CN217358737U - Transformer space noise detection circuit - Google Patents
Transformer space noise detection circuit Download PDFInfo
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- CN217358737U CN217358737U CN202220262054.5U CN202220262054U CN217358737U CN 217358737 U CN217358737 U CN 217358737U CN 202220262054 U CN202220262054 U CN 202220262054U CN 217358737 U CN217358737 U CN 217358737U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The utility model discloses a transformer space noise detection circuitry belongs to transformer electrical fault detection technical field, include: a high performance microphone for receiving and detecting sound signals; the noise reduction filter circuit is used for carrying out ambient noise filtering on the sound signal to obtain transformer space noise; the signal enhancement circuit is used for carrying out signal enhancement on the space noise of the transformer; the fault diagnosis early warning circuit diagnoses the space noise to obtain the fault type and carries out early warning; the output end of the high-performance microphone is connected with the noise reduction filter circuit, the output end of the noise reduction filter circuit is connected with the signal enhancement circuit, and the output end of the signal enhancement circuit is connected with the fault diagnosis early warning circuit. The utility model discloses a high performance microphone measuring band width, sensitivity height, sufficient dynamic range, good and stable long-term acoustic performance cascade through two common mode coil's serial, increase the high frequency common mode differential mode impedance of circuit, reduce high frequency noise to can reduce environmental noise's high frequency noise.
Description
Technical Field
The utility model relates to a transformer electrical fault detects technical field, especially relates to a transformer space noise detection circuitry.
Background
With the continuous increase of the scale of the power grid and the continuous improvement of the voltage level, the noise influence problem of the power equipment is increasingly prominent, and the noise influence of the power equipment becomes an urgent problem which must be faced in the process of power grid construction. The transformer is one of the most dominant noise sources in the power equipment, and the noise detection is a precondition for analyzing and controlling the noise characteristics of the transformer. In addition, the noise of the power transformer is closely related to the operation state of the power transformer, and different noise characteristics correspond to different fault types, so that the noise detection has important significance for the state evaluation and fault diagnosis of the power transformer.
At present, in order to detect the noise of the transformer, a worker is required to carry a large amount of equipment to the site of the transformer substation, such as a sound level meter, a calibrator, an extension rod, a cable, a tripod and the like, so that the carrying is inconvenient, and the site needs to install the equipment. For a relatively remote transformer substation, the time for workers to go back and forth is relatively long, and the waste of manpower and material resources is easily caused. When the transformer substation to be tested is in a plurality of conditions, the testing period required for completing the noise detection of all transformers is long.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that to the not enough among the above-mentioned prior art, transformer space noise detection circuitry is disclosed.
The utility model provides a technical scheme that its technical problem adopted is:
transformer space noise detection circuitry includes:
a high performance microphone for receiving and detecting sound signals;
the noise reduction filter circuit is used for filtering environmental noise of the sound signal to obtain transformer space noise;
the signal enhancement circuit is used for carrying out signal enhancement on the space noise of the transformer;
the fault diagnosis early warning circuit diagnoses the space noise to obtain the fault type and carries out early warning;
the output end of the high-performance microphone is connected with a noise reduction filter circuit, the output end of the noise reduction filter circuit is connected with a signal enhancement circuit, and the output end of the signal enhancement circuit is connected with a fault diagnosis early warning circuit;
as a further technical scheme of the utility model do, high performance microphone adopts electret condenser measurement microphone, electret condenser measurement microphone includes the shell, the shell is groove structure, and wherein the recess bottom sets up the through-hole, the inside open-ended cavity that is provided with of recess, the inboard of cavity sets up the diaphragm, the bottom of cavity sets up the back of the body utmost point of being connected with the cavity embedding, the opening part of cavity sets up the circuit board, circuit board and cavity are fixed and set up in the inside of shell all around.
As a further technical scheme of the utility model do, between cavity and the diaphragm, set up the gasket between cavity and the back of the body utmost point.
As a further technical scheme of the utility model does, the outside of recess sets up the dust cover.
As a further technical solution of the present invention, the noise reduction filter circuit includes a first common mode coil, a second common mode coil, and a differential mode coil; the output end of the first common mode coil is connected with a second common mode coil, and the output end of the second common mode coil is connected with a differential mode coil.
As a further technical scheme of the utility model, connect an electrolytic capacitor between the output of the filter circuit of making an uproar and the ground wire.
As a further technical solution of the present invention, the signal enhancement circuit includes a windowing module, an FFT module, a power spectrum correction module, a phase recovery module, an IFFT module, and a windowing overlap-add module; the output end of the noise reduction filter circuit is connected with a windowing module, the output end of the windowing module is connected with an FFT module, the output end of the FFT module is connected with a power spectrum correction module, the output end of the power spectrum correction module is connected with a phase recovery module, the output end of the phase recovery module is connected with an IFFT module, and the output end of the IFFT module is connected with a windowing overlap-add module.
The utility model has the advantages that:
the utility model discloses high performance microphone measuring band width, sensitivity height, sufficient dynamic range, good and stable long-term acoustic performance. The outdoor field application needs are considered, wind-proof balls, bird thorns and rain-proof measures can be additionally arranged, and the long-term monitoring needs are met. The utility model discloses the filter circuit of making an uproar falls owing to increased a common mode coil, cascades through the serial of two common mode coils, increases the high frequency common mode differential mode impedance of circuit, reduces high frequency noise to can reduce environmental noise's high frequency noise.
Drawings
Fig. 1 is a schematic diagram of a transformer space noise detection circuit provided by the present invention;
fig. 2 is a schematic structural view of an electret condenser type measuring microphone according to the present invention;
fig. 3 is a schematic diagram of a noise reduction filter circuit provided by the present invention;
fig. 4 is a schematic diagram of a signal enhancement circuit according to the present invention.
Detailed Description
The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that the functions, methods, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.
As shown in fig. 1 to 4, which illustrate a specific embodiment of the present invention;
transformer space noise detection circuitry includes:
a high performance microphone 100 for receiving and detecting sound signals;
the noise reduction filter circuit 200 is used for filtering environmental noise of the sound signal to obtain transformer space noise;
the signal enhancement circuit 300 is used for carrying out signal enhancement on the space noise of the transformer;
the fault diagnosis early warning circuit 400 diagnoses the spatial noise to obtain the fault type and performs early warning;
the output end of the high-performance microphone 100 is connected with the noise reduction filter circuit 200, the output end of the noise reduction filter circuit 200 is connected with the signal enhancement circuit 300, and the output end of the signal enhancement circuit 300 is connected with the fault diagnosis early warning circuit 400.
The embodiment of the utility model provides an in, high performance microphone is received and is detected sound signal, after noise reduction filter circuit carries out the filtering to ambient noise, obtains transformer space noise, and space noise carries out the signal enhancement through signal enhancement circuit, later carries out failure diagnosis early warning circuit.
The utility model discloses high performance microphone measuring band width, sensitivity height, sufficient dynamic range, good and stable long-term acoustic performance. The outdoor field application needs are considered, and the windproof ball, the bird thorn and the rainproof measures can be additionally arranged, so that the long-term monitoring needs are met. The utility model discloses the filter circuit of making an uproar falls owing to increased a common mode coil, cascades through the serial of two common mode coils, increases the high frequency common mode differential mode impedance of circuit, reduces high frequency noise to can reduce environmental noise's high frequency noise.
Referring to fig. 2, the high performance microphone 100 adopts an electret capacitive measurement microphone, the electret capacitive measurement microphone includes a housing 101, the housing 101 is a groove structure, a through hole 111 is formed at the bottom of the groove, an open cavity 102 is formed in the groove, a diaphragm 103 is arranged on the inner side of the cavity 102, a back electrode 104 connected with the cavity 102 in an embedded manner is arranged at the bottom of the cavity 102, a circuit board 105 is arranged at the opening of the cavity 102, and the circuit board 105 and the cavity 102 are fixed around and arranged in the housing 101.
In the embodiment of the present invention, between cavity 102 and diaphragm 103, gasket 106 is disposed between cavity 102 and back electrode 104, and dust cover 107 for dust-proof sundries is disposed outside the groove.
The high-performance microphone adopts an electret capacitance type measuring microphone, the common size is 1/2 or 1/4 inches, the frequency response range is 20 Hz-20 kHz, and the sensitivity is about 50 mV/Pa. The electret capacitor type measuring microphone has the advantages of wide measuring frequency band, high sensitivity, enough dynamic range and good and stable long-term acoustic performance. The outdoor field application needs are considered, and the windproof ball, the bird thorn and the rainproof measures can be additionally arranged, so that the long-term monitoring needs are met.
The transformer acoustic signal is susceptible to ambient noise and can be classified into burst noise and quasi-stationary noise according to its nature. The sudden noise has the characteristics of uncertain time and intermittent occurrence, such as human voice and car voice. Quasi-stationary noise has certain persistence and stationarity in a period of time, and is relatively stable in both time domain and frequency domain, such as wind noise.
The utility model discloses the filtering circuit that makes an uproar falls adopts the wave filter method of making an uproar, according to the ambient noise characteristics, can design low pass, band-pass, high pass, comb filter, utilizes the spectral distribution difference of ambient noise and transformer acoustic signal to fall and makes an uproar.
The utility model discloses use low pass filter as the example, design filtering high frequency noise.
As shown in FIG. 3, the noise reduction filter circuit comprises a first common mode coil U1, a second common mode coil U2 and a differential mode coil L1. The port IN1 of the first common mode coil U1 is grounded, and the port IN2 is connected with the input end of the noise reduction filter circuit; the port of IN1 of the second common mode coil U2 is connected with the port of OUTL of the first common mode coil U1, the port of IN2 is connected with the port of OUT2 of the first common mode coil U1, the port of OUTL of the second common mode coil U2 is grounded, the port of OUT2 is connected with one end of the differential mode coil L1, and the other end of the differential mode coil L1 is connected with the output end of the noise reduction filter circuit. An electrolytic capacitor C1 is connected between the output end of the noise reduction filter circuit and the ground wire.
The noise reduction filter circuit adopting the structure increases the high-frequency common mode/differential mode impedance of the circuit and reduces the high-frequency noise by adding the common mode coil and serially cascading the two common mode coils, thereby reducing the high-frequency noise of the environmental noise.
The transformer space noise is obtained after the environmental noise is filtered by the noise reduction filter circuit, the space noise is subjected to signal enhancement by the signal enhancement circuit, and then the fault diagnosis early warning circuit is carried out.
As shown in fig. 4, the signal enhancement circuit performs signal enhancement processing by using spectral subtraction, first performs windowing processing and FFT transformation, then performs power spectrum correction and phase recovery, and finally performs IFFT transformation and windowed overlap-add. The signal enhancement circuit comprises a windowing module, an FFT module, a power spectrum correction module, a phase recovery module, an IFFT module and a windowing overlap-add module; the output end of the noise reduction filter circuit is connected with the windowing module, the output end of the windowing module is connected with the FFT module, the output end of the FFT module is connected with the power spectrum correction module, the output end of the power spectrum correction module is connected with the phase recovery module, the output end of the phase recovery module is connected with the IFFT module, and the output end of the IFFT module is connected with the windowing overlap-add module.
Performing signal enhancement processing by using a spectral subtraction method, performing windowing processing and FFT (fast Fourier transform), then performing power spectrum correction and phase recovery, and finally performing IFFT (inverse fast Fourier transform) and windowing overlap-add; combining the square calculation of the frequency spectrum in the power spectrum subtraction with the first-order calculation of the frequency spectrum in the amplitude spectrum subtraction, the method is improved into | · survival which is flexibly controlled by a coefficient 2 And (.) 1/2 And obtaining a corrected power spectrum through the power spectrum correction processing.
And the fault diagnosis early warning circuit diagnoses the space noise to obtain the fault type and early warns. Specifically, the fault diagnosis early warning circuit carries out spectrum analysis, extracts various characteristic parameters such as odd-even harmonic ratio, spectrum complexity and high-frequency energy ratio of the fault diagnosis early warning circuit, and combines parameters such as sound pressure level to realize effective discrimination and early warning of operation defects such as direct current magnetic biasing, harmonic load, accessory loosening, cooling device abrasion and discharge of the transformer.
The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. Transformer space noise detection circuitry, characterized by, includes:
a high performance microphone for receiving and detecting sound signals;
the noise reduction filter circuit is used for filtering environmental noise of the sound signal to obtain transformer space noise;
the signal enhancement circuit is used for carrying out signal enhancement on the space noise of the transformer;
the output end of the high-performance microphone is connected with a noise reduction filter circuit, the output end of the noise reduction filter circuit is connected with a signal enhancement circuit, and the output end of the signal enhancement circuit is connected with a fault diagnosis early warning circuit;
the high performance microphone adopts electret condenser measurement microphone, electret condenser measurement microphone includes the shell, the shell is groove structure, wherein the recess bottom sets up the through-hole, the inside open-ended cavity that is provided with of recess, the inboard of cavity sets up the diaphragm, the bottom of cavity sets up the back of the body utmost point of being connected with the cavity embedding, the opening part of cavity sets up the circuit board, circuit board and cavity are fixed and set up in the inside of shell all around.
2. The transformer space noise detection circuit of claim 1, wherein a spacer is disposed between the cavity and the diaphragm and between the cavity and the back electrode.
3. The transformer space noise detection circuit of claim 1, wherein a dust cover is disposed outside the recess.
4. The transformer space noise detection circuit of claim 1, wherein the noise reduction filter circuit comprises a first common mode coil, a second common mode coil, a differential mode coil; the output end of the first common mode coil is connected with the second common mode coil, and the output end of the second common mode coil is connected with the differential mode coil.
5. The transformer space noise detection circuit of claim 4, wherein an electrolytic capacitor is connected between the output end of the noise reduction filter circuit and a ground line.
6. The transformer spatial noise detection circuit of claim 1, wherein the signal enhancement circuit comprises a windowing module, an FFT module, a power spectrum modification module, a phase recovery module, an IFFT module, and a windowed overlap-add module; the output end of the noise reduction filter circuit is connected with a windowing module, the output end of the windowing module is connected with an FFT module, the output end of the FFT module is connected with a power spectrum correction module, the output end of the power spectrum correction module is connected with a phase recovery module, the output end of the phase recovery module is connected with an IFFT module, and the output end of the IFFT module is connected with a windowing overlap-add module.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220262054.5U CN217358737U (en) | 2022-02-09 | 2022-02-09 | Transformer space noise detection circuit |
| JP2022000537U JP3237232U (en) | 2022-02-09 | 2022-02-23 | Transformer space noise detection electrical circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220262054.5U CN217358737U (en) | 2022-02-09 | 2022-02-09 | Transformer space noise detection circuit |
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| CN217358737U true CN217358737U (en) | 2022-09-02 |
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| CN202220262054.5U Active CN217358737U (en) | 2022-02-09 | 2022-02-09 | Transformer space noise detection circuit |
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| JP (1) | JP3237232U (en) |
| CN (1) | CN217358737U (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115993503B (en) * | 2023-03-22 | 2023-06-06 | 广东电网有限责任公司东莞供电局 | Operation detection method, device and equipment of transformer and storage medium |
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- 2022-02-09 CN CN202220262054.5U patent/CN217358737U/en active Active
- 2022-02-23 JP JP2022000537U patent/JP3237232U/en active Active
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