Assessment of Financial Loss Due to Voltage Sag in an Industrial Distribution System

This paper evaluates the cost associated with the poor power quality issues (i.e. voltage sag). Voltage sag is purely unpredictable in nature due to the random occurrence of faults. If a voltage sag last for only a few cycles (i.e. 50 ms) can show the same effect as outage which can sustain for several minutes. Equipment operating in an industry are sensitive in nature due to the use of power electronics device. These sensitive devices trip even if for a small dip in the voltage profile. In industry, all operating equipment interlinked with each other to form a process. Continuous operation of this process is foremost important because it related to financial benefit in an industry. In this way, the tripping of equipment due to voltage sag is linked with a cost. A mathematical model is developed for the evaluation of cost based on the tripping of sensitive equipment in the real-time chemical industry. This paper come up with a simple mathematical tool for evaluating revenue loss associated with voltage sag so that industrial personal can estimate the losses due to poor power quality and use proper mitigating equipment to avoid further finical loss.