Abstract
In the analysis of the parameters series of wire cross-sections for the overhead power line design taking into account their development prospects, the author solved the following tasks. The study of the existing parameter, which characterizes and determines the optimization option of the technical and economic model for the design of overhead lines, which allowed showing the unreasonableness of using the economic current density as the basic optimization parameter of the technical and economic model of overhead lines is performed. The wire cross-section as the basic optimization parameter of the technical and economic model of overhead lines is proposed. The scale growth factor of the parameters series of wire cross-sections is obtained by the criteria-based method, which allowed developing an optimum scale of wire cross-sections. Estimation of the statistical characteristics of the distribution of the relative value of wire cross-sections is carried out. The introduced hypothesis of a log-normal distribution law of the current density is tested using the Pearson's chi-squared test for finding the relationship of relative variation of the initial information on the scale growth factor of wire cross-sections. The effect of the optimum scale of wire cross-sections on the regulations of reconstruction, which is due to the load rate and growth variations in the power grid is determined.
Highlights
IntroductionOperation conditions of the electric power industry dictate the need for the power grid (PG)
Operation conditions of the electric power industry dictate the need for the power grid (PG)facilities, including overhead power lines (OL) to be optimally designed, which means economically feasible taking into account the technical parameters and development prospects of facilities
For the OL design, it is necessary to select economically feasible parameter values, which are determined in the implementation of technical and economic models and reflect the specifics and development prospects of the facility
Summary
Operation conditions of the electric power industry dictate the need for the power grid (PG). The research has confirmed the need to take into account the discrete nature of the scale of wire cross-sections to optimize the technical and economic models of OL when designing economically feasible values of OL parameters considering their development prospects. One of the criteria for selecting the optimum option of the OL design is minimum discount costs Given this criterion, as well as the proposed optimization parameter, the technical and economic model of discount costs (Зi) of OL is enhanced, the main feature of which is the change of the analytical relationship of investments in OL with the wire cross-section (F): Зі = (Е + р)(а + вF) + (3I2ρτβ) × F 1 ,. Given the load rate and growth variations over time, economically feasible values of optimization parameters хj, уj are determined using the criteria-based method:. The initial information is represented taking into account the load rate and growth variations, the expressions (8) and (9) will have the form:
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