CN110082585A - AC three-phase pressure sensor and its system - Google Patents
AC three-phase pressure sensor and its system Download PDFInfo
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- CN110082585A CN110082585A CN201810070513.8A CN201810070513A CN110082585A CN 110082585 A CN110082585 A CN 110082585A CN 201810070513 A CN201810070513 A CN 201810070513A CN 110082585 A CN110082585 A CN 110082585A
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- 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
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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Abstract
It includes three-phase signal acquisition module, the analog signal processing module connecting with three-phase signal acquisition module and the control module connecting with analog signal processing module that the present invention, which provides a kind of AC three-phase pressure sensor and its system, AC three-phase pressure sensor,；Three-phase signal acquisition module includes three-phase voltage input terminal and the voltage sensor that connect with three-phase voltage input terminal, three-phase voltage input terminal is respectively A phase voltage input terminal, B phase voltage input terminal and C phase voltage input terminal, A phase voltage input terminal, B phase voltage input terminal and C phase voltage input terminal respectively connect a voltage sensor, and voltage sensor is respectively used to receive the voltage signal of A phase voltage input terminal, B phase voltage input terminal and the input of C phase voltage input terminal；Three-phase signal acquisition module is used for collection voltages signal, and collected voltage signal is transferred to analog signal processing module, and analog signal processing module handles the voltage signal received.
Description
Technical field
The present invention relates to sensor technical fields, and in particular to a kind of this AC three-phase voltage sensor and its system.
Background technique
In electric system, from power distribution network to higher voltage class, what is generallyd use is electromagnetic potential mutual inductance transducer
With capacitive divided voltage mutual inductor.But with the swift and violent advance that Chinese society is built, demand of the various industries to electric energy exists
It is gradually increased, the power capacity and voltage class of electric system are also being gradually increased, therefore both conventional voltage transformers exist
The problem of volume, insulation, measurement accuracy and transient state reflection speed etc., comes out with regard to increasingly prominent.And where sensor
Electromagnetic field environment is complex, and tested signal is easy the interference by external electromagnetic wave and the case where distortion occurs.
Summary of the invention
The problem to be solved in the present invention is to provide a kind of AC three-phase pressure sensor and its systems, effectively to inhibit ring
The influence of border interference signal.
An aspect of of the present present invention provides a kind of AC three-phase pressure sensor, it is characterised in that: the AC three-phase voltage
Sensor include three-phase signal acquisition module, the analog signal processing module being connect with the three-phase signal acquisition module and with
The control module of the analog signal processing module connection；
The three-phase signal acquisition module includes three-phase voltage input terminal and connect with the three-phase voltage input terminal
Voltage sensor, the three-phase voltage input terminal are respectively A phase voltage input terminal, B phase voltage input terminal and the input of C phase voltage
End, the A phase voltage input terminal, B phase voltage input terminal and C phase voltage input terminal respectively connect a voltage sensor, described
Voltage sensor is respectively used to receive the voltage of A phase voltage input terminal, B phase voltage input terminal and the input of C phase voltage input terminal
Signal；
The three-phase signal acquisition module is used for collection voltages signal, and collected voltage signal is transferred to the mould
Quasi- signal processing module, the analog signal processing module handle the voltage signal received, so that it is met digital-to-analogue and turn
The amplitude requirement changed.
Preferably, the analog signal processing module includes differential amplifier circuit, scaling circuit and level lifting
Circuit；
The differential amplifier circuit inhibits the common mode component in input voltage, retains and amplifies the difference between input voltage
Signal, effectively to inhibit the influence of environmental disturbances signal；
The scaling circuit is used to adjust the amplitude of voltage signal；
The level lifting circuit controls the sampled voltage of control module within a predetermined range.
Preferably, the control module includes D/A conversion unit, and the D/A conversion unit is electric by the simulation received
Pressure signal is converted into discrete waveform data；
The data transmission unit is for communicating the discrete waveform data received with the external world.
Preferably, the AC three-phase pressure sensor further includes power module, the power module respectively with the letter
Number processing module, control module and data transmission module connection, for being the signal processing module, control module and number
It is powered according to transmission module.
Another aspect of the present invention provides a kind of AC three-phase voltage sensing system, it is characterised in that the AC three-phase
Under voltage sensor system includes an AC three-phase pressure sensor and matches with the AC three-phase pressure sensor
Position machine module；
The slave computer module include digital signal processing unit, parameter control unit and respectively with the digital signal
The data receipt unit that processing unit is connected with the parameter control unit；
For the digital signal processing unit for restoring the voltage signal received, i.e., the number that will be received is electric
Press signals revivification at analog voltage signal；
The digital signal processing unit and the parameter control unit can by the data receipt unit with
It is communicated between the AC three-phase pressure sensor.
Preferably, the slave computer module further includes voltage waveform analysis unit and waveform display unit, the voltage
Waveform analysis unit and the waveform display unit are connect with the digital signal processing unit respectively.
AC three-phase pressure sensor of the invention realizes A, B, C three-phase voltage using D-dot voltage sensor respectively
Acquisition improves the precision of detection, and is provided with differential amplifier circuit, scaling circuit and level and is lifted circuit；Institute
The common mode component in differential amplifier circuit inhibition input voltage is stated, retains and amplify the differential signal between input voltage, to have
Effect inhibits the influence of environmental disturbances signal；The scaling circuit is used to adjust the amplitude of voltage signal；The level lifting
Circuit controls the sampled voltage of control module within a predetermined range, so that the acquisition of entire signal avoids surrounding signals
Influence, meanwhile, provide convenience for later period signals revivification.
Detailed description of the invention
Fig. 1 is the attachment structure schematic diagram of AC three-phase pressure sensor of the invention；
Fig. 2 is the attachment structure schematic diagram of three-phase signal acquisition module of the invention；
Fig. 3 is the circuit diagram of differential amplifier circuit of the invention；
Fig. 4 is the circuit diagram of scaling circuit and level lifting circuit of the invention；
Fig. 5 is the attachment structure schematic diagram of AC three-phase voltage sensing system of the invention.
Specific embodiment
In order to better understand the present invention, the present invention is further retouched with attached drawing combined with specific embodiments below
It states.
Fig. 1 is the attachment structure schematic diagram of AC three-phase pressure sensor of the invention, as shown in Figure 1, a side of the invention
Face provides a kind of AC three-phase pressure sensor, and the AC three-phase pressure sensor includes three-phase signal acquisition module and institute
The analog signal processing module for stating the connection of three-phase signal acquisition module, the control module being connect with the analog signal processing module
And the data transmission module being connect with the control module.
The three-phase signal acquisition module is used for collection voltages signal, and collected voltage signal is transferred to the mould
Quasi- signal processing module, the analog signal processing module handle the voltage signal received, so that it is met digital-to-analogue and turn
The amplitude requirement changed.
The three-phase signal acquisition module includes three-phase voltage input terminal and connect with the three-phase voltage input terminal
Voltage sensor, the three-phase voltage input terminal are respectively A phase voltage input terminal, B phase voltage input terminal and the input of C phase voltage
End, the A phase voltage input terminal, B phase voltage input terminal and C phase voltage input terminal respectively connect a voltage sensor, described
Voltage sensor is respectively used to receive the voltage of A phase voltage input terminal, B phase voltage input terminal and the input of C phase voltage input terminal
Signal.
The voltage sensor can be electromagnetic potential transformer in the prior art, capacitive divided voltage mutual inductor
And D-dot voltage transformer based on field coupling principle etc., the selection of the voltage sensor are not constituted the application
Limitation.As shown in Fig. 2, in one embodiment of the invention, the voltage sensor selects D-dot voltage sensor, D-dot
Voltage sensor is with small in size, insulating requirements are low, structure is simple, dynamic range is wide, measurement accuracy is high and transient state is accordingly fast
The series of advantages such as degree is fast, electric current that D-dot voltage sensor can be very wide to measurement dynamic range, voltage give effectively,
It accurately measures.
The analog signal processing module includes differential amplifier circuit, scaling circuit and level lifting circuit.
The differential amplifier circuit inhibits the common mode component in input voltage, retains and amplifies the difference between input voltage
Signal, effectively to inhibit the influence of environmental disturbances signal.
Electromagnetic field environment as where sensor is complex, and tested signal is easy the interference by external electromagnetic wave
And the case where being distorted, common-mode signal of the extraneous interference signal between sensor electrode, and to the disturbance that electrode generates
Identical, differential signal of the input signal between the electrode with different potentials of D-dot voltage sensor is measured, therefore, if
Remove the common mode component in signal, retains the difference component in simultaneously amplified signal, can effectively inhibit environmental disturbances signal pair
Measurement result bring error.
Fig. 3 shows the electrical block diagram of the differential amplifier circuit, and the differential amplifier circuit includes that operation is put
Big device, the opamp input terminal are separately connected resistance R1, R2, R3 and R4 in parallel, and wherein R1 and R3, R2 and R4 can have
The interference of the inhibition common-mode signal of effect.The input terminal of the operational amplifier is also connected with gain setting resistor RG。
In one embodiment of the invention, operational amplifier uses INA111 amplifier.The speed of INA111 amplifier
Fastly, precision is high, and common-mode rejection ratio is big, its input impedance has reached 1000G Ω, accordingly even when being the frequency in polar region
Working sensor can be made from integral mode, the amplitude-frequency and phase-frequency characteristic of sensor can also be effectively improved by increasing input impedance,
Reduce the induced current of sensor.
The scaling circuit is used to adjust the amplitude of voltage signal.
Under normal conditions, some voltage signals are when being AD converted, amplitude size must within the scope of certain voltage,
Such as in voltage levels, voltage signal magnitude is online lower than the voltage of AD conversion；In low-voltage-grade, voltage signal is wanted
Higher than lower voltage limit, conversion so just can be carried out.Based on the above reasons, the present invention is by Set scale amplifying circuit come to voltage
Signal carries out range-adjusting, can meet the requirement of AD conversion amplitude.
The level lifting circuit controls the sampled voltage of control module within a predetermined range.AD sampling operation has one
Optimum sampling voltage range, and the lower limit of optimum sampling voltage range is 0.Since voltage signal is likely to be less than 0, so this hair
Bright setting level is lifted circuit, makes the voltage signal of input can be in optimum sampling voltage range.
As shown in figure 4, the scaling circuit and the level are lifted circuit using subtraction circuit come complete in the present invention
At, as shown in Fig. 2, in amplifying circuit, according to its resistance parameter, and according to the virtual segment of ideal operational amplificr, it is empty it is disconnected between
Amplifier exports V known to relationshipOWith input Vdif、VrefBetween relationship be
By above-mentioned relation, it can be concluded that, amplifying circuit needs a kind of small noise, offset voltage of input terminal and biased electrical
Small proportional amplifier is flowed, the present invention selects amplifier TLC072.
The analog voltage signal received is converted into discrete waveform data by the control module；The data transmission module
Discrete waveform data for will receive are communicated with the external world.
Further, the AC three-phase pressure sensor further includes power module, the power module respectively with it is described
Signal processing module, control module and data transmission module connection, for for the signal processing module, control module and
Data transmission module is powered.
As shown in figure 5, the present invention also provides a kind of, the AC three-phase voltage including above-mentioned AC three-phase pressure sensor is passed
Sensor system, including an AC three-phase pressure sensor and the slave computer mould to match with the AC three-phase pressure sensor
Block.
The slave computer module include digital signal processing unit, parameter control unit and respectively with the digital signal
The data receipt unit that processing unit is connected with the parameter control unit；The digital signal processing unit and the parameter
Control unit can be by being communicated between the data receipt unit and the AC three-phase pressure sensor, the number
The digital voltage signal received is reduced into mould for restoring the voltage signal received by word signal processing unit
Quasi- voltage signal.
In one embodiment of the invention, pass through between the AC three-phase pressure sensor and the slave computer module
The transmission of wireless telecommunications realization data.
Further, the slave computer module further includes voltage waveform analysis unit and waveform display unit, the electricity
Corrugating analytical unit and the waveform display unit are connect with the digital signal processing unit respectively.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
Finally, it should be noted that obviously, the above embodiment is merely an example for clearly illustrating the present invention, and simultaneously
The non-restriction to embodiment.For those of ordinary skill in the art, it can also do on the basis of the above description
Other various forms of variations or variation out.There is no necessity and possibility to exhaust all the enbodiments.And thus drawn
The obvious changes or variations that Shen goes out are still in the protection scope of this invention.
Claims (6)
1. AC three-phase pressure sensor, it is characterised in that: the AC three-phase pressure sensor includes three-phase signal acquisition mould
It block, the analog signal processing module being connect with the three-phase signal acquisition module and is connect with the analog signal processing module
Control module；
The three-phase signal acquisition module includes three-phase voltage input terminal and the voltage that connect with the three-phase voltage input terminal
Sensor, the three-phase voltage input terminal are respectively A phase voltage input terminal, B phase voltage input terminal and C phase voltage input terminal,
The A phase voltage input terminal, B phase voltage input terminal and C phase voltage input terminal respectively connect a voltage sensor, the voltage
Sensor is respectively used to receive the voltage signal of A phase voltage input terminal, B phase voltage input terminal and the input of C phase voltage input terminal；
The three-phase signal acquisition module is used for collection voltages signal, and collected voltage signal is transferred to the simulation and is believed
Number processing module, the analog signal processing module handle the voltage signal received, it is made to meet digital-to-analogue conversion
Amplitude requirement.
2. AC three-phase pressure sensor according to claim 1, it is characterised in that: the analog signal processing module packet
Include differential amplifier circuit, scaling circuit and level lifting circuit；
The differential amplifier circuit inhibits the common mode component in input voltage, retains and amplifies the letter of the difference between input voltage
Number, effectively to inhibit the influence of environmental disturbances signal；
The scaling circuit is used to adjust the amplitude of voltage signal；
The level lifting circuit controls the sampled voltage of control module within a predetermined range.
3. AC three-phase pressure sensor according to claim 1, it is characterised in that:
The control module includes D/A conversion unit, and the analog voltage signal received is converted by the D/A conversion unit
Discrete waveform data；
The data transmission unit is for communicating the discrete waveform data received with the external world.
4. AC three-phase pressure sensor according to claim 1, it is characterised in that: the AC three-phase pressure sensor
It further include power module, the power module connects with the signal processing module, control module and data transmission module respectively
It connects, for being powered for the signal processing module and control module.
5. AC three-phase voltage sensing system, it is characterised in that the AC three-phase voltage sensing system includes an exchange three
Phase voltage sensor and the slave computer module to match with the AC three-phase pressure sensor；
The slave computer module include digital signal processing unit, parameter control unit and respectively with the Digital Signal Processing
The data receipt unit that unit is connected with the parameter control unit；
The digital signal processing unit is believed the digital voltage received for restoring the voltage signal received
Number it is reduced into analog voltage signal；
The digital signal processing unit and the parameter control unit can by the data receipt unit with it is described
It is communicated between AC three-phase pressure sensor.
6. AC three-phase voltage sensing system according to claim 5, it is characterised in that: the slave computer module is also wrapped
Include voltage waveform analysis unit and waveform display unit, the voltage waveform analysis unit and the waveform display unit point
It is not connect with the digital signal processing unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810070513.8A CN110082585A (en) | 2018-01-25 | 2018-01-25 | AC three-phase pressure sensor and its system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810070513.8A CN110082585A (en) | 2018-01-25 | 2018-01-25 | AC three-phase pressure sensor and its system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110082585A true CN110082585A (en) | 2019-08-02 |
Family
ID=67411901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810070513.8A Pending CN110082585A (en) | 2018-01-25 | 2018-01-25 | AC three-phase pressure sensor and its system |
Country Status (1)
| Country | Link |
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| CN (1) | CN110082585A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115718214A (en) * | 2022-11-16 | 2023-02-28 | 南方电网数字电网研究院有限公司 | Voltage measurement method and device |
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2018
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| CN104237705A (en) * | 2014-09-30 | 2014-12-24 | 沈阳工业大学 | Multi-information fusion online monitoring device and diagnostic method for windings of power transformers |
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Cited By (2)
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| CN115718214A (en) * | 2022-11-16 | 2023-02-28 | 南方电网数字电网研究院有限公司 | Voltage measurement method and device |
| CN115718214B (en) * | 2022-11-16 | 2023-09-15 | 南方电网数字电网研究院有限公司 | Voltage measurement method and device |
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Application publication date: 20190802 |
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