CN103217565A - Current sensor and implementing method thereof based on alloy resistor - Google Patents
Current sensor and implementing method thereof based on alloy resistor Download PDFInfo
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- CN103217565A CN103217565A CN2013101035624A CN201310103562A CN103217565A CN 103217565 A CN103217565 A CN 103217565A CN 2013101035624 A CN2013101035624 A CN 2013101035624A CN 201310103562 A CN201310103562 A CN 201310103562A CN 103217565 A CN103217565 A CN 103217565A
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Abstract
The invention discloses a current sensor based on an alloy resistor and an implementing method thereof. The current sensor comprises the alloy resistor, a voltage measuring unit, a power supply unit, a controller and a communication unit, wherein the alloy resistor is serially connected with a to-be-measured circuit, the voltage measuring unit is used for measuring the voltage at the two ends of the alloy resistor and sending the voltage value to the controller, the controller is used for calculating the current value of the measured circuit and outputting according to the resistance value of the alloy resistor, the power supply unit is used for supplying power for the voltage measuring unit, the controller and the communication unit, and the communication unit is used for the remote outputting of the controller. When the controller sends measured data to a far end or a background, the measured data is transmitted through the communication unit. Compared with an existing current transformer, the current sensor has the advantages that the temperature drift is avoided, the mechanical vibration-resistant performance is realized, the frequency characteristic is good, the alternating current and the direct current are universal, the size is small, the assembly is realized, and the like.
Description
Technical field
The invention belongs to Automation of Electric Systems information acquisition and control field, be specifically related to a kind of implementation method of the current sensor based on resistance alloys.
Background technology
At present, intelligent grid has become the great research topic in global energy development and the change.The basic thought of intelligent grid is to utilize advanced digital information network that generating, transmission of electricity, power transformation, distribution and electricity consumption service and accumulation of energy and energy terminal user's various electrical equipments and other are linked together with the energy facility, by the management of intellectuality control realization to electric energy, by accurate energy supply, corresponding energy supply, the modes such as energy supply and complementary energy supply of helping each other, reach the raising level of resources utilization, improve the target of power supply quality and reliability.
Sensor and measuring technique are the bases of realizing intelligent grid monitoring, control, analysis and decision, also are the keys of intelligent grid development.Have only and adopt advanced sensing technology, build flourishing sensor network, cooperate flourishing communication system and emulation technology again, could realize whole electrical network intellectuality.
In traditional electric system observing and controlling and resist technology field, because electrical network and power equipment have a high voltage heavy current, and secondary devices such as protection or observing and controlling belong to the light current electronic equipment, therefore have natural wide gap between the two.Therefore, traditional technology in electric system once and set up barrier between the electrical secondary system is broken both electrical links, utilizes electromagnetism or the optical transition tie as both sides' contact.Although current transformer has entered into the digitizing stage from initial analogue technique, also obtained major progress at aspects such as device miniaturization.But, basic change does not take place in its essence, electromagnetism or optical transition principle complexity, linearization is not ideal enough and unstable, once and the estrangement between the electrical secondary system still, electrical specifications such as frequency response, dynamic perfromance and alternating current-direct current still constitute potential threat to aspects such as the reliability of the current measurement by electromagnetic conversion or optical transition and versatilities.
Summary of the invention
At the deficiencies in the prior art, the present invention broken current sense measure in primary system and the wide gap that electrical secondary system is electrically connected, no longer by means of methods such as electromagnetic conversion or optical transition, utilize pure circuit theory to realize the perception measurement of power system voltage.The present invention proposes a kind of current sensor and its implementation based on resistance alloys, utilize the core parts of resistance alloys as voltage sensor, realization electric system heavy current installation is electric related with weak current equipment, simplify the measuring principle of voltage, improve its adaptability, and improve the precision reduced volume for power system frequency, dynamic dispatching characteristic.
A kind of current sensor provided by the invention based on resistance alloys, its improvements are that described current sensor comprises resistance alloys, voltage measurement unit, power supply unit and controller;
Described resistance alloys seals in circuit-under-test; Described voltage measurement unit is measured the voltage at described resistance alloys two ends and is passed to described controller; Described controller calculates the current value and the output of circuit-under-test according to described resistance alloys resistance;
Described power supply unit is described voltage measurement unit and the power supply of described controller.
Wherein, described voltage measurement unit is connected in parallel on described resistance alloys two ends, and is connected with described controller;
Described power supply unit is connected with described controller with described voltage measurement unit respectively.
Wherein, described current sensor comprises communication unit, is used for the long-range output of described controller; When described controller when far-end or backstage provide measurement data, transmit by described communication unit; Described power supply unit is given described communication unit power supply.
Wherein, the resistance of described resistance alloys is less than 0.001 ohm.
Wherein, described voltage measurement unit comprises the secondary electron loop;
Described secondary electron loop comprises voltage induced device, analog to digital converter and DSP microprocessor;
Described DSP microprocessor is controlled the voltage that described voltage induced measurement device goes out described resistance alloys, passes to analog to digital converter and converts digital signal output to.
The present invention is based on the implementation method of a kind of current sensor that another purpose provides, its improvements are, resistance alloys is sealed in circuit-under-test, described voltage measurement unit is measured the voltage at described resistance alloys two ends and is passed to described controller, and described controller calculates the current value and the output of circuit-under-test according to described resistance alloys resistance; Wherein, described power supply unit is described voltage measurement unit and the power supply of described controller.
Wherein, when described controller when far-end or backstage provide measurement data, described controller transmits by communication unit.
Wherein, described power supply unit provides direct current 24V voltage for the communication unit of described voltage measurement unit, described controller.
Compared with the prior art, beneficial effect of the present invention is:
Current sensor of the present invention once part partly has directly with secondary and to be electrically connected, there are not any electromagnetism or optical transition process, have simple electric related based on Circuit theory between measured value and the tested electric current of output, principle is simple, linear good, do not have that temperature is floated, problem such as anti-mechanical vibration ability difference and volume are excessive, improve its adaptability simultaneously, and improve the precision reduced volume for power system frequency, dynamic dispatching characteristic.
Current sensor measurement gained current value of the present invention carries out digitizing output, is easy to handle with the interface of processor, and the numerical information of transmission can be transmitted by Ethernet UDP/IP communications protocol, conveniently installs, runs and safeguard.
Current sensor principle of the present invention and simple in structure, has structural group combination feature, utilize electronic type micropower, miniaturization advantage, data collector can be combined in the combined electrical apparatuses such as transformer, GIS, HGIS, isolating switch, isolation knife by modularity, reduce and take up an area of, reduce cost, can also promote the miniaturization and the intellectuality of an electrical equipment itself by multiplexing functions.
The present invention compares with Hall effect sensor elements, and no saturated, temperature floats that little, anti-mechanical oscillation ability is strong, insulation is simple, volume is little.The gamut linearity is good, precision is high.Compare with novel optical fibre current sensor, it is simple in structure, has eliminated that optics mutual inductor environmental suitability is poor, temperature is floated greatly, the shortcoming of poor anti jamming capability, and large-scale promotion preferably is used.
The resistance of resistance alloys of the present invention has guaranteed the security and the accuracy of device less than 0.001 ohm.
Description of drawings
Fig. 1 is the schematic diagram of current sensor provided by the invention.
Fig. 2 is the circuit diagram of current sensor provided by the invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
A kind of current sensor based on resistance alloys that present embodiment proposes comprises resistance alloys, power supply unit, voltage measurement unit, controller and communication unit; Its principle schematic as shown in Figure 1, among the figure W1, W2 directly be connected by Acquisition Circuit, W3, W4 are sense line, X is based on the measurement mechanism of resistance alloys, Y is peripheral amplifying circuit.
This sensor is directly connected high-precision resistance alloys and is inserted tested high voltage heavy current circuit.Described resistance alloys has enough little and ohmic value stable accuracy, and tested heavy current flows through the voltage drop that resistor disc produces and drops within the measurement range of light current measuring equipment.Described resistance alloys is accurately measured this voltage landing by the direct input as voltage measurement unit of voltage landing that tested heavy current produces.The radiometer of the ohmic value by this voltage and known resistance alloys sheet is calculated tested current value.
Concrete, as shown in Figure 2, the circuit diagram of the current sensor that provides for present embodiment.Current sensor comprises resistance alloys, power supply unit, voltage measurement unit, controller and communication unit; Resistance alloys seals in circuit-under-test; Voltage measurement unit is measured the voltage at resistance alloys two ends and is passed to controller (shown in dotted line); Controller calculates the current value and the output of circuit-under-test according to the resistance alloys resistance; Power supply unit is voltage measurement unit, controller and communication unit power supply.
Its circuit is connected to: resistance alloys seals in circuit-under-test; Voltage measurement unit is connected in parallel on the resistance alloys two ends, and is connected with controller; Controller is connected with communication unit; Power supply unit is connected with voltage measurement unit, controller and communication unit respectively.
Present embodiment adopts microcontroller to realize the function of controller.It is the data processing of this sensor and the core cell of calculating, can handle computing to the voltage measurements of input according to setting program.The characteristic information of the resistance alloys that is connected in series comprises its ohmic value, is preset in advance in the microcontroller storage unit by interactive interface.Microcontroller can calculate according to measuring voltage value and resistance alloys value according to plug-in in advance and obtain the current value of surveying after obtaining the measuring voltage value.In addition, the demand according to this device application scenarios and environment as measured data there being other further processing demands, can realize flexibly by the setting to handling procedure, makes this device have intelligent characteristic.
As the assembly of this sensor, result can be exported (as serial ports) by microcontroller by this locality, with miscellaneous equipment processing unit interface and driving as intelligent electric appliances such as transformer, GIS, HGIS, isolating switch, isolation knife.
This sensor need provide measurement data to far-end or backstage etc., and then microcontroller is exported to special-purpose communication unit with result.Special-purpose communication unit is according to the requirement of local communication passage and agreement, and for example Ethernet UDP/IP communications protocol is handled the back with measurement data and transmitted to the backstage far-end.
This enforcement resistance alloys selects to have enough little and ohmic value (less than 0.001 ohm) stable accuracy, and heavy current flows through the voltage drop that resistance alloys produces and drops within the measurement range of light current measuring equipment.Resistance alloys can adopt nickel-chrome, cupronickel etc.
The voltage measurement unit of present embodiment comprises the secondary electron loop; Described secondary electron loop comprises voltage induced device, analog to digital converter and DSP microprocessor; Described DSP microprocessor is controlled the voltage that described voltage induced measurement device goes out described resistance alloys, passes to analog to digital converter and converts digital signal output to.
The power supply unit of present embodiment takes to be fit to the technology of rig-site utilization environment, provides direct current 24V driving electric to voltage measurement unit, microcontroller and communication unit.
This patent is based on the New type of current sensor data acquisition device of novel capturing material (resistance alloys) design; the beginning in domestic power system measuring field will be started; can realize and protect the direct light current interface of opertaing device; and has good measurement performance, with conventional current mutual inductor performance comparison such as following table 1.
Table 1: novel intelligent type electronic type data collector and conventional current mutual inductor performance comparison
| Performance | The conventional current mutual inductor | Intelligent electric minor current sensor data collector |
| Signal | 5A | 100mA |
| Secondary load | 1-50VA | 〉=4 smooth Europe |
| Accuracy | Measure: 0.2%-1% protection: 5%-10% | Multi-usage, error is less than 1% |
| Dynamic range | 40xI n | Unrestrictedly |
| Linear | Non-linear | Linearity height |
| Saturated | The output signal distortion | Do not have |
| Temperature coefficient | There is not influence | Compensated |
| That opens a way is secondary | Destructive | There is not injury |
| Information is transmitted | Analog quantity is transmitted | Numerical information is transmitted by the UDP/IP communications protocol |
| The lifetime cost | High | Low |
| With Microprocessor Interface | Need high/low conversion, interface processing cost height | Can directly use by dividing potential drop, interface is handled simple |
By above-mentioned comparative analysis, the novel intelligent type electronic type data collector of present embodiment the aspect such as floats in accuracy, dynamic range, linearity, antisaturation, temperature and is better than the conventional current mutual inductor, and that this new transformer has is highly sensitive, purposes wide, stable performance, be easy to use and characteristics such as with low cost.
Current sensor of the present invention utilizes resistance alloys as the core perception device, both can be used for the measurement of the big electric current of alternating circuit power frequency and high frequency (MHz magnitude), also can be used for the measurement of the big electric current of DC circuit, and the principle same general is convenient.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although the present invention is had been described in detail with reference to the foregoing description, those of ordinary skill in the field are to be understood that: still can make amendment or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (8)
1. the current sensor based on resistance alloys is characterized in that, described current sensor comprises resistance alloys, voltage measurement unit, power supply unit and controller;
Described resistance alloys seals in circuit-under-test; Described voltage measurement unit is measured the voltage at described resistance alloys two ends and is passed to described controller; Described controller calculates the current value and the output of circuit-under-test according to described resistance alloys resistance;
Described power supply unit is described voltage measurement unit and the power supply of described controller.
2. current sensor as claimed in claim 1 is characterized in that, described voltage measurement unit is connected in parallel on described resistance alloys two ends, and is connected with described controller;
Described power supply unit is connected with described controller with described voltage measurement unit respectively.
3. current sensor as claimed in claim 1 or 2 is characterized in that described current sensor comprises communication unit, is used for the long-range output of described controller; When described controller when far-end or backstage provide measurement data, transmit by described communication unit;
Described power supply unit is given described communication unit power supply.
4. current sensor as claimed in claim 1 or 2 is characterized in that the resistance of described resistance alloys is less than 0.001 ohm.
5. current sensor as claimed in claim 1 or 2 is characterized in that described voltage measurement unit comprises the secondary electron loop;
Described secondary electron loop comprises voltage induced device, analog to digital converter and DSP microprocessor;
Described DSP microprocessor is controlled the voltage that described voltage induced measurement device goes out described resistance alloys, passes to analog to digital converter and converts digital signal output to.
6. the implementation method of a current sensor, it is characterized in that, resistance alloys is sealed in circuit-under-test, described voltage measurement unit is measured the voltage at described resistance alloys two ends and is passed to described controller, and described controller calculates the current value and the output of circuit-under-test according to described resistance alloys resistance; Wherein, described power supply unit is described voltage measurement unit and the power supply of described controller.
7. implementation method as claimed in claim 6 is characterized in that, when described controller when far-end or backstage provide measurement data, described controller transmits by communication unit.
8. implementation method as claimed in claim 6 is characterized in that, described power supply unit provides direct current 24V voltage for the communication unit of described voltage measurement unit, described controller.
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| CN201310103562.4A CN103217565B (en) | 2013-03-28 | 2013-03-28 | A kind of current sensor and its implementation based on resistance alloys |
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| CN201310103562.4A CN103217565B (en) | 2013-03-28 | 2013-03-28 | A kind of current sensor and its implementation based on resistance alloys |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2715168Y (en) * | 2004-08-06 | 2005-08-03 | 深圳市和而泰电子科技有限公司 | A current detection circuit |
| CN200989919Y (en) * | 2006-11-02 | 2007-12-12 | 熊猫电子集团有限公司 | Electric current monitor for power station |
| CN101533043A (en) * | 2009-04-20 | 2009-09-16 | 上海汽车集团股份有限公司 | Test system for vehicle quiescent current |
| CN101639496A (en) * | 2008-07-30 | 2010-02-03 | 比亚迪股份有限公司 | Method and system for testing current consumption |
| CN102841260A (en) * | 2012-09-24 | 2012-12-26 | 哈尔滨工业大学 | DC microresistivity measuring system |
-
2013
- 2013-03-28 CN CN201310103562.4A patent/CN103217565B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2715168Y (en) * | 2004-08-06 | 2005-08-03 | 深圳市和而泰电子科技有限公司 | A current detection circuit |
| CN200989919Y (en) * | 2006-11-02 | 2007-12-12 | 熊猫电子集团有限公司 | Electric current monitor for power station |
| CN101639496A (en) * | 2008-07-30 | 2010-02-03 | 比亚迪股份有限公司 | Method and system for testing current consumption |
| CN101533043A (en) * | 2009-04-20 | 2009-09-16 | 上海汽车集团股份有限公司 | Test system for vehicle quiescent current |
| CN102841260A (en) * | 2012-09-24 | 2012-12-26 | 哈尔滨工业大学 | DC microresistivity measuring system |
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