The effect of measuring system accuracy on power quality measurements in electrical arc furnaces

With more stringent power quality requirements imposed by electric utilities on electrical furnace operators, the accurate measurement of electrical parameters becomes more important. The overall performance of a power quality measurement system is a function of the accuracy of all of its transducers. This paper, through the use of measured electrical arc furnace data, investigates the sensitivity of power quality calculations to the dynamics of instrument transformers and sampling devices. Improved accuracy in measurements with real-time digital compensating filters is demonstrated using the furnace data.