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유인근,지화수 國立 昌原大學校 産業技術硏究所 1999 産技硏論文集 Vol.13 No.-
This paper describes the causes of voltage sags in industrial plants, their impacts on equipment operation, and the possible countermeasures. The voltage sags analysis of power systems under faulted conditions provides very important information regarding the sensitivity of different types of industrial equipment, adjustable speed drive controls, programmable logic control, motor contactor and so on. The ability to predict voltage sag characteristics offers a unique opportunity to evaluate alternate configurations and prevent problems with optimum supply and ride-though specifications. Currently, the voltage sags are facing an increasing concern of industrial plants due to increasing automation facilities as electronic controllers, which are more sensitive to voltage sags than other loads. Several countermeasures are chosen and simulated in order to improve voltage sags of industrial plant and the simulation results are discussed in detail.