ANALYSIS OF THE STABILITY OF THE ASYNCHRONOUS GAS BLOWER MOTOR AT NON-FERROUS METALLURGY ENTERPRISES
Keywords:
asynchronous motor, short circuit currents, operation stability, mechanical characteristic, blower, power supply systemAbstract
An important and urgent task is to ensure reliable power supply to responsible con- sumers at non-ferrous metallurgy enterprises. Based on the results of a comprehensive energy audit at an enterprise for the production of lead and zinc, the work examines the operating modes of an asynchronous blower motor (ABM), the reliable operation of which depends on the operation of the entire power supply scheme of the enterprise. Graphs of the change in the power factor in the individual phases of the gas blower are presented. It has been established that during the start-up period, the power factor decreases to a value of 0.2, while at the initial start-up moment there was a frequency deviation from the nominal value by 0.3 Hz. The values of three-phase and two-phase shortcircuit currents are determined according to two circuits with different types and capacities of power transformers (32 MVA and 40 MVA, respectively), as well as types of reactors. Calculation of the stability of an asynchronous blower motor was performed, which consists in constructing the mechanical characteristic of the ABM and estimating the modes of starting the ABM according to the values of dynamic moments. It is established that when the slip changes from 0 to 1 the engine torque changes in the range: from 0 to 3.1, the moment acquires the greatest value when the slip is equal to 0.2. With an increase in slip from 0 to 1, the value of the moment of resistance decreases from a value of 1.0 to 0.15. The construction of the mechanical characteristics of the asynchronous gas blower motor during the reactor start and the multiplicity of the starting current depending on the slip was carried out. It has been established that the highest engine torque (1.074) is observed at a slip value of 0.18. The results obtained in the work can be used in the course of implementing measures to improve the efficiency of using electricity in the power supply system of non-ferrous metallurgy enterprises for the production of lead-zinc products.
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