Research on Mixed Measurement of Zero Sequence Parameters of Parallel Double Circuit Transmission Lines

For the measurement of zero sequence parameters of the parallel double circuit transmission line, the conventional off-line measurement method cannot meet the need of the zero sequence parameter measurement, this paper presents a hybrid measurement method, by applying a zero-sequence signal on line outage, simultaneous measuring three double-circuit transmission line voltage and current. Accurate measurement of zero sequence parameters and mutual parameters of double circuit transmission lines can be achieved. The simulation results verify the effectiveness of the method.