Frequency characterizations of voltage and current transducers for evaluation of phasor measurement units

This paper describes a phasor measurement unit (PMU) evaluation method and presents the measurement results of the frequency characteristics of an inductive voltage divider (IVD) and a current transformer (CT). Frequency characteristics up to 3 kHz of an inductive voltage divider and a current transformer were evaluated in terms of ph as or measurement units, which play an important role in smart grids. The in-phase components of the inductive voltage divider were less than 0.1 ppm, whereas its quadrature components reached 0.22 ppm at 3 kHz. The in-phase and quadrature components of the current transformer reached approximately 10 ppm at 3 kHz, with large measurement uncertainties. While the frequency characteristics of inductive voltage dividers were found to be sufficient for the evaluation of phasor measurement units, the results show that improvements in the frequency characteristics of current transducers are needed for successful phasor measurement unit evaluation.