A New Method of Measuring the Parameters of Double-Circuit Transmission Lines Based on Phase-Mode Transformation

For line parameter measurement of double-circuit transmission lines, traditional methods tend to measure positive parameters and zero parameters separately, which makes the measurement process more complex. This paper presents a new measurement method that is based on phase-mode transformation for double circuits, which decouples the line parameters, calculates the mode parameters using the differential equation calculation model, and finally converts the mode parameters into the phase parameters to obtain the line parameters. This method can measure not only the positive parameters and zero parameters of the line, but also obtain the resistance, inductance and capacitance parameters at the same time. The precision of this proposed method is confirmed by PSCAD simulation and the simulation results show that the measurement precision is not affected by the line length and the expected values of the line parameters.