Method for solving unbalanced tension of continuous-span overhead transmission line under single-ended icing

Abstract

The invention discloses a method for solving unbalanced tension of a continuous-gear overhead transmission line under single-end icing. A horizontal stress is supposed, the offset of the suspension insulator string by the step 1 is calculated to increase the span, the offset of the suspension string of each gear is calculated by the step 2, the offset of the insulator string is calculated by the step 3 according to the stress of the overhead line, and the steps 1-3 are repeated to calculate all parameters. If the obtained suspension string offset is close to 0, the requirements are met, the calculation results are received, otherwise, the horizontal stress is assumed again, and calculation is started again through the step 1 until the calculated suspension string offset meets the precisionrequirement. According to the method, a calculation formula of span variation under continuous-span single-end icing is provided, the unbalanced tension after single-end icing is solved by utilizingan 'equal-length line method' model, the requirement of engineering precision can be met, a simple, convenient and practical calculation program can be formed, and the method is suitable for engineering actual calculation.

Description

technical field [0001] The invention belongs to the field of overhead power transmission lines, and in particular relates to a method for solving unbalanced tension of continuous overhead power transmission lines under single-end icing. Background technique [0002] my country is one of the countries with severe icing on transmission lines. After the power grid is strengthened, there are still icing tripping accidents. Through analysis, most of the fault flashover points are distributed at the exits of large spans, large height differences, and high suspension points, and The high hanging end is heavily iced, and the low hanging end is lightly or not covered with ice. In response to this situation, industry technicians proposed that under large spans and large height differences, it is necessary to verify whether the static approach distance when the high suspension end of the deicing ground wire is covered with ice meets the operating clearance. The key to the research on t...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for solving the unbalanced tension under single-end icing of continuous overhead transmission lines in order to solve the problem of complex and incomplete calculation of unbalanced tension under single-end icing in the prior art, It can not only meet the requirements of engineering precision, but also form a simple and practical calculation program, which is mastered by most engineering designers.

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