Novel power transmission line lightning stroke point locating method based on OPGW (optical fiber composite overhead ground wire) light polarization state

Abstract

The invention relates to a power transmission line lightning stroke point fault locating method, in particular to a novel power transmission line lightning stroke point locating method based on the OPGW (optical fiber composite overhead ground wire) light polarization state. According to the method, fault points are located accurately by extracting the moment at which polarization state mutation information of transmission light in OPGWs at lightning stroke points is transmitted to polarization demodulation equipment with an iteration SVD (singular value decomposition) algorithm in combination with a generalized mathematical morphology method, a wavelet analysis method and the like through lightning stroke OPGW tests. According to the method, the Faraday effect is applied to power transmission line fault location, the effect that the location accuracy is interfered by factors such as transition resistance, line parameters, system running modes, traveling wave transmission dispersion, traveling wave speeds and the like in traditional fault location methods is avoided, and the location accuracy is very high. All that is required is to perform monitoring at two ends of a line during location, so that the input cost is reduced.

Description

technical field [0001] The invention relates to a fault location method for a lightning strike point of a transmission line, in particular to a new method for locating a lightning strike point of a transmission line based on an OPGW optical polarization state. Background technique [0002] With the construction of smart grid, the integration of power transmission network and communication network has become the main development trend. Optical Fiber Composite Overhead Ground Wire (OPGW) is widely used in power systems because of the addition of optical units on the basis of ordinary ground wires, which has the functions of lightning protection and power system communication. In practice, when the OPGW is struck by lightning, damage, broken strands, and even fiber damage often occur, seriously affecting the operation of the power grid and real-time data transmission. [0003] At present, the existing transmission line fault location methods are divided into principles, mainly...

AI Technical Summary

Problems solved by technology

Because the traveling wave method has higher positioning accuracy than the fault analysis method, it is currently widely used in the distance measurement of transmission lines. However, the field operation experience shows that sometimes the traveling wave method cannot accurately distinguish the fault point and the high-frequency transient transmitted from the remote end. State traveling wave, which causes a large positioning error or even positioning failure

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