Identifying the efficiency decrease factor of motors working under power harmornic in 660V electric mining grids

Purpose. Identify the motors efficiency decrease factor corresponding to various values of load-carrying ratio. Methods. Basing on onsite measurements power harmonic in 660V low voltage (LV) grids Vietnam underground mines, simulations have been done MATLAB and compared with mathematical models. Verifying data will be implemented Lab-measurements carried out pumping system reveal series decreasing factors. Findings. Series factors present relation level total distortion (THD) motor alternative The help mine operators better understanding harmonics impact motors. Originality. proposed simulation may applied all mining diffe-rent input parameters THD. Practical implications. research is identify obtained from operation which work high environment. resulting could utilized recalculate efficiency.