Comparison on the Method of Transmission Line Positive Sequence Impedance Measurement
Parameters of transmission line are basis for power system calculation with significant importance.The traditional methods have many shortcomings they can′t get accurate parameters of lines,especially for the parameters of zero-sequence self-impedance and transimpedance.This paper describes measuring methods for transmission line parameters first.For measuring the positive sequence impedance,through built mathematic model,derives two-terminal information algorithm based on long-line equation;then by the PSCAD emulation defines the application range for both one-terminal and two-terminal information algorithm.