Field Data Accuracy Analysis of Phasor Measurement Unit Application

The existence of the phasor measurement units (PMU) technology provides new approach in understanding the condition of power system compared to the old technology. However, the parameters recorded by the PMU still rely on traditional installed measuring equipment. The measuring equipment has its own level of accuracy which will affect the data credibility for further analysis. Furthermore the accuracy of such data which is obtained from PMU measurement has to be known to be able to use it for future study. In this paper the field data from PMU measurements which is installed in two 500 kV substation facing one another is analyzed and compared with the results from simulation of the system to determine the accuracy of the field data. From the analysis, it can be seen that the field data taken from PMU measurements still have some error caused by the level of accuracy of measuring instruments and measurement systems used.