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High tension transmission line ice coating waving monitoring method based on [phi]-OTDR

A high-voltage transmission line, -OTDR technology, which is used in measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problem of lack of efficient analysis methods for transmission lines, and achieve the effect of high positioning accuracy and fast response speed.

Active Publication Date: 2018-02-23
NANJING UNIV
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AI Technical Summary

Problems solved by technology

However, Φ-OTDR has not been widely used in the power industry, and currently there is a lack of efficient analysis methods for galloping in transmission lines

Method used

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  • High tension transmission line ice coating waving monitoring method based on [phi]-OTDR
  • High tension transmission line ice coating waving monitoring method based on [phi]-OTDR
  • High tension transmission line ice coating waving monitoring method based on [phi]-OTDR

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Embodiment Construction

[0029] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0030] A specific embodiment of the present invention is provided below, as figure 1 As shown, the specific process is as follows.

[0031] Step 1. Sensing and monitoring is carried out through the distributed optical fiber sensing system in the power grid, and the distribution of Rayleigh backscattering signals in time and space is obtained, and the original signal diagram is obtained, such as figure 2 As shown, the abscissa is the length of the optical fiber, the ordinate is the time span of an original file, and the gray scale represents the intensity of the power.

[0032] Step 2. Perform Fourier transform on the preset time-length data at each specific distance to obtain the spectrogram of the Rayleigh signal, such as image 3 As shown, the abscissa is the fiber length, and the ordinate is the frequency.

[0033] Step three, in i...

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Abstract

The invention discloses a high tension transmission line ice coating waving monitoring method based on [phi]-OTDR; the method comprises the following steps: using a [phi]-OTDR system to obtain time and space distributions of Rayleigh backscattering signals in a cable; making Fourier transform so as to obtain a Rayleigh signal spectrogram; using a least square method to respectively fitting two straight lines according to end points of fundamental frequency and higher harmonic left and right edges in the spectrogram, thus obtaining an approximation isosceles trapezoid; solving the approximationisosceles trapezoid transmission line space vibration center, and determining a space segment on which ice coating waving may easily happen; stacking components from near DC to the highest frequencyin the spectrogram, continuously reading many frequency spectrums, and splicing a high frequency energy coefficient time-space diagram; extracting a high frequency energy coefficient time domain signal, smoothing and meaning the signal, making Fourier transform so as to obtain a vibration signal period, thus obtaining transmission line waving day and night change rules, and determining the ice coating waving easy happening time period. The method can timely find out and eliminate line operation safety troubles, thus preventing mass economic losses.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a Φ-OTDR-based high-voltage transmission line ice-coated galloping monitoring method. Background technique [0002] At present, optical fiber sensing is gradually favored by the power industry due to its advantages of insulation, anti-electromagnetic interference, high temperature resistance, corrosion resistance, water resistance, easy implantation, and convenient networking, and has become the best in many application fields in smart grid construction. choose. The application technology of quasi-distributed optical fiber sensing in transformer winding temperature measurement, transformer oil temperature monitoring, switch cabinet temperature measurement, and tower tilt monitoring is becoming more and more mature and has obvious advantages. Distributed optical fiber sensing makes full use of the existing idle optical fiber resources in the power optica...

Claims

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Application Information

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IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 张益昕熊菲曹露张旭苹王清单媛媛董嘉赟
Owner NANJING UNIV
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