Technical and economic method for determining the components of underground electric locomotive haulage

Abstract

The usual methods of calculating mine electric locomotive haulage are very simple, convenient for operational calculations and for selecting elements during design. With some assumptions in the generally accepted traction calculations, they become quite elementary. The traction calculation is greatly simplified by introducing the so‑called equal resistance slope, i.e., a track slope such that the traction force when the locomotive moves in the loaded and empty directions is the same. The calculation for checking traction motors for heating becomes elementary if we assume that the current is directly proportional to the traction force of the motor. Significant simplifications are also introduced into the calculations for determining the elements of power supply networks, converter substations, and energy consumption. The simplicity of the calculations is an advantage of the existing methods for calculating underground electric locomotive haulage, especially since in most cases these assumptions and simplifications have little effect on the accuracy of the calculation. However, in some cases the existing calculations are incomplete and do not provide a final answer. This is observed particularly in traction calculations. The task of traction calculations includes determining the elements of electric locomotive haulage rolling stock — the size of the train consist and the adhesive weight of the locomotive.

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