An overhead line bending stiffness measuring device

Abstract

The invention discloses an overhead line bending rigidity measuring device. The overhead line bending rigidity measuring device comprises an overhead line testing table and two counterforce supports for fixing two ends of an overhead line; the two counterforce supports are respectively positioned at two sides of the overhead line testing table; the overhead line testing table is provided with a force measuring mechanism; the force measuring mechanism is connected with a midpoint of the overhead line and applies a horizontal force to the overhead line; the displacement value and the horizontal load of the midpoint of the overhead line are measured by an overlapping disc, a first tension sensor and a displacement scale which are arranged on the force measuring mechanism; the tension of the overhead line is measured by a second tension sensor horizontally connected with the measured overhead line, and the length of the overhead line and data tested by the device are substituted into a formula so as to calculate the bending rigidity of the overhead line. The device disclosed by the invention has the advantages that the influences on displacement measurement because of the torsion of the overhead line are eliminated, the axial tension of the overhead line can be accurately regulated to the set value in measurement, the experiment efficiency and the testing accuracy in actual application are higher, and the problem that the bending rigidity of the overhead line is difficult to be determined accurately is successfully solved.

Description

technical field [0001] The invention relates to a measuring device, in particular to a measuring device for the bending stiffness of overhead wires. Background technique [0002] In the design of overhead transmission lines, it is usually assumed that the overhead line is a flexible cable without bending stiffness. For overhead lines with large spans, the bending stiffness of the overhead lines has little effect on the stress and sag of the overhead lines. Assuming that the calculation is performed, the stress and sag of the overhead line obtained are very different from the actual ones. In addition, when calculating the stress at the outlet of the overhead line clamp, the influence of bending stiffness is not considered, and the correct result cannot be obtained. Therefore, the accurate measurement of the bending stiffness of the overhead line is of great significance for the calculation of the stress sag of the small span overhead line and the accurate analysis of the lo...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to propose a measuring device for the bending stiffness of overhead wires, which can solve the problem that the bending stiffness of overhead wires cannot be accurately determined at present

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