Overhead line sag detection early warning method based on unmanned aerial vehicle magnetic field measurement

Abstract

The invention provides an overhead line sag detection and early warning method based on unmanned aerial vehicle magnetic field measurement. The method comprises the following steps: (1) wirelessly sending the lowest sag position of an overhead line to an unmanned aerial vehicle; (2) controlling the unmanned aerial vehicle to reach the lowest sag position of the overhead line, and collecting ground electric field intensity; (3) extracting a voltage signal and a current signal of the overhead line; (4) filtering high-frequency harmonic interference signals; (5) calculating the size of the sag of the overhead line; (6) judging whether the sag is greater than a sag alarm value or not, if so, sending out a sag large alarm, and entering the step (7); if not, entering the step (7); (7) calculating the sag change rate; (8) judging whether the sag change rate is greater than a sag change rate alarm value or not, and if yes, giving an abnormal sag change alarm; if not, entering the step (9); and (9) judging whether detection is continued or not, if so, returning to the step (1), and if not, ending and controlling the unmanned aerial vehicle to return.

Description

technical field [0001] The invention belongs to the technical field of electric power detection, and in particular relates to a sag detection and early warning method for overhead lines based on the magnetic field measurement of an unmanned aerial vehicle. Background technique [0002] As one of the important components of the power transmission system, overhead lines need to be monitored effectively in real time in order to ensure the safety and reliability of the power system. Sag detection is one of the important contents of transmission line monitoring. If the sag is too small, the load on the tower will be increased, and accidents such as line breakage, tower collapse and string drop may occur; if the sag is too large, the distance between the wire and the ground will Trees, buildings, etc. come into contact and discharge, causing the line to trip and lose power. Since the transmission line has been subjected to the influence of the natural environment for a long time,...

AI Technical Summary

Problems solved by technology

[0003] At present, sag monitoring mainly adopts manual inspection method, image monitoring method, radar sensor measurement method, etc., but these methods are easily affected by the outside world and weather, and the accuracy is not very high. This invention proposes a method based on UAV magnetic field measurement The sag detection and early warning method of overhead lines uses a drone equipped with an electric field strength sensor to collect the electric field strength at the lowest position of the sag of the overhead line, and calculates the actual sag size in combination with other signals. The detection is flexible and convenient, and is suitable for regular Overall detection is also suitable for selective detection

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