CN110297124A - A kind of ungrounded formula voltage measuring apparatus and method - Google Patents
A kind of ungrounded formula voltage measuring apparatus and method Download PDFInfo
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- CN110297124A CN110297124A CN201910721658.4A CN201910721658A CN110297124A CN 110297124 A CN110297124 A CN 110297124A CN 201910721658 A CN201910721658 A CN 201910721658A CN 110297124 A CN110297124 A CN 110297124A
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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)
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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
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
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Abstract
The invention discloses a kind of ungrounded formula voltage measuring apparatus and methods, by way of placing metal plate between in conducting wire to be measured and virtually, corresponding relationship will be established between the equivalent capacity of the voltage of conducting wire to be measured and metal plate to conducting wire to be measured and virtually, then modulate the voltage signal for characterizing its corresponding relationship by high-frequency signal and extrapolates the voltage of conducting wire to be measured after scaling down processing.As it can be seen that the measuring device of the application using virtually carry out voltage measurement calculating, without carrying out insulating Design；Moreover, the measuring device of the application is using device, less, small volume, handling simplicity, working security are higher, so as to meet the growth requirement of smart grid.
Description
Technical field
The present invention relates to power measurement technical fields, more particularly to a kind of ungrounded formula voltage measuring apparatus and method.
Background technique
Voltage signal parameter is the key parameter of metering, fault detection, relay protection in electric system.Currently, in electric power
In system, generally use ground-type potential transformer (such as electromagnetic potential transformer, capacitance type potential transformer) by voltage every
From and be reduced to the low pressure range that can directly measure, voltage parameter is then obtained by measuring device.But traditional electromagnetic type
Voltage transformer and capacitance type potential transformer all have the disadvantages of volume is big and insulation system is complicated, are gradually difficult to adapt to intelligence
The growth requirement of power grid.
Therefore, how to provide a kind of scheme of solution above-mentioned technical problem is that those skilled in the art needs to solve at present
The problem of.
Summary of the invention
The object of the present invention is to provide a kind of ungrounded formula voltage measuring apparatus and methods, electric using virtually carrying out
Survey calculation is pressed, without carrying out insulating Design；Moreover, the measuring device of the application is using device, less, small volume, handling are simple
Just, working security is higher, so as to meet the growth requirement of smart grid.
In order to solve the above technical problems, the present invention provides a kind of ungrounded formula voltage measuring apparatus, comprising:
Be placed in conducting wire to be measured and virtually between metal plate, for by the first voltage signal of the conducting wire to be measured turn
It is changed to and characterizes the metal plate to the second voltage signal of the conducting wire to be measured and the equivalent capacitance value virtually；
Signal processing circuit, for the second voltage signal and high-frequency excitation signal to be modulated simultaneously scaling down processing,
Obtain characterizing the first frequency signal of the corresponding relationship of the high-frequency excitation signal and the equivalent capacitance value, and characterization described the
The second frequency signal of one voltage signal and the corresponding relationship of the equivalent capacitance value；
Control module, for obtaining the equivalent capacity according to the first frequency signal and the high-frequency excitation signal
Value, and the first voltage signal is obtained according to the second frequency signal and the equivalent capacitance value.
Preferably, the signal processing circuit includes operational amplifier, capacitor, subtracter and frequency division module；Wherein:
The input anode of the operational amplifier accesses the high-frequency excitation signal, the input negative terminal of the operational amplifier
Connect respectively with the first end of the metal plate and the capacitor, the second end of the capacitor respectively with the operational amplifier
Output end is connected with the input negative terminal of the subtracter, and the input anode of the subtracter accesses the high-frequency excitation signal；
The modulated signal that the frequency division module is used to export the subtracter carries out scaling down processing, obtains characterizing the height
The first frequency signal of the corresponding relationship of frequency pumping signal and the equivalent capacitance value, and the characterization first voltage signal and institute
State the second frequency signal of the corresponding relationship of equivalent capacitance value.
Preferably, the frequency division module includes:
The first filter being connect with the output end of the subtracter, modulated signal for exporting the subtracter into
Row filtering processing, obtains the first frequency signal for characterizing the corresponding relationship of the high-frequency excitation signal and the equivalent capacitance value；
The second filter being connect with the output end of the subtracter, modulated signal for exporting the subtracter into
Row filtering processing, obtains the second frequency signal for characterizing the corresponding relationship of the first voltage signal and the equivalent capacitance value.
Preferably, the control module includes:
The A/D converter being connect respectively with the output end of the first filter and the second filter, for distinguishing
The first frequency signal and the second frequency signal are subjected to analog-to-digital conversion, obtain first frequency digital signal and the second frequency
Rate digital signal；
The controller being connect with the output end of the A/D converter, for according to the first frequency digital signal and institute
The digital signal for stating high-frequency excitation signal seeks the equivalent capacitance value, and according to the second frequency digital signal and described etc.
Effect capacitance seeks the signal amplitude of the first voltage signal.
Preferably, the frequency division module is integrated in the control module；
Correspondingly, the control module includes:
The A/D converter being connect with the output end of the subtracter, modulated signal for exporting the subtracter into
Row analog-to-digital conversion, obtains modulated digital signal；
The controller being connect with the output end of the A/D converter, for utilizing pre-stored frequency dividing program by the tune
Digital signal processed carries out scaling down processing, obtains the of the corresponding relationship for characterizing the high-frequency excitation signal and the equivalent capacitance value
One rate digital signal, and characterize the second frequency number of the corresponding relationship of the first voltage signal and the equivalent capacitance value
Signal；The equivalent capacitance value is sought according to the digital signal of the first frequency digital signal and the high-frequency excitation signal,
And the signal amplitude of the first voltage signal is sought according to the second frequency digital signal and the equivalent capacitance value.
Preferably, the ungrounded formula voltage measuring apparatus further include:
The wireless transport module being connect with the controller；The controller is also used to the letter of the first voltage signal
Number amplitude is transmitted to remote terminal equipment through the wireless transport module.
Preferably, the wireless transport module is specially bluetooth module.
Preferably, the ungrounded formula voltage measuring apparatus further include:
The memory being connect with the controller；The controller is also used to the signal amplitude of the first voltage signal
It stores to the memory.
In order to solve the above technical problems, the present invention also provides a kind of ungrounded formula voltage measurement methods, comprising:
Using be placed in conducting wire to be measured and virtually between metal plate, by the first voltage signal of the conducting wire to be measured turn
It is changed to and characterizes the metal plate to the second voltage signal of the conducting wire to be measured and the equivalent capacitance value virtually；
The second voltage signal and high-frequency excitation signal are modulated and scaling down processing, obtains characterizing the high frequency and swash
Encourage the first frequency signal of the corresponding relationship of signal and the equivalent capacitance value, and the characterization first voltage signal and described etc.
Imitate the second frequency signal of the corresponding relationship of capacitance；
The equivalent capacitance value is obtained according to the first frequency signal and the high-frequency excitation signal, and according to described
Two frequency signals and the equivalent capacitance value obtain the first voltage signal.
The present invention provides a kind of ungrounded formula voltage measuring apparatus, by placing gold between in conducting wire to be measured and virtually
The mode for belonging to plate, by the corresponding pass of foundations between the equivalent capacity of the voltage of conducting wire to be measured and metal plate to conducting wire to be measured and virtually
Then the voltage signal for characterizing its corresponding relationship is modulated by high-frequency signal and extrapolates conducting wire to be measured after scaling down processing by system
Voltage.As it can be seen that the measuring device of the application using virtually carry out voltage measurement calculating, without carrying out insulating Design；And
And less, small volume, handling simplicity, working security are higher using device for the measuring device of the application, so as to meet intelligence
The growth requirement of energy power grid.
The present invention also provides a kind of ungrounded formula voltage measurement methods, having the same beneficial to effect with above-mentioned measuring device
Fruit.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to institute in the prior art and embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram of ungrounded formula voltage measuring apparatus provided in an embodiment of the present invention；
Fig. 2 is a kind of concrete structure schematic diagram of ungrounded formula voltage measuring apparatus provided in an embodiment of the present invention；
Fig. 3 is the concrete structure schematic diagram of the ungrounded formula voltage measuring apparatus of another kind provided in an embodiment of the present invention；
Fig. 4 is a kind of flow chart of ungrounded formula voltage measurement method provided in an embodiment of the present invention.
Specific embodiment
Core of the invention is to provide a kind of ungrounded formula voltage measuring apparatus and method, using virtually carrying out electricity
Survey calculation is pressed, without carrying out insulating Design；Moreover, the measuring device of the application is using device, less, small volume, handling are simple
Just, working security is higher, so as to meet the growth requirement of smart grid.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Fig. 1 is please referred to, Fig. 1 is a kind of structural representation of ungrounded formula voltage measuring apparatus provided in an embodiment of the present invention
Figure.
The ungrounded formula voltage measuring apparatus includes:
Be placed in conducting wire to be measured and virtually between metal plate 1, for the first voltage signal of conducting wire to be measured to be converted
For the second voltage signal of the equivalent capacitance value of characterization metal plate 1 to conducting wire to be measured and virtually；
Signal processing circuit 2 is obtained for second voltage signal and high-frequency excitation signal to be modulated simultaneously scaling down processing
Characterize the first frequency signal of the corresponding relationship of high-frequency excitation signal and equivalent capacitance value, and characterization first voltage signal and equivalent
The second frequency signal of the corresponding relationship of capacitance；
Control module 3, for obtaining equivalent capacitance value according to first frequency signal and high-frequency excitation signal, and according to second
Frequency signal and equivalent capacitance value obtain first voltage signal.
Specifically, the ungrounded formula voltage measuring apparatus of the application includes metal plate 1, signal processing circuit 2 and control mould
Block 3, its working principle is that:
As shown in Figure 1, in conducting wire to be measured and virtually (node of reference potential is kept constant in circuit, it is not direct
Be connected to practically) between place a metal plate 1, then metal plate 1 is C to the equivalent capacitance value of conducting wire to be measured2, metal plate 1
It is C to equivalent capacitance value virtuallyp.If the signal amplitude of the first voltage signal of conducting wire to be measured is VL, then the application is with to be measured
When the current potential of conducting wire is with reference to ground, current potential virtually is-VL.As can be seen that metal plate 1 on second voltage signal with it is to be measured
The equivalent capacitance value of the first voltage signal and metal plate 1 of conducting wire to conducting wire to be measured and virtually has certain variable relation.
The second voltage signal of metal plate 1 is input in signal processing circuit 2, and signal processing circuit 2 is first by the second electricity
Pressing signal, (for the frequency of first voltage signal in Hz magnitude, the frequency of high-frequency excitation signal is in MHz magnitude with high-frequency excitation signal；
The amplitude of first voltage signal is in kV magnitude, and the amplitude of high-frequency excitation signal is in V magnitude) it is modulated, obtain modulated signal；So
Modulated signal is carried out scaling down processing afterwards, and (high-frequency signal+low frequency signal divides two-way to export, and exports high-frequency signal all the way, defeated all the way
Low frequency signal out), it is therefore an objective to the first frequency signal of the corresponding relationship of characterization high-frequency excitation signal and equivalent capacitance value is obtained, and
Characterize the second frequency signal of the corresponding relationship of first voltage signal and equivalent capacitance value.
First frequency signal and second frequency signal (known quantity) are input in control module 3 by signal processing circuit 2, control
Molding block 3 is according to first frequency signal (corresponding relationship of characterization high-frequency excitation signal and equivalent capacitance value) and high-frequency excitation signal
Equivalent capacitance value can be obtained in (known quantity), then according to second frequency signal (characterization first voltage signal and equivalent capacitance value
Corresponding relationship) and equivalent capacitance value (known quantity) can be obtained first voltage signal to get arrive conducting wire to be measured voltage magnitude VL。
The present invention provides a kind of ungrounded formula voltage measuring apparatus, by placing gold between in conducting wire to be measured and virtually
The mode for belonging to plate, by the corresponding pass of foundations between the equivalent capacity of the voltage of conducting wire to be measured and metal plate to conducting wire to be measured and virtually
Then the voltage signal for characterizing its corresponding relationship is modulated by high-frequency signal and extrapolates conducting wire to be measured after scaling down processing by system
Voltage.As it can be seen that the measuring device of the application using virtually carry out voltage measurement calculating, without carrying out insulating Design；And
And less, small volume, handling simplicity, working security are higher using device for the measuring device of the application, so as to meet intelligence
The growth requirement of energy power grid.
On the basis of the above embodiments:
Referring to figure 2., Fig. 2 is that a kind of specific structure of ungrounded formula voltage measuring apparatus provided in an embodiment of the present invention shows
It is intended to.
As a kind of optionally embodiment, signal processing circuit 2 include operational amplifier 21, capacitor 22, subtracter 23 and
Frequency division module 24；Wherein:
The input anode of operational amplifier 21 accesses high-frequency excitation signal, the input negative terminal of operational amplifier 21 respectively with gold
Belong to plate 1 connected with the first end of capacitor 22, the second end of capacitor 22 respectively with the output end of operational amplifier 21 and subtracter 23
Input negative terminal connection, the input anode of subtracter 23 accesses high-frequency excitation signal；
The modulated signal that frequency division module 24 is used to export subtracter 23 carries out scaling down processing, obtains characterization high frequency pumping letter
Number and equivalent capacitance value corresponding relationship first frequency signal, and characterization first voltage signal and the corresponding of equivalent capacitance value close
The second frequency signal of system.
Specifically, the signal processing circuit 2 of the application includes operational amplifier 21, capacitor 22, subtracter 23 and frequency dividing mould
Block 24, its working principle is that:
Apply high-frequency excitation signal V in the in-phase end of operational amplifier 21H, it is calculated in Laplace domain, utilizes fortune
The ratio enlargement principle of amplifier 21 is calculated, then M point voltage VMAre as follows:
Wherein, VL' it is first voltage signal, VL'=VLCos (At), it is to be measured
Power frequency component, i.e. A=50Hz, C are transmitted on conducting wiresFor the capacitance of capacitor 22.
Due to high-frequency excitation signal VHFor known quantity, so simplify operation using subtracter 23 in circuit, then N point voltage
VNAre as follows:
In view of the amplitude of first voltage signal is in kV magnitude, the amplitude of high-frequency excitation signal is in V magnitude, then VL' > >
VH, and metal plate 1 is to the equivalent capacitance value C of conducting wire to be measured2In pF magnitude, Cs> > C2, soVery little can be ignored,
Then N point voltage simplifies are as follows:
As can be seen that the signal that subtracter 23 exports is the high-frequency signal that above-described embodiment refers to+ low frequency signalModulated signal.
The modulated signal that subtracter 23 exports is input in frequency division module 24, and frequency division module 24 divides modulated signal
Processing obtains the first frequency signal of the corresponding relationship of characterization high-frequency excitation signal and equivalent capacitance valueWith characterization the
The second frequency signal of one voltage signal and the corresponding relationship of equivalent capacitance value
As one kind, optionally embodiment, frequency division module 24 include:
The first filter connecting with the output end of subtracter 23, the modulated signal for exporting subtracter 23 are filtered
Wave processing, obtains the first frequency signal of the corresponding relationship of characterization high-frequency excitation signal and equivalent capacitance value；
The second filter connecting with the output end of subtracter 23, the modulated signal for exporting subtracter 23 are filtered
Wave processing, obtains the second frequency signal of the corresponding relationship of characterization first voltage signal and equivalent capacitance value.
Specifically, hardware configuration realization, the specific filtering principle for using filter can be used in the frequency division module 24 of the application
(effectively filtering out the frequency other than the frequency point of specific frequency, obtain the signal of a specific frequency) realizes signal frequency split.
More specifically, the application determines first frequency signal (high-frequency signal) and second frequency letter in modulated signal in advance
The frequency range of number (low frequency signal), then isolates first using the first filter for filtering out low frequency signal reserved high-frequency signal
Frequency signal, and second frequency signal is isolated using the second filter for filtering out high-frequency signal reservation low frequency signal.
As one kind, optionally embodiment, control module 3 include:
The A/D converter 31 being connect respectively with the output end of first filter and second filter, for respectively by first
Frequency signal and second frequency signal carry out analog-to-digital conversion, obtain first frequency digital signal and second frequency digital signal；
The controller 32 being connect with the output end of A/D converter 31, for being swashed according to first frequency digital signal and high frequency
The digital signal for encouraging signal seeks equivalent capacitance value, and seeks first voltage according to second frequency digital signal and equivalent capacitance value
The signal amplitude of signal.
Specifically, the control module 3 of the application includes A/D (analog/digital) converter 31 and controller 32, and work is former
Reason are as follows:
First frequency signal is input in A/D converter 31 by first filter, and A/D converter 31 is by first frequency signal
Analog-to-digital conversion is carried out, first frequency digital signal is obtained, then first frequency digital signal is input in controller 32.Together
Second frequency signal is input in A/D converter 31 by reason, second filter, and A/D converter 31 carries out second frequency signal
Analog-to-digital conversion obtains second frequency digital signal, and then second frequency digital signal is input in controller 32.
Controller 32 is according to first frequency digital signal (corresponding relationship of characterization high-frequency excitation signal and equivalent capacitance value)
Equivalent capacitance value can be obtained with the digital signal (known quantity) of high-frequency excitation signal, then according to second frequency digital signal (table
Levy first voltage signal and equivalent capacitance value corresponding relationship) and equivalent capacitance value (known quantity) first voltage signal can be obtained
Signal amplitude VL。
Referring to figure 3., Fig. 3 is the specific structure of the ungrounded formula voltage measuring apparatus of another kind provided in an embodiment of the present invention
Schematic diagram.
As one kind, optionally embodiment, frequency division module 24 are integrated in control module 3；
Correspondingly, control module 3 includes:
The A/D converter 31 connecting with the output end of subtracter 23, the modulated signal for exporting subtracter 23 carry out
Analog-to-digital conversion obtains modulated digital signal；
The controller 32 being connect with the output end of A/D converter 31, for number will to be modulated using pre-stored frequency dividing program
Word signal carries out scaling down processing, obtains the first frequency number letter of the corresponding relationship of characterization high-frequency excitation signal and equivalent capacitance value
Number, and the second frequency digital signal of characterization first voltage signal and the corresponding relationship of equivalent capacitance value；According to first frequency number
The digital signal of word signal and high-frequency excitation signal seeks equivalent capacitance value, and according to second frequency digital signal and equivalent capacity
Value seeks the signal amplitude of first voltage signal.
Specifically, the frequency division module 24 of the application may be used also in addition to being realized mentioned by above-described embodiment using hardware configuration
To be realized using software program, specifically frequency division module 24 is integrated in control module 3, i.e., control module 3 is with signal point
Frequency function.
More specifically, the modulated signal that subtracter 23 exports is directly inputted into the A/D converter 31, A/D in control module 3
Modulated signal is carried out analog-to-digital conversion by converter 31, obtains modulated digital signal (first frequency digital signal+second frequency number
Signal), modulated digital signal is then input to controller 32.Controller 32 will be modulated first with pre-stored frequency dividing program
Digital signal carries out scaling down processing, first frequency digital signal and second frequency digital signal is obtained, then according to first frequency
Digital signal and the digital signal of high-frequency excitation signal can be obtained equivalent capacitance value, and according to second frequency digital signal and equivalent
The signal amplitude V of first voltage signal can be obtained in capacitanceL。
Further, the controller 32 of the application can be selected but be not limited only to MCU (Micro Control Unit, micro-control
Unit processed), the application is not particularly limited herein.In addition, the high-frequency excitation signal of the application can be generated by controller 32.
As a kind of optionally embodiment, ungrounded formula voltage measuring apparatus further include:
The wireless transport module being connect with controller 32；Controller 32 is also used to pass through the signal amplitude of first voltage signal
Wireless transport module is transmitted to remote terminal equipment.
Further, the measuring device of the application may also include wireless transport module, under the assistance of wireless transport module,
The signal amplitude of first voltage signal can be wirelessly transmitted to remote terminal equipment by controller 32, to make user can be from long-range end
The signal amplitude of first voltage signal is checked in end equipment.
As one kind, optionally embodiment, wireless transport module are specially bluetooth module.
Specifically, the wireless transport module of the application can be selected but be not limited only to bluetooth module (such as WiFi module), this Shen
Be not particularly limited herein please, according to the actual situation depending on.
As a kind of optionally embodiment, ungrounded formula voltage measuring apparatus further include:
The memory being connect with controller 32；Controller 32 is also used to store the signal amplitude of first voltage signal to depositing
Reservoir.
Further, the measuring device of the application may also include memory, for storing the signal width of first voltage signal
Value, is checked to read for user's later period.
In addition, the measuring device of the application can be powered by external power supply, interior power supply module can also be set, be signal processing circuit
2, A/D converter 31 and controller 32 provide energy supply.
Referring to figure 4., Fig. 4 is a kind of flow chart of ungrounded formula voltage measurement method provided in an embodiment of the present invention.
The ungrounded formula voltage measurement method includes:
Step S1: using be placed in conducting wire to be measured and virtually between metal plate, the first voltage of conducting wire to be measured is believed
Number be converted to the second voltage signal of the equivalent capacitance value of characterization metal plate to conducting wire to be measured and virtually；
Step S2: being modulated simultaneously scaling down processing for second voltage signal and high-frequency excitation signal, obtains characterization high frequency and swashs
Encourage the first frequency signal of the corresponding relationship of signal and equivalent capacitance value, and pair of characterization first voltage signal and equivalent capacitance value
The second frequency signal that should be related to；
Step S3: equivalent capacitance value is obtained according to first frequency signal and high-frequency excitation signal, and is believed according to second frequency
Number and equivalent capacitance value obtain first voltage signal.
The introduction of measurement method provided by the present application please refers to the embodiment of above-mentioned measuring device, and the application is no longer superfluous herein
It states.
It should also be noted that, in the present specification, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (9)
1. a kind of ungrounded formula voltage measuring apparatus characterized by comprising
Be placed in conducting wire to be measured and virtually between metal plate, for the first voltage signal of the conducting wire to be measured to be converted to
The metal plate is characterized to the second voltage signal of the conducting wire to be measured and the equivalent capacitance value virtually；
Signal processing circuit is obtained for the second voltage signal and high-frequency excitation signal to be modulated simultaneously scaling down processing
Characterize the first frequency signal of the corresponding relationship of the high-frequency excitation signal and the equivalent capacitance value, and characterization first electricity
Press the second frequency signal of the corresponding relationship of signal and the equivalent capacitance value；
Control module, for obtaining the equivalent capacitance value according to the first frequency signal and the high-frequency excitation signal, and
The first voltage signal is obtained according to the second frequency signal and the equivalent capacitance value.
2. ungrounded formula voltage measuring apparatus as described in claim 1, which is characterized in that the signal processing circuit includes fortune
Calculate amplifier, capacitor, subtracter and frequency division module；Wherein:
The input anode of the operational amplifier accesses the high-frequency excitation signal, the input negative terminal difference of the operational amplifier
It is connect with the first end of the metal plate and the capacitor, the output with the operational amplifier respectively of the second end of the capacitor
End is connected with the input negative terminal of the subtracter, and the input anode of the subtracter accesses the high-frequency excitation signal；
The modulated signal that the frequency division module is used to export the subtracter carries out scaling down processing, obtains characterizing the high frequency and swash
Encourage the first frequency signal of the corresponding relationship of signal and the equivalent capacitance value, and the characterization first voltage signal and described etc.
Imitate the second frequency signal of the corresponding relationship of capacitance.
3. ungrounded formula voltage measuring apparatus as claimed in claim 2, which is characterized in that the frequency division module includes:
The first filter connecting with the output end of the subtracter, the modulated signal for exporting the subtracter are filtered
Wave processing, obtains the first frequency signal for characterizing the corresponding relationship of the high-frequency excitation signal and the equivalent capacitance value；
The second filter connecting with the output end of the subtracter, the modulated signal for exporting the subtracter are filtered
Wave processing, obtains the second frequency signal for characterizing the corresponding relationship of the first voltage signal and the equivalent capacitance value.
4. ungrounded formula voltage measuring apparatus as claimed in claim 3, which is characterized in that the control module includes:
The A/D converter being connect respectively with the output end of the first filter and the second filter, for respectively by institute
It states first frequency signal and the second frequency signal carries out analog-to-digital conversion, obtain first frequency digital signal and second frequency number
Word signal；
The controller being connect with the output end of the A/D converter, for according to the first frequency digital signal and the height
The digital signal of frequency pumping signal seeks the equivalent capacitance value, and according to the second frequency digital signal and the equivalent electricity
Capacitance seeks the signal amplitude of the first voltage signal.
5. ungrounded formula voltage measuring apparatus as claimed in claim 2, which is characterized in that the frequency division module is integrated in described
In control module；
Correspondingly, the control module includes:
The A/D converter connecting with the output end of the subtracter, the modulated signal for exporting the subtracter carry out mould
Number conversion, obtains modulated digital signal；
The controller being connect with the output end of the A/D converter, for utilizing pre-stored frequency dividing program by the modulation number
Word signal carries out scaling down processing, obtains the first frequency for characterizing the corresponding relationship of the high-frequency excitation signal and the equivalent capacitance value
Rate digital signal, and characterize the second frequency number letter of the corresponding relationship of the first voltage signal and the equivalent capacitance value
Number；The equivalent capacitance value is sought according to the digital signal of the first frequency digital signal and the high-frequency excitation signal, and
The signal amplitude of the first voltage signal is sought according to the second frequency digital signal and the equivalent capacitance value.
6. such as the described in any item ungrounded formula voltage measuring apparatus of claim 4-5, which is characterized in that the ungrounded formula electricity
Pressure measuring device further include:
The wireless transport module being connect with the controller；The controller is also used to the signal width of the first voltage signal
Value is transmitted to remote terminal equipment through the wireless transport module.
7. ungrounded formula voltage measuring apparatus as claimed in claim 6, which is characterized in that the wireless transport module is specially
Bluetooth module.
8. ungrounded formula voltage measuring apparatus as claimed in claim 6, which is characterized in that the ungrounded formula voltage measurement dress
It sets further include:
The memory being connect with the controller；The controller is also used to store the signal amplitude of the first voltage signal
To the memory.
9. a kind of ungrounded formula voltage measurement method characterized by comprising
Using be placed in conducting wire to be measured and virtually between metal plate, the first voltage signal of the conducting wire to be measured is converted to
The metal plate is characterized to the second voltage signal of the conducting wire to be measured and the equivalent capacitance value virtually；
The second voltage signal and high-frequency excitation signal are modulated simultaneously scaling down processing, obtain characterizing the high frequency pumping letter
Number and the equivalent capacitance value corresponding relationship first frequency signal, and characterize the first voltage signal and the equivalent electricity
The second frequency signal of the corresponding relationship of capacitance；
The equivalent capacitance value is obtained according to the first frequency signal and the high-frequency excitation signal, and according to second frequency
Rate signal and the equivalent capacitance value obtain the first voltage signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910721658.4A CN110297124B (en) | 2019-08-06 | 2019-08-06 | Non-grounded voltage measuring device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910721658.4A CN110297124B (en) | 2019-08-06 | 2019-08-06 | Non-grounded voltage measuring device and method |
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| CN110297124A true CN110297124A (en) | 2019-10-01 |
| CN110297124B CN110297124B (en) | 2022-04-12 |
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Citations (9)
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| US5450007A (en) * | 1991-09-19 | 1995-09-12 | Ampy Automation-Digilog Limited | Method and apparatus for power measuring |
| GB2285692A (en) * | 1993-03-13 | 1995-07-19 | Ampy Automation Digilog | Power meters |
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| CN110297124B (en) | 2022-04-12 |
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