Computing method for torsional rigidity of split conductor of overhead power transmission line

Abstract

The invention discloses a computing method for torsional rigidity of a split conductor of an overhead power transmission line. The method comprises the following steps of: firstly, analyzing length change of a sub-conductor due to a torsional movement of the split conductor, and deducing a practical level tension computational formula according to a linear formula of the power transmission line and material property of the conductor when the sub-conductor is torsional; then carrying out a mechanical analysis for a four-split conductor under the action of a torque, in the analysis process, utilizing a characteristic that the split conductor is divided into multiple subspans through a conductor spacer, firstly carrying out a force analysis for the subspans, and finally obtaining a torque balance equation under the action of the torque, and further obtaining a computational formula for the torsional rigidity of the four-split conductor. Finally, summarizing a common computational formula for the torsional rigidity of the split conductor for any split number. In the computing method, the method is adopted to calculate the torsional rigidity of the split conductors with parameters, such as different split numbers and span length and the like, and higher computational accuracy can be achieved, and effectiveness and adaptability of the computing method can be proved.

Description

technical field [0001] The invention relates to a calculation method for the torsional rigidity of a split conductor of an overhead transmission line, which can be used to calculate the torsional rigidity when analyzing and researching the galloping caused by the torsional vibration of the split conductor under the action of wind load. Background technique [0002] The existing methods for calculating the torsional stiffness of split conductors in transmission lines include: [0003] 1) Nigol method. The assumptions made by this method when calculating the torsional stiffness of a split conductor are: a. The mass of the conductor is ignored, that is, the conductor is considered to have no sag; b. The horizontal tension on each sub-conductor is the same and remains unchanged; c. Each section of the split conductor is twisted The splitting circles are the same and unchanged; d. Neglect the mass of the spacer; e. Neglect the elasticity and bending stiffness of the wire; f. The...

AI Technical Summary

Problems solved by technology

The complexity of the torsional stiffness of split conductors and the difficulty of testing are the main obstacles to the research on the galloping of split conductors. The background technology has been introduced. The existing calculation methods for the torsional stiffness of split conductors still have shortcomings such as poor accuracy and inconvenient engineering applications. Therefore, the present invention provides a new, more accurate calculation method for calculating the torsional rigidity of the split wire, which can not only calculate the torsional stiffness of the split wire, but also clearly reflect various factors that affect the torsional stiffness of the split wire, It is convenient to study the influence of various factors on the torsional stiffness, and lays the foundation for further research on the galloping of split conductors

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