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Method of installation places and power choice of reactive power compensation devises in traction power supply system in condition of increase freight miles are introduced in this article. Approaches to definition of reactive power optimal criteria with reactive power compensation installation are denoted. Three criteria for estimation of reactive power compensation installation are offer to review. There is provided method of optimality assessment of this choice.

The paper discusses the main limiting factors limiting the volume of transportation of high-volume freight trains. Designated approaches to solving the problems presented by the use of compensating devices. The paper presents the method of selecting installation sites and the power of compensating devices in the traction network, taking into account the growth in traffic volumes, allowing to evaluate the positive effect of the installation of compensating devices on the prospect of increasing traffic volumes. Determination of perspective power consumption is proposed to carry out using power consumption forecasting. To assess the effect of the installation of compensating devices in the traction network, three criteria have been proposed: unloading traction transformers, increasing the voltage level at the consumer, and unloading the power transmission lines.