Selection of power supply elements for mine electric locomotive haulage

Abstract

A new method for selecting power supply elements is presented for discussion, which allows for increasing the accuracy of calculations for traction networks and substations for mine electric locomotive haulage. This calculation method allows for taking into account all the main factors that determine the conditions of electric locomotive traction: the productivity and length of haulage sections, track slopes, the size of the train, travel time, etc. Unlike existing methods, the time of movement of the electric locomotive under current during the trip is taken into account separately, which significantly affects the total load value. The calculation completely excludes the subjective method of selecting calculation parameters: cross-sections according to schedules, train placement on the line, the number of simultaneously operating electric locomotives, the number of electric locomotives in starting mode, etc. Load currents are taken as average integral values, related to the time of movement of the electric locomotive under current, and not to the total time of movement or trip. During calculations, it is possible to check not only the magnitude of the overload, but also the duration of its action and the repetition frequency. The new calculation of power supply elements is part of the general calculation methodology for electric locomotive traction. It is based on the initial data for determining the rolling stock elements (number of cars in the train, total number of electric locomotives) and on the calculation of the elements of the movement of the electric locomotive haulage (traction force, speed, current value and travel time). The technical calculation when choosing the most advantageous option includes elements of economic comparison.