Software package for analysis and design of overhead power transmission line structures

Abstract

The article describes an algorithm for calculating wires and cables implemented by determining the loads on the supports, taking into account the compatibility of deformations of structural elements of an overhead power line (overhead line), atmospheric conditions and the profile of the route for all possible modes of operation of overhead lines. Wires and cables are exposed to the load from their own weight, as well as additional impacts in the form of horizontal wind load and the weight of icy deposits. Using the reduced equation of state of the wire (lightning-proof cable), the amount of tension in the operational state is determined if the voltages in the initial state and the values of loads and temperatures are known. It is revealed that for small spans, the voltage value is greatly influenced by temperature, and for large spans by load, which means there must be such a boundary (critical) span value at which the influence of temperature and load on the voltage value will be the same. As a result, software has been developed to solve the problem of determining the stress-strain state of wires and cables and collecting loads on overhead line supports. The developed calculation subsystems can function independently or be included in the software package as components written in the algorithmic language FORTRAN. In contrast to the traditional calculation, emergency loads for anchor-corner supports are determined not only in the ice regime, but also at minimum and average operating temperatures. The calculation in the software package allows us to consider the alternate breakage of all phases of wires and cables in both the left and right spans.