CN112485498A - Non-contact voltage measurement sensor and working method thereof - Google Patents
Non-contact voltage measurement sensor and working method thereof Download PDFInfo
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- CN112485498A CN112485498A CN202011536163.3A CN202011536163A CN112485498A CN 112485498 A CN112485498 A CN 112485498A CN 202011536163 A CN202011536163 A CN 202011536163A CN 112485498 A CN112485498 A CN 112485498A
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- 238000005259 measurement Methods 0.000 title claims abstract description 35
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- 230000006698 induction Effects 0.000 claims abstract description 43
- 239000002184 metal Substances 0.000 claims abstract description 26
- 239000004020 conductor Substances 0.000 claims abstract description 23
- 238000005070 sampling Methods 0.000 claims abstract description 23
- 230000008878 coupling Effects 0.000 claims abstract description 20
- 238000010168 coupling process Methods 0.000 claims abstract description 20
- 238000005859 coupling reaction Methods 0.000 claims abstract description 20
- 238000004891 communication Methods 0.000 claims abstract description 17
- 239000003990 capacitor Substances 0.000 claims abstract description 12
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 4
- 230000005684 electric field Effects 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 10
- 238000009434 installation Methods 0.000 claims description 5
- 238000011017 operating method Methods 0.000 claims description 4
- 230000000737 periodic effect Effects 0.000 claims description 2
- 230000003321 amplification Effects 0.000 claims 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims 2
- 230000001939 inductive effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
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- 230000007935 neutral effect Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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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
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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Abstract
The invention provides a non-contact voltage measurement sensor and a working method thereof, and the non-contact voltage measurement sensor comprises a power supply control unit, an open-close type non-contact induction ring, a ground connector, a signal amplifier, a single chip microcomputer and a wireless communication unit, wherein the power supply control unit adopts a voltage stabilizing chip to stabilize a power supply to 3.3V to supply power to a system, the open-close type non-contact induction ring and a conductor generate a coupling capacitor, the ground connector and an induction electrode form a coupling loop path, the signal amplifier receives a coupling signal and amplifies and outputs the coupling signal, the single chip microcomputer has an ADC (analog to digital converter) sampling function, and the wireless communication unit can receive data of the single chip microcomputer through a serial port and send the data to. According to the technical scheme, the voltage waveform and the voltage value of the cable are measured without directly contacting with a charged metal conductor; the induction device is opened and closed, can be deployed without power failure and is convenient to install; the accurate voltage value can be measured only by accessing the ground, and the error range can be guaranteed to be within +/-5%.
Description
Technical Field
The invention relates to the technical field of voltage monitoring, in particular to a non-contact voltage measurement sensor and a working method thereof.
Background
In the field of voltage measurement, in particular in the "220/380V voltage" class of low-voltage distribution networks, a non-contact electrically precise voltage measurement method is missing. If the ac voltage value is to be measured accurately, the conventional voltage measuring sensor needs to be connected to the lines of the ac power n (neutral wire) and the ac power l (live wire), isolated by a transformer or an isolation chip, and calculated by using a metering chip or an adc (analog Digital computer) sampling technology to obtain the measurement result. The product that adopts traditional measurement technical design must have a power failure operation when installing and deploying, is not convenient for reform transform the application of environment, and the installation that has a power failure still can lead to the user to have a power failure, and it is inconvenient to bring for the construction deployment, and the installation effectiveness is low, and user experience feels poor.
At present, relevant products for non-contact voltage measurement are available on the market, but the measurement precision of the products is very poor, only the measurement states of existence or nonexistence can be reflected, and specific applications such as voltage monitoring and energy control cannot be realized.
Disclosure of Invention
In order to make up for the defects of the prior art, the invention provides the non-contact voltage measuring sensor which can accurately measure the voltage of the cable without connecting a cable conductor.
The invention is realized by the following technical scheme: a non-contact voltage measurement sensor comprises a power supply control unit, an open-close type non-contact induction ring, a ground connector, a signal amplifier, a single chip microcomputer and a wireless communication unit, wherein the power supply control unit adopts a voltage stabilizing chip to stabilize a power supply to 3.3V to supply power to a system, the open-close type non-contact induction ring and a conductor generate a coupling capacitor, the ground connector and an induction electrode form a coupling loop circuit to realize accurate measurement of a voltage value, the signal amplifier receives a coupling signal and amplifies and outputs the coupling signal, the single chip microcomputer has an ADC (analog to digital converter) sampling function, processes the amplified output signal and outputs an accurate voltage value, and the wireless communication unit can receive data of the single chip microcomputer through a serial port and sends the data to a collection terminal in an active or passive.
As the preferred scheme, the power control unit adopts CT electricity-taking mode to charge the battery.
As a preferred scheme, the open-close type non-contact induction ring comprises a cable conductor, a metal induction sheet covers the cable conductor, when alternating current voltage is conducted on the cable conductor, an alternating current electric field is generated on one surface, facing the cable conductor, of the metal induction sheet, weak alternating current voltage signals are generated on the back surface of the metal induction sheet, the alternating current voltage signals can penetrate through a capacitor connected to the back surface of the metal induction sheet and reach a signal amplifier through the capacitor, the signal amplifier processes and amplifies the weak alternating current voltage signals, the signal amplifier outputs proper voltage values to a voltage division sampling resistor, the voltage division sampling resistor inputs the voltage division values into an ADC sampling channel of a single chip microcomputer, and the ADC sampling channel calculates accurate alternating current electric field voltage.
Further, the earth connector, the open-close type non-contact induction ring and the signal amplifier are connected to form a coupling loop path.
A working method of a non-contact voltage measurement sensor has a wireless communication function, an ID address needs to be set for the sensor through wireless debugging equipment or a debugging serial port before installation and deployment, and the ID of the sensor is bound to a collection terminal, and the working method specifically comprises the following steps:
s1: when the cable is deployed, the open-close type non-contact induction ring is clamped on a tested cable;
s2: connecting the earth wire connector with any earth in the power distribution cabinet, wherein an electric field is generated between the front surface of the metal induction sheet in the opening-closing type non-contact induction ring and a cable conductor to be tested, and a weak signal of alternating voltage can be generated on the back surface of the metal induction sheet; turning on a sensor power switch, enabling the sensor to enter initialization setting, wherein the initialization setting is carried out in a mode issued by a collection terminal, and setting parameters comprise a voltage over-range threshold value and a clock calibration instruction; the sensor adopts a working mode of timing measurement, storing measurement data and reporting at a timing; the timing measurement and the timing storage are realized by a power supply of the control signal amplifier; the timing report is controlled by the real-time clock in the single chip;
s3: during measurement, the signal amplifier processes and amplifies weak alternating voltage signals, outputs proper voltage values to an ADC sampling channel of the single chip microcomputer, outputs accurate alternating voltage values in a calculation, compensation and calibration mode, and stores the voltage values at regular time;
s4: the singlechip transmits the voltage value calculated by the ADC to the wireless communication unit;
s5: the wireless communication unit reports the voltage value to the collection terminal or other host machines, and the reporting period is reported according to a preset period.
Preferably, the tested cable in step S1 includes an outlet terminal of a circuit breaker in the power distribution cabinet.
Preferably, the timing measurement and timing storage in step S3 are preferably sampled once per minute and stored once per minute.
Preferably, the periodic reporting in step S5 is preferably performed every five minutes.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
(1) the voltage waveform data can be accurately output only by coupling and sensing an L (live wire) line and an E (earth) line without contacting with a power grid line N (neutral wire) and an L (live wire) line, and the voltage value is obtained by sampling and calculating an ADC (analog to Digital computer) of a singlechip, so that the voltage waveform and the voltage value of the cable are measured without directly contacting with a charged metal wire;
(2) the induction device is opened and closed, can be deployed without power failure and is convenient to install;
(3) adopt the electric capacity between main loop cable conductor and the response metal electrode piece to carry out signal coupling, utilize capacitor principle and shielding principle, when one face of metal sheet receives the electric field excitation, because the electron flows, can produce corresponding electric charge at another face to at the inside electric field opposite with external world that forms of metal sheet, utilize the principle that these two electric fields can be balanced each other to realize measuring voltage, only need insert the earth and can measure accurate voltage value, error range can guarantee within 5%.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block diagram of the system elements of the present invention;
FIG. 2 is a voltage measurement schematic of the present invention;
fig. 3 is a diagram of the working process of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein, and thus the scope of the present invention is not limited by the specific embodiments disclosed below.
The non-contact voltage measuring sensor and the operating method thereof according to the embodiment of the present invention will be described in detail with reference to fig. 1 to 3.
As shown in fig. 1 and 2, the invention provides a non-contact voltage measurement sensor, which comprises a power supply control unit, an open-close type non-contact induction ring, a ground connector, a signal amplifier, a single chip microcomputer and a wireless communication unit, wherein the power supply control unit adopts a voltage stabilizing chip to stabilize a power supply to 3.3V to supply power to a system, and the power supply control unit adopts a CT power taking mode to charge a battery. The open-close type non-contact induction ring and the conductor generate a coupling capacitor, the earth connector and the induction electrode form a coupling loop circuit, the voltage value is accurately measured, the signal amplifier receives the coupling signal and amplifies and outputs the coupling signal, the single chip microcomputer has an ADC (analog to digital converter) sampling function, processes the amplified output signal and outputs the accurate voltage value, and the wireless communication unit can receive data of the single chip microcomputer through a serial port and sends the data to the collection terminal in an active or passive reporting mode. The open-close type non-contact induction ring comprises a cable conductor, a metal induction sheet is covered outside the cable conductor, when the cable conductor is communicated with alternating current voltage, an alternating current electric field is generated by the metal induction sheet towards one side of the cable conductor, weak alternating current voltage signals are generated on the back side of the metal induction sheet, the alternating current voltage signals can pass through a capacitor connected to the back side of the metal induction sheet and reach a signal amplifier through the capacitor, the signal amplifier processes and amplifies the weak alternating current voltage signals, the signal amplifier outputs proper voltage values to a voltage division sampling resistor, the voltage division sampling resistor inputs the voltage division values into an ADC sampling channel of a single chip microcomputer, and the ADC sampling channel calculates the accurate alternating current electric field voltage. The earth connector is connected with the open-close type non-contact induction ring and the signal amplifier to form a coupling loop path. Adopt the electric capacity between main loop cable conductor and the response metal electrode piece to carry out signal coupling, utilize capacitor principle and shielding principle, when one face of metal sheet receives the electric field excitation, because electron flows, can produce corresponding electric charge at another face to at the inside electric field opposite with external world that forms of metal sheet, utilize the principle that these two electric fields can be balanced each other to realize measuring voltage.
A working method of a non-contact voltage measurement sensor has a wireless communication function, an ID address needs to be set for the sensor through wireless debugging equipment or a debugging serial port before installation and deployment, and the ID of the sensor is bound to a collection terminal, and the working method specifically comprises the following steps:
s1: when the cable is deployed, the open-close type non-contact induction ring is clamped on a tested cable, and the tested cable comprises a wire outlet end of a circuit breaker in the power distribution cabinet.
S2: connecting the earth wire connector with any earth in the power distribution cabinet, wherein an electric field is generated between the front surface of the metal induction sheet in the opening-closing type non-contact induction ring and a cable conductor to be tested, and a weak signal of alternating voltage can be generated on the back surface of the metal induction sheet; turning on a sensor power switch, enabling the sensor to enter initialization setting, wherein the initialization setting is carried out in a mode issued by a collection terminal, and setting parameters comprise a voltage over-range threshold value and a clock calibration instruction; the sensor adopts a working mode of timing measurement, storing measurement data and reporting at a timing; the timing measurement and the timing storage are realized by a power supply of the control signal amplifier; the timing report is controlled by the real-time clock in the single chip.
S3: during measurement, the signal amplifier processes and amplifies weak alternating voltage signals, outputs proper voltage values to an ADC sampling channel of the single chip microcomputer, outputs accurate alternating voltage values in a calculation, compensation and calibration mode, and stores the voltage values at regular time, once every minute for sampling and once every minute for storing.
S4: the singlechip transmits the voltage value calculated by the ADC to the wireless communication unit.
S5: the wireless communication unit reports the voltage value to the collection terminal or other host computers, and the reporting period is reported according to a preset period and is reported every five minutes.
In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically limited, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A non-contact voltage measurement sensor comprises a power supply control unit, an open-close type non-contact induction ring, a ground connector, a signal amplifier, a single chip microcomputer and a wireless communication unit, and is characterized in that the power supply control unit adopts a voltage stabilizing chip to stabilize a power supply to 3.3V to supply power to a system, the open-close type non-contact induction ring and a conductor generate a coupling capacitor, the ground connector and an induction electrode form a coupling loop circuit to achieve accurate voltage value measurement, the signal amplifier receives a coupling signal and performs amplification output, the single chip microcomputer has an ADC (analog to digital converter) sampling function, processes the amplification output signal and outputs an accurate voltage value, and the wireless communication unit can receive data of the single chip microcomputer through a serial port and sends the data to a collection terminal in an active or passive reporting mode.
2. The non-contact voltage measuring sensor according to claim 1, wherein the power control unit charges the battery by using a CT power supply.
3. The non-contact voltage measurement sensor according to claim 1, wherein the open-close type non-contact induction loop comprises a cable conductor, a metal induction sheet is covered outside the cable conductor, when the cable conductor is supplied with an alternating current voltage, an alternating current electric field is generated on one side of the metal induction sheet facing the cable conductor, a weak alternating current voltage signal is generated on the back side of the metal induction sheet, the alternating current voltage signal can pass through a capacitor connected to the back side of the metal induction sheet and reach a signal amplifier through the capacitor, the signal amplifier processes and amplifies the weak alternating current voltage signal, the signal amplifier outputs an appropriate voltage value to a voltage division sampling resistor, the voltage division sampling resistor inputs the voltage division value into an ADC sampling channel of the single chip microcomputer, and the ADC sampling channel calculates the accurate alternating current electric field voltage.
4. A contactless voltage measuring sensor according to claim 3, wherein the earth connector forms a coupled loop path with the open-close contactless inductive loop and the signal amplifier.
5. The working method of the non-contact voltage measurement sensor according to claims 1-4, wherein the sensor has a wireless communication function, an ID address is set for the sensor through a wireless debugging device or a debugging serial port before installation and deployment, and the ID of the sensor is bound to a sink terminal, and specifically comprises the following steps:
s1: when the cable is deployed, the open-close type non-contact induction ring is clamped on a tested cable;
s2: connecting the earth wire connector with any earth in the power distribution cabinet, wherein an electric field is generated between the front surface of the metal induction sheet in the opening-closing type non-contact induction ring and a cable conductor to be tested, and a weak signal of alternating voltage can be generated on the back surface of the metal induction sheet;
turning on a sensor power switch, enabling the sensor to enter initialization setting, wherein the initialization setting is carried out in a mode issued by a collection terminal, and setting parameters comprise a voltage over-range threshold value and a clock calibration instruction; the sensor adopts a working mode of timing measurement, storing measurement data and reporting at a timing; the timing measurement and the timing storage are realized by a power supply of the control signal amplifier; the timing report is controlled by the real-time clock in the single chip;
s3: during measurement, the signal amplifier processes and amplifies weak alternating voltage signals, outputs proper voltage values to an ADC sampling channel of the single chip microcomputer, outputs accurate alternating voltage values in a calculation, compensation and calibration mode, and stores the voltage values at regular time;
step 4, the singlechip transmits the voltage value calculated by the ADC to the wireless communication unit;
and step 5, the wireless communication unit reports the voltage value to the collection terminal or other hosts, and the reporting period is reported according to a preset period.
6. The operating method of the non-contact voltage measuring sensor according to claim 5, wherein the cable to be measured in step S1 includes an outlet terminal of a circuit breaker in a power distribution cabinet.
7. The operating method of a non-contact voltage measuring sensor according to claim 5, wherein the timing measurement and timing storage in step S3 are preferably sampling once per minute and storing once per minute.
8. The operating method of a non-contact voltage measuring sensor according to claim 5, wherein the periodic reporting in step S5 is preferably performed every five minutes.
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Cited By (3)
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| CN113219240A (en) * | 2021-05-28 | 2021-08-06 | 北京中科飞龙传感技术有限责任公司 | Non-invasive cable voltage measurement sensor |
| CN113238093A (en) * | 2021-06-11 | 2021-08-10 | 广西电网有限责任公司电力科学研究院 | Non-contact voltage measuring method, non-contact voltage measuring device, computer equipment and storage medium |
| CN113848367A (en) * | 2021-09-22 | 2021-12-28 | 温州大学乐清工业研究院 | Self-adaptive dynamic compensation method and device for non-contact voltage measurement |
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