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OPGW ice coating monitoring system and method based on phase sensitive type optical time domain reflection system

An optical time-domain reflection and phase-sensitive technology, which is applied in the direction of measuring devices, measuring resonance frequency, and converting sensor output, etc., can solve the problems of lack of monitoring methods for transmission line icing conditions, etc.

Active Publication Date: 2020-01-14
NANJING UNIV
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Problems solved by technology

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

Method used

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  • OPGW ice coating monitoring system and method based on phase sensitive type optical time domain reflection system
  • OPGW ice coating monitoring system and method based on phase sensitive type optical time domain reflection system
  • OPGW ice coating monitoring system and method based on phase sensitive type optical time domain reflection system

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Embodiment Construction

[0057] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the accompanying drawings and specific implementation examples. Since this solution can be expanded or deformed in many ways, and the devices involved can be replaced with devices of different models with similar functions, this should not limit the scope of protection of this patent.

[0058] see figure 1 and figure 2 , the present invention proposes a phase-sensitive optical time-domain reflectometry system, which includes a narrow linewidth laser 1, a 1×2 fiber coupler 2, an acousto-optic modulator 3, an erbium-doped fiber amplifier 4, a fiber circulator 5, and a transmission Sensing optical fiber 6, arbitrary waveform generator 7, 2×2 fiber coupler 8, balanced light detector 9, data acquisition card 10, computer 11. The components of each part of the system are described as follows:

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Abstract

The present invention discloses an OPGW ice coating monitoring system and method based on a phase sensitive type optical time domain reflection system. A phase sensitive type optical time domain reflection system is used, to obtain distribution of a rayleigh backscattering signal in an overhead earth wire composite optical fiber cable in time and space; Fourier transformation is performed on a rayleigh backscattering signal phase demodulating result, and useless high frequency information is removed through low-pass filtering; a magnitude of a peak value frequency of the first resonance peak on each distance column is obtained according to frequency spectrum information; peak value frequencies of all distance column resonance peaks are spliced into a one-dimensional array and median filtering is performed; probability statistics is performed after long-time measurement, a frequency of a statistics result highest peak is recorded as a resonance frequency of a corresponding position, a confidence interval and a non-confidence interval are obtained according to a resonance frequency variance; a nominal resonance frequency and an actual resonance frequency are obtained through multipletimes of measurement, and an actual ice coating thickness is calculated according to the nominal resonance frequency and the actual resonance frequency calculation, so as to implement a distributed and intelligentized ice coating thickness monitoring method.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, in particular to an OPGW ice-covering monitoring system and method based on a phase-sensitive optical time domain reflection system. Background technique [0002] In the process of power transmission, due to the complex terrain and terrain conditions, the probability of transmission lines encountering line icing is very high, especially in areas with high humidity or prone to snowfall, line icing is prone to occur. The icing of transmission lines seriously threatens the safe operation of the power grid, and will cause major accidents such as line tripping, power failure, galloping damage, line disconnection, and tower collapse. Therefore, the use of effective monitoring technology to monitor the status of long-distance transmission line equipment so as to timely and accurately grasp the operating status of the equipment is to ensure the safe, reliable and economical operation of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B17/02G01H9/00G01H13/00G01D5/353
CPCG01B17/025G01H9/004G01H13/00G01D5/35361G01D5/3538
Inventor 张益昕陈可楠张旭苹张道王顺方行陈晓红王峰
Owner NANJING UNIV
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