Analysis of Measured Transmission Line Constants

The accuracy of line impedance data has great impact on system analysis. The transmission line constants are the most important element of data needed for the operation of an electric power network. It comprises positive-sequence impedance (Z1), zero-sequence impedance (Z0) and admittance.
The parameters of line constants are conventionally computed by calculation programs, and the measured values of transmission line constants have been utilized as reference data when a newly built generating plant or substation undergoes a commissioning test. More