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Problems of Electricity Quality at Modern Mining and Processing Plants

The article considers issues of introducing electricity quality indicators using the example of one of the largest mining and processing plants in the Russian Federation. To provide reliability, efficiency and electromagnetic compatibility of the main consumers, the company is equipped with its own power generation units, as well as capacitor banks of significant power, capable of maintaining the power factor within the specified limits. The use of asynchronous motors with a phase rotor and a liquid rheostat in mill electric drives made it possible to abandon expensive frequency converters and provide an acceptable quality of electricity. When installing capacitor banks with current-limiting reactors at the design stage, the harmonics of low-voltage converters and subsequent resonant phenomena were not considered leading to significant current overloads above the acceptable level and the destruction of capacitors. As a way out of this situation, the authors propose to include additional inductors in a row with current-limiting reactors and subsequent adjustment of filters to suppress the extreme lower harmonics (5,7,11) from the canonical series. The economic effect and payback period from the introduction of the proposed solutions is determined, firstly, taking into account the increase in the time of guaranteed, trouble-free operation of capacitor banks due to the exclusion of current overloads, reducing electricity losses from reactive power flows, and, secondly, additional costs for the installation of filter reactors.