CN214310747U - Power cable fault positioning device - Google Patents
Power cable fault positioning device Download PDFInfo
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- CN214310747U CN214310747U CN202023245104.9U CN202023245104U CN214310747U CN 214310747 U CN214310747 U CN 214310747U CN 202023245104 U CN202023245104 U CN 202023245104U CN 214310747 U CN214310747 U CN 214310747U
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Abstract
The utility model relates to a power cable fault positioning device, including host computer and host computer, host computer and host computer pass through USB OTG and connect, the host computer include electromagnetic induction sensor, piezoelectric sensor, first filter circuit, amplifier circuit, second filter circuit, accurate rectifier circuit, AD converting circuit and lower DSP processing module; the upper computer comprises an upper DSP processing module, a display module and an audio output module, and the audio output module is connected with the earphone. The utility model discloses sound signal and electromagnetic signal to receiving in the testing process carry out twice filtration processing, once enlarge processing and once accurate rectification and handle, can filter the interfering signal who detach in the testing process effectively, can effectual improvement detect the volume degree of accuracy and sensitivity, this device is simple reliable moreover, and is with low costs, convenient operation.
Description
Technical Field
The utility model relates to a power cable fault locating device belongs to cable fault detection field.
Background
With the continuous development of urban infrastructure construction in China, the number of buried power cables is more and more, the position distribution is more and more complex, the power cables are difficult to avoid to break down with the increase of the service time, and when the power cables break down, the positions of fault points need to be detected quickly and accurately and then repaired to reduce the influence of power failure on the production and life of people as much as possible.
Because the positions of the power cable buried underground are complex and various, accurate fixed-point detection of the power cable fault by adopting an acoustic-magnetic synchronization method usually needs to detect an impact discharge sound signal generated by breakdown of the fault point, the detection environment often contains complex background noise, even the impact discharge sound signal is buried in the background noise, and the traditional filtering method is difficult to effectively remove the background noise, so that the filtering and enhancing of the impact discharge sound signal under the low signal-to-noise ratio non-stationary background noise is a difficult point in the cable fault accurate positioning technology. In the prior art, the signals are filtered and amplified once, so that the detection and positioning are inaccurate.
SUMMERY OF THE UTILITY MODEL
The utility model provides a power cable fault location device has solved among the current cable fault location process signal interference serious, leads to the unsafe problem of its testing result.
In order to solve the technical problem, the utility model discloses a technical scheme does:
a power cable fault positioning device comprises a lower computer and an upper computer, wherein the upper computer and the lower computer are connected through a USB OTG,
the lower computer comprises an electromagnetic induction sensor, a piezoelectric sensor, a first filter circuit, an amplifying circuit, a second filter circuit, a precise rectifying circuit, an A/D conversion circuit and a lower DSP processing module;
the upper computer comprises an upper DSP processing module, a display module and an audio output module, and the audio output module is connected with the earphone;
the electromagnetic induction sensor is used for collecting the impact magnetic field signal of the cable fault point,
the piezoelectric sensor is used for collecting the discharge sound of a cable fault point,
the first filter circuit is used for respectively detecting interference signals in sound signals and electromagnetic signals generated by a fault point during discharge breakdown by using the filtering elimination sound sensor and the electromagnetic sensor;
the amplifying circuit is used for amplifying the weak high-frequency signals left after the filtering of the first filter circuit;
the second filter circuit is used for filtering out interference caused by thermal noise generated by the amplifying circuit device to the signal;
the precise rectification circuit is used for precisely rectifying the signal filtered out for the second time into a direct current signal;
the A/D conversion circuit is used for performing digital-to-analog conversion on the direct current signal output by the precision rectification circuit and converting the direct current signal into a digital signal;
the lower DSP processing module is connected with the upper DSP processing module through a USB OTG bus, and after the lower DSP processing module processes data, the processing result is transmitted to the upper DSP processing module through the USB OTG bus, and meanwhile, the final processing result is displayed through the display module, and the processed impact discharge sound signal is played on the earphone through the audio output module.
Preferably: the lower computer further comprises a data memory and an acceleration sensor, and the data memory and the acceleration sensor are respectively connected with the lower DSP processing module.
Preferably: the upper computer also comprises a data memory, and the data memory is connected with the lower DSP processing module.
Preferably: the display module is an LCD module.
The utility model has the advantages that:
the utility model discloses sound signal and electromagnetic signal to receiving in the testing process carry out twice filtration processing, once enlarge processing and once accurate rectification and handle, can filter the interfering signal who detach in the testing process effectively, can effectual improvement detect the volume degree of accuracy and sensitivity, this device is simple reliable moreover, and is with low costs, convenient operation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be 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 inventive exercise.
Fig. 1 is a block diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in 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 efforts belong to the protection scope of the present invention.
As shown in fig. 1, a power cable fault locating device includes a lower computer and an upper computer, where the upper computer and the lower computer are connected through a USB OTG bus.
The lower computer comprises an electromagnetic induction sensor, a piezoelectric sensor, a first filter circuit, an amplifying circuit, a second filter circuit, a precise rectifying circuit, an A/D conversion circuit and a lower DSP processing module;
the upper computer comprises an upper DSP processing module, a display module and an audio output module, and the audio output module is connected with the earphone;
the electromagnetic induction sensor is used for collecting the impact magnetic field signal of the cable fault point,
the piezoelectric sensor is used for collecting the discharge sound of a cable fault point,
the first filter circuit is used for respectively detecting interference signals in sound signals and electromagnetic signals generated by a fault point during discharge breakdown by using the filtering elimination sound sensor and the electromagnetic sensor;
the amplifying circuit is used for amplifying the weak high-frequency signals left after the filtering of the first filter circuit;
the second filter circuit is used for filtering out interference caused by thermal noise generated by the amplifying circuit device to the signal;
the precise rectification circuit is used for precisely rectifying the signal filtered out for the second time into a direct current signal;
the A/D conversion circuit is used for performing digital-to-analog conversion on the direct current signal output by the precision rectification circuit and converting the direct current signal into a digital signal;
the lower DSP processing module is connected with the upper DSP processing module through a USB OTG bus, and after the lower DSP processing module processes data, the processing result is transmitted to the upper DSP processing module through the USB OTG bus, and meanwhile, the final processing result is displayed through the display module, and the processed impact discharge sound signal is played on the earphone through the audio output module. The lower DSP processing module and the lower DSP processing module both adopt an ADSP-BF525 processor.
The lower computer further comprises a data memory and an acceleration sensor, and the data memory and the acceleration sensor are respectively connected with the lower DSP processing module. The data memory is used for storing data and adopts AT25DF 321. The acceleration sensor is used for judging whether the lower computer moves or not, and ADXL345 is adopted.
The upper computer further comprises a data memory, and the data memory is connected with the lower DSP processing module.
The display module is an LCD module.
The utility model discloses an operation process:
the electromagnetic induction sensor and the piezoelectric sensor receive impact discharge information, namely impact discharge sound signals and magnetic field signals, generated by detecting cable fault points through coils, and the impact discharge sound signals and the magnetic field signals acquire cable fault point impact magnetic field signals, wherein the detected signals have a plurality of interference signals; interference is eliminated through filtering of the first filter circuit, a part of low-frequency strong signals are deleted, and weak high-frequency signals are left; performing square and large processing on the high-frequency signal, filtering again to remove the signal of the amplifying circuit, and performing precise rectification on the signal obtained by secondary filtering to obtain a direct-current signal, wherein the amplifying circuit device possibly generates thermal noise to cause interference on the signal; the direct current signal from the precision rectification circuit is subjected to digital-to-analog conversion by the A/D conversion circuit and converted into a digital signal.
The lower DSP processing module is connected with the upper DSP processing module through a USB OTG bus, and after the lower DSP processing module processes data, the processing result is transmitted to the upper DSP processing module through the USB OTG bus, and meanwhile, the final processing result is displayed through the display module, and the processed impact discharge sound signal is played on the earphone through the audio output module.
The utility model discloses sound signal and electromagnetic signal to receiving in the testing process carry out twice filtration processing, once enlarge processing and once accurate rectification and handle, can filter the interfering signal who detach in the testing process effectively, can effectual improvement detect the volume degree of accuracy and sensitivity, this device is simple reliable moreover, and is with low costs, convenient operation.
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 (4)
1. The utility model provides a power cable fault locating device which characterized in that: comprises a lower computer and an upper computer, the upper computer and the lower computer are connected through a USB OTG,
the lower computer comprises an electromagnetic induction sensor, a piezoelectric sensor, a first filter circuit, an amplifying circuit, a second filter circuit, a precise rectifying circuit, an A/D conversion circuit and a lower DSP processing module;
the upper computer comprises an upper DSP processing module, a display module and an audio output module, and the audio output module is connected with the earphone;
the electromagnetic induction sensor is used for collecting the impact magnetic field signal of the cable fault point,
the piezoelectric sensor is used for collecting the discharge sound of a cable fault point,
the first filter circuit is used for respectively detecting interference signals in sound signals and electromagnetic signals generated by a fault point during discharge breakdown by using the filtering elimination sound sensor and the electromagnetic sensor;
the amplifying circuit is used for amplifying the weak high-frequency signals left after the filtering of the first filter circuit;
the second filter circuit is used for filtering out interference caused by thermal noise generated by the amplifying circuit device to the signal;
the precise rectification circuit is used for precisely rectifying the signal filtered out for the second time into a direct current signal;
the A/D conversion circuit is used for performing digital-to-analog conversion on the direct current signal output by the precision rectification circuit and converting the direct current signal into a digital signal;
the lower DSP processing module is connected with the upper DSP processing module through a USB OTG bus, and after the lower DSP processing module processes data, the processing result is transmitted to the upper DSP processing module through the USB OTG bus, and meanwhile, the final processing result is displayed through the display module, and the processed impact discharge sound signal is played on the earphone through the audio output module.
2. A power cable fault location device according to claim 1, wherein: the lower computer further comprises a data memory and an acceleration sensor, and the data memory and the acceleration sensor are respectively connected with the lower DSP processing module.
3. A power cable fault location device according to claim 1, wherein: the upper computer also comprises a data memory, and the data memory is connected with the lower DSP processing module.
4. A power cable fault location device according to any one of claims 1-3, wherein: the display module is an LCD module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023245104.9U CN214310747U (en) | 2020-12-29 | 2020-12-29 | Power cable fault positioning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023245104.9U CN214310747U (en) | 2020-12-29 | 2020-12-29 | Power cable fault positioning device |
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| Publication Number | Publication Date |
|---|---|
| CN214310747U true CN214310747U (en) | 2021-09-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023245104.9U Active CN214310747U (en) | 2020-12-29 | 2020-12-29 | Power cable fault positioning device |
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|---|---|
| CN (1) | CN214310747U (en) |
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- 2020-12-29 CN CN202023245104.9U patent/CN214310747U/en active Active
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