CN203929870U - A kind of superpotential harvester based on Zinc-oxide piezoresistor - Google Patents
A kind of superpotential harvester based on Zinc-oxide piezoresistor Download PDFInfo
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- CN203929870U CN203929870U CN201420177319.7U CN201420177319U CN203929870U CN 203929870 U CN203929870 U CN 203929870U CN 201420177319 U CN201420177319 U CN 201420177319U CN 203929870 U CN203929870 U CN 203929870U
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- oxide varistor
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- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 title claims abstract description 160
- 229960001296 zinc oxide Drugs 0.000 title claims abstract description 80
- 239000011787 zinc oxide Substances 0.000 title claims abstract description 80
- 238000002955 isolation Methods 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 9
- 238000005259 measurement Methods 0.000 abstract description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005672 electromagnetic field Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000013341 scale-up Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
A superpotential harvester based on Zinc-oxide piezoresistor, the input end of Zinc-Oxide Arrester Z1 is connected to circuit to be measured, and output terminal is connected to the input end of the second zinc oxide varistor valve Z3, the output head grounding of the second zinc oxide varistor valve Z3; The input end of isolation sample circuit is connected to the input end of the second zinc oxide varistor valve Z3.Also comprise overvoltage crowbar, the first zinc oxide varistor valve Z2 and electric discharge counting circuit.The utility model by arranging zinc oxide varistor valve below primary side lightning arrester, from gathering voltage signal, zinc oxide varistor valve extrapolates the actual superpotential of test line according to the dividing potential drop relation of the volt-ampere characteristic of Zinc-oxide piezoresistor, valve block and certain amplifier ratio, when field measurement, anti-jamming signal ability is strong, power-frequency overvoltage, switching overvoltage and the thunder and lightning overvoltage signal of test line can be accurately collected, the highlyest the signal that frequency is 40MHz can be collected.
Description
Technical field
The utility model relates to voltage signal acquisition technical field, specifically a kind of superpotential harvester based on Zinc-oxide piezoresistor.
Background technology
Superpotential on-the-spot test at present mainly gathers voltage signal at voltage transformer secondary side; due to secondary device to external world the susceptibility of electromagnetic interference (EMI) far above traditional protection opertaing device, very easily coupled room radiation and electromagnetic field of the signal cable in Microcomputer Protection and automation equipment and power supply polar curve.The electromagnetic field that the meetings such as thunderbolt, system short-circuit fault, switching manipulation produce transition causes intense electromagnetic to disturb to the collection of secondary side information.There is ferroresonance and magnetic saturation phenomenon in conventional voltage mutual inductor and capacitance type potential transformer, high frequency respective differences, and the quick protection based on high frequency transient component is difficult to realize.When new-style electronic mutual inductor carries out signals collecting because the existence of distributed capacitance and the impact of filtering circuit cause collection signal distortion even to be lost.
Utility model content
The purpose of this utility model is to provide a kind of superpotential harvester based on Zinc-oxide piezoresistor, by below primary side lightning arrester, zinc oxide varistor valve being set, from gathering voltage signal, zinc oxide varistor valve extrapolates the actual superpotential of test line according to the dividing potential drop relation of the volt-ampere characteristic of Zinc-oxide piezoresistor, valve block and certain amplifier ratio.
The technical scheme that realizes the purpose of this utility model is as follows: a kind of superpotential harvester based on Zinc-oxide piezoresistor, the input end of Zinc-Oxide Arrester Z1 is connected to circuit to be measured, output terminal is connected to the input end of the second zinc oxide varistor valve Z3, the output head grounding of the second zinc oxide varistor valve Z3; The input end of isolation sample circuit is connected to the input end of the second zinc oxide varistor valve Z3.
Further, described isolation sample circuit: the input end of voltage follower A1 forms the input end of isolation sample circuit, the output terminal of voltage follower A1 is connected to the in-phase input end of operational amplifier A 2, the inverting input of operational amplifier A 2, by resistance R 5 ground connection, is also connected with capacitor C 2 between the inverting input of operational amplifier A 2 and output terminal; The high level input end of the first photo-coupler is connected to the output terminal of operational amplifier A 2, and the low level input end of the first photo-coupler is connected to the high level input end of the second photo-coupler, the low level input end grounding of the second photo-coupler; The output terminal of the first photo-coupler is connected to the input end of voltage follower A3, and the output terminal of the second photo-coupler is connected to the inverting input of operational amplifier A 2; The input end of voltage follower A3 is by resistance R 6 ground connection, and output terminal forms the output terminal of isolation sample circuit.
Further, also comprise overvoltage crowbar: be made up of more than one diode series aiding connection, positive pole is connected to the input end of the second zinc oxide varistor valve Z3, and negative pole is connected to the output terminal of the second zinc oxide varistor valve Z3.
Further, also comprise the first zinc oxide varistor valve Z2 and electric discharge counting circuit; The input end of the first zinc oxide varistor valve Z2 is connected to the output terminal of Zinc-Oxide Arrester Z1, and the output terminal of the first zinc oxide varistor valve Z2 is connected to the input end of the second zinc oxide varistor valve Z3; Electric discharge counting circuit: the input end of bridge rectifier circuit is connected respectively to input end and the output terminal of the first zinc oxide varistor valve Z2; Current-limiting resistance R4 is successively after series electrical magnetic counter coil L and galvanometer A, then after in parallel with capacitor C 1, forms the load of bridge rectifier circuit.
Technique effect of the present utility model is, a kind of superpotential harvester based on Zinc-oxide piezoresistor, when field measurement, anti-jamming signal ability is strong, power-frequency overvoltage, switching overvoltage and the thunder and lightning overvoltage signal of test line can be accurately collected, the highlyest the signal that frequency is 40MHz can be collected.
Brief description of the drawings
Fig. 1 is system construction drawing of the present utility model.
Fig. 2 is the circuit theory diagrams of the utility model the first embodiment.
Fig. 3 is the circuit theory diagrams of the utility model the second embodiment.
Embodiment
As shown in Figure 1, a kind of superpotential harvester based on Zinc-oxide piezoresistor, the input end of Zinc-Oxide Arrester Z1 is connected to circuit to be measured, and output terminal is connected to the input end of the second zinc oxide varistor valve Z3, the output head grounding of the second zinc oxide varistor valve Z3; The input end of isolation sample circuit is connected to the input end of the second zinc oxide varistor valve Z3, and the output terminal of isolation sample circuit is connected to surveying instrument.
Lightning arrester is selected the gapless Zinc-Oxide Arrester with good non-linear volt-ampere characteristic, selects suitable model according to test line electric pressure.Under lightning arrester, valve block is set; valve block is made up of the zinc oxide varistor of some; valve plate material is identical with selected lightning arrester internal nonlinearity material behavior; avoid nonlinear curve inconsistent and bring interference to Measurement and analysis; the elementary cell zinc oxide varistor quantity of valve block is too much unsuitable, prevents the unnecessary rising of residual voltage of lightning arrester and disturbs protected circuit operation., containing capacitor and inductor original paper, can not there is not electromagnetic oscillation in Zinc-oxide piezoresistor, can the superpotential frequency response of true complete reaction.For preventing electromagnetic interference (EMI), the external radome of surveying instrument, measures cable and adopts coaxial cable for high frequency.
Isolate sample circuit as shown in Figure 2: the input end of voltage follower A1 forms the input end of isolation sample circuit, the output terminal of voltage follower A1 is connected to the in-phase input end of operational amplifier A 2, the inverting input of operational amplifier A 2, by resistance R 5 ground connection, is also connected with capacitor C 2 between the inverting input of operational amplifier A 2 and output terminal; The high level input end of the first photo-coupler is connected to the output terminal of operational amplifier A 2, and the low level input end of the first photo-coupler is connected to the high level input end of the second photo-coupler, the low level input end grounding of the second photo-coupler; The output terminal of the first photo-coupler is connected to the input end of voltage follower A3, and the output terminal of the second photo-coupler is connected to the inverting input of operational amplifier A 2; The input end of voltage follower A3 is by resistance R 6 ground connection.
The voltage signal at the second zinc oxide varistor valve Z3 two ends is Ui, is Vi through voltage follower A1 output signal.Photoisolator is high-speed type photoisolator, and the fastest response time can be lower than 10ns, and maximum frequency response can reach 40MHz.Inside has encapsulated two separate optocouplers, and every a slice optocoupler is by a light emitting diode and phototriode composition.The forward voltage drop of light emitting diode and the collector current of phototriode are not linear, cause through not being linear relationship between the output signal after photoelectrical coupler and input signal.Amplifier A2 improves the linearity of input/output signal for forming negative-feedback circuit, amplifier A3 forms voltage follower, strengthens load-carrying ability.After the voltage follower that negative-feedback circuit, photoelectrical coupler, the amplifier A3 that sampled voltage signal Vi forms via amplifier A2 forms, become output signal Vo.Vo=(R6/R5) Vi, scale-up factor is determined by the size of R6, R5.Can extrapolate the actual superpotential of test line according to the volt-ampere characteristic of Zinc-oxide piezoresistor and valve block dividing potential drop relation by the data of measuring instrument records.
In Fig. 2, overvoltage crowbar is made up of more than one diode series aiding connection, and positive pole is connected to the input end of the second zinc oxide varistor valve Z3, and negative pole is connected to the output terminal of the second zinc oxide varistor valve Z3.Number of diodes is definite by surveying instrument input voltage higher limit, and holding circuit threshold values is lower than surveying instrument input voltage higher limit.Get voltage by known this valve block of dividing potential drop relation very little, holding circuit can not clamped down on valve block both end voltage and effective protection instrument.When superpotential high especially, when electric current is large especially, the diode group conducting in holding circuit, large electric current enters ground, protection instrument from holding circuit.
Fig. 3 has provided further embodiment.Also comprise the first zinc oxide varistor valve Z2 and electric discharge counting circuit; The input end of the first zinc oxide varistor valve Z2 is connected to the output terminal of Zinc-Oxide Arrester Z1, and the output terminal of the first zinc oxide varistor valve Z2 is connected to the input end of the second zinc oxide varistor valve Z3; Electric discharge counting circuit: the input end of bridge rectifier circuit is connected respectively to input end and the output terminal of the first zinc oxide varistor valve Z2; Current-limiting resistance R4 is successively after series electrical magnetic counter coil L and galvanometer A, then after in parallel with capacitor C 1, forms the load of bridge rectifier circuit.
The utilization of electric discharge counting circuit is by afterflow pressure on the first zinc oxide varistor valve Z2 of lightning arrester dash current, through silicon dridge type rectifier, unidirectional to capacitor charging, and with direct current, message register coil discharge is made counter suction moving once, realize the number of times of operation of recording.Simultaneously owing to having rectifier bridge in electric discharge counting circuit, in the time that the first zinc oxide varistor valve Z2 two ends Overvoltage Amplitude reaches certain level, silicon cell in rectification circuit can cut ripple to over-voltage waveform, cause wave form distortion to affect Over-voltage Analysis, so can not get measuring-signal from the first zinc oxide varistor valve Z2 two ends.
Taking the superpotential harvester based on Zinc-oxide piezoresistor shown in Fig. 3 as example, establish Zinc-Oxide Arrester Z1 and the first zinc oxide varistor valve Z2, the contained resistor disc number of the second Zinc-oxide piezoresistor Z3 is respectively n1, n2, n3.Before test, first measure the series voltage of lightning arrester below two-stage valve block, conventionally setting sampling voltage under power-frequency voltage is 5v left and right, thereby obtains the intrinsic standoff ratio of the definite two-stage valve block of resistance of linear zone according to the volt-ampere characteristic of Zinc-oxide piezoresistor.
On surveying instrument, show that magnitude of voltage is Vo, test line virtual voltage is
.
Claims (5)
1. the superpotential harvester based on Zinc-oxide piezoresistor, it is characterized in that, the input end of Zinc-Oxide Arrester (Z1) is connected to circuit to be measured, output terminal is connected to the input end of the second zinc oxide varistor valve (Z3), the output head grounding of the second zinc oxide varistor valve (Z3); The input end of isolation sample circuit is connected to the input end of the second zinc oxide varistor valve (Z3).
2. a kind of superpotential harvester based on Zinc-oxide piezoresistor according to claim 1, it is characterized in that, described isolation sample circuit: the input end of voltage follower A1 forms the input end of isolation sample circuit, the output terminal of voltage follower A1 is connected to the in-phase input end of operational amplifier A 2, the inverting input of operational amplifier A 2, by resistance R 5 ground connection, is also connected with capacitor C 2 between the inverting input of operational amplifier A 2 and output terminal; The high level input end of the first photo-coupler is connected to the output terminal of operational amplifier A 2, and the low level input end of the first photo-coupler is connected to the high level input end of the second photo-coupler, the low level input end grounding of the second photo-coupler; The output terminal of the first photo-coupler is connected to the input end of voltage follower A3, and the output terminal of the second photo-coupler is connected to the inverting input of operational amplifier A 2; The input end of voltage follower A3 is by resistance R 6 ground connection, and output terminal forms the output terminal of isolation sample circuit.
3. any one superpotential harvester based on Zinc-oxide piezoresistor according to claim 1 and 2; it is characterized in that; also comprise overvoltage crowbar: formed by more than one diode series aiding connection; positive pole is connected to the input end of the second zinc oxide varistor valve (Z3), and negative pole is connected to the output terminal of the second zinc oxide varistor valve (Z3).
4. any one superpotential harvester based on Zinc-oxide piezoresistor according to claim 1 and 2, is characterized in that, also comprises the first zinc oxide varistor valve (Z2) and electric discharge counting circuit; The input end of the first zinc oxide varistor valve (Z2) is connected to the output terminal of Zinc-Oxide Arrester (Z1), and the output terminal of the first zinc oxide varistor valve (Z2) is connected to the input end of the second zinc oxide varistor valve (Z3); Electric discharge counting circuit: the input end of bridge rectifier circuit is connected respectively to input end and the output terminal of the first zinc oxide varistor valve (Z2); Current-limiting resistance R4 is successively after series electrical magnetic counter coil L and galvanometer A, then after in parallel with capacitor C 1, forms the load of bridge rectifier circuit.
5. a kind of superpotential harvester based on Zinc-oxide piezoresistor according to claim 3, is characterized in that, also comprises the first zinc oxide varistor valve (Z2) and electric discharge counting circuit; The input end of the first zinc oxide varistor valve (Z2) is connected to the output terminal of Zinc-Oxide Arrester (Z1), and the output terminal of the first zinc oxide varistor valve (Z2) is connected to the input end of the second zinc oxide varistor valve (Z3); Electric discharge counting circuit: the input end of bridge rectifier circuit is connected respectively to input end and the output terminal of the first zinc oxide varistor valve (Z2); Current-limiting resistance R4 is successively after series electrical magnetic counter coil L and galvanometer A, then after in parallel with capacitor C 1, forms the load of bridge rectifier circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420177319.7U CN203929870U (en) | 2014-04-12 | 2014-04-12 | A kind of superpotential harvester based on Zinc-oxide piezoresistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420177319.7U CN203929870U (en) | 2014-04-12 | 2014-04-12 | A kind of superpotential harvester based on Zinc-oxide piezoresistor |
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| CN203929870U true CN203929870U (en) | 2014-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420177319.7U Expired - Lifetime CN203929870U (en) | 2014-04-12 | 2014-04-12 | A kind of superpotential harvester based on Zinc-oxide piezoresistor |
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| CN (1) | CN203929870U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104076193A (en) * | 2014-04-12 | 2014-10-01 | 国家电网公司 | Overvoltage collecting device based on zinc oxide varistor |
| CN106483432A (en) * | 2015-09-02 | 2017-03-08 | 斯凯孚公司 | Partial Discharge Detection using resistance decrement method |
| CN107831356A (en) * | 2017-12-07 | 2018-03-23 | 广东电网有限责任公司电力科学研究院 | A kind of transformer transient overvoltage and sleeve pipe dielectric loss signal synchronous collection device |
| CN108667000A (en) * | 2018-05-07 | 2018-10-16 | 中国能源建设集团甘肃省电力设计院有限公司 | A kind of ferromagnetic resonance detection of large-sized photovoltaic power station and restraining device |
| CN110988444A (en) * | 2019-11-21 | 2020-04-10 | 深圳供电局有限公司 | Zinc oxide lightning arrester voltage divider, overvoltage detection lightning arrester and detection method |
-
2014
- 2014-04-12 CN CN201420177319.7U patent/CN203929870U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104076193A (en) * | 2014-04-12 | 2014-10-01 | 国家电网公司 | Overvoltage collecting device based on zinc oxide varistor |
| CN106483432A (en) * | 2015-09-02 | 2017-03-08 | 斯凯孚公司 | Partial Discharge Detection using resistance decrement method |
| CN107831356A (en) * | 2017-12-07 | 2018-03-23 | 广东电网有限责任公司电力科学研究院 | A kind of transformer transient overvoltage and sleeve pipe dielectric loss signal synchronous collection device |
| CN107831356B (en) * | 2017-12-07 | 2023-05-23 | 广东电网有限责任公司电力科学研究院 | Transformer transient overvoltage and sleeve dielectric loss signal synchronous acquisition device |
| CN108667000A (en) * | 2018-05-07 | 2018-10-16 | 中国能源建设集团甘肃省电力设计院有限公司 | A kind of ferromagnetic resonance detection of large-sized photovoltaic power station and restraining device |
| CN110988444A (en) * | 2019-11-21 | 2020-04-10 | 深圳供电局有限公司 | Zinc oxide lightning arrester voltage divider, overvoltage detection lightning arrester and detection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20141105 Effective date of abandoning: 20170623 |
|
| AV01 | Patent right actively abandoned |