CN105988067B - Disturbance restraining method and device in a kind of detection of partial-discharge ultrahigh-frequency - Google Patents
Disturbance restraining method and device in a kind of detection of partial-discharge ultrahigh-frequency Download PDFInfo
- Publication number
- CN105988067B CN105988067B CN201510093744.7A CN201510093744A CN105988067B CN 105988067 B CN105988067 B CN 105988067B CN 201510093744 A CN201510093744 A CN 201510093744A CN 105988067 B CN105988067 B CN 105988067B
- Authority
- CN
- China
- Prior art keywords
- frequency
- test
- partial
- signal
- peak value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses the disturbance restraining methods and device in a kind of detection of partial-discharge ultrahigh-frequency, to solve the high-frequency narrow-band interference problem in partial-discharge ultrahigh-frequency detection.Method in the present invention includes：In partial-discharge ultrahigh-frequency detection system measurement band limits, complete entirely to measure the assessment test of the signal energy distribution in band limits by the way of frequency method gradually stepping；Calculate the signal difference peak value of sequence of test data corresponding to each frequency point；It repeats the above steps m times, calculates the average value of the signal difference peak value of the m sequence of test data, take frequency point corresponding to the average value of maximum signal difference peak value as test frequency point optimal in current environment, wherein m is positive integer；System operating mode is switched to：Narrowband test operating mode centered on test frequency point optimal in the current environment.
Description
Technical field
The present invention relates to substation's partial-discharge ultrahigh-frequencies to detect jamproof technical field, is especially in the presence of narrowband interference
Substation's complex electromagnetic environment in Partial Discharge Detection in the disturbance restraining method applied, further relate to realize that this there are narrow
The device of disturbance restraining method in Partial Discharge Detection in substation's complex electromagnetic environment with interference.
Background technique
In recent years, superfrequency method (UHF) due to its anti-interference is good, high sensitivity, can position the advantages that, GIS,
It is widely used in the detection of the high-voltage electrical apparatus apparatus local discharge such as transformer.However, being carried out using UHF detection method
In the practice of local discharge of electrical equipment detection, especially run in live Partial Discharge Detection work in equipment, ambient enviroment
In a large amount of high-frequency interferencing signal, still can generate serious interference to detection and diagnosis effect.Continuous preiodic type interferes
One of live shelf depreciation test common interference source, including electric system carrier communication, high-frequency protecting signal, mobile communication is wireless
Electricity etc., such interference is usually high_frequency sine wave, has fixed resonance frequency (generally in 700MHz or more), with smart grid
The rapid development of construction and mobile communication technology, this kind of high-frequency narrow-band interference are more universal.
Instantly superfrequency partial discharge detecting system mainstream uses the measurement method of broadband demodulation, and detection pulsewidth is in 100 μ s-
Between 300 μ s, such as in this case, will become the DC level of a lifting after the interference detection of external high frequency narrowband, detecting
The page shows as vertical off setting signal, which will lead to the setting of detection system threshold value and lose value, discharge time, electric discharge width
The false statistic of the key messages such as value, discharge phase width, finally causes test data to fail.Cause letter for narrowband interference at present
The processing of number biasing problem, there are two types of modes：(1) artificially increase detection threshold value；(2) narrowband is added in signal conditioner entrance front end
Filter.Mode 1 faces Different field environment narrow-band interference signal intensity different problems, and threshold value is difficult to unification, and detects
Amplitude has been biased effect of signals and has been distorted；Mode 2, which adds narrow band filter, can weaken discharge signal self-energy, cause to detect
Sensitivity decrease, and the case where which can only cope with single narrow-band interferer, narrowband is used to multiple narrow-band interferers series winding
Filter then causes detection signal energy substantially to decay, and seriously affects detection sensitivity；Two kinds of processing modes are on-the-spot test
Helpless expedient method in work has no maturation at present aiming at the problem that interference of superfrequency Partial Discharge Detection medium-high frequency narrowband
, the disturbance restraining method that adaptive ability is strong.
Summary of the invention
The object of the present invention is to provide the disturbance restraining methods and device in a kind of detection of partial-discharge ultrahigh-frequency, use
To solve the high-frequency narrow-band interference problem in partial-discharge ultrahigh-frequency detection.
Disturbance restraining method in partial-discharge ultrahigh-frequency detection of the invention includes：Partial-discharge ultrahigh-frequency detection system
It measures in band limits, completes entirely to measure the signal energy distribution in band limits by the way of frequency method gradually stepping
Assessment test；Calculate the signal difference peak value of sequence of test data corresponding to each frequency point；It repeats the above steps m times, calculates m times
The average value of the signal difference peak value of the sequence of test data takes frequency point corresponding to the average value of maximum signal difference peak value to make
For test frequency point optimal in current environment, wherein m is positive integer；System operating mode is switched to：In the current environment
Narrowband test operating mode centered on optimal test frequency point.
Preferably, under different partial discharge detecting system measurement bin widths, the point frequency of the frequency point method gradually stepping
Step width is different.
Preferably, the assessment test refers to：In the test environment that unknown signal energy is distributed, by frequency method by
Step by step into mode, obtain partial discharge detecting system measurement band limits in environment signal energy spectrum distribution information.
Preferably, the calculation method of the signal difference peak value is：
Signal difference peak value=sequence of test data peak value-sequence of test data mode；
To achieve the goals above, according to another aspect of the present invention, it provides in a kind of detection of partial-discharge ultrahigh-frequency
Interference rejection unit；
Interference rejection unit in partial-discharge ultrahigh-frequency detection of the invention includes：Signal acquisition module, for part
Electric discharge superfrequency detection system entirely measures the signal condition assessment test in band limits；Computing module, it is each for calculating
Optimal test frequency in the signal difference peak value or signal difference peak average value or current environment of sequence of test data corresponding to frequency point
Point；Signal conditioning module, for the narrowband operation mode and wideband operation in partial-discharge ultrahigh-frequency detection system test process
The control of center frequency point under the switching and narrowband operation mode of mode；
Preferably, the signal conditioning module includes switching module, is tested for partial-discharge ultrahigh-frequency detection system
The switching of narrowband operation mode and broadband work pattern in journey.
Preferably, the signal conditioning module includes frequency mixing module, the control for center frequency point under narrowband operation mode.
It applies the technical scheme of the present invention, realizes that the narrowband of adaptive frequency band selection is surveyed by signal difference peak value Optimal condition
Examination can effectively avoid the high-frequency narrow-band interference at scene, obtain clean discharge signal, guarantee the validity of detection data.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes a part of present application, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings,
Fig. 1 be according to embodiments of the present invention in partial-discharge ultrahigh-frequency detection in disturbance restraining method flow chart；
Fig. 2 is signal difference peak computational schematic diagram in the embodiment of the present invention；Wherein, H is signal difference peak value, and Vmax is data
The peak value of sequence V, Vm are the mode of data sequence V
Fig. 3 A be partial discharge detecting system measurement bin width be 300M-1.5G, frequency point method gradually stepping point frequency walk
It is the time domain waveform before the signal de-noising under 10M and the time domain waveform after noise reduction into width；
Fig. 3 B is that partial discharge detecting system measurement bin width is 300M-2G, the point frequency stepping of frequency point method gradually stepping
Width is the time domain waveform before the signal de-noising under 20M and the time domain waveform after noise reduction.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the application can be with
It is combined with each other.Below with reference to the accompanying drawings and in conjunction with the embodiments the present invention will be described in detail.
Fig. 1 be according to embodiments of the present invention in partial-discharge ultrahigh-frequency detection in disturbance restraining method flow chart, such as
Shown in Fig. 1, this method comprises the following steps S11-S14：
Step S11：In partial-discharge ultrahigh-frequency detection system measurement band limits, using the side of frequency method gradually stepping
Formula completes the assessment test of the signal energy distribution in entire measurement band limits.
Step S12：Calculate the signal difference peak value of sequence of test data corresponding to each frequency point.
Step S13：It repeats the above steps m times, calculates the average value of the signal difference peak value of the m sequence of test data,
Take frequency point corresponding to the average value of maximum signal difference peak value as test frequency point optimal in current environment, wherein m is positive whole
Number.
Step S14：System operating mode is switched to：Narrowband centered on test frequency point optimal in the current environment
Test job mode.
It is illustrated below for above-mentioned steps.
The present invention proposes that the core ideas of method is：Change traditional superfrequency partial discharge detecting system broadband work pattern
For narrowband operation, and the selection of narrow frequency bands is optimal for criterion with signal difference peak value proposed by the present invention, which can guarantee narrow
Band frequency band is chosen for discharge pulse signal energetic optimum distribution frequency range and obtains clean to avoid high-frequency narrow-band signal frequency range
Discharge information.
The signal difference peak value of pulse signal is the size that pulse is higher than low noise.H representation signal difference peak value, high frequency narrow can be used
It is horizontal line after band interference signal detection, although amplitude is higher, signal difference peak value H is smaller, is close to 0, such signal difference peak
Being worth maximum criterion can guarantee that the frequency range filtered out is the highest frequency range of pulse signal detection amplitude, and successfully avoid narrowband interference
Frequency range.That is, signal difference peak computational method is：
H=Vmax-Vm (1)
Wherein Vmax is the peak value of data sequence V, and Vm is the mode of data sequence V.Signal difference peak value H is calculated such as Fig. 2 institute
Show.
The specific implementation steps are as follows for the present embodiment the method：
1) it in partial-discharge ultrahigh-frequency detection system measurement frequency range, is completed by the way of frequency method gradually stepping entire
Measure band limits signal condition assessment test (in the test environment that unknown signal energy is distributed, by frequency method by
Step by step into mode, obtain partial discharge detecting system measurement band limits in environment signal energy spectrum distribution information)；Point
Frequency step width is different according to different partial discharge detecting system measurement bin widths, for example, partial-discharge ultrahigh-frequency detects
Systematic survey frequency range is 300M-1.5G, and the stepping of 10M can be used, if partial-discharge ultrahigh-frequency detection system measurement frequency range is
The step width of 20M can be used in 300M-2G.
2) partial-discharge ultrahigh-frequency detection system measures frequency range ÷ step width=frequency point number；If representing frequency point number with n, 0
≤ i≤n, fi represent i-th of frequency point, then in order to capture the pulse signal of more complete shelf depreciation, we be can be set often
Length of testing speech under one frequency point fi is set as 20ms.
If 3) represent sequence of test data with V, it is directed to each frequency point fi test data, test data can be calculated
Signal difference peak value Hi of the sequence V on corresponding frequency point fi.
4) after the point frequency stepping testing process of entire sequence of test data V, frequency point sequence and signal difference peak value are obtained
Sequence nucleotide sequence is to (fi, Hi).
5) in order to guarantee preferable frequency range screening effect, it can continuously repeat and execute 1-4 step, for example execute m times, obtain one
Series obtains frequency point sequence and signal difference peak value sequence nucleotide sequence to (fim, Him), and can be calculated by being averaging, and obtains
Frequency point serial mean and signal difference peak averaging value sequence pairFind out signal difference peak average valueMaximum
ValueAnd its corresponding frequency point is denoted asOptimal test frequency point as in current environment.
6) switching system operating mode be withCentered on narrowband test operating mode.
Illustrate the particular content of the present embodiment technical solution below by an actual detection system.
Hardware mainly includes three signal conditioner, analog acquisition card and host computer parts.The narrowband of fixed center frequency
Detection can be completed by signal conditioner, which should carry frequency mixer, and the centre frequency to guarantee narrow band detection is variable；
Part of data acquisition is realized by analog acquisition card；Optimal survey in algorithm flow control, signal difference peak computational and current environment
The selection for trying frequency point is realized by host computer (built-in algorithm software).AF panel in the present embodiment is real on this hardware foundation
It applies.
In the present embodiment, under different partial discharge detecting system measurement bin widths, the frequency point method gradually stepping
Point frequency step width is different.
In Fig. 3 A, superfrequency detection system working band range is set as 300M-1.5G, point frequency stepping is set as 10M, each
The frequency point lower testing time is set as 20ms, and point-frequency test is repeated 20 times in full frequency band, after the time domain waveform and noise reduction before signal de-noising
Time domain waveform.Detected amplitude has the direct current biasing of 0.5V or so before noise reduction, disappears after noise reduction；There is communication carrier-in-interference before noise reduction
The square-wave waveform of signal demodulator disappears after noise reduction.The 300M-1.5G wide band detection used before noise reduction, what is chosen after noise reduction is
550M narrow band detection, so signal amplitude slightly reduces.It is 20ms (frequency cycle) that the two, which samples duration,.
Provide the interference rejection unit packet in a kind of detection of partial-discharge ultrahigh-frequency again based on the above method, in the present embodiment
It includes：Signal acquisition module entirely measures the signal condition in band limits for partial-discharge ultrahigh-frequency detection system and knows the real situation survey
Examination, signal acquisition module can be realized by analog acquisition card in the implementation, computing module, for calculating survey corresponding to each frequency point
Optimal test frequency point in the signal difference peak value, signal difference peak average value, current environment of data sequence is tried, in the implementation, is calculated
Module can be realized by computer programming；Signal conditioning module, in partial-discharge ultrahigh-frequency detection system test process
The control of center frequency point, believes in the implementation under the switching and narrowband operation mode of narrowband operation mode and broadband work pattern
Number conditioning module can be completed by the signal conditioner for carrying frequency mixer.
Signal conditioning module includes switching module, for the narrowband work in partial-discharge ultrahigh-frequency detection system test process
The switching of operation mode and broadband work pattern, signal conditioning module further include frequency mixing module, for center under narrowband operation mode
The control of frequency point.
It can variants 1
In this example, all method and steps or apparatus structure all with it is consistent in embodiment 1, except that changing some settings
Parameter, for example, set superfrequency detection system working band range as 300M-2G, point frequency stepping is set as 20M, under each frequency point
Testing time is set as 20ms, and point-frequency test is repeated 20 times in full frequency band, the time domain after time domain waveform and noise reduction before signal de-noising
Waveform is as shown in Figure 3B.
Detected amplitude has the direct current biasing of 0.5V or so before noise reduction, disappears after noise reduction；There is communication carrier-in-interference letter before noise reduction
The square-wave waveform of number detection disappears after noise reduction.The 300M-2G wide band detection used before noise reduction, that choose after noise reduction is 560M narrow
Band detection, so signal amplitude slightly reduces.It is 20ms (frequency cycle) that the two, which samples duration,.
The narrow-band interference rejection method of adaptive frequency band selection proposed by the present invention, core ideas are to change traditional superfrequency
Partial discharge detecting system broadband work pattern is narrowband operation, and the selection of narrow frequency bands is with signal difference peak proposed by the present invention
Being worth optimal is criterion, which can guarantee that narrow frequency bands are chosen for discharge pulse signal energetic optimum distribution frequency range, to avoid
High-frequency narrow-band signal frequency range, obtains clean discharge information.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of protection of the claims
Subject to.
Claims (5)
1. the disturbance restraining method in a kind of partial-discharge ultrahigh-frequency detection, which is characterized in that detected in partial-discharge ultrahigh-frequency
In systematic survey band limits, complete entirely to measure the signal energy minute in band limits by the way of frequency method gradually stepping
The assessment test of cloth；
Calculate the signal difference peak value of sequence of test data corresponding to each frequency point；
It repeats the above steps m times, calculates the average value of the signal difference peak value of the m sequence of test data, take maximum signal
Frequency point corresponding to the average value of poor peak value is as test frequency point optimal in current environment, wherein m is positive integer；
System operating mode is switched to：Narrowband test Working mould centered on test frequency point optimal in the current environment
Formula.
2. the method according to claim 1, wherein different partial discharge detecting systems measures bin width
Under, the point frequency step width of the frequency point method gradually stepping is different.
3. the method according to claim 1, wherein the assessment test refers to：In unknown signal energy point
In the test environment of cloth, by way of frequency method gradually stepping, obtains partial discharge detecting system and measure band limits inner ring
The spectrum distribution information of border signal energy.
4. the method according to claim 1, wherein the calculation method of the signal difference peak value is：
Signal difference peak value=sequence of test data peak value-sequence of test data mode.
5. the interference rejection unit in a kind of partial-discharge ultrahigh-frequency detection, which is characterized in that including：
Signal acquisition module entirely measures the signal condition in band limits for partial-discharge ultrahigh-frequency detection system and knows the real situation survey
Examination；
Computing module, for calculating the signal difference peak value and signal difference peak averaging of sequence of test data corresponding to each frequency point
Optimal test frequency point in value and current environment；
Signal conditioning module, for the narrowband operation mode and wideband operation in partial-discharge ultrahigh-frequency detection system test process
The control of center frequency point under the switching and narrowband operation mode of mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510093744.7A CN105988067B (en) | 2015-03-03 | 2015-03-03 | Disturbance restraining method and device in a kind of detection of partial-discharge ultrahigh-frequency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510093744.7A CN105988067B (en) | 2015-03-03 | 2015-03-03 | Disturbance restraining method and device in a kind of detection of partial-discharge ultrahigh-frequency |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105988067A CN105988067A (en) | 2016-10-05 |
| CN105988067B true CN105988067B (en) | 2018-11-20 |
Family
ID=57039002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510093744.7A Active CN105988067B (en) | 2015-03-03 | 2015-03-03 | Disturbance restraining method and device in a kind of detection of partial-discharge ultrahigh-frequency |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105988067B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109788112B (en) * | 2019-02-25 | 2023-10-20 | 深圳市摩尔环宇通信技术有限公司 | 5G terminal anti-interference degree test method, system and equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101046497A (en) * | 2006-03-29 | 2007-10-03 | 宝山钢铁股份有限公司 | Method of detecting local discharge signal in electric power equipment |
| CN101788582A (en) * | 2010-02-03 | 2010-07-28 | 华北电力大学 | Interference suppression method and device for local discharge detection of equipment |
| CN103675617A (en) * | 2013-11-20 | 2014-03-26 | 西安交通大学 | Anti-interference method for high-frequency partial discharge signal detection |
| CN103901330A (en) * | 2014-04-15 | 2014-07-02 | 上海君世电气科技有限公司 | Partial discharge on-line monitoring method for XLPE cable |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007059289B4 (en) * | 2007-12-08 | 2011-07-28 | Maschinenfabrik Reinhausen GmbH, 93059 | Device for testing transformers |
-
2015
- 2015-03-03 CN CN201510093744.7A patent/CN105988067B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101046497A (en) * | 2006-03-29 | 2007-10-03 | 宝山钢铁股份有限公司 | Method of detecting local discharge signal in electric power equipment |
| CN101788582A (en) * | 2010-02-03 | 2010-07-28 | 华北电力大学 | Interference suppression method and device for local discharge detection of equipment |
| CN103675617A (en) * | 2013-11-20 | 2014-03-26 | 西安交通大学 | Anti-interference method for high-frequency partial discharge signal detection |
| CN103901330A (en) * | 2014-04-15 | 2014-07-02 | 上海君世电气科技有限公司 | Partial discharge on-line monitoring method for XLPE cable |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105988067A (en) | 2016-10-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20150185262A1 (en) | Electrical load identification during an on event using a support vector machine classifier | |
| CN102624468B (en) | Automatic broadband detection method based on dual fast Fourier transformation (FFT) | |
| CN104316846B (en) | A kind of power equipment Partial Discharge Pattern Recognition Method, apparatus and system | |
| WO2012099943A1 (en) | Interference detection in a powerline communication network | |
| CN110266401A (en) | A kind of fast wireless electricity frequency spectrum detecting method and system | |
| CN105319537A (en) | Navigation radar co-frequency interference inhibition method based on spatial correlation | |
| CN110726875B (en) | New energy flexible direct-current grid-connected transient harmonic detection method and system | |
| CN106845334A (en) | A kind of innovative noise extracting method based on mathematical morphology | |
| CN105988067B (en) | Disturbance restraining method and device in a kind of detection of partial-discharge ultrahigh-frequency | |
| CN104596369B (en) | A kind of continuous wave Doppler Radio Fuze Anti sweep-frequency Békésy audiometer interference method based on SVM | |
| Chen et al. | Unlocking signal processing with image detection: A frequency hopping detection scheme for complex EMI environments using STFT and CenterNet | |
| CN114113943A (en) | Transformer partial discharge detection system, method and equipment based on current and ultrasonic signals | |
| Liu et al. | A novel signal separation algorithm for wideband spectrum sensing in cognitive networks | |
| CN103051401B (en) | Cognitive radio frequency spectrum sensing method based on wavelets | |
| CN104865508A (en) | Partial discharge recognition method based on data grouping quantification | |
| CN105891610B (en) | A kind of stage division of transformer station's shelf depreciation live detection electromagnetic interference signal | |
| CN117289087A (en) | Series fault arc detection method based on CZT conversion | |
| Gan et al. | Statistical model of foreign object detection for wireless EV charger | |
| JP2003307539A (en) | Apparatus for diagnosing partial discharge of gas insulator | |
| CN114111456A (en) | Unmanned aerial vehicle defense system for power transformer substation and important facilities | |
| CN112611929A (en) | Anomaly detection method applied to three-phase alternating current and related device | |
| Huang et al. | A precise location method of power quality disturbances based on morphological edge detection | |
| Chantaraskul et al. | Experimental study of multi-resolution spectrum opportunity detection using wavelet analysis | |
| CN105187143A (en) | Method and device for quickly sensing spectrum based on binomial distribution | |
| CN106226744B (en) | A kind of interference characteristic extracting method based on projective transformation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: Room D1341, Main Building, North China Electric Power University, No. 2 Beinong Road, Huilongguan Town, Changping District, Beijing 102200 Patentee after: Beijing Huadian Zhicheng Electrical Equipment Co., Ltd. Address before: No. 237 Wenfeng Village, West Town, Longxi County, Fujian Province Patentee before: Beijing Huadian Zhicheng Electrical Equipment Co., Ltd. |