CN215003927U - Noise signal sensing device based on intelligent distribution transformation visual management and control platform - Google Patents
Noise signal sensing device based on intelligent distribution transformation visual management and control platform Download PDFInfo
- Publication number
- CN215003927U CN215003927U CN202120922694.XU CN202120922694U CN215003927U CN 215003927 U CN215003927 U CN 215003927U CN 202120922694 U CN202120922694 U CN 202120922694U CN 215003927 U CN215003927 U CN 215003927U
- Authority
- CN
- China
- Prior art keywords
- amplifier
- circuit
- input end
- signal
- electrically connected
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Amplifiers (AREA)
Abstract
The utility model provides a noise signal perception device based on visual management and control platform of intelligent distribution transformer sets up two-stage amplifier at the back-end of noise sensor and amplifies the weak signal, is convenient for pick up the noise signal and is convenient for draw the noise signal out from interfering signal, avoids the condition that the small signal can't be gathered; a fourth-order band-pass filter is arranged at the rear stage of the two-stage amplifier, so that a high filtering effect can be obtained, and meanwhile, useful noise signals can be extracted, and the measurement precision is improved; the output end of the bias circuit in the addition circuit is provided with a voltage stabilizing circuit, and the voltage stabilizing circuit is used for stabilizing the reference voltage signal output by the bias circuit, so that the reference voltage signal does not change along with the change of the load, the output stability of the bias circuit is ensured, and the sampling precision is improved.
Description
Technical Field
The utility model relates to a distribution transformer fault monitoring technology field especially relates to noise signal perception device based on visual management and control platform of intelligence distribution transformer.
Background
The intelligent distribution transformer visual front-end state sensing system is used for load operation and fault monitoring of a distribution transformer, and is a set of intelligent distribution transformer comprehensive control platform with remote transmission capability, centralized management and timely notification. The operation parameters of the distribution transformer can be collected, the collected information can be transmitted to a main station or other intelligent devices, required data are provided for remote operation, control and management of a distribution system, the state of the distribution transformer can be further analyzed, and state maintenance and risk assessment of the distribution transformer are achieved.
The distribution transformer is used as a core device for electric energy transportation of a distribution network, and plays an important role in the processes of transmission, distribution and use. In order to avoid greater harm caused by the faults of the distribution transformer, the realization of the state monitoring and the fault prediction of the distribution transformer is a key point for reducing the faults of the power grid and improving the quality of the power grid. Since the distribution transformer is affected by the operating characteristics and the manufacturing process, a large noise is inevitably generated during operation, which is mainly caused by the continuous vibration of the body. Generally, a noise sensor is mounted on the surface of a distribution transformer, noise signals generated in the operation process of equipment are acquired and output to a microprocessor after being processed by a signal processing circuit, the microprocessor extracts time domain and frequency domain characteristic information of the noise signals to form information representing the operation state of the equipment, and then the working state of the equipment is evaluated by adopting a certain fault diagnosis method.
As the noise sensor detects very weak noise signals, researches show that the frequency coverage range of the noise signals is 5 Hz-1000 Hz, and various interference sources exist on site, so that useful signals are submerged in the interference signals, and the noise signals in a specific frequency range cannot be extracted for fault analysis. Therefore, in order to solve the above problem, the utility model provides a noise signal perception device based on visual management and control platform of intelligence distribution transformer through set up two-stage amplifier and band pass filter in signal processing circuit, can enlarge weak signal through the two-stage amplifier to with pick up noise signal, through the interfering signal who participates in the two-stage amplifier output signal of band pass filter filtering, can draw out noise signal from interfering signal.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a noise signal perception device based on visual management and control platform is joined in marriage to intelligence is through setting up two-stage amplifier and band pass filter in signal processing circuit, can enlarge weak signal through the two-stage amplifier to with pick up noise signal, through the interfering signal who participates in the band pass filter filtering two-stage amplifier output signal, can draw out noise signal from interfering signal.
The technical scheme of the utility model is realized like this: the utility model provides a noise signal perception device based on intelligent distribution transformation visual management and control platform, which comprises a noise sensor, an amplifying circuit, an adding circuit and a microprocessor, and also comprises a band-pass filter;
the amplifying circuit comprises a first-stage amplifier and a second-stage amplifier;
the noise sensor detects noise signals generated in the operation process of the distribution network transformer, the output end of the noise sensor is electrically connected with the input end of the secondary amplifier through the primary amplifier, the output end of the secondary amplifier is electrically connected with the input end of the addition circuit through the band-pass filter, and the output end of the addition circuit is electrically connected with the analog input end of the microprocessor.
On the basis of the above technical solution, preferably, the first-stage amplifier includes: resistors R1-R3, capacitor C1 and operational amplifier OPA690 IDR;
the output end of the noise sensor is electrically connected with the inverting input end of the operational amplifier OPA690IDR through a resistor, the non-inverting input end of the operational amplifier OPA690IDR is grounded through a resistor R2, a resistor R3 is connected in parallel between the inverting input end of the operational amplifier OPA690IDR and the output end of the operational amplifier OPA690IDR, a capacitor C1 is connected in parallel at two ends of a resistor R3, and the output end of the operational amplifier OPA690IDR is electrically connected with the input end of the secondary amplifier.
On the basis of the above technical solution, preferably, the band pass filter is a fourth-order active band pass filter.
On the basis of the above technical solution, preferably, the adder circuit includes a bias circuit and an adder;
the bias circuit is electrically connected with the non-inverting input end of the adder, the output end of the secondary amplifier is electrically connected with the inverting input end of the adder through the band-pass filter, and the output end of the adder is electrically connected with the analog input end of the microprocessor.
On the basis of the above technical solution, preferably, the adder circuit further includes a voltage stabilizing circuit;
the bias circuit is electrically connected with the non-inverting input end of the adder through the voltage stabilizing circuit.
On the basis of the above technical solution, preferably, the voltage stabilizing circuit includes a voltage follower and an amplifier;
the bias circuit is electrically connected with the input end of the voltage follower, and the output end of the voltage follower is electrically connected with the non-inverting input end of the adder through the amplifier.
The utility model discloses a noise signal perception device based on visual management and control platform of intelligence distribution transformer has following beneficial effect for prior art:
(1) a two-stage amplifier is arranged at the rear stage of the noise sensor to amplify the weak signal, so that the noise signal is convenient to pick up and extract from the interference signal, and the condition that the small signal cannot be collected is avoided;
(2) a fourth-order band-pass filter is arranged at the rear stage of the two-stage amplifier, so that a high filtering effect can be obtained, and meanwhile, useful noise signals can be extracted, and the measurement precision is improved;
(3) the output end of the bias circuit in the addition circuit is provided with a voltage stabilizing circuit, and the voltage stabilizing circuit is used for stabilizing the reference voltage signal output by the bias circuit, so that the reference voltage signal does not change along with the change of the load, the output stability of the bias circuit is ensured, and the sampling precision is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a structural diagram of the noise signal sensing device based on the intelligent distribution visual management and control platform of the present invention;
fig. 2 is a circuit diagram of an amplifying circuit in the noise signal sensing device based on the intelligent distribution visual management and control platform of the utility model;
fig. 3 is the utility model discloses add circuit's circuit diagram among noise signal perception device based on visual management and control platform is joined in marriage to intelligence.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
As shown in fig. 1, the utility model discloses a noise signal perception device based on visual management and control platform is joined in marriage to intelligence, it includes noise sensor, amplifier circuit, band pass filter, addition circuit and microprocessor.
The noise generated inside the distribution network transformer depends on the capacity, the internal structure, the manufacturing material, the magnetic flux density and the vibration characteristics of the transformer. Through statistics, the frequency of noise generated inside the distribution network transformer is different from 5Hz to 1000Hz, so that the information representing the running state of the distribution network transformer is formed conveniently on the basis of the noise information, and the working state of the equipment is evaluated by combining a fault diagnosis method. In the embodiment, the noise sensor collects a noise signal in a frequency range of 5Hz to 1000Hz, converts the noise signal into an alternating current signal and outputs the alternating current signal to the amplifying circuit.
And the amplifying circuit is used for amplifying the weak signal. Due to the existence of various interference sources in the field, a useful signal is submerged in an interference signal, and a noise signal in a specific frequency range cannot be extracted for fault analysis. Therefore, in order to solve the above problem, in this embodiment, a two-stage amplifier and a band pass filter are provided, the two-stage amplifier can amplify the weak signal and pick up the noise signal, and the band pass filter filters the interference signal doped in the output signal of the two-stage amplifier, so that the noise signal can be extracted from the interference signal. As shown in fig. 1, the amplifying circuit includes a primary amplifier and a secondary amplifier; the output end of the noise sensor is electrically connected with the input end of the secondary amplifier through the primary amplifier, the output end of the secondary amplifier is electrically connected with the input end of the adding circuit through the band-pass filter, and the output end of the adding circuit is electrically connected with the analog input end of the microprocessor. In this embodiment, the first-stage amplifier and the second-stage amplifier may have the same or different structures. The same is set here, and therefore, the present embodiment describes only the structure of the one-stage amplifier.
Preferably, as shown in fig. 2, the one-stage amplifier includes: resistors R1-R3, capacitor C1 and operational amplifier OPA690 IDR; the output end of the noise sensor is electrically connected with the inverting input end of the operational amplifier OPA690IDR through a resistor, the non-inverting input end of the operational amplifier OPA690IDR is grounded through a resistor R2, a resistor R3 is connected in parallel between the inverting input end of the operational amplifier OPA690IDR and the output end of the operational amplifier OPA690IDR, a capacitor C1 is connected in parallel at two ends of a resistor R3, and the output end of the operational amplifier OPA690IDR is electrically connected with the input end of the secondary amplifier. In fig. 2, the capacitor C0 plays a role of isolating the dc signal, so as to prevent the dc signal from entering the operational amplifier OPA690IDR, which may cause the amplification effect of the operational amplifier to fail to reach the expected effect; the resistor R3 and the capacitor C1 connected in parallel are used to compensate the parasitic capacitance of the inverting node of the operational amplifier OPA690IDR, thereby maintaining the stability of the operational amplifier OPA690 IDR.
And the band-pass filter is used for filtering the signals picked up by the amplifying circuit. The high-order passive band-pass filter composed of the resistor, the inductor and the capacitor has a large attenuation to signals, and is not suitable for extracting noise signals by using the high-order passive band-pass filter on the premise that the output signals of the noise sensor are weak, so that the high-order active band-pass filter is realized by using the active high-pass filter and the active low-pass filter composed of the operational amplifier in the embodiment. In order to obtain a better filtering effect, in this embodiment, the order of the band-pass filter is set to fourth order.
Because the output signal of the noise sensor is a +/-5V alternating current signal, the fluctuation takes 0V as reference voltage, and the limitation of the limit value of a later-stage operational amplifier causes that half-wave shapes smaller than 0V in the +/-5V alternating current signal cannot be amplified, in order to collect negative half-wave signals, a constant direct current voltage is generally superposed in the output signal of the noise amplifier, the 0V reference voltage of the alternating current signal output by the noise sensor is raised, and a voltage raising method is adopted to cause an addition circuit to output a positive voltage signal which can be sampled by an A/D pin of a microprocessor. In this embodiment, the alternating current signal is added to the reference voltage output by the bias circuit in a voltage raising manner, so that the output signal of the vibration sensor is conveniently acquired by the microprocessor. However, the reference voltage output by the bias circuit is easily affected by the load, so that the output of the bias circuit is unstable, the output of the addition circuit is unstable, and part of signals cannot be sampled by the microprocessor. Therefore, in order to solve the above problem, in this embodiment, a voltage stabilizing circuit is provided in the adder circuit, and the reference voltage signal output by the bias circuit is subjected to voltage stabilization processing so as not to change with load change, thereby ensuring the output stability of the bias circuit and improving the sampling accuracy. Preferably, as shown in fig. 1, in the present embodiment, the adder circuit includes: a bias circuit, a voltage stabilizing circuit and an adder; the output end of the secondary amplifier is electrically connected with the inverting input end of the adder circuit through the band-pass filter, the bias circuit is electrically connected with the non-inverting input end of the adder circuit through the voltage stabilizing circuit, and the output end of the adder circuit is electrically connected with the analog input end of the microprocessor.
And the bias circuit is used for improving a reference voltage signal with stable amplitude for the non-inverting input end of the addition circuit. In this embodiment, as shown in fig. 3, it includes a resistor R24 and a resistor R25 with equal resistance, and the input power is 5V, so the bias circuit provides a reference voltage of 2.5V.
And the voltage stabilizing circuit is used for stabilizing the reference voltage signal output by the bias circuit, so that the reference voltage signal does not change along with the change of the load, the output stability of the bias circuit is ensured, and the sampling precision is improved. The voltage stabilizing circuit comprises a voltage follower and an amplifier; the bias circuit is electrically connected with the input end of the voltage follower, and the output end of the voltage follower is electrically connected with the non-inverting input end of the adder through the amplifier. The voltage follower is used for improving input impedance and playing a role in buffering, and the effect of the embodiment can be realized by adopting the existing voltage follower circuit structure; the amplifier is used for adjusting the amplitude of the reference voltage, and when the load changes, the amplification factor of the amplifier is adjusted to ensure that the output signal of the bias circuit is stable and cannot change along with the change of the load. Preferably, the circuit structure of the amplifier is as shown in fig. 3, the amplification factor of the amplifier can be adjusted by adjusting the resistance values of the resistor R26 and the resistor R27, in this embodiment, the value of the resistor R26/R27 is 0.5, and therefore, the reference voltage of 2.5V is changed into a voltage signal of 1.25V after passing through the amplifier, and then the voltage signal is input to the non-inverting input terminal of the adder.
And the adder is used for carrying out voltage lifting on the output signal of the noise sensor and lifting the 0V reference voltage of the output alternating current signal of the noise sensor so as to be collected by the microprocessor. In this embodiment, the output terminal of the secondary amplifier is electrically connected to the inverting input terminal of the adder through the band-pass filter, the bias circuit is electrically connected to the non-inverting input terminal of the adder through the voltage stabilizing circuit, and the output terminal of the adder is electrically connected to the analog input terminal of the microprocessor. Preferably, as shown in fig. 3, the adder includes an operational amplifier AD8605, a resistor R14, a diode D3, and a diode D4. The diode D3 and the diode D4 have an amplitude limiting function, limit the input signal amplitudes of the non-inverting input terminal and the inverting input terminal of the operational amplifier AD8605, and protect the input stage of the operational amplifier AD 8605. In this embodiment, a voltage signal of ± 5V is input to the inverting input terminal of the operational amplifier AD8605, a voltage signal of 1.25V is input to the non-inverting input terminal of the operational amplifier AD8605, and after being processed by the operational amplifier AD8605, a signal of-3.25 to 6.25V is finally output, and the median of the signal of ± 5V output by the noise sensor is raised from 0 to 1.25V, so that the microprocessor can collect a signal of a negative half wave of the ac signal of ± 5V.
And the microprocessor receives the signal output by the addition circuit and performs analog-to-digital conversion processing. In this embodiment, the type of the microprocessor is not limited.
The working principle of the embodiment is as follows: the output signal of the noise sensor is amplified by a first-stage amplifier and a second-stage amplifier and then input into a fourth-order active band-pass filter for filtering, interference signals outside a frequency band are filtered, noise signals in a frequency range of 5 Hz-1000 Hz are obtained, the filtered signal is input into an inverting input end of an adder, a bias circuit provides bias voltage, the bias voltage is stabilized by a voltage stabilizing circuit and then input into a non-inverting input end of the adder, and the adder adds the bias voltage and the filtered voltage, so that the central value of the output signal of the noise sensor is raised, and the output signal of the noise sensor is convenient to sample by a rear-stage microprocessor.
The beneficial effect of this embodiment does: a two-stage amplifier is arranged at the rear stage of the noise sensor to amplify the weak signal, so that the noise signal is convenient to pick up and extract from the interference signal, and the condition that the small signal cannot be collected is avoided;
a fourth-order band-pass filter is arranged at the rear stage of the two-stage amplifier, so that a high filtering effect can be obtained, and meanwhile, useful noise signals can be extracted, and the measurement precision is improved;
the output end of the bias circuit in the addition circuit is provided with a voltage stabilizing circuit, and the voltage stabilizing circuit is used for stabilizing the reference voltage signal output by the bias circuit, so that the reference voltage signal does not change along with the change of the load, the output stability of the bias circuit is ensured, and the sampling precision is improved.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. Noise signal perception device based on visual management and control platform of intelligence distribution transformer, it includes noise sensor, amplifier circuit, addition circuit and microprocessor, its characterized in that: also includes a band-pass filter;
the amplifying circuit comprises a primary amplifier and a secondary amplifier;
the noise sensor detects noise signals generated in the operation process of the distribution network transformer, the output end of the noise sensor is electrically connected with the input end of the secondary amplifier through the primary amplifier, the output end of the secondary amplifier is electrically connected with the input end of the addition circuit through the band-pass filter, and the output end of the addition circuit is electrically connected with the analog input end of the microprocessor.
2. The noise signal perception device based on the intelligent distribution visualization management and control platform as claimed in claim 1, wherein: the primary amplifier includes: resistors R1-R3, capacitor C1 and operational amplifier OPA690 IDR;
the output end of the noise sensor is electrically connected with the inverting input end of the operational amplifier OPA690IDR through a resistor, the non-inverting input end of the operational amplifier OPA690IDR is grounded through a resistor R2, a resistor R3 is connected in parallel between the inverting input end of the operational amplifier OPA690IDR and the output end of the operational amplifier OPA690IDR, a capacitor C1 is connected in parallel at two ends of a resistor R3, and the output end of the operational amplifier OPA690IDR is electrically connected with the input end of the secondary amplifier.
3. The noise signal perception device based on the intelligent distribution visualization management and control platform as claimed in claim 1, wherein: the band-pass filter is a fourth-order active band-pass filter.
4. The noise signal perception device based on the intelligent distribution visualization management and control platform as claimed in claim 1, wherein: the addition circuit comprises a bias circuit and an adder;
the bias circuit is electrically connected with the non-inverting input end of the adder, the output end of the secondary amplifier is electrically connected with the inverting input end of the adder through the band-pass filter, and the output end of the adder is electrically connected with the analog input end of the microprocessor.
5. The noise signal perception device based on the intelligent distribution visualization management and control platform as claimed in claim 4, wherein: the addition circuit further comprises a voltage stabilizing circuit;
the bias circuit is electrically connected with the non-inverting input end of the adder through the voltage stabilizing circuit.
6. The noise signal perception device based on the intelligent distribution visualization management and control platform as claimed in claim 5, wherein: the voltage stabilizing circuit comprises a voltage follower and an amplifier;
the bias circuit is electrically connected with the input end of the voltage follower, and the output end of the voltage follower is electrically connected with the non-inverting input end of the adder through the amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120922694.XU CN215003927U (en) | 2021-04-29 | 2021-04-29 | Noise signal sensing device based on intelligent distribution transformation visual management and control platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120922694.XU CN215003927U (en) | 2021-04-29 | 2021-04-29 | Noise signal sensing device based on intelligent distribution transformation visual management and control platform |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215003927U true CN215003927U (en) | 2021-12-03 |
Family
ID=79089099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120922694.XU Active CN215003927U (en) | 2021-04-29 | 2021-04-29 | Noise signal sensing device based on intelligent distribution transformation visual management and control platform |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215003927U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117526877A (en) * | 2023-12-06 | 2024-02-06 | 惠然科技有限公司 | Signal amplification system, product and detection signal amplification method of electron microscope |
-
2021
- 2021-04-29 CN CN202120922694.XU patent/CN215003927U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117526877A (en) * | 2023-12-06 | 2024-02-06 | 惠然科技有限公司 | Signal amplification system, product and detection signal amplification method of electron microscope |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109921755A (en) | A kind of chopper amplification circuit using negative impedance compensation technique | |
| CN209946260U (en) | Improved signal sampling circuit | |
| CN215003927U (en) | Noise signal sensing device based on intelligent distribution transformation visual management and control platform | |
| CN101741349B (en) | Circuit for filtering stochastic resonance noise and detecting weak periodic signal | |
| CN203935181U (en) | A kind of ecg signal amplifier | |
| CN111935893B (en) | Electrostatic probe system with three-electrode structure | |
| CN111398662A (en) | Current sensor for power transmission line | |
| CN104000576A (en) | Electrocardiosignal amplifier | |
| CN205359469U (en) | A device for brain electric -examination is surveyed | |
| CN211528652U (en) | Transformer state monitoring circuit and equipment | |
| CN115267417B (en) | Accurate positioning method for power transmission line faults and power transmission line traveling wave measuring device | |
| WO2020113467A1 (en) | Inductive magnetic sensor and electromagnetic exploration device | |
| CN110840453A (en) | Circuit for collecting electroencephalogram signals and anti-interference method | |
| CN205786850U (en) | A kind of mains by harmonics signals collecting pretreatment circuit | |
| CN110609164A (en) | AC/DC voltage acquisition circuit of data acquisition recorder | |
| CN217693277U (en) | Noise sensing device for distribution network transformer | |
| CN202794285U (en) | Isolation processing circuit for small analog alternating current (AC) or direct current (DC) signals | |
| CN115754585A (en) | High-frequency current sensing acquisition unit adopting demagnetization technology | |
| CN212229025U (en) | Current sensor for power transmission line | |
| CN109407157B (en) | Induction type magnetic sensor and electromagnetic exploration equipment | |
| CN210123461U (en) | Online monitoring system of electronic irradiation equipment | |
| CN110703129A (en) | Transformer state monitoring circuit and equipment | |
| CN201548618U (en) | Stochastic resonance noise filtering and weak periodic signal detecting circuit | |
| CN212781020U (en) | Electric energy quality measuring device capable of detecting ultrahigh harmonic | |
| CN209281373U (en) | Direct current biasing for human body Collection equipment eliminates circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |