turn is at 1000 ~ 5000 circles.
Further, in signal processing module described in the utility model, operation amplifier part adopts HB241 processing module.
It is strong that the utility model has anti-electromagnetic interference capability, the features such as accuracy of detection is high, and response frequency is fast.The utility model, by choosing suitable magnetic circuit material, appropriate coil design, thick film integrated circuit and anti-electromagnetic interference circuit, achieves the high precision test to the alternating current under strong electromagnetic interference environment.Transmitter can the duty of real-time monitoring system in equipment runs, and feeds back, monitored, to reach the generation effectively avoiding accident, guarantee the object of equipment security of operation by relevant protection system to equipment the loading condition of equipment.
Anti-interference AC current transducer is based under strong electromagnetic alternation interference environment, and the larger alternating current in AC equipment system detects and the needs of data acquisition and the one square core-theaded type current measurement product that designs.This product adopts electromagnetic isolation principle design, by signaling module process realization to the amplification of transmitter output signal and conversion.The combination property of transmitter obtains obvious lifting.The nonlinearity erron of transmitter and temperature drift are very little, and antijamming capability is comparatively strong, good operating stability.By the employing of rational structural design and special signal processing module, the combination property of transmitter is greatly improved.
This transmitter is mainly used in detecting the AC great current of AC power supply device or system; measurement range is between 10A to 800A; the aspect such as intelligent grid monitoring, operation power protective device, resource equipment can be widely used in; Real-Time Monitoring is carried out to the working current of equipment or system; by relevant protection system, equipment is protected; to avoid the generation of accident, guarantee device security and personal safety.
The utility model product be mainly used for intelligent grid build in the electric parameters transducer of particular/special requirement on various electrical equipment, also can meet simultaneously various frequency conversion occasion, mining machinery etc. compared with in strong electromagnetic interference environment for the particular/special requirement of electric parameters transducer product and the Internet of Things field particular/special requirement for electric parameters transducer.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.Protection domain of the present utility model is not only confined to the statement of following content.
Fig. 1 is principle of work block diagram of the present utility model.
Fig. 2 is circuit diagram of the present utility model.
Embodiment
As shown in the figure, square electric current is bored a hole the AC current transducer of anti-strong electromagnetic, and its transmitter body adopts core-theaded type structure; Tested current copper bar from the perforation of transmitter body by and be fixed to one another and connect; Described transmitter body comprises toroidal core and the coiling magnetic test coil on it; Described toroidal core to be placed in engineering plastics housing and to carry out embedding; Signal processing module is provided with in transmitter body; The signal transmission port of described transmitter body is drawn via cable conductor or terminal.
Signal processing module described in the utility model comprise ac amplifier circuit, current rectifying and wave filtering circuit,
v/Ichange-over circuit,
eMCprotection circuit and voltage-stabilized power supply circuit.
Toroidal core described in the utility model adopts square ring structure.Magnetic test coil outside described in the utility model is provided with protective layer.Toroidal core described in the utility model adopts 0.2mm siliconized plate.Magnetic test coil described in the utility model adopts diameter to be the enameled wire of 0.15mm ~ 0.47mm; The coiling number of turn is at 1000 ~ 5000 circles.In signal processing module described in the utility model, operation amplifier part adopts HB241 processing module.
The key problem in technology point of electric parameters transducer used for intelligent electric network/transmitter product is the technical requirement that will meet electromagnetic compatibility aspect, product design also will meet the technical requirement of intelligent grid site of deployment, solve the anti-strong electromagnetic problem of product, improve the synthesized competitiveness of electric parameters transducer comprehensively.
The utility model is applicable to being installed on square conducting copper.It adopts electromagnetic isolation technology to carry out the design of product as alternating current sampling.In order to ensure stability and the consistance of product, employing be thick film circuit design signal processing module, adopt closed silicon sheet core, single secondary coil structure.
Toroidal core is placed in a wherein half lining of the annular plastics ring being divided into two bodies by the utility model, after fixing by silicon rubber, covers other half plastic hoop; The sampling coil of coiling one group of suitable number of turns on plastic hoop, the enameled wire diameter of coiling is 0.15mm ~ 0.47mm, and the coiling number of turn is at 1000 ~ 5000 circles, and the selection of wire diameter and the number of turn of coiling are determined by the size of tested electric current.Two lead-in wires drawn by the coil that coiling is good; Then it is fixed to twine with insulating tape or insulation silk; Finally the iron core of coil and wiring board are placed in shell of transducer and use epoxide-resin glue embedding by the coiling handled well.
Transducer signal processing module mainly comprises several parts such as ac amplifier circuit, current rectifying and wave filtering circuit, DC amplification circuit and V/I change-over circuit, main components comprise designed by low drifting operating amplifier signal processing module (operation amplifier part adopt HB241), power module of voltage regulation, protection device and resistance, electric capacity etc.
The technology of transmitter realizes.
(1) operational amplifier of employing low drifting, single supply work forms amplifying circuit and current rectifying and wave filtering circuit, ensures that transmitter possesses less temperature drift.
(2) modular design is adopted, the special signal processing module of thick film technology design, electric capacity in active filter circuit adopts the electric capacity of Low Drift Temperature coefficient, ensure that the filter effect of transmitter in whole warm area, namely ensure that the ripple control of transmitter is in certain level.
(3) add gas discharge diode and transient protective diode at power input, suppress the high voltage surge undesired signal be coupled by power supply, guard signal treatment circuit.
(4) to outputing signal the safeguard procedures that have employed LC combinational circuit and add transient protective diode, preventing undesired signal from damaging from the intrusion of signal end, ensure that the interference free performance of transmitter.
(5) iron core adopts the design of 0.2mm siliconized plate, and layer insulation also by thermal treatment, reduces eddy current loss, improves response frequency.
(6) transmitter adopts epoxy resin to carry out the process structure of overall embedding, improves shock resistance and the impact resistance of product.
N in Fig. 1
1for tested current lead, can be single turn or multiturn input, N
2for magnetic test coil, magnet ring is made up of the silicon steel material compared with high initial permeability and higher saturated magnetic permeability, and magnetic test coil is evenly wound on magnet ring.According to the theory of electromagnetic induction, when there being electric current to flow through in magnet ring, the changes of magnetic field in magnetic circuit can be caused, the magnetic field of change can make the magnetic test coil in magnetic field produce induction current, faradic size is determined by the number of turn of number of primary turns, primary current size and magnetic test coil, and computing formula is.
N
1i
1=N
2i
2, then: I
1=N
2i
2/ N
1.
I.e. transmitters sense coil N
2in current signal I
2with measured current I
1linear corresponding relation, just obtains tested current value by the electric current in measuring transducer magnetic test coil like this.
Because transmitter is for checking of great current, initial permeability and all higher material of saturated magnetic permeability therefore must be adopted as iron core, the sensitivity of transmitter should be ensured, ensure the measurement range of transmitter again.
In order to improve the anti-interference of product, at internal coat one deck conductive paint of plastic casing, prevent electrostatic interference, improve Electro Magnetic Compatibility.
The signal processing module of transmitter comprises several parts such as ac amplifier circuit, current rectifying and wave filtering circuit, DC amplification circuit and V/I change-over circuit, main components comprise designed by low drifting operating amplifier signal processing module (operation amplifier part adopt HB241), power module of voltage regulation, protection device and resistance, electric capacity etc.
As shown in Figure 2, voltage-stabilized power supply circuit includes power regulator module A
3, electric capacity C
1, C
2, C
3composition, the output voltage of power circuit is+18V, ensures that the circuit power in transmitter can keep stable when 24V external power changes.
EMC protection circuit comprises transient diode D
2, gas-discharge tube B
1, diode D
3, inductance L
1, L
2with electric capacity C
4.Above combination of devices is protected in the filtering of the electrical surge protection achieved when input power connects anti-protection, thunderbolt and disturbing pulse; ensure the pure of transmitter working power, prevent undesired signal by plant-grid connection transmitter thus cause the damage of chip in transmitter.
X
1the magnet ring of the coil that has been coiling, is used for collection signal, R
1, R
2, R
3, R
5, be the sample resistance of sensed current signal, by sample resistance, ac current signal is become ac voltage signal and inputs to transmitter dedicated processes module HB241, W
1be the potentiometer be serially connected in sample resistance, the Full-span output value of transmitter can be adjusted.
HB241 is signal processing module, inside include signal operation amplifying circuit, current rectifying and wave filtering circuit and
v/Ichange-over circuit.This chip has 6 pins, and the 1st pin connects power positive end, and the 2nd pin connects wherein one end of magnetic test coil, and an other termination power ground end of magnetic test coil, the 3rd pin is held with connecing power supply, and the 4th pin is by resistance R
6with potentiometer W
2connect power supply ground, W
2can adjust the zero offset of transmitter, the 5th pin is unsettled, and the 6th pin is the output of transmitter.
Inductance L
3, L
4with electric capacity C
5, transient diode D
4, diode D
3composition input protection circuit, prevents high reject signal from damaging inside chip, transient diode D by the output terminal of transmitter
4can ensure that the overload of the output valve of transmitter is not too large, and the amplitude of external interference signals can be limited.
When measuring alternating current, by the perforation of tested current lead through transmitter, the direction that penetrates of current lead is not limit.When curent change in tested current lead, the magnetic field in magnetic circuit can change, and then causes X
1electric current in magnetic test coil changes, the electric current of this change inputs to signal processing module after resistance sampling, become 4 ~ 20mA DC current signal of standard through signal processing module conversion, just obtained the size of tested current value like this by the output current of measuring transducer.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (7)
1. square electric current is bored a hole an AC current transducer for anti-strong electromagnetic, it is characterized in that, transmitter body adopts core-theaded type structure; Tested current copper bar from the perforation of transmitter body by and be fixed to one another and connect; Described transmitter body comprises toroidal core and the coiling magnetic test coil on it; Described toroidal core to be placed in engineering plastics housing and to carry out embedding; Signal processing module is provided with in transmitter body; The signal transmission port of described transmitter body is drawn via cable conductor or terminal.
2. square electric current according to claim 1 is bored a hole the AC current transducer of anti-strong electromagnetic, it is characterized in that: described signal processing module comprises ac amplifier circuit, current rectifying and wave filtering circuit, V/I change-over circuit, EMC protection circuit and voltage-stabilized power supply circuit.
3. square electric current according to claim 2 is bored a hole the AC current transducer of anti-strong electromagnetic, it is characterized in that: described toroidal core adopts square ring structure.
4. square electric current according to claim 3 is bored a hole the AC current transducer of anti-strong electromagnetic, it is characterized in that: described magnetic test coil outside is provided with protective layer.
5. square electric current according to claim 4 is bored a hole the AC current transducer of anti-strong electromagnetic, it is characterized in that: described toroidal core adopts 0.2mm siliconized plate.
6. square electric current according to claim 5 is bored a hole the AC current transducer of anti-strong electromagnetic, it is characterized in that: described magnetic test coil adopts diameter to be the enameled wire of 0.15mm ~ 0.47mm; The coiling number of turn is at 1000 ~ 5000 circles.
7. square electric current according to claim 6 is bored a hole the AC current transducer of anti-strong electromagnetic, it is characterized in that: in described signal processing module, operation amplifier part adopts HB241 processing module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420501692.3U CN204116443U (en) | 2014-09-02 | 2014-09-02 | Square electric current is bored a hole the AC current transducer of anti-strong electromagnetic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420501692.3U CN204116443U (en) | 2014-09-02 | 2014-09-02 | Square electric current is bored a hole the AC current transducer of anti-strong electromagnetic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204116443U true CN204116443U (en) | 2015-01-21 |
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ID=52333739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420501692.3U Active CN204116443U (en) | 2014-09-02 | 2014-09-02 | Square electric current is bored a hole the AC current transducer of anti-strong electromagnetic |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204116443U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868749A (en) * | 2015-01-30 | 2015-08-26 | 宁波南车时代传感技术有限公司 | Current transmitter |
-
2014
- 2014-09-02 CN CN201420501692.3U patent/CN204116443U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868749A (en) * | 2015-01-30 | 2015-08-26 | 宁波南车时代传感技术有限公司 | Current transmitter |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |