CN104111375A - Frequency selection method of receiving frequency of in-air device insulating internal discharge detection system - Google Patents
Frequency selection method of receiving frequency of in-air device insulating internal discharge detection system Download PDFInfo
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- CN104111375A CN104111375A CN201410319085.XA CN201410319085A CN104111375A CN 104111375 A CN104111375 A CN 104111375A CN 201410319085 A CN201410319085 A CN 201410319085A CN 104111375 A CN104111375 A CN 104111375A
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Abstract
The invention relates to the field of in-air device insulating internal discharge detection and specifically relates to a frequency selection method of a receiving frequency of an in-air device insulating internal discharge detection system. The method includes the following steps: acquiring time domain signals in a full-frequency-band manner; carrying out Fourier analysis on the time domain signals according to frequency bands so as to obtain frequency domain signals; dividing a 30-1800 MHz frequency band into four frequency bands: 30-100MHz, 100-300MHz, 300-900MHz and 900-1800MHz frequency bands so as to judge the amplitudes of interference signals of the frequency bands and then obtaining a frequency band with the minimum amplitude of interference signals and if the amplitudes of interference signals of two frequency bands are identical, selecting a frequency band with a higher frequency as a frequency band with the minimum amplitude of interference signals; and selecting a frequency point with a highest signal to noise ratio from the frequency band with the minimum amplitude of interference signals as a receiving frequency of discharge signals. The method adopts a method of firstly screening an appropriate frequency band and then screening an appropriate receiving frequency point from the screened frequency band to receive discharge signals to eliminate frequency bands which are not suitable for receiving the discharge signals so that clearest discharge signals can be obtained and the positioning precision of the discharge signals are enabled to become higher.
Description
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Technical field
The present invention relates to apparatus insulated internal discharge monitoring field, the particularly frequency-selecting method of apparatus insulated internal discharge visual detection system receive frequency in a kind of air in air.
Background technology
All kinds of power transmission and transformation primary equipments in conventional substation, comprise that GIS outlet casing tube, transformer high-voltage bushing, SF6 isolating switch, mutual inductor, capacitor, lightning arrester, insulator etc. occur can producing shelf depreciation before insulation fault.According to incompletely statistics, in the accident of existing record, account for very large ratio by the caused accident of power transmission and transformation primary equipment fault, and shelf depreciation is the one of the main reasons that causes its fault, also be important sign and the form of expression of insulation degradation, therefore the further investigation of shelf depreciation become gradually the important topic of vast researcher.
In addition, we also will take into account the problem of positioning precision.Receiving, resolving is to obtain delay inequality according to the rising edge comparison time delay of carrier frequency to position and resolve, require the rising edge of receive frequency more suddenly better, be that signal amplitude is the bigger the better, namely signal energy value is more high better, but also will consider positioning precision, the receive frequency of positioning precision and signal is in close relations, if positioning precision is 1 meter, need the rising edge of receive frequency to be less than 3ns, be folded to the about 75MHz of frequency; If positioning precision is 0.3 meter, need the rising edge of receive frequency to be less than 1ns, be folded to the about 250MHz of frequency, receive frequency is greater than 250MHz and could meets the technical requirement that positioning precision is greater than 0.3 meter.Receive clear discharge signal, also will consider the amplitude that can receive discharge signal.Discharge signal amplitude in the time that frequency is less than 30MHz is larger, signal energy value is high, but the undesired signal in this band frequency is too many, signal to noise ratio (S/N ratio) is too low, cannot obtain discharge signal clearly, along with the raising of receive frequency, the signal amplitude receiving reduces gradually, energy value is little, but within the scope of this band frequency, has the region that signal to noise ratio (S/N ratio) is higher, can obtain discharge signal more clearly.We should consider to receive the signal to noise ratio (S/N ratio) of signal, consider to receive again the amplitude of signal, the processing of compromising.To this, this just requires screening to meet the receive frequency of above-mentioned standard, obtains optimum efficiency with this.
Determining of some signal need to be used frequency domain method, but frequency domain method belongs to a kind of initiatively receive mode, receive by set frequency, but because the frequency range of discharge signal is wider, therefore receive obviously improperly with frequency domain method, do not receive discharge signal clearly.
Summary of the invention
Technical purpose of the present invention is to overcome the problems of the prior art, provide a kind of and take into account signal to noise ratio (S/N ratio) and the signal energy value that receives, thereby can receive the most clear discharge signal and then can realize the frequency-selecting method of apparatus insulated internal discharge detection system receive frequency in the pinpoint air of discharge signal.
For realizing object of the present invention, the technical solution used in the present invention is: the frequency-selecting method of apparatus insulated internal discharge detection system receive frequency in a kind of air, comprises the following steps:
A. full frequency band gathers time-domain signal;
B. described time-domain signal frequency-division section is done to Fourier analysis, obtain frequency-region signal;
C. 30-1800MHz frequency range is divided into the amplitude size that 30-100MHz, 100-300 MHz, 300-900 MHz and tetra-frequency ranges of 900-1800MHz judge each band interference signal, obtain the frequency range of interference signal amplitude minimum, if two band interference signal amplitudes are identical, select frequency range that frequency range the is high frequency range as interference signal amplitude minimum;
D. in the frequency range of interference signal amplitude minimum, select frequency that signal to noise ratio (S/N ratio) the is the highest receive frequency as discharge signal.
The frequency-selecting method of apparatus insulated internal discharge detection system receive frequency in aforesaid a kind of air, in step c, the interference signal amplitude using the interference signal amplitude value of amplitude maximum in each frequency range in four frequency ranges as this frequency range.
The frequency-selecting method of apparatus insulated internal discharge detection system receive frequency in aforesaid a kind of air, in step c, when the interference signal amplitude of two frequency ranges in four frequency ranges is poor while being less than or equal to 6dB, determines that two band interference signal amplitudes are identical.
The frequency-selecting method of apparatus insulated internal discharge detection system receive frequency in aforesaid a kind of air, in step a, sampling rate is 10-20G.
The frequency-selecting method of apparatus insulated internal discharge detection system receive frequency in aforesaid a kind of air, in step a, sampling rate is 10G.
Frequency-selecting method of the present invention adopts and first screens suitable frequency range, from the frequency range filtering out, filter out again the method for suitable reception frequency office of acceptance discharge signal, can get rid of the frequency range that some are not suitable for office of acceptance's discharge signal, thereby can obtain Partial discharge signal the most clearly, and then make the positioning precision of Partial discharge signal high.
Brief description of the drawings
Fig. 1 is the process flow diagram of frequency-selecting method of the present invention.
Embodiment
For technical scheme, technical characterictic that the present invention is realized, reach object and effect is easy to understand, below in conjunction with embodiment, further set forth the present invention.The invention is not restricted to described embodiment.
The location of more existing discharge signals is by the mode of multi-channel rf wireless receiving, discharge signal to be received, resolves to locate, and marks discharge position according to calculation result in video image.We know, discharge signal is a high current, narrow pulse signal, and the frequency content being rich in is quite a lot of, and frequency range covers wider, is the burst pulse that a pulsewidth reached for tens nanoseconds in time domain, is a wide spectrum signal that is similar to white noise on frequency domain.But mobile phone signal frequency 900MHz and 1800MHz that we often use, TV signal and broadcast singal, short-wave radio sets etc. extensively exist in external field environment, therefore it is unavailable with discharge signal frequency overlap part, fortunately these signals have a common feature, be exactly that signal keeps continuing, therefore we can distinguish the temporal properties of undesired signal and discharge signal by method of the present invention.
With reference to Fig. 1, the present invention is the frequency-selecting method of apparatus insulated internal discharge visual detection system receive frequency in a kind of air, comprises the following steps:
(1) full frequency band gathers time-domain signal;
(2) described time-domain signal frequency-division section is done to Fourier analysis, obtain frequency-region signal;
(3) 30-1800MHz frequency range is divided into 30-100MHz, 100-300 MHz, 300-900 MHz and tetra-frequency ranges of 900-1800MHz and judges the amplitude size of each band interference signal, obtain the frequency range of interference signal amplitude minimum, if two band interference signal amplitudes are identical, select frequency range that frequency range the is high frequency range as interference signal amplitude minimum, because the signal amplitude that high band receives is high, signal energy value is large;
(4) in the frequency range of interference signal amplitude minimum, select frequency that signal to noise ratio (S/N ratio) the is the highest receive frequency as Partial discharge signal.
30-1800MHz frequency range is divided into 30-100MHz, 100-300 MHz, 300-900 MHz and tetra-frequency ranges of 900-1800MHz and judges the amplitude size of each band interference signal, obtain in the frequency range of interference signal amplitude minimum the interference signal amplitude using the interference signal amplitude value of amplitude maximum in each frequency range in four frequency ranges as this frequency range.
In the time that described 30-1800MHz frequency range is divided into the poor 6dB of being less than or equal to of interference signal amplitude of two frequency ranges in 30-100MHz, 100-300 MHz, 300-900 MHz and tetra-frequency ranges of 900-1800MHz, determine that two band interference signal amplitudes are identical.While being less than 6dB, undesired signal difference is less, thus while choosing 6dB as separation.
Due to the frequency range of selecting 30-1800MHz as alternative use in this method, in order to ensure can to know the spectrum curve of finding out this frequency range when the high band, therefore in described full frequency band collection time-domain signal, preferably adopting the such high sampling rate of 10-20G to carry out signals collecting can meet the demands, but consider cost, preferably adopt 10G sampling rate.
Said method adopts and first screens suitable frequency range, from the frequency range filtering out, filter out again the method for suitable reception frequency office of acceptance discharge signal, can get rid of the frequency range that some are not suitable for office of acceptance's discharge signal, thereby can obtain Partial discharge signal the most clearly, and then make the positioning precision of Partial discharge signal high.
More than show and described ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and instructions, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (5)
1. a frequency-selecting method for apparatus insulated internal discharge detection system receive frequency in air, comprises the following steps:
A. full frequency band gathers time-domain signal;
B. described time-domain signal frequency-division section is done to Fourier analysis, obtain frequency-region signal;
C. 30-1800MHz frequency range is divided into the amplitude size that 30-100MHz, 100-300 MHz, 300-900 MHz and tetra-frequency ranges of 900-1800MHz judge each band interference signal, obtain the frequency range of interference signal amplitude minimum, if two band interference signal amplitudes are identical, select frequency range that frequency range the is high frequency range as interference signal amplitude minimum;
D. in the frequency range of interference signal amplitude minimum, select frequency that signal to noise ratio (S/N ratio) the is the highest receive frequency as discharge signal.
2. the frequency-selecting method of apparatus insulated internal discharge detection system receive frequency in a kind of air according to claim 1, it is characterized in that, in step c, the interference signal amplitude using the interference signal amplitude value of amplitude maximum in each frequency range in four frequency ranges as this frequency range.
3. the frequency-selecting method of apparatus insulated internal discharge detection system receive frequency in a kind of air according to claim 2, it is characterized in that, in step c, when the interference signal amplitude of two frequency ranges in four frequency ranges is poor while being less than or equal to 6dB, determine that two band interference signal amplitudes are identical.
4. the frequency-selecting method of apparatus insulated internal discharge detection system receive frequency in a kind of air according to claim 1, is characterized in that, in step a, sampling rate is 10-20G.
5. the frequency-selecting method of apparatus insulated internal discharge detection system receive frequency in a kind of air according to claim 4, is characterized in that, in step a, sampling rate is 10G.
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| CN201410319085.XA CN104111375A (en) | 2014-07-07 | 2014-07-07 | Frequency selection method of receiving frequency of in-air device insulating internal discharge detection system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111812463A (en) * | 2020-06-10 | 2020-10-23 | 深圳供电局有限公司 | High-frequency partial discharge detection system and method |
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| JPH09318698A (en) * | 1996-05-31 | 1997-12-12 | Hokuriku Electric Power Co Inc:The | Partial discharge detecting method and partial discharge detecting device |
| KR20070096498A (en) * | 2006-03-24 | 2007-10-02 | (주)엠파워 | Partial discharge measurement system for power cable |
| CN103033797A (en) * | 2012-12-17 | 2013-04-10 | 西安电子工程研究所 | Metrewave radar self-adaption frequency selection method based on spatial filtering |
| CN103558517A (en) * | 2013-10-29 | 2014-02-05 | 云南电网公司楚雄供电局 | Method for positioning high-voltage apparatus electro-discharge source based on energy change |
| CN203465376U (en) * | 2011-07-11 | 2014-03-05 | 云南电力试验研究院(集团)有限公司 | Electric power-used adaptive frequency-selection impedance partial discharge detector |
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2014
- 2014-07-07 CN CN201410319085.XA patent/CN104111375A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09318698A (en) * | 1996-05-31 | 1997-12-12 | Hokuriku Electric Power Co Inc:The | Partial discharge detecting method and partial discharge detecting device |
| KR20070096498A (en) * | 2006-03-24 | 2007-10-02 | (주)엠파워 | Partial discharge measurement system for power cable |
| CN203465376U (en) * | 2011-07-11 | 2014-03-05 | 云南电力试验研究院(集团)有限公司 | Electric power-used adaptive frequency-selection impedance partial discharge detector |
| CN103033797A (en) * | 2012-12-17 | 2013-04-10 | 西安电子工程研究所 | Metrewave radar self-adaption frequency selection method based on spatial filtering |
| CN103558517A (en) * | 2013-10-29 | 2014-02-05 | 云南电网公司楚雄供电局 | Method for positioning high-voltage apparatus electro-discharge source based on energy change |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111812463A (en) * | 2020-06-10 | 2020-10-23 | 深圳供电局有限公司 | High-frequency partial discharge detection system and method |
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Application publication date: 20141022 |