A Sag Inversion Method for Transmission Lines Based on Electric Field Information

Abstract

The invention discloses an electric field information-based power transmission line sag inversion method. The method comprises the following steps that: 1) power transmission line underground field strength data under a normal condition are adopted as ground field intensity samples, and the sags of a power transmission line corresponding to the ground field intensity samples under the normal condition are adopted as the feasible solutions of a tabu search algorithm, and then, a tabu table is constructed; 2) actual power transmission line underground field strength data are obtained, when the difference of the actual power transmission line underground field strength data and any one of the ground field intensity samples in the tabu table is smaller than a preset value, a feasible solution of the tabu search algorithm which is corresponding to the ground field intensity sample is adopted as the actual sag of the power transmission line, otherwise, the method shifts to step 3); and 3) the neighboring solutions of the plurality of the feasible solutions of the tabu search algorithm are generated, and the tabu table is updated, and the method shifts to step 2). With the method adopted, the sag of the power transmission line can be obtained through inversion based on the underground field strength data information of the power transmission line.

Description

technical field [0001] The invention belongs to the technical field of power grid safety and maintenance, and relates to a sag inversion method for transmission lines based on electric field information. Background technique [0002] Sag is an important parameter for the operation and maintenance of transmission lines, which is related to the safety and stability of the power grid. Therefore, the size of the sag during line design and operation must be within the specified range. However, since the transmission line will be affected by the line load and ambient temperature, the sag of the line will change continuously. For example, increasing the capacity of the line will cause the temperature of the wire to rise, resulting in elongation of the wire and an increase in sag; ice coating on the wire will increase the specific load of the line, resulting in an increase in sag. These factors may cause potential accidents. Therefore, it is necessary to check and monitor the sag t...

AI Technical Summary

Problems solved by technology

As the height of the sag from the ground changes, the ground field strength will change accordingly. Therefore, the field strength information can be obtained by using the ground field strength measurement technology, so as to invert the sag. With fewer field strength parameters, there is no need to change the line. A more accurate sag value can be obtained, and it is not easily affected by the surrounding environment, weather and other conditions, but there is no technology in the prior art that can invert the sag of transmission lines through ground field strength

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