Synchrophasor-based transmission line impedance measurement

Accurate values of transmission line impedance parameters can enhance the efficiency and reliability of power system operation. The parameter values can be calculated using synchronized phasor measurements of voltage and current at the line ends. The objective of this paper is to investigate how the accuracy and uncertainty of the calculated parameter values depends on the level of noise and distortion in the measured signals during different line loading conditions. The investigation is conducted using a laboratory-based transmission line model and measurement system. The details of the test system and operation are presented in this paper.