CN105974188A - Three-channel noncontact lower-than-1000V voltage measurement device - Google Patents
Three-channel noncontact lower-than-1000V voltage measurement device Download PDFInfo
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- CN105974188A CN105974188A CN201610442430.8A CN201610442430A CN105974188A CN 105974188 A CN105974188 A CN 105974188A CN 201610442430 A CN201610442430 A CN 201610442430A CN 105974188 A CN105974188 A CN 105974188A
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- 238000005259 measurement Methods 0.000 title abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 6
- 238000004891 communication Methods 0.000 claims abstract description 5
- 238000003860 storage Methods 0.000 claims description 21
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 239000010445 mica Substances 0.000 claims description 4
- 229910052618 mica group Inorganic materials 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
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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
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
Abstract
The invention discloses a three-channel noncontact lower-than-1000V voltage measurement device. The three-channel noncontact lower-than-1000V voltage measurement device comprises a sensor, an operational amplifier circuit, a differential circuit, a measurement circuit, a voltage signal observer, and a data storing and output module. The output end of the sensor is successively connected with a current circuit, the differential circuit, the measurement circuit and the input end of the voltage signal observer. The output end of the voltage signal observer is connected with the input end of the data storing and output module. The three-channel noncontact lower-than-1000V voltage measurement device prevents labor and physical resource which are consumed in establishing an electric connection and greatly simplifies mounting process of a voltage acquisition device by means of noncontact voltage detecting technology. Furthermore through a ZigBee wireless communication module, the three-channel noncontact lower-than-1000V voltage measurement device supports a long-distance wide-range multiple-detecting-point wireless remote monitoring function. The three-channel noncontact lower-than-1000V voltage measurement device has many advantages such as high efficiency and high intuitiveness. The three-channel noncontact lower-than-1000V voltage measurement device facilitates real-time mastering for operation state of a low-voltage distributing network and furthermore has high social benefit.
Description
Technical field
The present invention relates to power electronics measuring instrument field, particularly relate to a kind of triple channel contactless below 1000V voltage measuring apparatus.
Background technology
Electric energy, as being currently being widely used clean energy resource, all plays very important effect in city life staying idle at home and commercial production.Along with China enters the new industrialization epoch, need for electricity is continuing to increase, and the scale of low-voltage network expands the most year by year, and the stability of power supply is just particularly important.
But the use of the impact load such as the irregular access of a large amount of non-linear power equipment and electric arc furnace, directly resulting in mains ripple, voltage waveform is distorted, and seriously reduces the stability of low-voltage distribution network operation.This makes power supply department need the voltage parameter gathering low-voltage network to be analyzed and enter a judgement response, to greatest extent the pollution of the outer bound pair power distribution network of reduction.
But, current voltage detection device mostly is contact type measurement, i.e. requires that wire extracts access device carries out voltage measurement, and this measuring method there is problems in that
1, install very inconvenient, lay test point relatively costly；
2, there is electrical contact between tested wire and test equipment, if operational error, be likely to result in short circuit or electric shock accidents；
3, wire extracts needs to destroy power transmission line insulating barrier, produces potential safety hazard.
Summary of the invention
In order to solve above-mentioned technical problem, it is an object of the invention to: provide a kind of easy for installation, have certain certainty of measurement and the triple channel contactless low-voltage measurement apparatus of wireless remote monitering can be supported.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of triple channel contactless below 1000V voltage measuring apparatus, including:
Tiny signal detector: for the Weak current signal that amount detection level is μ A, and it is amplified and calculus of differences；
Voltage signal observer: for the voltage signal that tiny signal detector exports is carried out data process, utilizes the quantitative relation computing of Weak current and voltage to be measured to try to achieve the voltage effective value in wire to be measured；
Data storage and output module: the data that voltage signal observer exports are stored, and by the way of wired or wireless, carry out data output；
Further, described tiny signal detector includes:
Sensor: include the first metallic plate and the second metallic plate, the 3rd metallic plate, described first metallic plate is directly connected to discharge circuit input, described second metallic plate and the 3rd metallic plate are connected with discharge circuit another two input after pasting mica sheet known to thickness difference and dielectric constant respectively, described first metallic plate and the second metallic plate, the 3rd metallic plate are placed side by side on a pliers, it is fixed on wire to be measured by pliers during use, provides path for small leakage current；
Discharge circuit: for three the Weak current signals flowing through described sensor are amplified and are converted to voltage signal；
Difference channel: the voltage signal amplified by discharge circuit is subtracted each other the external interference being jointly subjected to counteracting, is divided into the two groups: 1st group to be subtracted each other by the voltage in the second loop, metallic plate place and the 3rd loop, metallic plate place；The voltage in the first loop, metallic plate place and the 3rd loop, metallic plate place is subtracted each other by the 2nd group；
Measuring circuit: for the difference in voltage that difference channel exports is measured and carries out analog digital conversion.
Further, described discharge circuit uses LM324.
Further, described difference channel is made up of sampling resistor and subtraction circuit, and described subtraction circuit is made up of operational amplifier, resistance and electric capacity.
Further, the storage of described data and output module include ZigBee wireless communication module.
Further, the storage of described data and output module include USB output module.
Further, the storage of described data and output module include SD card memory module.
Compared to existing technology, the invention has the beneficial effects as follows:
Triple channel contactless low-voltage measurement apparatus easy for installation that the present invention provides, only pliers need to be clamped wire to be measured, sensor is made tightly to fit on wire, can be obtained by the voltage data of circuit, because without resettling electrical connection, the installation of equipment and use become very convenient, can lay substantial amounts of test point with relatively low human cost, it is possible to record the magnitude of voltage of each time point；Simultaneously because be provided with ZigBee wireless communication module, so this device supports scope remote, wide, the wireless remote monitering function of many test points, possess the plurality of advantages such as high efficiency and intuitive, facilitate power department to grasp the running status of low-voltage network in real time, there is social benefit widely.
Accompanying drawing explanation
Fig. 1 is the systematic schematic diagram of a kind of triple channel of the present invention contactless below 1000V voltage measuring apparatus；
Fig. 2 is the composition of the tiny signal detector of a kind of triple channel of the present invention contactless below 1000V voltage measuring apparatus.
Fig. 3 is the data storage composition with output module of a kind of triple channel of the present invention contactless below 1000V voltage measuring apparatus.
Fig. 4 is sensor construction schematic diagram.
Fig. 5 is discharge circuit, the circuit diagram of difference channel.
Shown in figure it is: 1-the first metallic plate；2-wire to be measured；3-pliers；4-the second metallic plate；5-the 3rd metallic plate.
Detailed description of the invention
Being described in further detail the purpose of the present invention below by specific embodiment, embodiment can not repeat one by one at this, but the most therefore embodiments of the present invention are defined in following example.
Shown in seeing figures.1.and.2, a kind of triple channel contactless below 1000V voltage measuring apparatus, including tiny signal detector, voltage signal observer, data storage and output module, the outfan of described tiny signal detector is connected with the input of voltage signal observer, the circuit of described tiny signal detector realizes on a pcb board, and described voltage signal observer is integrated on a FPGA plate with data storage and output module.
Described tiny signal detector includes:
Sensor: as shown in Figure 4, sensor includes the first metallic plate 1 and the second metallic plate the 4, the 3rd metallic plate 5, described first metallic plate 1 is directly connected to discharge circuit input, described second metallic plate 4 pastes respectively with the 3rd metallic plate 5 that thickness is different and is connected with discharge circuit another two input after mica sheet known to dielectric constant, described first metallic plate 1 and the second metallic plate the 4, the 3rd metallic plate 5 are placed side by side on a pliers 3, it is fixed on wire 2 to be measured by pliers 3 during use, provides path for small leakage current；
Discharge circuit: for three Weak current signals of flows through sensor are amplified and are converted to voltage signal, amplifier LM324 realize；
Difference channel: the voltage signal amplified by discharge circuit is subtracted each other the external interference being jointly subjected to counteracting.It is divided into the two groups: 1st group to be subtracted each other by the voltage in the second loop, metallic plate 4 place and the 3rd loop, metallic plate 5 place；The voltage in the first loop, metallic plate 1 place and the 3rd loop, metallic plate 5 place is subtracted each other by the 2nd group；
Measuring circuit: for the difference in voltage that difference channel exports is measured and carries out analog digital conversion.
Wherein, C in figure0For equivalent capacity intrinsic between wire and sensor, C1 C2For the known capacitance on sensor, namely mica sheet.
As it is shown in figure 5, described discharge circuit, difference channel are made up of sampling resistor and subtraction circuit, described subtraction circuit is made up of operational amplifier, resistance.
With reference to Fig. 3, the storage of described data and output module are connected to ZigBee wireless communication module, USB output module, SD card memory module.
In one embodiment of the invention, a kind of triple channel contactless below 1000V voltage measuring apparatus is made up of tiny signal detector, voltage signal observer, data storage and output module.
Wherein, tiny signal detectors measure goes out the wechat current signal caused by voltage difference between wire to be measured and sensor, is amplified and calculus of differences, it is achieved analog digital conversion.And the digital signal after conversion is sent to voltage signal observer.The digital signal received is carried out data process by voltage signal observer, tries to achieve the voltage effective value in wire to be measured according to the quantitative relation computing of Weak current signal Yu voltage to be measured, and transmits data to data storage and output module.The data that voltage signal observer exports are stored in SD card by data storage and output module.
In another embodiment of the present invention, a kind of triple channel contactless below 1000V voltage measuring apparatus is made up of tiny signal detector, voltage signal observer, data storage and output module.
Wherein, tiny signal detectors measure goes out the wechat current signal caused by voltage difference between wire to be measured and sensor, is amplified and calculus of differences, it is achieved analog digital conversion.And the digital signal after conversion is sent to voltage signal observer.The digital signal received is carried out data process by voltage signal observer, tries to achieve the voltage effective value in wire to be measured according to the quantitative relation computing of Weak current signal Yu voltage to be measured, and transmits data to data storage and output module.The data that voltage signal observer exports are transferred out by data storage and output module by USB wired mode.
In another embodiment of the present invention, a kind of triple channel contactless below 1000V voltage measuring apparatus is made up of tiny signal detector, voltage signal observer, data storage and output module.
Wherein, tiny signal detectors measure goes out the wechat current signal caused by voltage difference between wire to be measured and sensor, is amplified and calculus of differences, it is achieved analog digital conversion.And the digital signal after conversion is sent to voltage signal observer.The digital signal received is carried out data process by voltage signal observer, tries to achieve the voltage effective value in wire to be measured according to the quantitative relation computing of Weak current signal Yu voltage to be measured, and transmits data to data storage and output module.The data that voltage signal observer exports are gone out by data storage and output module by Zigbee wireless way for transmitting.
Wherein, the operation principle of tiny signal detector is as follows:
The sensor comprising 3 metallic plates is fixed on wire to be measured by pliers, owing to there is voltage difference between sensor and wire to be measured, metallic plate will flow through the Weak current that the order of magnitude is μ A；The Weak current signal flow through on 3 metallic plates is amplified and is converted to voltage signal by discharge circuit；By difference channel, voltage is subtracted each other external interference again that be jointly subjected to counteracting, is divided into the two groups: 1st group to be subtracted each other by the voltage in the second loop, metallic plate place and the 3rd loop, metallic plate place；The voltage in the first loop, metallic plate place and the 3rd loop, metallic plate place is subtracted each other by the 2nd group；The last difference in voltage exported difference channel by measuring circuit measures.
The above embodiment of the present invention is only for clearly demonstrating example of the present invention, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here without also cannot all of embodiment be given exhaustive.All any amendment, equivalent and improvement etc. made within the spirit and principles in the present invention, within should be included in the protection domain of the claims in the present invention.
Claims (7)
1. triple channel contactless below a 1000V voltage measuring apparatus, it is characterised in that including:
Tiny signal detector: for the Weak current signal that amount detection level is μ A, and it is amplified and calculus of differences；
Voltage signal observer: for the voltage signal that tiny signal detector exports is carried out data process, utilizes the quantitative relation computing of Weak current and voltage to be measured to try to achieve the voltage effective value in wire to be measured；
Data storage and output module: the data that voltage signal observer exports are stored, and by the way of wired or wireless, carry out data output.
A kind of triple channel contactless below 1000V voltage measuring apparatus the most according to claim 1, it is characterised in that described tiny signal detector includes:
Sensor: include the first metallic plate and the second metallic plate, the 3rd metallic plate, described first metallic plate is directly connected to discharge circuit input, described second metallic plate and the 3rd metallic plate are connected with discharge circuit another two input after pasting mica sheet known to thickness difference and dielectric constant respectively, described first metallic plate and the second metallic plate, the 3rd metallic plate are placed side by side on a pliers, it is fixed on wire to be measured by pliers during use, provides path for small leakage current；
Discharge circuit: for three the Weak current signals flowing through described sensor are amplified and are converted to voltage signal；
Difference channel: the voltage signal amplified by discharge circuit is subtracted each other the external interference being jointly subjected to counteracting, is divided into the two groups: 1st group to be subtracted each other by the voltage in the second loop, metallic plate place and the 3rd loop, metallic plate place；The voltage in the first loop, metallic plate place and the 3rd loop, metallic plate place is subtracted each other by the 2nd group；
Measuring circuit: for the difference in voltage that difference channel exports is measured and carries out analog digital conversion.
A kind of triple channel contactless below 1000V voltage measuring apparatus the most according to claim 2, it is characterised in that: described discharge circuit uses LM324.
A kind of triple channel contactless below 1000V voltage measuring apparatus the most according to claim 2, it is characterised in that: described difference channel is made up of sampling resistor and subtraction circuit, and described subtraction circuit is made up of operational amplifier, resistance and electric capacity.
A kind of triple channel contactless below 1000V voltage measuring apparatus the most according to claim 1, it is characterised in that: the storage of described data and output module include ZigBee wireless communication module.
A kind of triple channel contactless below 1000V voltage measuring apparatus the most according to claim 1, it is characterised in that: the storage of described data and output module include USB output module.
A kind of triple channel contactless below 1000V voltage measuring apparatus the most according to claim 1, it is characterised in that: the storage of described data and output module include SD card memory module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610442430.8A CN105974188A (en) | 2016-06-16 | 2016-06-16 | Three-channel noncontact lower-than-1000V voltage measurement device |
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| CN201610442430.8A CN105974188A (en) | 2016-06-16 | 2016-06-16 | Three-channel noncontact lower-than-1000V voltage measurement device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103245824A (en) * | 2013-05-29 | 2013-08-14 | 重庆大学 | Non-contact D-dot voltage transformer and voltage detection self-correcting method thereof |
| CN103257263A (en) * | 2013-03-09 | 2013-08-21 | 西安电子科技大学 | Non-contacting-type power frequency voltage measuring device |
| CN104914296A (en) * | 2015-05-29 | 2015-09-16 | 国家电网公司 | Multifunctional clamp meter |
| CN105242102A (en) * | 2015-07-23 | 2016-01-13 | 柳州铁道职业技术学院 | Portable switch operating current curve acquisition device |
| CN205720417U (en) * | 2016-06-16 | 2016-11-23 | 华南理工大学 | A kind of triple channel contactless below 1000V voltage measuring apparatus |
-
2016
- 2016-06-16 CN CN201610442430.8A patent/CN105974188A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103257263A (en) * | 2013-03-09 | 2013-08-21 | 西安电子科技大学 | Non-contacting-type power frequency voltage measuring device |
| CN103245824A (en) * | 2013-05-29 | 2013-08-14 | 重庆大学 | Non-contact D-dot voltage transformer and voltage detection self-correcting method thereof |
| CN104914296A (en) * | 2015-05-29 | 2015-09-16 | 国家电网公司 | Multifunctional clamp meter |
| CN105242102A (en) * | 2015-07-23 | 2016-01-13 | 柳州铁道职业技术学院 | Portable switch operating current curve acquisition device |
| CN205720417U (en) * | 2016-06-16 | 2016-11-23 | 华南理工大学 | A kind of triple channel contactless below 1000V voltage measuring apparatus |
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Application publication date: 20160928 |
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