CN107421636A - A kind of method for differentiating transmission line of electricity each span rainfall time started - Google Patents
A kind of method for differentiating transmission line of electricity each span rainfall time started Download PDFInfo
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- CN107421636A CN107421636A CN201710350673.3A CN201710350673A CN107421636A CN 107421636 A CN107421636 A CN 107421636A CN 201710350673 A CN201710350673 A CN 201710350673A CN 107421636 A CN107421636 A CN 107421636A
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- rainfall
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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Abstract
The present invention relates to a kind of method for differentiating transmission line of electricity each span rainfall time started, it is characterized in that, cause to shake according to wind and rain and the line spectrum of wind-induced vibration distribution sparse features identify whether to have rainfall with both rumble spectrum high frequency varying widths, methods described comprises the following steps：S1, Fourier transform is carried out to signal data and obtains frequency spectrum data；S2, vibrational spectra is extracted, find vibration sparse separation moment t (t1, t2...) of Spectral structure；S3, HFS oscillation intensity varying width is counted, finds varying width catastrophe point moment T (T1, T2...)；S4, if ABS (T t)<10 minutes, it is determined that (T, t) is rainy initial time between the time；Otherwise without rainfall, aforesaid operations is repeated, obtain the time that the rainfall of all fronts starts.The present invention can realize that each span is distributed and survey rain, and the research for causing to shake for transmission line of electricity wind and rain is laid a good foundation.
Description
Technical field
The invention belongs to transmission line of electricity rainfall signal monitoring technical field, and in particular to one kind differentiates each span of transmission line of electricity
The method of rainfall time started.
Background technology
In drag-line wind-induced vibration, rain wind induced vibration is most strong one kind, and this phenomenon of rain wind induced vibration is Japanese scholars
What Hikami had found first in 1986 on Meikonishi bridges, the wind speed range for producing rain wind induced vibration is about 6~8m/s, mesh
Before, wind and rain mechanism and vibration characteristics are not fully apparent from also, in order to study rain wind induced vibration mechanism, various countries expand substantial amounts of wind
Test in hole, it is believed that rain wind induced vibration, which is mainly that the upper waterline that is formed on power transmission line surface of rainwater is caused in the case where wind encourages, unstable to shake
Dynamic, rain wind induced vibration is very big to transmission line of electricity harm, and the present invention has established certain basis for research rain wind induced vibration, sentences for distribution
Determine rainfall to provide a method that.By literature search, not yet find that existing literature is related to differentiating each span drop of transmission line of electricity
The method of rain time started.
The content of the invention
In order to overcome above-mentioned the shortcomings of the prior art, it is an object of the invention to propose that a kind of differentiation transmission line of electricity is each
The method of span rainfall time started.
In order to achieve the above object, the technical solution adopted in the present invention is：One kind differentiates each span rainfall of transmission line of electricity
The method of time started, it is characterised in that cause to shake according to wind and rain and the line spectrum of wind-induced vibration is distributed sparse features and both shake
Frequency spectrum high frequency varying width is moved to identify whether to have rainfall, methods described comprises the following steps：
S1, Fourier transform is carried out to signal data and obtains frequency spectrum data；
S2, vibrational spectra is extracted, find vibration sparse separation moment t (t1, t2...) of Spectral structure；
S3, HFS oscillation intensity varying width is counted, finds varying width catastrophe point moment T (T1, T2...)；
S4, if ABS (T-t)<10 minutes, it is determined that (T, t) is rainy initial time between the time；Otherwise without rainfall,
Aforesaid operations are repeated, obtain the time that the rainfall of all fronts starts.
Further, step S2 is specifically included：The vibration Spectral structure of statistics transmission line of electricity for a period of time finds out wind and rain cause again
Shake and the sparse degree mutated site of the line spectrum distribution characteristics of wind-induced vibration, these moment are recorded according to the position for being distributed sparse abrupt change
t(t1,t2...)。
Further, step S3 is specifically included：It is wide to count the rumble spectrum HFS change of transmission line of electricity for a period of time
Spend mutated site, high-frequency range selection generally 1/3 times of effective frequency causes to shake and the rumble spectrum of wind-induced vibration according to wind and rain
High frequency varying width mutated site, preceding the 5% of HFS oscillation intensity maximum is chosen, calculating is averagely worth to a, calculates vibration
Intensity it is most weak rear 5% be averagely worth to b, width K=a-b, at the time of record K values become big suddenly.
Further, step S4 is specifically included：If vibrational spectra sparse mutated site moment and the change of rumble spectrum high frequency are wide
The time interval for spending the mutated site moment is less than ten minutes, then it is assumed that a certain moment between the two moment rains for the span
Starting point.
Compared with prior art, the beneficial effects of the invention are as follows：A kind of differentiation each span of transmission line of electricity proposed by the present invention
The method of rainfall time started, by influence caused by distribution of the rainfall to frequency spectrum and vibrational spectra, rain signal is identified,
It may determine that when each span begins to rain according to these features, realize that each span is distributed and survey rain, caused for transmission line of electricity wind and rain
The research shaken is laid a good foundation.
Brief description of the drawings
Fig. 1 is flow chart of the method for the present invention.
Fig. 2 is that wind and rain causes to shake and (the dotted line left side is that the right is that have rainfall without Sometimes When It Rains to the spectrogram of wind-induced vibration
Afterwards).
Fig. 3 is the spectrogram in the case of rain.
Fig. 4 is the spectrogram under no rain fall.
Embodiment
For the ease of those of ordinary skill in the art understand and implement the present invention, the present invention is made with reference to embodiment into
The detailed description of one step, it will be appreciated that implementation example described herein is merely to illustrate and explain the present invention, and is not used to limit
The fixed present invention.
By the observation of frequency spectrum under different weather to transmission line of electricity, it is found that it is bright with the difference of wind-induced vibration wind and rain cause is shaken
It is aobvious, a kind of method for differentiating transmission line of electricity each span rainfall time started is proposed according to these difference characteristics present invention.
Methods described is proposed based on following research conclusion.Research finds that wind and rain causes to shake to be with the difference of wind-induced vibration：One,
Vibrational spectra is less in the frequency spectrum that wind and rain cause is shaken, because rain is dropped on power transmission line changes power transmission line original to the impact of power transmission line
The relatively stable state of some, should not form vibrational spectra, as shown in Fig. 2 the dotted line left side is no rainy periods, vibrational spectra is more,
The right is the period for having rainfall, and vibrational spectra significantly reduces；Two, the frequency spectrum oscillation intensity fluctuation that wind and rain cause is shaken is larger, because continuously
Raindrop ceaselessly apply instantaneous impact to power transmission line, the size of instantaneous impact becomes with the change of wind speed and rainfall intensity
Change, cause the oscillation intensity difference of vibration frequency obvious, and only ambient wind when distal tip signal very weak vibration frequency change,
As shown in Figure 3 and Figure 4, Fig. 3 is the spectrogram in the case of rain, and Fig. 4 is the spectrogram under no rain fall.Caused according to wind and rain
The difference shaken with wind-induced vibration, judge whether rain with algorithm.
Carry out the implementation process of illustration method below in conjunction with accompanying drawing.Opened as shown in Figure 1 for differentiation each span rainfall of transmission line of electricity
The method of time beginning, causes to shake according to wind and rain and the line spectrum of wind-induced vibration is distributed sparse features and both rumble spectrum high frequency changes
Width identifies whether to have rainfall, and methods described comprises the following steps：
S1, Fourier transform is carried out to signal data and obtains frequency spectrum data；
S2, vibrational spectra is extracted, find vibration sparse separation moment t (t1, t2...) of Spectral structure；
S3, HFS oscillation intensity varying width is counted, finds varying width catastrophe point moment T (T1, T2...)；
S4, if ABS (T-t)<10 minutes, it is determined that (T, t) is rainy initial time between the time；Otherwise without rainfall,
Aforesaid operations are repeated, obtain the time that the rainfall of all fronts starts.
Step S2 is specifically included：Statistics transmission line of electricity vibration Spectral structure for a period of time finds out that wind and rain is caused to shake and charming appearance and behaviour is shaken again
The sparse degree mutated site of dynamic line spectrum distribution characteristics, according to the position for being distributed sparse abrupt change record these moment t (t1,
t2...)。
Step S3 is specifically included：Count rumble spectrum HFS (the high-frequency range selection one of transmission line of electricity for a period of time
As be 1/3 times of effective frequency) varying width mutated site, cause to shake according to wind and rain and the rumble spectrum high frequency of wind-induced vibration change
Width mutated site, preceding the 5% of HFS oscillation intensity maximum is chosen, calculating is averagely worth to a, and it is most weak to calculate oscillation intensity
Rear 5% be averagely worth to b, width K=a-b, at the time of record K values become big suddenly.
Step S4 is specifically included：If vibrational spectra sparse mutated site moment and rumble spectrum high frequency varying width mutated site
The time interval at moment is less than ten minutes, then it is assumed that a certain moment between the two moment is the starting point that the span rains.
The inventive method causes to shake to sentence with the vibrational spectra distributional difference of wind-induced vibration and spectrum signature difference according to wind and rain
Break the time that whether each span is rainy and begins to rain, while meet that vibrating Spectral structure suddenly becomes sparse and frequency spectrum HFS
The position that (effective frequency of generally 1/3 times of high-frequency range selection) width broadens suddenly is rainy start time.
It should be appreciated that the part that this specification does not elaborate belongs to prior art.
It should be appreciated that the above-mentioned description for preferred embodiment is more detailed, therefore can not be considered to this
The limitation of invention patent protection scope, one of ordinary skill in the art are not departing from power of the present invention under the enlightenment of the present invention
Profit is required under protected ambit, can also be made replacement or deformation, be each fallen within protection scope of the present invention, this hair
It is bright scope is claimed to be determined by the appended claims.
Claims (4)
- A kind of 1. method for differentiating transmission line of electricity each span rainfall time started, it is characterised in that cause to shake and charming appearance and behaviour according to wind and rain The line spectrum distribution sparse features of vibration identify whether to have rainfall, methods described bag with both rumble spectrum high frequency varying widths Containing following steps：S1, Fourier transform is carried out to signal data and obtains frequency spectrum data；S2, vibrational spectra is extracted, find vibration sparse separation moment t (t1, t2...) of Spectral structure；S3, HFS oscillation intensity varying width is counted, finds varying width catastrophe point moment T (T1, T2...)；S4, if ABS (T-t)<10 minutes, it is determined that (T, t) is rainy initial time between the time；Otherwise without rainfall, repeat Aforesaid operations, obtain the time that the rainfall of all fronts starts.
- 2. the method according to claim 1 for differentiating transmission line of electricity each span rainfall time started, it is characterised in that step S2 is specifically included：Statistics transmission line of electricity vibration Spectral structure for a period of time finds out that wind and rain causes to shake and the line spectrum of wind-induced vibration is distributed again The sparse degree mutated site of feature, these moment t (t1, t2...) is recorded according to the position for being distributed sparse abrupt change.
- 3. the method according to claim 1 for differentiating transmission line of electricity each span rainfall time started, it is characterised in that step S3 is specifically included：Count the rumble spectrum HFS varying width mutated site of transmission line of electricity for a period of time, high-frequency range choosing Generally 1/3 times of effective frequency is selected, causes to shake and the rumble spectrum high frequency varying width mutated site of wind-induced vibration according to wind and rain, Preceding the 5% of HFS oscillation intensity maximum is chosen, calculating is averagely worth to a, calculates most weak rear 5% average value of oscillation intensity B, width K=a-b are obtained, at the time of record K values become big suddenly.
- 4. the method according to claim 1 for differentiating transmission line of electricity each span rainfall time started, it is characterised in that step S4 is specifically included：If between the time at vibrational spectra sparse mutated site moment and rumble spectrum high frequency varying width mutated site moment Every less than ten minutes, then it is assumed that a certain moment between the two moment is the starting point that the span rains.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6427535B1 (en) * | 1999-11-25 | 2002-08-06 | Yokio Sakai | Weather forecasting system |
| CN105319057A (en) * | 2015-11-10 | 2016-02-10 | 昆明理工大学 | Rotary machine state monitoring method based on frequency spectrum sparsity trend |
| CN106226845A (en) * | 2016-08-11 | 2016-12-14 | 国家电网公司 | A kind of method identifying Hail distribution region from OPGW vibration signal |
| CN106646670A (en) * | 2016-09-30 | 2017-05-10 | 国网电力科学研究院武汉南瑞有限责任公司 | Distributed micrometeorological monitoring method for transmission lines |
-
2017
- 2017-05-18 CN CN201710350673.3A patent/CN107421636A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6427535B1 (en) * | 1999-11-25 | 2002-08-06 | Yokio Sakai | Weather forecasting system |
| CN105319057A (en) * | 2015-11-10 | 2016-02-10 | 昆明理工大学 | Rotary machine state monitoring method based on frequency spectrum sparsity trend |
| CN106226845A (en) * | 2016-08-11 | 2016-12-14 | 国家电网公司 | A kind of method identifying Hail distribution region from OPGW vibration signal |
| CN106646670A (en) * | 2016-09-30 | 2017-05-10 | 国网电力科学研究院武汉南瑞有限责任公司 | Distributed micrometeorological monitoring method for transmission lines |
Non-Patent Citations (2)
| Title |
|---|
| 许林汕: "高精度风雨模拟环境下拉索风雨激振试验研究新发现", 《土木工程学报》 * |
| 黄麟: "斜拉桥拉索风雨激振的理论分析", 《同济大学学报》 * |
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Application publication date: 20171201 |