A method for monitoring sag and stress of DC overhead transmission lines based on magnetic field weakening detection

Abstract

The invention discloses a DC overhead transmission line sag and stress monitoring method based on weak magnetic detection. Multiple detection points are selected on a tower rod, magnetic sensors are placed, and by use of the distribution feature of a transmission line space magnetic field, in a corresponding coordinate system, a fitting linear equation formula between a magnetic field component generated by each transmission line at each detection point and a sag of each transmission line is obtained; and based on this, through coordinate conversion and a magnetic field superposition principle, a system of non-homogeneous linear equations is constructed by use of a differential method, sags of the transmission lines at the two sides of a pole and horizontal stress of the transmission lines can be solved, and finally, the size of stress at any point of the transmission lines is solved so that the sags and the stress of the transmission lines are monitored in real time. According to the invention, through a weak magnetic detection technology, through combination with a wireless communication technology, magnetic signals acquired by the magnetic sensors are uploaded to a monitoring terminal and then the sags and the stress of the lines are calculated in real time through a computer, such that faults can be simply and quickly discovered and eliminated.

Description

technical field [0001] The invention relates to a method for monitoring sag and stress of a DC overhead transmission line based on weak magnetic detection, and relates to the field of transmission line monitoring. Background technique [0002] my country's transmission lines are distributed in a network structure with many branches, and most areas have complex topography and environment, which are easily affected by the meteorological environment. The failure rate of the line is high, and the terrain along the way is changeable, making it difficult to find. Therefore, real-time monitoring of the state of the transmission line is an important guarantee for the stable operation of the power system. However, due to the limitations of certain technical conditions, there is no high-precision real-time monitoring device for the state of the line. Therefore, once a fault occurs on the line, it is necessary to manually search along the line, which increases the difficulty and time o...

AI Technical Summary

Problems solved by technology

[0002] my country's transmission lines are distributed in a network structure with many branches, and most areas have complex topography and environment, which are easily affected by the meteorological environment. The failure rate of the line is high, and the terrain along the way is changeable, making it difficult to find

Therefore, real-time monitoring of the status of the transmission line is an important guarantee for the stable operation of the power system. However, due to the limitations of certain technical conditions, there is no high-precision real-time monitoring device for the status of the line.

Therefore, once a fault occurs on the line, it is necessary to manually search along the line, which increases the difficulty and time of troubleshooting. However, the automatic fault location can be realized by using the distribution network automation system, but the cost is too high to be popularized.

Images