Study On Insulator Windage Yaw And Asynchronous Swaying In Transmission Line

The windage yaw in transmission line is a major security hidden danger which affects the normal operation of the power grid. The windage yaw occurred frequently and as long as it happened, the percentage of reclosing the switch successfully is very low. Therefore, it is of great practical value to study the windage yaw in transmission line, which is of great significance to run the power grid safely. Both the windage yaw of insulator strings and the asynchronous swaying in compact lines can be concluded as the problem of windage yaw in transmission lines. Based on the research status at home and abroad, the high-voltage transmission lines were taken as study object. This paper carries on the thorough analysis and research to the problem of the windage yaw of the transmission line. This paper did these work which is listed below:1) This paper conducted finite element analysis on transmission line, to study the result of several suppression methods to windage yaw of insulator strings, such as using a twin or V shaped insulator strings, installing a heavy hammer. Then this paper analyzed effects of these methods. In order to research the amplification effect of gust to the insulator windage yaw angle, a gust amplification coefficient was proposed to modify the rigid straight rod method which used in specification. Gust amplification coefficient of several cases were calculated and influencing factors were studied, which provides some reference basis for the circuit design and gust windage yaw prevention in the future. 2) The key points of establishing finite element model of the compact transmission line were introduced, and the calculation method of the minimum interphase distance was introduced. This paper researched effects of some factors to the minimum interphase distance, such as line span, hanging point elevation, conductor horizontal tension and wind speed. And a simplified formula for calculating the minimum inter-phase distance was proposed. The classical modes of several orders of the compact transmission line are analyzed. Then, the effects of different position and arrangement of the interphase spacer on the asynchronous swaying was studied. According to the asynchronous swaying, some suggestions for the arrangement of the transmission line were proposed. 3) In order to avoid establishing finite element model or reduce the time for solving finite element modeling of the compact transmission line, the windage yaw particle model was proposed. Then the result of this model was verified by comparing the result of the finite element method. Taking the characteristics of the compact transmission lines structure into account, this model was applied to the compact transmission lines windage yaw particle model. As an example, the compact transmission lines windage yaw particle model was calculated and compared with the results of finite element. It is proved that the compact transmission lines windage yaw particle model is feasible for the fast calculation of interphase distance and the minimum distance between phases in asynchronous swaying. 4) In order to calculate the two types of the transmission line windage yaw effectively, the analysis software for the calculating of the insulator strings windage yaw and asynchronous swaying of the was developed. This software consists of user interface module and finite element analysis module. The user interface module provides a friendly user experience, including three-dimensional model display, working conditions file storage, solving progress tips and solving options. This paper developed a FE analyzing module with parametric FE method. The example shows that this analysis software could solve windage yaw in transmission line accurately and conveniently.