CN204495915U - Electric-field sensor and ac high-voltage signal phase non-contact measurement apparatus - Google Patents
Electric-field sensor and ac high-voltage signal phase non-contact measurement apparatus Download PDFInfo
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- CN204495915U CN204495915U CN201520073154.3U CN201520073154U CN204495915U CN 204495915 U CN204495915 U CN 204495915U CN 201520073154 U CN201520073154 U CN 201520073154U CN 204495915 U CN204495915 U CN 204495915U
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- 238000005259 measurement Methods 0.000 title claims abstract description 57
- 230000005684 electric field Effects 0.000 title claims abstract description 33
- 238000009413 insulation Methods 0.000 claims abstract description 17
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- 238000006243 chemical reaction Methods 0.000 claims description 10
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- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 3
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 abstract description 3
- 238000005070 sampling Methods 0.000 description 6
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- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Abstract
The utility model provides a kind of electric-field sensor and ac high-voltage signal phase non-contact measurement apparatus, comprises the first pole plate, the second pole plate, insulation module, measurement electric capacity and phase correction driving circuit; Wherein, described first pole plate and described second pole plate are oppositely arranged; One end of described measurement electric capacity connects described first pole plate, and the other end connects described second pole plate; The input end of described phase correction driving circuit connects the two ends of described measurement electric capacity; Described insulation module is arranged between described first pole plate and described second pole plate; Described measurement electric capacity and described phase correction driving circuit are arranged on inside described insulation module.The utility model is provided with phase correction driving circuit, ensures output signal and tested voltage signal zero phase difference on the one hand; On the other hand for electric-field sensor increases driving force, ensure the output that signal stabilization is correct.
Description
Technical field
The utility model relates to ac high-voltage signal phase and measures, and particularly, relates to a kind of electric-field sensor and ac high-voltage signal phase non-contact measurement apparatus.
Background technology
Alternating voltage phase value is measuring object important in electric detection system and control system.Alternating voltage phase is accurately measured fast has become research topic important in production scientific research, and it has important using value to the insulation dielectric loss, applied power, useful power, power factor etc. of studying such as equipment.But for ac high-voltage signal, realize phase place high-acruracy survey not a duck soup.
At present for the measurement of high-voltage signal, because signal amplitude is excessive, mainly measured by voltage transformer (VT) (PT) low-side signal.But but due to the existence of the phase differential of PT own, make to there occurs phase shift between low-pressure side voltage and high side voltage, and the change of working voltage, frequency and load all can cause PT both sides phase angle difference to have larger change, impact to voltage signal phase measuring accuracy.In addition, also there is very large potential safety hazard in contact type measurement, and wiring or misoperation can cause the damage of personnel equipment.
Utility model content
For defect of the prior art, the purpose of this utility model is to provide a kind of electric-field sensor and ac high-voltage signal phase non-contact measurement apparatus.
According to the electric-field sensor that an aspect of the present utility model provides, comprise the first pole plate, the second pole plate, insulation module, measurement electric capacity and phase correction driving circuit;
Wherein, described first pole plate and described second pole plate are oppositely arranged; One end of described measurement electric capacity connects described first pole plate, and the other end connects described second pole plate; The input end of described phase correction driving circuit connects the two ends of described measurement electric capacity;
Described insulation module is arranged between described first pole plate and described second pole plate; Described measurement electric capacity and described phase correction driving circuit are arranged on inside described insulation module.
Preferably, described phase correction driving circuit comprises phase-correcting circuit part and driving circuit;
Described phase-correcting circuit part comprises resistance R
1with electric capacity C
1; Described driving circuit comprises amplifier A
1, amplifier A
2, amplifier A
3, resistance R
2, resistance R
3, resistance R
4, resistance R
5, resistance R
6, resistance R
7with resistance R
8;
Wherein, electric capacity C
1with resistance R
1two ends connect the two ends of described measurement electric capacity respectively; Amplifier A
1in-phase input end connect one end of described measurement electric capacity, amplifier A
2in-phase input end connect the other end of described measurement electric capacity, described resistance R
2one end connect described amplifier A
1inverting input, the other end connects described amplifier A
2inverting input; Described resistance R
3one end connect described amplifier A
1output terminal, the other end connects described amplifier A
1inverting input; Described resistance R
4one end connect described amplifier A
2output terminal, the other end connects described amplifier A
2inverting input; Described resistance R
5one end connect described amplifier A
3in-phase input end, the other end connects described amplifier A
1output terminal; Described resistance R
6one end connect described amplifier A
3inverting input, the other end connects described amplifier A
2output terminal; Described resistance R
7one end connect described amplifier A
3in-phase input end, other end ground connection; Described resistance R
8one end connect described amplifier A
3inverting input, the other end connects described amplifier A
3output terminal.
Preferably, parallel described second pole plate of described first pole plate.
Preferably, described first pole plate and described second pole plate adopt metal material to make.
Preferably, described insulation module adopts polyvinyl resin or carbon to make.
According to the ac high-voltage signal phase non-contact measurement apparatus that another aspect of the present utility model provides, comprise described electric-field sensor, also comprise signal measurement terminal; In described electric-field sensor, the output terminal of phase correction driving circuit connects described signal measurement terminal.
Preferably, described signal measurement terminal comprises programmable amplifying circuit, fourth-order band-pass filtering circuit, squared circuit, analog to digital conversion circuit, primary processor DSP and coprocessor CPLD;
Wherein, the described output terminal of phase correction driving circuit is connected with the input end of programmable amplifying circuit, the output terminal of programmable amplifying circuit is connected with the input end of fourth-order band-pass filtering circuit and analog to digital conversion circuit respectively, the output terminal of analog to digital conversion circuit is connected with primary processor DSP, the output terminal of fourth-order band-pass filtering circuit is connected with squared circuit input end, and squared circuit output end is connected with coprocessor CPLD; Described coprocessor CPLD connects described primary processor DSP.
Preferably, EMIF parallel bus is also comprised;
Described coprocessor CPLD connects described primary processor DSP by described EMIF parallel bus.
Compared with prior art, the utility model has following beneficial effect:
1, the utility model is provided with phase correction driving circuit, ensures output signal and tested voltage signal zero phase difference on the one hand; On the other hand for electric-field sensor increases driving force, ensure the output that signal stabilization is correct;
2, the utility model can achieve the non-contact measurement of high-voltage AC signal phase place, not only strengthens the security of measurement, also drastically increases degree of accuracy and the accuracy of high-voltage signal measurement;
3, the utility model utilizes electric-field sensor, can by the measurement to electric field, indirectly complete the non-contact measurement to high-voltage signal, effectively solve in contact measurement method the repacking that it also avoid while the phase differential problem of PT high-low pressure both sides circuit connection, and then improve precision and the security of high-voltage signal phase measurement.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present utility model will become more obvious:
Fig. 1 is the structural representation of ac high-voltage signal phase non-contact measurement apparatus in the utility model;
Fig. 2 is the structural representation of electric-field sensor in the utility model;
Fig. 3 is the structural representation of phase correction driving circuit in the utility model.
Embodiment
Below in conjunction with specific embodiment, the utility model is described in detail.Following examples will contribute to those skilled in the art and understand the utility model further, but not limit the utility model in any form.It should be pointed out that to those skilled in the art, without departing from the concept of the premise utility, some distortion and improvement can also be made.These all belong to protection domain of the present utility model.
In the present embodiment, the electric-field sensor that the utility model provides, comprises the first pole plate, the second pole plate, insulation module, measurement electric capacity and phase correction driving circuit; Wherein, described first pole plate and described second pole plate are oppositely arranged; One end of described measurement electric capacity connects described first pole plate, and the other end connects described second pole plate; The input end of described phase correction driving circuit connects the two ends of described measurement electric capacity; Described insulation module is arranged between described first pole plate and described second pole plate; Described measurement electric capacity and described phase correction driving circuit are arranged on inside described insulation module, i.e. measurement electric capacity and phase correction driving circuit are wrapped in wherein by insulation module.Parallel described second pole plate of described first pole plate.Described first pole plate and described second pole plate adopt metal material to make.Described insulation module adopts polyvinyl resin or carbon to make.
Described phase correction driving circuit comprises phase-correcting circuit part and driving circuit;
Described phase-correcting circuit part comprises resistance R1 and electric capacity C1; Described driving circuit comprises amplifier A1, amplifier A2, amplifier A3, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7 and resistance R8;
Wherein, electric capacity C1 and the two ends of resistance R1 are connected the two ends of described measurement electric capacity respectively; The in-phase input end of amplifier A1 connects one end of described measurement electric capacity, the in-phase input end of amplifier A2 connects the other end of described measurement electric capacity, one end of described resistance R2 connects the inverting input of described amplifier A1, and the other end connects the inverting input of described amplifier A2; One end of described resistance R3 connects the output terminal of described amplifier A1, and the other end connects the inverting input of described amplifier A1; One end of described resistance R4 connects the output terminal of described amplifier A2, and the other end connects the inverting input of described amplifier A2; One end of described resistance R5 connects the in-phase input end of described amplifier A3, and the other end connects the output terminal of described amplifier A1; One end of described resistance R6 connects the inverting input of described amplifier A3, and the other end connects the output terminal of described amplifier A2; One end of described resistance R7 connects the in-phase input end of described amplifier A3, other end ground connection; One end of described resistance R8 connects the inverting input of described amplifier A3, and the other end connects the output terminal of described amplifier A3.Described phase-correcting circuit part is used for the frequency domain response being regulated whole electric-field sensor by build-out resistor value and capacitance, under the prerequisite ensureing certain amplitude-frequency response, realizing phase-frequency response under measured signal frequency is zero, i.e. measured signal and sensor output signal zero phase difference.The differential amplifier circuit that driving circuit is formed, utilizes the feature that its input impedance is large and suppression common mode interference ability is strong, realizes the driving of measured signal.
The ac high-voltage signal phase non-contact measurement apparatus that the utility model provides, comprises described electric-field sensor, also comprises signal measurement terminal; In described electric-field sensor, the output terminal of phase correction driving circuit connects described signal measurement terminal.Described signal measurement terminal comprises programmable amplifying circuit, fourth-order band-pass filtering circuit, squared circuit, analog to digital conversion circuit, primary processor DSP and coprocessor CPLD; Wherein, the described output terminal of phase correction driving circuit is connected with the input end of programmable amplifying circuit, the output terminal of programmable amplifying circuit is connected with the input end of fourth-order band-pass filtering circuit and analog to digital conversion circuit respectively, the output terminal of analog to digital conversion circuit is connected with primary processor DSP, the output terminal of fourth-order band-pass filtering circuit is connected with squared circuit input end, and squared circuit output end is connected with coprocessor CPLD; Described coprocessor CPLD connects described primary processor DSP.
The ac high-voltage signal phase non-contact measurement apparatus that the utility model provides, also comprises EMIF parallel bus; Described coprocessor CPLD connects described primary processor DSP by described EMIF parallel bus.
The principle of work of the ac high-voltage signal phase non-contact measurement apparatus based on electric-field sensor that the utility model provides is as follows:
One, be placed near high-tension bus-bar by the electric-field sensor that the utility model provides, the electric-field sensor that the utility model provides is responded to the alternating electric field near high-voltage signal, and then realizes the collection of high-voltage signal.
Two, the electric-field sensor that provides of the utility model is to measure the voltage at electric capacity two ends as measuring-signal.Measuring-signal will through phase correction driving circuit before output, and phase correction driving circuit has two effects: ensure output signal and tested voltage signal zero phase difference on the one hand; The electric-field sensor provided for the utility model on the other hand increases driving force, ensures the output that signal stabilization is correct.
The final output signal of the electric-field sensor that the signal three, after the process of phase correction driving circuit provides as the utility model, is admitted to measuring terminals device.In order to meet the requirement of sampling with high precision to signal amplitude, after the electric-field sensor output signal that the utility model provides enters measuring terminals, first carry out differential amplification through programmable amplifying circuit.In the implementation process of the ac high-voltage signal phase non-contact measurement apparatus based on electric-field sensor provided at the utility model, the enlargement factor of programmable amplifying circuit is determined according to the magnitude of original signal amplitude, to meet the high-acruracy survey of wider high-voltage signal.
Four, the signal after amplifying is divided into two-way, and wherein a road carries out being admitted to the squared circuit be made up of voltage comparator after filtering process through fourth-order band-pass filtering circuit, sends into coprocessor CPLD after sinusoidal signal being converted into square-wave signal.
Five, after coprocessor CPLD carries out High Precision Frequency to the square-wave signal sent into, calculate sampling rate according to measured signal frequency and each cycle sampling number, and send to primary processor DSP by EMIF parallel bus.
Six, the sampling rate that primary processor DSP sends according to CPLD controls analog to digital conversion circuit carries out 16bit resolution sampling with high precision to another road signal after amplifying, and utilize Hanning window to carry out data prediction to the raw data obtained after sampling, the validity of image data to ensure.
Seven, to the signal valid data after data prediction, primary processor DSP utilizes the method for Fast Fourier Transform (FFT) to discrete digital signal, namely signal valid data carry out digital spectrum analysis, thus obtain the frequency spectrum of measured signal, extract the phase place of first-harmonic, and then obtain the phase information of tested high-voltage AC signal.
Above specific embodiment of the utility model is described.It is to be appreciated that the utility model is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present utility model.
Claims (8)
1. an electric-field sensor, is characterized in that, comprises the first pole plate, the second pole plate, insulation module, measurement electric capacity and phase correction driving circuit;
Wherein, described first pole plate and described second pole plate are oppositely arranged; One end of described measurement electric capacity connects described first pole plate, and the other end connects described second pole plate; The input end of described phase correction driving circuit connects the two ends of described measurement electric capacity;
Described insulation module is arranged between described first pole plate and described second pole plate; Described measurement electric capacity and described phase correction driving circuit are arranged on inside described insulation module.
2. electric-field sensor according to claim 1, is characterized in that, described phase correction driving circuit comprises phase-correcting circuit part and driving circuit;
Described phase-correcting circuit part comprises resistance R
1with electric capacity C
1; Described driving circuit comprises amplifier A
1, amplifier A
2, amplifier A
3, resistance R
2, resistance R
3, resistance R
4, resistance R
5, resistance R
6, resistance R
7with resistance R
8;
Wherein, electric capacity C
1with resistance R
1two ends connect the two ends of described measurement electric capacity respectively; Amplifier A
1in-phase input end connect one end of described measurement electric capacity, amplifier A
2in-phase input end connect the other end of described measurement electric capacity, described resistance R
2one end connect described amplifier A
1inverting input, the other end connects described amplifier A
2inverting input; Described resistance R
3one end connect described amplifier A
1output terminal, the other end connects described amplifier A
1inverting input; Described resistance R
4one end connect described amplifier A
2output terminal, the other end connects described amplifier A
2inverting input; Described resistance R
5one end connect described amplifier A
3in-phase input end, the other end connects described amplifier A
1output terminal; Described resistance R
6one end connect described amplifier A
3inverting input, the other end connects described amplifier A
2output terminal; Described resistance R
7one end connect described amplifier A
3in-phase input end, other end ground connection; Described resistance R
8one end connect described amplifier A
3inverting input, the other end connects described amplifier A
3output terminal.
3. electric-field sensor according to claim 1, is characterized in that, parallel described second pole plate of described first pole plate.
4. electric-field sensor according to claim 1, is characterized in that, described first pole plate and described second pole plate adopt metal material to make.
5. electric-field sensor according to claim 1, is characterized in that, described insulation module adopts polyvinyl resin or carbon to make.
6. an ac high-voltage signal phase non-contact measurement apparatus, is characterized in that, comprises the electric-field sensor described in any one of claim 1 to 5, also comprises signal measurement terminal;
In described electric-field sensor, the output terminal of phase correction driving circuit connects described signal measurement terminal.
7. ac high-voltage signal phase non-contact measurement apparatus according to claim 6, it is characterized in that, described signal measurement terminal comprises programmable amplifying circuit, fourth-order band-pass filtering circuit, squared circuit, analog to digital conversion circuit, primary processor DSP and coprocessor CPLD;
Wherein, the described output terminal of phase correction driving circuit is connected with the input end of programmable amplifying circuit, the output terminal of programmable amplifying circuit is connected with the input end of fourth-order band-pass filtering circuit and analog to digital conversion circuit respectively, the output terminal of analog to digital conversion circuit is connected with primary processor DSP, the output terminal of fourth-order band-pass filtering circuit is connected with squared circuit input end, and squared circuit output end is connected with coprocessor CPLD; Described coprocessor CPLD connects described primary processor DSP.
8. ac high-voltage signal phase non-contact measurement apparatus according to claim 7, is characterized in that, also comprise EMIF parallel bus;
Described coprocessor CPLD connects described primary processor DSP by described EMIF parallel bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520073154.3U CN204495915U (en) | 2015-02-02 | 2015-02-02 | Electric-field sensor and ac high-voltage signal phase non-contact measurement apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520073154.3U CN204495915U (en) | 2015-02-02 | 2015-02-02 | Electric-field sensor and ac high-voltage signal phase non-contact measurement apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204495915U true CN204495915U (en) | 2015-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520073154.3U Active CN204495915U (en) | 2015-02-02 | 2015-02-02 | Electric-field sensor and ac high-voltage signal phase non-contact measurement apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108490273A (en) * | 2018-03-28 | 2018-09-04 | 中国科学院电子学研究所 | Electric-field sensor system based on multi-channel switch |
| CN110988503A (en) * | 2019-12-30 | 2020-04-10 | 南京弘毅电气自动化有限公司 | Distribution line power frequency electric field wireless measuring device and measurement correcting method |
-
2015
- 2015-02-02 CN CN201520073154.3U patent/CN204495915U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108490273A (en) * | 2018-03-28 | 2018-09-04 | 中国科学院电子学研究所 | Electric-field sensor system based on multi-channel switch |
| CN110988503A (en) * | 2019-12-30 | 2020-04-10 | 南京弘毅电气自动化有限公司 | Distribution line power frequency electric field wireless measuring device and measurement correcting method |
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| GR01 | Patent grant |