CN104483602A - Local discharge signal identification method and device - Google Patents
Local discharge signal identification method and device Download PDFInfo
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- CN104483602A CN104483602A CN201410710683.XA CN201410710683A CN104483602A CN 104483602 A CN104483602 A CN 104483602A CN 201410710683 A CN201410710683 A CN 201410710683A CN 104483602 A CN104483602 A CN 104483602A
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Abstract
The embodiment of the invention provides a local discharge signal identification method and device. The method comprises the following steps of obtaining and displaying an output signal of high-voltage equipment, wherein the output signal comprises a pulse signal and a sinusoidal signal, and the pulse signal comprises a target signal; carrying out spectral analysis on the pulse signal to obtain a frequency domain signal; carrying out band-pass filtering on the frequency domain signal to obtain a band-pass frequency domain signal; carrying out time domain analysis on the band-pass frequency domain signal to obtain a time domain signal, and obtaining the target signal in the time domain signal; according to the characteristics of a standard discharging signal, judging whether the target signal is a local discharging signal. According to the embodiment of the invention, the target signal and an interference signal in the pulse signal are subjected to primary separation according to the correlation of the phases of the pulse signal and the sinusoidal signal in the output signal of the high-voltage equipment, the characteristics of the target signal are compared with the characteristics of the standard discharging signal to determine whether the target signal is the local discharging signal, a phenomenon that the interference signal is wrongly taken as the local discharging signal is avoided, and detection accuracy is improved.
Description
Technical field
The embodiment of the present invention relates to signal processing technology field, particularly relates to a kind of local discharge signal recognition methods and device.
Background technology
Along with the develop rapidly of electric power networks and electricity consumption cause, to the safe operation of electric power networks and electricity consumption also more and more pay attention to by electric system.Specific to high-tension apparatus, due to the hidden danger that the manufacturing defect of himself, the aging of insulating material or installation initial stage are left over, local discharge signal can be produced in operational process, during one or several very little region in high-tension apparatus of this local discharge signal, discharge energy is very little, and in a short time can not the insulativity of impact to voltage equipment, but long-term shelf depreciation will make the insulativity degradation of high-tension apparatus or insulativity disappear, and causes major accident to occur.In order to avoid the generation of accident, need to detect local discharge signal.
It is sinusoidal signal that high-tension apparatus outputs signal normally, owing to being disturbed the impact of signal and local discharge signal, the output signal of high-tension apparatus will comprise sinusoidal signal, undesired signal and local discharge signal simultaneously, wherein local discharge signal belongs to pulse signal, and prior art is detected in the output signal of high-tension apparatus by local discharge signal recognition device and whether comprises pulse signal and determine whether local discharge signal.
Because undesired signal also belongs to pulse signal, detect in the output signal of high-tension apparatus and whether comprise pulse signal to determine whether the method for local discharge signal, be easy to think undesired signal by mistake local discharge signal, cause the degree of accuracy that detects local discharge signal lower.
Summary of the invention
The embodiment of the present invention provides a kind of local discharge signal recognition methods and device, to improve the degree of accuracy detected local discharge signal.
An aspect of the embodiment of the present invention is to provide a kind of local discharge signal recognition methods, comprising:
Obtain and show the output signal of high-tension apparatus, described output signal comprises pulse signal and sinusoidal signal, and described pulse signal comprises the echo signal relevant to the phase place of described sinusoidal signal;
Spectrum analysis is carried out to described pulse signal and obtains frequency-region signal;
With predetermined center frequency and bandwidth, bandpass filtering is carried out to described frequency-region signal and obtains the logical frequency-region signal of band;
Frequency-region signal is led to described band and carries out time-domain analysis acquisition time-domain signal, and obtain the described echo signal in described time-domain signal;
The feature of establishing criteria discharge signal judges whether described echo signal is local discharge signal.
Another aspect of the embodiment of the present invention is to provide a kind of local discharge signal recognition device, comprising:
Obtain display module, for obtaining and showing the output signal of high-tension apparatus, described output signal comprises pulse signal and sinusoidal signal, and described pulse signal comprises the echo signal relevant to the phase place of described sinusoidal signal;
Spectrum analysis module, obtains frequency-region signal for carrying out spectrum analysis to described pulse signal;
Bandpass filtering modules block, obtains the logical frequency-region signal of band for carrying out bandpass filtering to described frequency-region signal with predetermined center frequency and bandwidth;
Time-domain analysis module, carries out time-domain analysis acquisition time-domain signal for leading to frequency-region signal to described band, and obtains the described echo signal in described time-domain signal;
Judge module, the feature for establishing criteria discharge signal judges whether described echo signal is local discharge signal.
The local discharge signal recognition methods that the embodiment of the present invention provides and device, the correlativity of the pulse signal in outputing signal according to high-tension apparatus and the phase place of sinusoidal signal, echo signal in pulse signal and undesired signal are carried out initial gross separation, and contrasted by the feature of echo signal and standard discharge signal, determine whether this echo signal is local discharge signal further, pulse signal whether is comprised to determine whether the method for local discharge signal compared in the output signal only detecting high-tension apparatus, avoid and think undesired signal by mistake local discharge signal, improve the degree of accuracy that local discharge signal is detected.
Accompanying drawing explanation
The local discharge signal recognition methods process flow diagram that Fig. 1 provides for the embodiment of the present invention;
The output signal display figure of the high-tension apparatus that Fig. 2 provides for the embodiment of the present invention;
The frequency domain signal diagrams that Fig. 3 provides for the embodiment of the present invention;
The time-domain signal figure that Fig. 4 provides for the embodiment of the present invention;
The oscillogram of the echo signal that Fig. 5 provides for the embodiment of the present invention;
The structural drawing of the local discharge signal recognition device that Fig. 6 provides for the embodiment of the present invention;
The structural drawing of the local discharge signal recognition device that Fig. 7 provides for another embodiment of the present invention.
Embodiment
The local discharge signal recognition methods process flow diagram that Fig. 1 provides for the embodiment of the present invention; The output signal display figure of the high-tension apparatus that Fig. 2 provides for the embodiment of the present invention; The frequency domain signal diagrams that Fig. 3 provides for the embodiment of the present invention; The time-domain signal figure that Fig. 4 provides for the embodiment of the present invention; The oscillogram of the echo signal that Fig. 5 provides for the embodiment of the present invention.The local discharge signal recognition methods that the embodiment of the present invention provides is performed by local discharge signal recognition device, and the concrete steps of the method are as follows:
Step S101, acquisition show the output signal of high-tension apparatus, described output signal comprises pulse signal and sinusoidal signal, and described pulse signal comprises the echo signal relevant to the phase place of described sinusoidal signal;
Described acquisition the output signal showing high-tension apparatus comprise: the amplitude and the phase place that obtain pulse signal described in described output signal, accumulation shows the two-dimensional coordinate point be made up of described amplitude and described phase place continuously.
The output signal of operating high-tension apparatus collects in local discharge signal recognition device by high frequency sensors and hardware acquisition process circuit by the embodiment of the present invention, this local discharge signal recognition device is also connected with computing machine, by the output signal of described this high-tension apparatus of Computer display, as shown in Figure 2, this output signal comprise sinusoidal signal and with get ready form display pulse signal, now is gone out for obtaining pulse signal with the detailed process getting form display pulse signal ready, and the amplitude of the pulse signal in this moment and phase place, with amplitude and phase place for coordinate points, this coordinate points is shown in two-dimensional coordinate figure, because the frequency of pulse signal is much larger than the frequency of sinusoidal signal, so the coordinate points that numerous pulse signal is corresponding will be there is in the one-period of sinusoidal signal, and also not there will be the point of same coordinate in the same time, namely in the one-period of sinusoidal signal, same coordinate points there will be repeatedly, in the process got ready, same coordinate points will be beaten repeatedly, the number of times that different coordinate points is got ready may be different, the different colors of number of times of getting ready different in the one-period of sinusoidal signal represents, and it is more to get number of times ready, this coordinate points color is darker, what obtain different gray shade scales as shown in Figure 2 thus gets figure ready, gray-scale value is darker, represent that the number of times that this coordinate points is got ready is more.Get intensive place ready and also can form continuous print region.Because local discharge signal is relevant with the phase place of sinusoidal signal, and the phase place of undesired signal and sinusoidal signal has nothing to do, so local discharge signal and undesired signal can be carried out initial gross separation according to the correlativity of the phase place of pulse signal in Fig. 2 and sinusoidal signal, the signal relevant to the phase place of described sinusoidal signal that pulse signal comprises by the embodiment of the present invention is as echo signal to be determined.
Step S102, described pulse signal carried out to spectrum analysis and obtain frequency-region signal;
Spectrum analysis is carried out to the pulse signal in step S101, is specially and adopts Fourier transform the pulse signal of time domain to be converted to frequency-region signal as shown in Figure 3.
Step S103, with predetermined center frequency and bandwidth, bandpass filtering is carried out to described frequency-region signal obtain the logical frequency-region signal of band;
Frequency-region signal as shown in Figure 3 occupies wider frequency range, the embodiment of the present invention is carried out bandpass filtering with predetermined center frequency 4.99MHz and bandwidth 2.5MHz to frequency-region signal and is obtained the logical frequency-region signal of band, namely intercepts centered by predetermined center frequency 4.99MHz and retains the frequency-region signal within the scope of bandwidth 2.5MHz.
Step S104, described band led to frequency-region signal and carry out time-domain analysis and obtain time-domain signal, and obtain the described echo signal in described time-domain signal;
Predetermined center frequency 4.99MHz after intercepting step S103, frequency-region signal within the scope of bandwidth 2.5MHz carry out time-domain analysis and are specially Fourier inversion and obtain time-domain signal as shown in Figure 4, and obtain the echo signal that the step S101 in this time-domain signal mentions.
The feature of step S105, establishing criteria discharge signal judges whether described echo signal is local discharge signal.
The echo signal got from the time-domain signal of step S104 as shown in Figure 5, and this echo signal have passed through amplification display, the amplitude of this echo signal, main lobe width, secondary lobe width can be known from Fig. 5, the feature of above-mentioned feature and standard discharge signal is contrasted, the similarity of contrast reaches certain threshold value, then illustrate that this echo signal is exactly local discharge signal, be i.e. in the output signal of high-tension apparatus, there is local discharge signal.
The correlativity of the pulse signal during the embodiment of the present invention outputs signal according to high-tension apparatus and the phase place of sinusoidal signal, echo signal in pulse signal and undesired signal are carried out initial gross separation, and contrasted by the feature of echo signal and standard discharge signal, determine whether this echo signal is local discharge signal further, pulse signal whether is comprised to determine whether the method for local discharge signal compared in the output signal only detecting high-tension apparatus, avoid and think undesired signal by mistake local discharge signal, improve the degree of accuracy that local discharge signal is detected.
On the basis of above-described embodiment, described pulse signal also comprises the first undesired signal and the second undesired signal, and described first undesired signal and described echo signal occur simultaneously, occurs when described second undesired signal is different from described echo signal; Describedly spectrum analysis is carried out to described pulse signal obtain before frequency-region signal, also comprise: remove described second undesired signal in described pulse signal.
Because undesired signal belongs to pulse signal, and undesired signal is present in the output signal of high-tension apparatus always, and echo signal is not exist always, so the present invention using the undesired signal that occurs with this echo signal simultaneously as the first undesired signal, using the undesired signal that occurs time different from this echo signal as the second undesired signal, in described second undesired signal of carrying out described pulse signal removing before spectrum analysis obtains frequency-region signal in described pulse signal, because the second undesired signal occupies special frequency channel, so the signal only need removing this special frequency channel in the output signal of high-tension apparatus can remove the second undesired signal.
Describedly with predetermined center frequency and bandwidth, bandpass filtering is carried out to described frequency-region signal obtain the logical frequency-region signal of band, for removing described first undesired signal in described pulse signal.
Because the first undesired signal and echo signal occur in the time domain simultaneously, to the first undesired signal and echo signal carry out spectrum analysis be transformed into frequency-region signal respectively time, different with the frequency range that echo signal occupies in a frequency domain according to the first undesired signal, just the frequency range that the first undesired signal is concentrated can be filtered out, specifically with predetermined center frequency and bandwidth, bandpass filtering is carried out to described frequency-region signal and obtain the logical frequency-region signal of band, namely the frequency range that the first undesired signal is concentrated is outside bandwidth, just can a large amount of the first undesired signal of filtering by bandpass filtering.
On the basis of the embodiment of the present invention, described spectrum analysis is Fourier transform, and described time-domain analysis is Fourier inversion.
The embodiment of the present invention is by removing the second undesired signal occurred time different from echo signal in the time domain, in a frequency domain the frequency range that the first undesired signal simultaneously occurred with echo signal is concentrated is filtered out, decrease undesired signal to the impact detecting local discharge signal, further increase the degree of accuracy that local discharge signal is detected.
The structural drawing of the local discharge signal recognition device that Fig. 6 provides for the embodiment of the present invention; The local discharge signal recognition device that the embodiment of the present invention provides can perform the treatment scheme that local discharge signal recognition methods embodiment provides, as shown in Figure 6, local discharge signal recognition device 60 comprises acquisition display module 61, spectrum analysis module 62, bandpass filtering modules block 63, time-domain analysis module 64 and judge module 65, wherein, obtain display module 61 for obtaining and showing the output signal of high-tension apparatus, described output signal comprises pulse signal and sinusoidal signal, and described pulse signal comprises the echo signal relevant to the phase place of described sinusoidal signal; Spectrum analysis module 62 obtains frequency-region signal for carrying out spectrum analysis to described pulse signal; Bandpass filtering modules block 63 obtains the logical frequency-region signal of band for carrying out bandpass filtering to described frequency-region signal with predetermined center frequency and bandwidth; Time-domain analysis module 64 carries out time-domain analysis acquisition time-domain signal for leading to frequency-region signal to described band, and obtains the described echo signal in described time-domain signal; For the feature of establishing criteria discharge signal, judge module 65 judges whether described echo signal is local discharge signal.
The correlativity of the pulse signal during the embodiment of the present invention outputs signal according to high-tension apparatus and the phase place of sinusoidal signal, echo signal in pulse signal and undesired signal are carried out initial gross separation, and contrasted by the feature of echo signal and standard discharge signal, determine whether this echo signal is local discharge signal further, pulse signal whether is comprised to determine whether the method for local discharge signal compared in the output signal only detecting high-tension apparatus, avoid and think undesired signal by mistake local discharge signal, improve the degree of accuracy that local discharge signal is detected.
The structural drawing of the local discharge signal recognition device that Fig. 7 provides for another embodiment of the present invention; On the embodiment basis that Fig. 6 is corresponding, described pulse signal also comprises the first undesired signal and the second undesired signal, and described first undesired signal and described echo signal occur simultaneously, occurs when described second undesired signal is different from described echo signal; Described local discharge signal recognition device 60 also comprises removes module 66, for removing described second undesired signal in described pulse signal.
Described bandpass filtering modules block 63 is specifically for removing described first undesired signal in described pulse signal.
Described acquisition display module 61 is specifically for obtaining amplitude and the phase place of pulse signal described in described output signal, and accumulation shows the two-dimensional coordinate point be made up of described amplitude and described phase place continuously.
Described spectrum analysis is Fourier transform, and described time-domain analysis is Fourier inversion.
The local discharge signal recognition device that the embodiment of the present invention provides can specifically for performing the embodiment of the method that above-mentioned Fig. 1 provides, and concrete function repeats no more herein.
The embodiment of the present invention is by removing the second undesired signal occurred time different from echo signal in the time domain, in a frequency domain the frequency range that the first undesired signal simultaneously occurred with echo signal is concentrated is filtered out, decrease undesired signal to the impact detecting local discharge signal, further increase the degree of accuracy that local discharge signal is detected.
In sum, the correlativity of the pulse signal during the embodiment of the present invention outputs signal according to high-tension apparatus and the phase place of sinusoidal signal, echo signal in pulse signal and undesired signal are carried out initial gross separation, and contrasted by the feature of echo signal and standard discharge signal, determine whether this echo signal is local discharge signal further, pulse signal whether is comprised to determine whether the method for local discharge signal compared in the output signal only detecting high-tension apparatus, avoid and think undesired signal by mistake local discharge signal, improve the degree of accuracy that local discharge signal is detected, by in the time domain the second undesired signal occurred time different from echo signal being removed, in a frequency domain the frequency range that the first undesired signal simultaneously occurred with echo signal is concentrated is filtered out, decrease undesired signal to the impact detecting local discharge signal, further increase the degree of accuracy that local discharge signal is detected.
In several embodiment provided by the present invention, should be understood that, disclosed apparatus and method, can realize by another way.Such as, device embodiment described above is only schematic, such as, the division of described unit, be only a kind of logic function to divide, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of device or unit or communication connection can be electrical, machinery or other form.
The described unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, also can be that the independent physics of unit exists, also can two or more unit in a unit integrated.Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form that hardware also can be adopted to add SFU software functional unit realizes.
The above-mentioned integrated unit realized with the form of SFU software functional unit, can be stored in a computer read/write memory medium.Above-mentioned SFU software functional unit is stored in a storage medium, comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) or processor (processor) perform the part steps of method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, portable hard drive, ROM (read-only memory) (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disc or CD etc. various can be program code stored medium.
Those skilled in the art can be well understood to, for convenience and simplicity of description, only be illustrated with the division of above-mentioned each functional module, in practical application, can distribute as required and by above-mentioned functions and be completed by different functional modules, inner structure by device is divided into different functional modules, to complete all or part of function described above.The specific works process of the device of foregoing description, with reference to the corresponding process in preceding method embodiment, can not repeat them here.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a local discharge signal recognition methods, is characterized in that, comprising:
Obtain and show the output signal of high-tension apparatus, described output signal comprises pulse signal and sinusoidal signal, and described pulse signal comprises the echo signal relevant to the phase place of described sinusoidal signal;
Spectrum analysis is carried out to described pulse signal and obtains frequency-region signal;
With predetermined center frequency and bandwidth, bandpass filtering is carried out to described frequency-region signal and obtains the logical frequency-region signal of band;
Frequency-region signal is led to described band and carries out time-domain analysis acquisition time-domain signal, and obtain the described echo signal in described time-domain signal;
The feature of establishing criteria discharge signal judges whether described echo signal is local discharge signal.
2. method according to claim 1, it is characterized in that, described pulse signal also comprises the first undesired signal and the second undesired signal, and described first undesired signal and described echo signal occur simultaneously, occurs when described second undesired signal is different from described echo signal;
Describedly spectrum analysis carried out to described pulse signal obtain before frequency-region signal, also comprise:
Remove described second undesired signal in described pulse signal.
3. method according to claim 2, is characterized in that, describedly carries out bandpass filtering to described frequency-region signal with predetermined center frequency and bandwidth and obtains the logical frequency-region signal of band, for removing described first undesired signal in described pulse signal.
4. method according to claim 3, is characterized in that, described acquisition the output signal showing high-tension apparatus comprise:
Obtain amplitude and the phase place of pulse signal described in described output signal, accumulation shows the two-dimensional coordinate point be made up of described amplitude and described phase place continuously.
5. the method according to any one of claim 1-4, is characterized in that, described spectrum analysis is Fourier transform, and described time-domain analysis is Fourier inversion.
6. a local discharge signal recognition device, is characterized in that, comprising:
Obtain display module, for obtaining and showing the output signal of high-tension apparatus, described output signal comprises pulse signal and sinusoidal signal, and described pulse signal comprises the echo signal relevant to the phase place of described sinusoidal signal;
Spectrum analysis module, obtains frequency-region signal for carrying out spectrum analysis to described pulse signal;
Bandpass filtering modules block, obtains the logical frequency-region signal of band for carrying out bandpass filtering to described frequency-region signal with predetermined center frequency and bandwidth;
Time-domain analysis module, carries out time-domain analysis acquisition time-domain signal for leading to frequency-region signal to described band, and obtains the described echo signal in described time-domain signal;
Judge module, the feature for establishing criteria discharge signal judges whether described echo signal is local discharge signal.
7. local discharge signal recognition device according to claim 6, it is characterized in that, described pulse signal also comprises the first undesired signal and the second undesired signal, and described first undesired signal and described echo signal occur simultaneously, occurs when described second undesired signal is different from described echo signal;
Described local discharge signal recognition device also comprises removal module, for removing described second undesired signal in described pulse signal.
8. local discharge signal recognition device according to claim 7, is characterized in that, described bandpass filtering modules block is specifically for removing described first undesired signal in described pulse signal.
9. local discharge signal recognition device according to claim 8, it is characterized in that, described acquisition display module is specifically for obtaining amplitude and the phase place of pulse signal described in described output signal, and accumulation shows the two-dimensional coordinate point be made up of described amplitude and described phase place continuously.
10. the local discharge signal recognition device according to any one of claim 6-9, is characterized in that, described spectrum analysis is Fourier transform, and described time-domain analysis is Fourier inversion.
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| CN112595934A (en) * | 2020-10-14 | 2021-04-02 | 浙江大有实业有限公司杭州科技发展分公司 | Method and device for measuring partial discharge signal intensity of high-voltage cable |
| CN112595934B (en) * | 2020-10-14 | 2024-05-17 | 浙江大有实业有限公司杭州科技发展分公司 | Method and device for measuring intensity of partial discharge signal of high-voltage cable |
| CN112698170A (en) * | 2021-01-18 | 2021-04-23 | 上海格鲁布科技有限公司 | Ultrahigh frequency partial discharge detection anti-interference method based on time domain waveform |
| CN113156284A (en) * | 2021-04-28 | 2021-07-23 | 西安西电开关电气有限公司 | Method and device for processing interference signals of GIS equipment switching action |
| CN113433424A (en) * | 2021-08-06 | 2021-09-24 | 广东电网有限责任公司 | Distribution network line tree falling detection method and system based on partial discharge |
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