Polarized light time domain reflection-based power transmission line fault detection system and positioning method

Abstract

The invention relates to a polarized light time domain reflection-based power transmission line fault detection system and a positioning method. The fault detection system comprises a light source, an optical fiber circulator, a polarization demodulator and an optical fiber jumper, and is characterized in that the light source and the polarization demodulator are respectively connected with the optical fiber circulator; the optical fiber circulator is connected with the optical fiber jumper; and the optical fiber jumper is connected with an optical fiber composite overhead ground wire. The positioning method comprises steps: the light source transmits pulsed light entering the optical fiber circulator, the light enters the optical fiber composite overhead ground wire (OPGW) via the optical fiber jumper, the pulsed light continues to generate backscattered light during OPGW transmission process, the scattered light is transmitted back to the optical fiber circulator along the OPGW and enters the polarization demodulator finally, the polarization demodulator carries out polarization state demodulation on scattered light transmitted from each point of the OPGW, and the polarization state of the scattered light of each point on the OPGW is acquired. Through monitoring scattered light polarization state change information in real time and in combination with the prior fault analysis and recognition algorithm, each fault signal of the power transmission line can be analyzed, recognized and positioned.

Description

technical field [0001] The invention relates to a transmission line fault detection system and positioning method based on polarized light time domain reflection, belonging to the field of security monitoring and early warning. Background technique [0002] The transmission line is an important part of the power grid. Because it is exposed in the wild, it is affected by wind and sun, severe winter heat, pollution, lightning shock and other external environments for a long time, which may cause line failure at any time and affect the safe power supply. It will cause a large-scale power outage. Therefore, in-depth study and analysis of the characteristics and mechanism of various types of typical faults on transmission lines, targeted preventive measures, rapid search for sudden faults on transmission lines, elimination of hidden dangers, enhancement of the power grid's ability to resist natural disasters and improve the level of safe operation is of great significance. Con...

AI Technical Summary

Problems solved by technology

[0002] The transmission line is an important part of the power grid. Because it is exposed in the wild, it is affected by wind and sun, severe winter heat, pollution, lightning shock and other external environments for a long time, which may cause line failure at any time and affect the safe power supply. cause widespread power outages

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