Abstract:

Using power electronics devices (nonlinear loads) on electric power systems brings many economical and technical benefits. Nonlinear loads such as converters, inverters and soft starters are widely used in 6kV mining electric grids. However, using nonlinear loads is the main reason of ejecting power harmonics on electric network and leads to voltage and current waveforms distortion. It has great impact on normal operations, safety conditions as well as aging electrical equipment. Therefore, it needs the method to reduce negative effects of harmonics on electrical apparatus. By utilizing ATP simulations, the paper focuses on analyzing the negative effect caused by nonlinear loads’ harmonics on equipment such as capacitor banks, in Nam Mau Coal Company’s 6kV grid. Based on the analysis, the suitable methods will be recommended to eliminate negative effects of harmonics on electrical apparatus.