Substantiation of the Split Phase Construction of the Overhead Intersystem Power Transmission Lines

Abstract

The requirements for energy saving in power transmission lines are constantly growing, and first of all, regarding the increase in throughput and reliability while simultaneously reducing the consumption of electricity for its transport, reduction of the environmental impact, and the exclusion zone for construction. The search for the ways to solve these problems and simultaneous improvement of the technical and economic indicators of power lines, both overhead and cable, determines one of the most important areas of research work in this field. The introduction of the electricity market also involves increase of the competitiveness of energy supply organizations and reduction of own costs for electricity transport. The choice of economically justified cross-sections of wires, lengths of overhead power lines and nominal voltage of power lines contributes to the solution of the problem. In the conditions of the market economy, the probability of investing capital in one or another investment project is determined by its payback period, profitability, and possible risks of reducing investment profitability. When putting into operaion a new power transmission line, it is necessary to solve the problem of its profitability or unprofitability, and the question of cost compensation within the group of its consumers should be investigated. Suboptimally selected parameters of the power transmission mode, as well as suboptimal design and cross-section of the overhead lines and operational scheme of the electrical grid can lead to unjustified losses of electricity, irrational costs for the construction of additional compensating reactive power devices and, as a result, an increase in the cost price and electricity transmission tariffs , therefore it is necessary to further develop and elaborate the methodology of energy saving in power industry, improve the methods of optimization of the design and cross-section of the wires , develop criteria for the transition to the increased natural power, which will allow to achieve significant cost savings, reduce the relative losses of electricity in the line. The limits of the area of application of the proposed phase line design have been determined with a minimum splitting step with subsequent determination of the wave resistance of the line with verification of the conditions for ensuring the normalized margin of stability when transmitting the maximum power. Phase splitting makes it possible to reduce the inductive resistance and, accordingly, thereby increase the value of the transmitted power in power transmission line. The paper analyzes the conditions of static stability of the intersystem power transmission line as a result of the change of the wave resistance.