A method for monitoring transmission line galloping based on OPGW ground wire induced current

Abstract

The invention discloses a transmission line galloping monitoring method based on OPGW ground wire induced current. It is assumed that the galloping frequency, galloping amplitude and galloping position of a transmission line conductor need to be deduced by measuring the induced current on an OPGW ground wire of an N-th base tower of a transmission line. The transmission line galloping monitoring method comprises the following steps that a current transformer is installed on the OPGW ground wire of the N-th base tower, and the output end of the current transformer is connected with wave recorders; the wave recorders are provided with a trigger threshold value, and the wave recorders do not record waveforms when the line works normally; and when the conductor gallops, the OPGW ground wire iscoupled with induced overcurrent, the wave recorders are triggered and record the current waveforms; according to signal analysis and an electromagnetic field theory, the coupling coefficient betweenthe OPGW ground wire and conductor is calculated, so that the galloping frequency and galloping amplitude of the conductor are calculated; and by analyzing the waveforms recorded by the wave recorders installed on different towers, the galloping position is located.

Description

technical field [0001] The invention relates to the field of high-voltage technology, in particular to a method for monitoring galloping of transmission lines based on induced currents of OPGW ground wires, which is used for monitoring galloping of overhead transmission lines. Background technique [0002] Overhead transmission lines will be affected by natural conditions during operation, and many disasters and accidents will occur, and galloping is one of the more serious hazards. Overhead transmission line galloping is a self-excited vibration phenomenon with low frequency (about 0.1-3Hz) and large amplitude (up to 10m or more) generated by the wire under the excitation of wind. The harm caused by galloping is multifaceted. The light ones will cause flashover and tripping, and the severe ones will cause damage to hardware and insulators, wire breakage, wire breakage, tower bolts loosening, falling off, and even tower collapse, leading to major power grid accidents. The l...

AI Technical Summary

Problems solved by technology

[0003] At present, the galloping of transmission lines is mostly monitored by analyzing live video images of transmission lines. However, the distance that can be monitored by this method is relatively short, and the calculation of analyzing video images is complex and takes a long time.

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