A method for galloping monitoring of transmission lines based on ground induced voltage

Abstract

The invention discloses a power transmission line galloping monitoring method based on induced voltage of a ground wire. The power transmission line galloping monitoring method based on induced voltage of a ground wire assumes the induced voltage of the nth tower ground wire of one power transmission line to derive the galloping frequency, the galloping amplitude and the galloping position of thewire of the power transmission line, and includes the steps: wave recorders are arranged on the nth tower for recording voltage waveform, and one end of a voltage probe of the each wave recorder is connected to an overhead ground wire insulated from the tower body, and the other end is connected to the tower body; as the each wave recorder is configured with a trigger threshold, when the line works normally, the wave recorder does not record the voltage waveform; when the wire is galloping, the ground wire couples the induced overvoltage, and the wave recorder is triggered to record the voltage waveform; according to the signal analysis and electromagnetic field theory, the coupling coefficient between the overhead ground wire and the wire is calculated, so that the galloping frequency andthe galloping amplitude of the wire can be reckoned; and by means of analysis of the waveforms recorded by the wave recorders on different towers, positioning of the galloping position can be realized.

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 voltage of 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 local s...

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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