CN107290043B - Online distributed monitoring method for vibration times of power transmission line - Google Patents
Online distributed monitoring method for vibration times of power transmission line Download PDFInfo
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- CN107290043B CN107290043B CN201710452579.9A CN201710452579A CN107290043B CN 107290043 B CN107290043 B CN 107290043B CN 201710452579 A CN201710452579 A CN 201710452579A CN 107290043 B CN107290043 B CN 107290043B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
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- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a method for distributively monitoring vibration times on a power transmission line, which is characterized in that a frequency spectrum along the power transmission line is obtained by processing signal information, vibration information in the frequency spectrum is extracted, a vibration spectrum with a frequency doubling relation is judged, a fundamental frequency of a frequency doubling group is left, the vibration times are equal to the vibration frequency multiplied by time, and the vibration times of each span of the whole line are obtained by analyzing the frequency spectrum of each span along the power transmission line, so that the distributed vibration times of the power transmission line are monitored. Through the distributed monitoring of the vibration times on the transmission line, the serious damage of the positions under the vibration for a long time can be detected, and an important guiding function is played for vibration prevention of the line.
Description
Technical Field
The invention relates to the technical field of electric power monitoring, in particular to a distributed vibration fatigue damage monitoring and vibration-proof positioning related method of a power transmission line.
Background
Various vibrations of the transmission line have extremely great damage to the line, long-time vibration of the wire can cause fatigue damage to the wire, the service life is rapidly reduced, even the wire is broken, flashover among the wires is caused, and hardware damage is caused. Through distributed detection of the vibration times of the transmission line, the position with frequent vibration and serious damage can be known to be in which span, and the vibration-proof detection method has important significance.
The invention comprises the following steps:
the invention aims to solve the technical problems: the invention provides distributed vibration frequency monitoring of a power transmission line, which is realized by extracting frequency spectrum vibration signal information, processing the extracted information to obtain fundamental frequency, recording total time counted by a file, multiplying the fundamental frequency by the total time to obtain vibration frequency, and executing the same steps on each point of the line to obtain vibration frequency distribution of the whole line.
The technical scheme of the invention is as follows: a method for measuring vibration times of a power transmission line in a distributed mode is characterized by comprising the following steps of: and accessing a communication optical fiber of the transmission line to be detected by using a distributed optical fiber sensor, acquiring vibration spectrum information along the transmission line in real time, and calculating the vibration times of each point of the transmission line by extracting the vibration spectrum information.
The vibration spectrum information comprises vibration frequency and vibration intensity.
The extraction of the vibration spectrum information is to acquire the vibration spectrum along the transmission line, extract the vibration spectrum information in the spectrum through an algorithm, and judge the frequency of the vibration spectrum to leave the vibration spectrum with the frequency multiplication relation of the vibration frequency.
And the calculated vibration times of each point of the power transmission line are vibration frequency spectrums with multiplied frequency relations of the vibration frequencies reserved by an algorithm, and then the fundamental frequency is selected from the multiplied frequency and multiplied by corresponding statistical time to obtain the vibration times.
The method for selecting the vibration spectrum comprises the following steps:
D. the vibration intensity of the point is larger than that of the left n 1 The value of the data, and the point is greater than the right n 1 A value of the individual data;
E. the reference value of the vibration intensity of the point larger than the coefficient k is 2n of the left and right sides of the point 1+1 An average value of the vibration intensities of the data;
F. if the conditions of A and B are satisfied at the same time, the corresponding vibration frequency f is left i And vibration intensity I i Otherwise, discarding.
The method for judging the frequency multiplication frequency comprises the following steps:judging the multiplication relation between the jth frequency and the ith frequency, and finding out the minimum fundamental frequency vibration frequency left by each group of frequency multiplication frequenciesA number.
The mathematical expression of the vibration times is as follows:
wherein T is the total time of statistical data information, T is the vibration times,is the minimum fundamental frequency left by each set of multiplied frequencies.
Compared with the prior art, the invention has the beneficial effects that: and accessing the transmission line communication optical fiber to be detected through the distributed optical fiber sensor to acquire signal information along the transmission line. The frequency spectrum along the transmission line is obtained by processing the obtained signals, vibration information in the frequency spectrum is extracted, the vibration spectrum with the frequency doubling relation is judged, the fundamental frequency of the frequency doubling group is reserved, the vibration times are equal to the vibration frequency multiplied by time, the same operation is carried out on each point of the line, and the monitoring of the distributed vibration times of the transmission line is realized, so that the defects of the prior art are overcome.
Description of the drawings:
FIG. 1 is a control flow chart of the present invention.
Detailed Description
The following describes the implementation of the present invention with reference to the drawings.
The method for monitoring the distributed vibration times of the power transmission line as shown in fig. 1 comprises 4 steps
Measuring vibration signals along the transmission line in real time by a distributed optical fiber sensor;
step two, processing the vibration signal to obtain a vibration spectrum, and recording the counted time t;
step three, processing the data of the step two according to algorithm criteria in the text to step three;
and fourthly, the vibration times are equal to the three times of the time t, and the whole line vibration times distribution is obtained by traversing the whole module for each space point.
The foregoing is merely illustrative of the present invention, and the scope of the present invention is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the scope of the present invention, and therefore, the scope of the present invention shall be defined by the scope of the appended claims.
Claims (1)
1. A method for measuring vibration times of a power transmission line in a distributed mode is characterized by comprising the following steps of: accessing a communication optical fiber of the transmission line to be tested by using a distributed optical fiber sensor, acquiring vibration spectrum information along the transmission line in real time, calculating the vibration times of each point of the transmission line, namely, leaving a vibration spectrum with vibration frequencies in a frequency multiplication relation through an algorithm, selecting a fundamental frequency from the frequency multiplication frequencies, and multiplying the fundamental frequency with corresponding statistical time to obtain the vibration times; the method for selecting the vibration spectrum comprises the following steps: A. the vibration intensity is greater than left n 1 The value of the data, and the point is greater than the right n 1 A value of the individual data; B. the vibration intensity is larger than the coefficient k multiplied by a reference value, wherein the reference value is 2n of the left and right sides of the point 1 An average of +1 data vibration intensities; C. if the conditions of A and B are satisfied at the same time, the corresponding vibration frequency f is left i And vibration intensity I i Otherwise, discarding; the method for judging the frequency multiplication frequency comprises the following steps:judging the multiplication relation between the jth frequency and the ith frequency, and finding out the vibration times of the minimum fundamental frequency left by each group of frequency multiplication frequencies; the mathematical expression of the vibration times is as follows: />Wherein T is the total time of statistical data information, T is the vibration times, and +.>Is the minimum fundamental frequency left by each set of multiplied frequencies.
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| CN201710452579.9A CN107290043B (en) | 2017-06-15 | 2017-06-15 | Online distributed monitoring method for vibration times of power transmission line |
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| CN201710452579.9A CN107290043B (en) | 2017-06-15 | 2017-06-15 | Online distributed monitoring method for vibration times of power transmission line |
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| CN107290043B true CN107290043B (en) | 2023-07-28 |
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