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Table 3 Actual vs. Estimated Thevenin impedances at Terminal G for the three-terminal line test scenario

From: Estimating zero-sequence impedance of three-terminal transmission line and Thevenin impedance using relay measurement data

  Source impedance (Ω) Magnitude error (%) Phase angle error (degrees)
  Actual Estimated   
Z G1 3.75 86° 3.78 89.2° 0.80 3.2
Z G2 3.75 86° 3.75 86° 0.00 0.00
Z G0 11.25 86° 11.25 86° 0.00 0.00