CN110426614A - A kind of ultrasonic partial discharge sensor of high-precision signal frequency down circuit design - Google Patents
A kind of ultrasonic partial discharge sensor of high-precision signal frequency down circuit design Download PDFInfo
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- CN110426614A CN110426614A CN201910802730.6A CN201910802730A CN110426614A CN 110426614 A CN110426614 A CN 110426614A CN 201910802730 A CN201910802730 A CN 201910802730A CN 110426614 A CN110426614 A CN 110426614A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1209—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using acoustic measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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Abstract
The invention discloses a kind of ultrasonic partial discharge sensors of high-precision signal frequency down circuit design, including high-precision signal frequency down circuit, the high-precision signal frequency down circuit includes the detecting circuit and filter circuit being electrically connected, the detecting circuit includes first resistor R1, second resistance R2,3rd resistor R3, first diode D1, the second diode D2, first capacitor C1 and the second capacitor C2；The filter circuit includes the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, third capacitor C3, the 4th capacitor C4, the 5th capacitor C5 and operational amplifier A.The ultrasonic partial discharge sensor of high-precision signal frequency down circuit design provided by the invention, with high-precision special signal frequency down circuit, circuit structure is simple, takes into account small signal and big signal processing, can largely improve the detection accuracy and detection sensitivity of shelf depreciation.
Description
Technical field
The present invention relates to the technical field of circuit design of ultrasonic partial discharge sensor, more particularly to a kind of high-precision signal
The ultrasonic partial discharge sensor of frequency down circuit design.
Background technique
Generation current factory, substation's middle-low voltage switch cabinet are large number of, and running environment is severe, and internal element is easy aging,
So as to cause partial discharge phenomenon.And shelf depreciation refers to the electric discharge for occurring between the electrodes but to run through the two poles of the earth, it be by
The defect caused by apparatus insulated inside is there are in disadvantage or production process, high electric-field intensity effect under occur repeat breakdown and
The phenomenon that extinguishing.
The ability of this electric discharge is very little, so there is the dielectric strength for having no effect on electrical equipment in short-term in its,
If but constantly there is shelf depreciation under insulation voltage in electrical equipment, and cumulative effect can be made insulation by these faint electric discharges
Dielectric properties gradually degrade and local defect expansion are made to finally result in entire insulation breakdown, although shelf depreciation can make insulation degradation
And cause to damage, but its development is to need certain time, so needing periodically to survey shelf depreciation using instrument for measuring partial discharge.
The detection most commonly used scheme of shelf depreciation is installation ultrasonic wave local discharge sensor.Ultrasonic wave local discharge sensor core
It is hardware components, and the mostly important circuit of hardware components is signal down circuit.
Signal down circuit in existing ultrasonic wave Partial Discharge Detection is broadly divided into following components: first, packet
Network detection circuit, envelope detected mode mostly use diode detection circuit, such as tandem type detecting circuit, parallel connection type detection electricity
Road, multiplication of voltage detecting circuit, peak-detector circuit etc.；Second, filter circuit mostly uses low order passive filter.But existing skill
In art, detecting circuit realizes that effect is poor, is easy to happen inertia distortion negative peak cutting distortion, while can introduce noise；Tandem type two
Pole pipe envelope detection is suitable for big signal peak detection, and detection can not be carried out to small signal, and peak-detector circuit needs to increase fortune
The active components such as amplifier are calculated, it is more demanding to amplifier, while also increasing the cost of device；Traditional filter circuit dynamic response
Range is small, cannot take into account to small signal and big signal processing；Traditional passive filter circuit passband amplification factor and its cutoff frequency
All change with load, is not suitable for the high occasion of signal processing requirement, meanwhile, the passband of conventional filter also suffers from input
The influence of resistance and output resistance, the i.e. internal resistance in input end signal source can be such that filter network resonance point deviates, to reduce filter
Wave effect；Overall signal frequency reducing is larger by external interference, so that detection device sensitivity is low.
Summary of the invention
The object of the present invention is to provide a kind of ultrasonic partial discharge sensors of high-precision signal frequency down circuit design, have height
Precision special signal frequency down circuit, circuit structure is simple, takes into account small signal and big signal processing, can largely raising office
The detection accuracy and detection sensitivity of portion's electric discharge.
To achieve the above object, the present invention provides following schemes:
A kind of ultrasonic partial discharge sensor of high-precision signal frequency down circuit design, the sensor include high-precision signal drop
Frequency circuit, the high-precision signal frequency down circuit include the detecting circuit and filter circuit being electrically connected, the detecting circuit packet
Include first resistor R1, second resistance R2,3rd resistor R3, first diode D1, the second diode D2, first capacitor C1 and second
Capacitor C2, one end of the first resistor R1 are connect with signal input part, other end ground connection, one end of the first diode D1
It is connect with rectified signal input terminal, the other end is connect with one end of the second resistance R2, the other end of the second resistance R2
Ground connection, the first capacitor C1 is in parallel with the second resistance R2, one end of the second capacitor C2 and the first capacitor C1
The connection of ungrounded end, the other end of the second capacitor C2 connect with one end of the second diode D2, the described 2nd 2
The other end of pole pipe D2 is grounded, and the 3rd resistor R3 is in parallel with the second diode D2, and the non-of 3rd resistor R3 connects
Ground terminal is connect with rectified signal output end；The rectified signal output end is connect with filtering signal input terminal；
The filter circuit includes the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance
R8, the 9th resistance R9, third capacitor C3, the 4th capacitor C4, the 5th capacitor C5 and operational amplifier A, the 4th resistance R4 with
5th resistance R5 connects to form the first branch, and one end of the first branch is connect with the filtering signal input terminal, and described
Three capacitor C3 connect to form second branch with the 4th capacitor C4, after the second branch is in parallel with the first branch described in connection
The positive input of operational amplifier A；One end of the 6th resistance R6 is connected to the third capacitor C3 and the 4th capacitor C4
Before, the other end is grounded；One end of the 5th capacitor C5 is connected between the 4th resistance R4 and the 5th resistance R5, another
End is connected to the output end of the operational amplifier A, and one end of the 4th resistance R7 is being connected to the operational amplifier A just
To input terminal, other end ground connection, one end of the 6th capacitor C6 is connected to the positive input of the operational amplifier A,
Other end ground connection；One end of the 8th resistance R8 is connected to the inverting input terminal of the operational amplifier A, other end ground connection；
One end of the 9th resistance R9 is connected to the inverting input terminal of the operational amplifier A, and the other end is connected to the operation and puts
The output end of big device A.
Optionally, the circuit element value relationship of the filter circuit is as follows:
If median a, b, c is as follows:
C=2 π fr；
Wherein, the quality factor of Q indication circuit, f0Indicate the cluster center frequency of the filter circuit, frIndicate the filter
The resonance frequency of wave circuit；
Then circuit element value are as follows:
C5=C,
R4=R5=2R6,
R8=R,
R9=(1-K) R；
Wherein, C, R are setting a reference value,
The specific embodiment provided according to the present invention, the invention discloses following technical effects: provided by the invention high-precision
The ultrasonic partial discharge sensor of signal down circuit design is spent, there is the dedicated frequency down circuit of high-precision, can largely mention
The measurement accuracy of the high sensor, this frequency down circuit are broadly divided into signal demodulator circuit and filter circuit；The ultrasonic partial discharge passes
Sensor has originally used multistage Serial-Parallel Type detecting circuit, in conjunction with the advantage and disadvantage of series connection detection and detection in parallel, in detection
During can not only isolated DC component, and compare traditional detecting circuit, noise is smaller, during actual measurement not
Inertia distortion and negative peak cutting distortion can be generated, simultaneously as the circuit is sensitive to small signal reaction, it is more more suitable than traditional circuit
Together in the detection of small signal, moreover, the circuit dynamic range is big, no matter to big signal or small signal, good inspection is all had
Wave effect solves the disadvantage that traditional filter circuit cannot take into account high low signal；In addition, the present invention provides a kind of dedicated filters
Wave circuit has used the independent active elliptic Function Bandpass Filters of simulation to replace traditional low order passive filter, load
Change the performance of the filter is influenced it is faint, therefore the filter rear both can with carry relatively large load, also can carry it is smaller
Load, meanwhile, the filter can effectively adjustment circuit input and output impedance, network resonance point is relatively stable, be not easy partially
It moves, to reduce wave distortion and the loss of voltage of the signal in frequency down circuit.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in 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 any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is detecting circuit of embodiment of the present invention structural schematic diagram；
Fig. 2 is filter circuit construction schematic diagrame of the embodiment of the present invention；
Fig. 3 is the amplitude-frequency response of filter circuit of the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of ultrasonic partial discharge sensors of high-precision signal frequency down circuit design, have height
Precision special signal frequency down circuit, circuit structure is simple, takes into account small signal and big signal processing, can largely raising office
The detection accuracy and detection sensitivity of portion's electric discharge.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
As Figure 1-Figure 2, the ultrasonic partial discharge sensor of high-precision signal frequency down circuit design provided by the invention, packet
High-precision signal frequency down circuit is included, the high-precision signal frequency down circuit includes the detecting circuit and filter circuit being electrically connected,
The detecting circuit includes first resistor R1, second resistance R2,3rd resistor R3, first diode D1, the second diode D2,
One capacitor C1 and the second capacitor C2, one end of the first resistor R1 are connect with signal input part, other end ground connection, and described first
One end of diode D1 is connect with rectified signal input terminal, and the other end is connect with one end of the second resistance R2, and described second
The other end of resistance R2 is grounded, and the first capacitor C1 is in parallel with the second resistance R2, one end of the second capacitor C2 and
The ungrounded end of the first capacitor C1 connects, and one end of the other end of the second capacitor C2 and the second diode D2 connect
It connects, the other end ground connection of the second diode D2, the 3rd resistor R3 is in parallel with the second diode D2, the third
The ungrounded end of resistance R3 is connect with rectified signal output end；The rectified signal output end is connect with filtering signal input terminal；
In order to improve the signal stabilization and reliability of front-end collection, original signal frequency, detection of the present invention are further decreased
Circuit is the multistage Serial-Parallel Type detecting circuit specially designed, and the realization of detecting circuit is conducive to adc circuit to front end signal
It acquires and to discharge time, the judgement of discharge phase can mitigate the pressure of CPU；Signal inputs from A, and voltage is high at A
When at B, D1 diode current flow charges to C1.When voltage is lower than at B at A, diode C1 shutdown, capacitor C1 is through resistance R1
Electric discharge, first detection terminate.Detection process in parallel is similar with series connection detection process.When diode D2 conducting, signal is to capacitor
C2 charging.When diode D2 cut-off, capacitor C2 is discharged by R3, thus completes a detection process.Due to parallel connection type circuit
Lower than series circuit with voltage transmission coefficient, C2 can have the effect of partiting dc capacitor concurrently, therefore after can effectively reducing
The pressure of continuous acquisition system；Signal inputs from A, and when voltage is higher than at B at A, D1 diode current flow charges to C1, at A
When voltage is located lower than B, diode C1 is turned off, and capacitor C1 discharges through resistance R1, and first detection terminates, detection process in parallel with connect
Detection process is similar.When diode D2 conducting, signal charges to capacitor C2, and when diode D2 cut-off, capacitor C2 passes through R3
Thus a detection process is completed in electric discharge, since parallel connection type circuit has voltage transmission coefficient lower than series circuit, C2 can be with
It has the effect of partiting dc capacitor concurrently, therefore the pressure of subsequent acquisition system can be effectively reduced.
As shown in Fig. 2, the filter circuit includes the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance
R7, the 8th resistance R8, the 9th resistance R9, third capacitor C3, the 4th capacitor C4, the 5th capacitor C5 and operational amplifier A, described
Four resistance R4 connect to form the first branch with the 5th resistance R5, and one end of the first branch and the filtering signal input terminal connect
It connects, the third capacitor C3 connects to form second branch with the 4th capacitor C4, and the second branch is in parallel with the first branch
The positive input of the operational amplifier A is connected afterwards；One end of the 6th resistance R6 be connected to the third capacitor C3 with
Before 4th capacitor C4, other end ground connection；One end of the 5th capacitor C5 is connected to the 4th resistance R4 and the 5th resistance
Between R5, the other end is connected to the output end of the operational amplifier A, and one end of the 4th resistance R7 is connected to the operation
The positive input of amplifier A, other end ground connection, one end of the 6th capacitor C6 is connected to the operational amplifier A's
Positive input, other end ground connection；One end of the 8th resistance R8 is connected to the inverting input terminal of the operational amplifier A,
Other end ground connection；One end of the 9th resistance R9 is connected to the inverting input terminal of the operational amplifier A, and the other end is connected to
The output end of the operational amplifier A.The filter circuit uses VCVS network, and transmission zero can be as needed near pole
It obtains.
The circuit element value relationship of the filter circuit is as follows:
If median a, b, c is as follows:
C=2 π fr；
Wherein, the quality factor of Q indication circuit, f0Indicate the cluster center frequency of the filter circuit, frIndicate the filter
The resonance frequency of wave circuit；
Then circuit element value are as follows:
C5=C,
R4=R5=2R6,
R8=R,
R9=(1-K) R；
Wherein, C, R are setting a reference value, can be set according to circuit performance demand,
Fig. 3 is the amplitude-frequency response of filter circuit of the embodiment of the present invention, as shown in figure 3, the filter circuit intermediate zone is narrow,
Edge is precipitous, and passband and stopband are all equal ripples, has outstanding edge characteristics, can not only filter out the external world of non-passband
Interference, can also be effectively improved the input and output impedance of entire circuit, largely promote the precision of detecting circuit.
The ultrasonic partial discharge sensor of high-precision signal frequency down circuit design provided by the invention, has the dedicated drop of high-precision
Frequency circuit, can largely improve the measurement accuracy of the sensor, this frequency down circuit be broadly divided into signal demodulator circuit with
Filter circuit；The ultrasonic partial discharge sensor has originally used multistage Serial-Parallel Type detecting circuit, in conjunction with series connection detection with
The advantage and disadvantage of detection in parallel, during detection can not only isolated DC component, and compare traditional detecting circuit,
Noise is smaller, inertia distortion and negative peak cutting distortion will not be generated during actual measurement, simultaneously as the circuit is anti-to small signal
Answer it is sensitive, than the detection that traditional circuit is more suitable for small signal, moreover, the circuit dynamic range is big, no matter to big signal also
It is small signal, all has good detection effect, solves the disadvantage that traditional filter circuit cannot take into account high low signal；This
Outside, the present invention provides a kind of dedicated filter circuits, and the independent active elliptic Function Bandpass Filters of simulation has been used to replace passing
The low order passive filter of system, the variation of load influence the performance of the filter faint, therefore the filter rear both can be with
Carry relatively large load, also can the smaller load of carry, meanwhile, the filter can effectively adjustment circuit input and output impedance,
Network resonance point is relatively stable, is not easy to deviate, to reduce wave distortion and the loss of voltage of the signal in frequency down circuit.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, foundation
Thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (2)
1. a kind of ultrasonic partial discharge sensor of high-precision signal frequency down circuit design, which is characterized in that including high-precision signal
Frequency down circuit, the high-precision signal frequency down circuit include the detecting circuit and filter circuit being electrically connected, the detecting circuit
Including first resistor R1, second resistance R2,3rd resistor R3, first diode D1, the second diode D2, first capacitor C1 and
Two capacitor C2, one end of the first resistor R1 are connect with signal input part, other end ground connection, and the one of the first diode D1
End is connect with rectified signal input terminal, and the other end is connect with one end of the second resistance R2, and the second resistance R2's is another
End ground connection, the first capacitor C1 is in parallel with the second resistance R2, one end of the second capacitor C2 and the first capacitor
The ungrounded end of C1 connects, and the other end of the second capacitor C2 is connect with one end of the second diode D2, and described second
The other end of diode D2 is grounded, and the 3rd resistor R3 is in parallel with the second diode D2, and the 3rd resistor R3's is non-
Ground terminal is connect with rectified signal output end；The rectified signal output end is connect with filtering signal input terminal；
The filter circuit includes the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the
Nine resistance R9, third capacitor C3, the 4th capacitor C4, the 5th capacitor C5 and operational amplifier A, the electricity of the 4th resistance R4 and the 5th
Resistance R5 connects to form the first branch, and one end of the first branch is connect with the filtering signal input terminal, the third capacitor
C3 connects to form second branch with the 4th capacitor C4, connects the operation after the second branch is in parallel with the first branch and puts
The positive input of big device A；One end of the 6th resistance R6 is connected to before the third capacitor C3 and the 4th capacitor C4, separately
One end ground connection；One end of the 5th capacitor C5 is connected between the 4th resistance R4 and the 5th resistance R5, other end connection
To the output end of the operational amplifier A, one end of the 4th resistance R7 is connected to the positive input of the operational amplifier A
End, other end ground connection, one end of the 6th capacitor C6 is connected to the positive input of the operational amplifier A, the other end
Ground connection；One end of the 8th resistance R8 is connected to the inverting input terminal of the operational amplifier A, other end ground connection；Described
One end of nine resistance R9 is connected to the inverting input terminal of the operational amplifier A, and the other end is connected to the operational amplifier A's
Output end.
2. the ultrasonic partial discharge sensor of high-precision signal frequency down circuit design according to claim 1, which is characterized in that
The circuit element value relationship of the filter circuit is as follows:
If median a, b, c is as follows:
C=2 π fr；
Wherein, the quality factor of Q indication circuit, f0Indicate the cluster center frequency of the filter circuit, frIndicate the filtered electrical
The resonance frequency on road；
Then circuit element value are as follows:
C5=C,
R4=R5=2R6,
R8=R,
R9=(1-K) R；
Wherein, C, R are setting a reference value,
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| CN112838843A (en) * | 2020-12-30 | 2021-05-25 | 北京千方科技股份有限公司 | Signal conditioning device and signal conditioning method |
| CN114189230A (en) * | 2021-10-25 | 2022-03-15 | 中国电子科技集团公司第二十九研究所 | Tunable anti-interference pulse self-checking detection circuit |
| CN114252146A (en) * | 2021-12-10 | 2022-03-29 | 中国计量科学研究院 | Sensitivity frequency characteristic adjusting circuit, vibration sensor, and sensor |
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| CN112838843B (en) * | 2020-12-30 | 2024-02-27 | 北京千方科技股份有限公司 | Signal conditioning device and signal conditioning method |
| CN114189230A (en) * | 2021-10-25 | 2022-03-15 | 中国电子科技集团公司第二十九研究所 | Tunable anti-interference pulse self-checking detection circuit |
| CN114252146A (en) * | 2021-12-10 | 2022-03-29 | 中国计量科学研究院 | Sensitivity frequency characteristic adjusting circuit, vibration sensor, and sensor |
| CN114252146B (en) * | 2021-12-10 | 2023-10-24 | 中国计量科学研究院 | Sensitivity frequency characteristic adjustment circuit, vibration sensor, and sensor |
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