CN102759689A - Device and method for measuring sudden/large-dynamic range partial discharge ultrasonic signal - Google Patents
Device and method for measuring sudden/large-dynamic range partial discharge ultrasonic signal Download PDFInfo
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- CN102759689A CN102759689A CN2012102000488A CN201210200048A CN102759689A CN 102759689 A CN102759689 A CN 102759689A CN 2012102000488 A CN2012102000488 A CN 2012102000488A CN 201210200048 A CN201210200048 A CN 201210200048A CN 102759689 A CN102759689 A CN 102759689A
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Abstract
The invention discloses a device for measuring a sudden/large-dynamic range partial discharge ultrasonic signal, which comprises four parallel liner measurement channels with different ranges, in addition, a logarithm measurement channel is also connected in parallel, wherein each channel comprises an A/D. The method comprises the steps of: S1, sending signals to the four liner measurement channels with different ranges after being amplified and filtered, and synchronously sampling and processing the signals by the A/D; S2, sending the amplified and filtered signals to the logarithm measurement channel, and synchronously sampling and processing the signals by the A/D; S3, in the step S2, if the sampling data exceeds the preset trigger level by at least continuous three times, stopping sampling after 19 milliseconds, storing the sampling data of the liner measurement channels with different ranges before and after triggering within 20 milliseconds, and selecting the sampling data with highest quantization accuracy as the final result. The device for measuring the sudden/large-dynamic range partial discharge ultrasonic signal is capable of accurately collecting a partial discharge ultrasonic signal, and is also capable of avoiding the problems of false triggering caused by noise and smaller signal missing.
Description
Technical field
The present invention relates to a kind of sudden/measurement mechanism of great dynamic range type local-discharge ultrasonic signal, be adapted to the high-acruracy survey of 100dB dynamic range shelf depreciation ultrasonic signal.The invention still further relates to the measuring method of the sudden/great dynamic range ultrasonic signal that adopts said device.
Background technology
The inner shelf depreciation of high voltage electric equipment can produce ultrasonic signal; This can be through being installed in the detection of a plurality of ultrasonic sensors realization shelf depreciation ultrasonic signals on the device housings; And can propagate into mistiming (shown in the waveform character figure of the shelf depreciation ultrasonic signal of Fig. 1) of a plurality of sensors according to ultrasonic signal; Utilize the method for space analysis geometry to calculate the happening part of shelf depreciation, thereby realize failure location.
Because the randomness of partial discharges fault; The ultrasonic signal that is produced has sudden and uncertainty intensity usually; The ultrasonic signal that sensor arrives is after preposition amplification of process and Filtering Processing; Output voltage signal can change between 0.1mV-10V usually, i.e. the dynamic range of measured signal can reach 100dB.
Guarantee the measuring accuracy of ultrasonic signal, except that selecting high-resolution A/D (modulus collector) for use, also should be according to the preset amount of measured signal suitable measurement range.For example, when the A/D that adopts 16Bit sampled to signal, the minimum quantization unit of 10V range was 10V/ (2
16)=0.16mV, if measured signal this moment is 1V, then quantization error is merely 0.016%.If but measured signal is merely 1mV, then quantization error will can not reflect the waveform character of measured signal truly up to 16%.
For the ultrasonic signal that shelf depreciation produced since have sudden, usually can't be according to the preset amount of signal suitable measurement range.If select less measurement range for use,, can't avoid the problem of signal no to scale though can improve the precision of signal quantization; Otherwise, if select bigger measurement range for use, can must can not reduce the quantified precision of signal again because of the outrange distortion though can guarantee measured signal, can't accurately obtain the waveform of measured signal.
In addition, the measurement of sudden signal need be adopted the sampling of triggering mode startup or end signal usually.For the bigger ultrasonic signal of dynamic range; Because of can't foreseeing the size of signal, thus traditional linear signal triggering mode be difficult to usually correctly set the suitable trigger level, if triggering level is low excessively; The site environment noise will cause the false triggering action of sampling and produce many invalid data; If triggering level is higher, then miss probably less signals sampling again, lose effective metrical information.
Summary of the invention
First technical matters to be solved by this invention, propose exactly a kind of sudden/measurement mechanism of great dynamic range type local-discharge ultrasonic signal.
Second technical matters to be solved by this invention, propose exactly a kind of sudden/measuring method of great dynamic range type local-discharge ultrasonic signal.
Apparatus and method of the present invention can select suitable measurement range accurately to capture the waveform character of shelf depreciation ultrasonic signal; Can also avoid simultaneously the sampling false triggering that the site environment noise causes and miss, help improving the location of partial discharges fault precision less signals sampling problem.
Solve above-mentioned first technical matters, the technical scheme that the present invention adopts is following:
A kind of sudden/measurement mechanism of great dynamic range type local-discharge ultrasonic signal; Comprise the ultrasonic sensor that connects successively, preposition amplification filtering processing module, measure passage and subsequent process circuit; Described measurement passage is the linear measurement passage with different ranges of at least 2 parallel connections; Measure in the passage and comprise the A/D analog to digital converter; It is characterized in that: described measurement passage also is parallel with one and from the linear measurement passage of different ranges, chooses the logarithm measurement passage that the sampled data with maximum quantization precision is a net result, and logarithm is measured in the passage and comprised the A/D analog to digital converter.
Described linear measurement passage is 4, and range is respectively 0-0.01V, 0-0.1V, 0-1V and 0-10V; The resolution of described A/D analog to digital converter is 16Bit, and the range that described logarithm is measured passage is 0-10V.
Solve above-mentioned second technical matters, the technical scheme that the present invention adopts is following:
A kind of measuring method that adopts the sudden/great dynamic range ultrasonic signal of said apparatus may further comprise the steps:
The S1 ultrasonic signal is delivered at least 2 linear measurement passages with different ranges respectively through after preposition amplification and the Filtering Processing, simultaneously these signals is sampled and handles with the A/D analog to digital converter;
The S2 ultrasonic signal is also delivered to logarithm and is measured passage through after preposition amplification and the Filtering Processing, this signal is sampled and handles with the A/D analog to digital converter;
S3 is in step S2; If sampled data continuous at least 3 times (can be provided with) surpasses predefined logarithm triggering level; Then continuing to stop sampling after a period of time 19 milliseconds (can be provided with); The sampled data of the linear measurement passage of different ranges in a period of time 20 milliseconds (can be provided with) before and after preserve triggering constantly, and therefrom to choose the sampled data with maximum quantization precision be net result.
Beneficial effect:
1, the signals sampling precision can be in the 100dB dynamic range, guaranteed, the waveform character of shelf depreciation ultrasonic signal can be truly reflected.For example, be merely the tiny signal of 1mV, will select for use 0-0.01V linear measurement passage to carry out data sampling automatically, because the quantization unit of the analog to digital converter of 16Bit resolution is 0.01V/2 for a peak value
16=0.00016mV, so the time quantization error of signal is merely 0.016%, the resolution that improves analog to digital converter also can further improve measuring accuracy.
2, can be in the 100dB dynamic range triggering sampled level of signalization, and can effectively suppress the false triggering phenomenon that the spike pulse noise is caused, improve capturing ability to great dynamic range, sudden shelf depreciation ultrasonic signal.
Description of drawings
Fig. 1 be of the present invention sudden/the composition knot synoptic diagram of the measurement mechanism embodiment of great dynamic range type local-discharge ultrasonic signal;
Fig. 2 be of the present invention sudden/the measurement process flow diagram of the measurement mechanism embodiment of great dynamic range type local-discharge ultrasonic signal;
Fig. 3 be of the present invention sudden/the triggering process flow diagram of the measurement mechanism embodiment of great dynamic range type local-discharge ultrasonic signal.
Embodiment
As shown in Figure 1; Of the present invention sudden/the device for accurately measuring embodiment of great dynamic range ultrasonic signal; Comprise the ultrasonic sensor that connects successively, preposition amplification filtering processing module, measure passage and subsequent process circuit; Measuring passage is the linear measurement passage with different ranges of 4 parallel connections, and range is respectively 0-0.01V, 0-0.1V, 0-1V and 0-10V; Comprise the A/D analog to digital converter in the measurement passage, the resolution of A/D analog to digital converter is 16Bit; The measurement passage also is parallel with one and from the linear measurement passage of different ranges, chooses the logarithm measurement passage that the sampled data with maximum quantization precision is a net result, and logarithm is measured in the passage and also comprised the A/D analog to digital converter.
Adopt the measuring method of the sudden/great dynamic range ultrasonic signal of said apparatus, may further comprise the steps:
The S1 ultrasonic signal is after preposition amplification of process and Filtering Processing; Deliver to the linear measurement passage that 0-0.01V, 0-0.1V, 0-1V and four of 0-10V have different ranges respectively, simultaneously these signals are sampled and handle with the A/D (analog to digital converter) of 16Bit resolution;
The S2 ultrasonic signal is after preposition amplification of process and Filtering Processing; Deliver to the 0-10V logarithm and measure passage; This signal is sampled and handle with the A/D (analog to digital converter) of 16Bit resolution; If sampled data continuous several times (can be provided with) surpasses predefined logarithm triggering level; Then after continuing a period of time with automatic stop signal sampling, preserve before and after triggering constantly the sampled data of 4 linear measurement passages in a period of time, and therefrom to choose the sampled data with maximum quantization precision be net result.Because logarithmetics is handled can compress large-signal effectively, promote small-signal; Improve the range of dynamic measurement of output signal; And can effectively suppress the false triggering phenomenon that the spike pulse noise is caused; So triggering level can be set in the 100dB scope easily, and possess the function of anti-spike pulse noise, can effectively improve the sampling reliability when catching small-signal.But because the serious distortion of the meeting of the wave-shape amplitude after logarithm is handled so this method is only applicable to the triggering of signal, can not be used for the measurement of ultrasonic signal waveform;
S3 is in step S2; If sampled data continuous at least 3 times (can be provided with) surpasses predefined logarithm triggering level; Then continuing to stop sampling after a period of time 19 milliseconds (can be provided with); The sampled data of the linear measurement passage of different ranges in a period of time 20 milliseconds (can be provided with) before and after preserve triggering constantly; And therefrom to choose the sampled data with maximum quantization precision be net result, and the amplitude of also promptly choosing is the highest and surpass the sampled data of range, can in the 100dB dynamic range, guarantee the higher signal quantified precision.
For example, if the peak value of measured signal between 1-10V, then will select for use 0-10V to measure the sampled data of passage; If between 0.1-1V, then can select the sampled data of 0-1V for use; If between 0.01-0.1V, then can select the sampled data of 0-0.1V for use; If between 0.001-0.01V, then can select the sampled data of 0-0.01V for use, to select for use under the ideal situation of consideration of noise not, above-mentioned signals sampling all can obtain 0.016% quantified precision, obviously is superior to traditional fixedly range metering system.
Claims (3)
1. the measurement mechanism of sudden/great dynamic range type local-discharge ultrasonic signal; Comprise the ultrasonic sensor that connects successively, preposition amplification filtering processing module, measure passage and subsequent process circuit; Described measurement passage is the linear measurement passage with different ranges of at least 2 parallel connections; Measure in the passage and comprise the A/D analog to digital converter; It is characterized in that: described measurement passage also is parallel with one and from the linear measurement passage of different ranges, chooses the logarithm measurement passage that the sampled data with maximum quantization precision is a net result, and logarithm is measured in the passage and comprised the A/D analog to digital converter.
2. according to claim 1 sudden/measurement mechanism of great dynamic range type local-discharge ultrasonic signal, it is characterized in that: described linear measurement passage is 4, and range is respectively 0-0.01V, 0-0.1V, 0-1V and 0-10V; The resolution of described A/D analog to digital converter is 16Bit, and the range that described logarithm is measured passage is 0-10V.
3. the measuring method of the sudden/great dynamic range ultrasonic signal of employing device according to claim 1 or claim 2 may further comprise the steps:
The S1 ultrasonic signal is delivered at least 2 linear measurement passages with different ranges respectively through after preposition amplification and the Filtering Processing, simultaneously these signals is sampled and handles with the A/D analog to digital converter;
The S2 ultrasonic signal is also delivered to logarithm and is measured passage through after preposition amplification and the Filtering Processing, this signal is sampled and handles with the A/D analog to digital converter;
S3 is in step S2; If sampled data surpasses predefined logarithm triggering level continuous at least 3 times; Then continuing to stop sampling after 19 milliseconds of a period of times; The sampled data of the linear measurement passage of different ranges in 20 milliseconds of a period of times before and after preserve triggering constantly, and therefrom to choose the sampled data with maximum quantization precision be net result.
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Application publication date: 20121031 |