CN1346985A - Digital statistic information method for measuring ultra-long local discharge - Google Patents
Digital statistic information method for measuring ultra-long local discharge Download PDFInfo
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Abstract
A method for measuring the digital statistical information about local discharge within very long time includes regulating amplitude and phase of in-situ signals, differentiating amplifying to remove strong interference signals, filtering, logarithmic amplifying, amplitude regulation, A/D conversion, data compression and storing the compressed data in memory of computer. Its advantage is use of A/D conversion to simplify hardware greatly.
Description
Technical field:
The present invention relates to a kind of digital statistic information method for measuring ultra-long local discharge, belong to electrical equipment technical field.
Background technology:
Utilize intelligence tool such as artificial neural network that discharge signal is carried out pattern-recognition, can differentiate position and intensity that discharge takes place, for the state of insulation of equipment provides more criterion.
But the electric equipment local discharge signal has randomness, needs once to gather to reach tens of seconds discharge signal, with the required statistical parameters such as discharge capacity, discharge phase and discharge repetition rate of acquisition model identification.General digital partial-discharge measuring device is owing to be subjected to the restriction of A/D card buffer memory capacity and data storage method, can not long-time continuous ground image data, influenced The result of statistics.
The GENGUARD generator local discharge monitoring device that Canada IRIS company produces adopts hardware comparator and hardware counter to measure discharge capacity and discharge repetition rate, by the relation of Computer Processing AC power phase place and pulse recurrence rate, pulse amplitude.Its longest acquisition time is 5 seconds, and amplitude window number is 32, and the phase window number is 24.The shortcoming of this device is: the amplitude resolution and the phase resolution of this device are lower, can only gather 5 seconds shelf depreciation data at most at every turn.The hardware circuit complexity need be made up of a large amount of comparer sum counters in addition.The import price costliness is overlapped 610,000 yuan of installation costs, 150,000 yuan of Installation and Debugging expenses as nearest Fujian import one in addition.
Summary of the invention:
The objective of the invention is to propose a kind of digital statistic information method for measuring ultra-long local discharge, so that be the instrument of power department development based on this method, thus import substitutes.
The digital statistic information method for measuring ultra-long local discharge that the present invention proposes comprises following each step:
1, the mixing the local discharge signal that various high reject signals are arranged and only contain interference signals and carry out amplitude adjustment and phase place adjustment respectively of measure field, disturb suppressing to greatest extent, improve signal to noise ratio (S/N ratio).
2, above-mentionedly carry out difference through the two paths of signals of amplitude adjustment and phase place adjustment respectively and amplify, remove high reject signal wherein, only keep local discharge signal.
3, above-mentioned discharge signal is carried out filtering, improve signal to noise ratio (S/N ratio) with further inhibition undesired signal.
4, above-mentioned signal through filtering is carried out the logarithm amplification and makes the signal that last amplitude adjustment is met A/D conversion input range.
5, above-mentioned signal after logarithm amplifies is carried out analog to digital conversion, analog signal conversion is become digital signal.
6, above-mentioned digital signal is carried out compression storing data and handle, be temporarily stored in real time in the internal memory of computing machine, be the statistical information of shelf depreciation.
The D conversion method in the 5th step in the said method comprises following each step:
(1) discharge signal that amplifies through logarithm and do the amplitude adjustment is carried out peak value and keep, carry out the A/D conversion then under the control of control signal, conversion is carried out in the starting point of each power frequency period.
(2) carry out dividing potential drop to being applied to, obtain the power frequency low-voltage signal by the high voltage on the test agent.
(3) above-mentioned power-frequency voltage signal is carried out shaping, it is transformed to power frequency square wave voltage signal with the Transistor-Transistor Logic level compatibility.
(4) utilize phase-locked loop method that above-mentioned power frequency square wave voltage signal is converted to the fixedly time clock of multiplying power;
(5) above-mentioned time clock is converted into two path control signal, and wherein one tunnel control peak value keeps, and the A/D conversion of the above-mentioned first step is controlled on another road.
The compression storing data disposal route in the 6th step comprises following each step in the said method;
Digital signal after analog to digital conversion is stored as follows:
(1) storage space is regarded as a two dimensional surface, this plane is divided into several cells, each cell is equivalent to a storage repository, and the transverse axis variable is the phase place that adds power-frequency voltage, and numerical range is 0 to 360 degree, corresponding power frequency period; Transverse axis is divided into some row, and the corresponding phase range of each row is called phase window, and the concrete quantity of phase window is determined by the A/D conversion method; Longitudinal axis variable is a discharge capacity, and transverse axis reflects positive and negative polarity discharge up and down respectively; Corresponding discharge capacity scope of each row along the longitudinal axis is called the amplitude window, and amplitude window number is determined by the A/D conversion resolution.
(2) storage of data is carried out in real time, at first make the zero phase of the starting point of A/D conversion corresponding to power-frequency voltage, the multiple relation that the sampling rate that makes A/D conversion and power frequency are maintained fixed, i.e. phase window number, the order of data sequence is automatically corresponding to each phase window position at this moment; And the result of each A/D conversion, the position of the positive and negative and big or small automatic corresponding amplitude window of its numerical value increases one with the data accumulation in the opposite depot then and gets final product.So, the data in the warehouse have just reflected the number of times of discharge; According to the time of image data, just can obtain the discharge repetition rate of a certain phase place, time window.
In the said method, different power frequency periods but the discharge information of same position are stored in the same storage repository, because the data length in selected each storage repository is two bytes, so storage repository array, the discharge data that can hold 65536 power frequency periods in theory at most, time corresponding length are 1310 seconds.The characteristics of this storage mode are: no matter be to gather a power frequency period or 65536 power frequency periods, the capacity of storer all is the 512k byte.
The method for measurement of partial discharge that the inventive method proposes can long-time continuous detect discharge signal, and the vast capacity information of acquisition is the basis of discharge signal digitized processing; This method adopts the A/D conversion method to replace simulating comparative approach and simulation method of counting, can make based on the hardware circuit of the device of this method and simplify greatly, and amplitude resolution and phase resolution have obtained significantly improving, apparently higher than external like product; The longest uninterrupted acquisition time of this method is 20ms---1310s, can be provided with arbitrarily as required, phase window resolution is 1024,512,256,128,64,32, can be provided with as required, for the A/D conversion of 8 bit resolutions, 5V full scale, amplitude resolution is 256, and every step voltage scope is 19.5mV.Apparatus structure based on this method preparation is simple, and used components and parts are based on our country, and cost only is five minutes of import price, is convenient to promote at home; Utilization has been carried out partial discharge test based on the instrument of this method in the laboratory, obtained satisfied result.
Description of drawings:
Fig. 1 is a measuring method theory diagram of the present invention.
Fig. 2 is a D conversion method theory diagram of the present invention.
Fig. 3 is the data warehouse array schematic diagram of this method.
Embodiment:
Using this method tests the corona discharge model.Following steps are adopted in test:
1, discharge signal and undesired signal signal mixed in together and only contain interference signals and carry out phase place adjustment and amplitude adjustment respectively carries out differential amplification then, carries out logarithm again and amplifies with further adjustment amplitude.
2, under the control of power frequency external trigger signal, the signal after amplifying through logarithm is carried out analog to digital conversion by the A/D conversion method.The resolution that adopts in the A/D conversion method is 8.
3, A/D being changed resulting digital signal adopts the method for data compression to store.The number of amplitude window adopts 256.Phase window has adopted 1024, to obtain the precise information of each phase place.Collection T.T. length is 1500 power frequency periods (30 seconds).
4, the data after the compressed storage are the statistics of shelf depreciation, can be used for analyses such as artificial neural network, 3 dimension spectrogram fingerprint recognition, for PD Pattern Recognition provides foundation.
Claims (3)
1, a kind of digital statistic information method for measuring ultra-long local discharge is characterized in that this method comprises following each step:
(1) the mixing the local discharge signal that various high reject signals are arranged and only contain interference signals and carry out amplitude adjustment and phase place adjustment respectively of measure field, disturb suppressing to greatest extent, improve signal to noise ratio (S/N ratio);
(2) carry out difference through the two paths of signals of amplitude adjustment and phase place adjustment respectively and amplify above-mentioned, remove high reject signal wherein, only keep local discharge signal;
(3) above-mentioned discharge signal is carried out filtering, improve signal to noise ratio (S/N ratio) with further inhibition undesired signal;
(4) above-mentioned signal through filtering is carried out logarithm and amplify, and make the signal that last amplitude adjustment is met A/D conversion input range;
(5) above-mentioned signal after logarithm amplifies is carried out analog to digital conversion, analog signal conversion is become digital signal;
(6) above-mentioned digital signal is carried out compression storing data and handle, be temporarily stored in real time in the internal memory of computing machine, be the statistical information of shelf depreciation.
2, the method for claim 1 is characterized in that the wherein D conversion method in the 5th step, comprises following each step:
(1) discharge signal that amplifies through logarithm and do the amplitude adjustment is carried out peak value and keep, carry out the A/D conversion then under the control of control signal, conversion is carried out in the starting point of each power frequency period;
(2) carry out dividing potential drop to being applied to, obtain the power frequency low-voltage signal by the high voltage on the test agent;
(3) above-mentioned power-frequency voltage signal is carried out shaping, it is transformed to power frequency square wave voltage signal with the Transistor-Transistor Logic level compatibility;
(4) with phase-locked loop method above-mentioned power frequency square wave voltage signal is converted to the fixedly time clock of multiplying power;
(5) state time clock and be converted into two path control signal, wherein one tunnel control peak value keeps, and the A/D conversion of the above-mentioned first step is controlled on another road.
3, the method for claim 1 is characterized in that the wherein compression storing data disposal route in the 6th step, comprises following each step;
(1) storage space is regarded as a two dimensional surface, this plane is divided into several cells, each cell is equivalent to a storage repository, and the transverse axis variable is the phase place that adds power-frequency voltage, and numerical range is 0 to 360 degree, corresponding power frequency period; Transverse axis is divided into some row, and the corresponding phase range of each row is called phase window, and the concrete quantity of phase window is determined by the A/D conversion method; Longitudinal axis variable is a discharge capacity, and transverse axis reflects positive and negative polarity discharge up and down respectively; Corresponding discharge capacity scope of each row along the longitudinal axis is called the amplitude window, and amplitude window number is determined by the A/D conversion resolution;
Make the zero phase of the starting point of A/D conversion, and the multiple that is maintained fixed of the sampling rate that makes the A/D conversion and power frequency corresponding to power-frequency voltage, i.e. phase window number, the order of data sequence is automatically corresponding to each phase window position at this moment; The result of each A/D conversion, the position of the positive and negative and big or small automatic corresponding amplitude window of its numerical value increases one with the data accumulation in the opposite depot then.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101949998A (en) * | 2010-09-10 | 2011-01-19 | 致茂电子(苏州)有限公司 | Corona sensing device and method and voltage resistance tester |
| CN102474092A (en) * | 2009-07-31 | 2012-05-23 | 株式会社东芝 | Protection control monitoring device |
| CN101788582B (en) * | 2010-02-03 | 2012-07-04 | 华北电力大学 | Interference suppression method and device for local discharge detection of equipment |
| CN102540023A (en) * | 2011-12-13 | 2012-07-04 | 上海电机系统节能工程技术研究中心有限公司 | Device for detecting partial discharge signal of insulating structure |
| CN102132164B (en) * | 2008-07-14 | 2013-09-25 | 电力系统分析技术股份有限公司 | Apparatus for removing the partial discharge noise of an electrical power facility and apparatus for detecting a partial discharge generated section |
| CN104483602A (en) * | 2014-11-28 | 2015-04-01 | 北京兴迪仪器有限责任公司 | Local discharge signal identification method and device |
| CN106461721A (en) * | 2014-04-23 | 2017-02-22 | 东芝三菱电机产业系统株式会社 | Partial discharge measurement device |
| CN112731081A (en) * | 2020-12-25 | 2021-04-30 | 国网山东省电力公司电力科学研究院 | Method and device for acquiring partial discharge phase |
| CN113406453A (en) * | 2021-06-30 | 2021-09-17 | 平顶山学院 | MCU-based PRPD/PRPS map data processing method and detection device |
-
2001
- 2001-09-28 CN CN 01141611 patent/CN1346985A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102132164B (en) * | 2008-07-14 | 2013-09-25 | 电力系统分析技术股份有限公司 | Apparatus for removing the partial discharge noise of an electrical power facility and apparatus for detecting a partial discharge generated section |
| CN102474092A (en) * | 2009-07-31 | 2012-05-23 | 株式会社东芝 | Protection control monitoring device |
| CN102474092B (en) * | 2009-07-31 | 2014-08-27 | 株式会社东芝 | Protection control monitoring device |
| CN101788582B (en) * | 2010-02-03 | 2012-07-04 | 华北电力大学 | Interference suppression method and device for local discharge detection of equipment |
| CN101949998A (en) * | 2010-09-10 | 2011-01-19 | 致茂电子(苏州)有限公司 | Corona sensing device and method and voltage resistance tester |
| CN101949998B (en) * | 2010-09-10 | 2012-10-10 | 致茂电子(苏州)有限公司 | Corona sensing device and method and voltage resistance tester |
| CN102540023A (en) * | 2011-12-13 | 2012-07-04 | 上海电机系统节能工程技术研究中心有限公司 | Device for detecting partial discharge signal of insulating structure |
| CN106461721A (en) * | 2014-04-23 | 2017-02-22 | 东芝三菱电机产业系统株式会社 | Partial discharge measurement device |
| CN104483602A (en) * | 2014-11-28 | 2015-04-01 | 北京兴迪仪器有限责任公司 | Local discharge signal identification method and device |
| CN112731081A (en) * | 2020-12-25 | 2021-04-30 | 国网山东省电力公司电力科学研究院 | Method and device for acquiring partial discharge phase |
| CN113406453A (en) * | 2021-06-30 | 2021-09-17 | 平顶山学院 | MCU-based PRPD/PRPS map data processing method and detection device |
| CN113406453B (en) * | 2021-06-30 | 2023-06-23 | 平顶山学院 | PRPD/PRPS map data processing method and detection device based on MCU |
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