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Table 2 Estimated vs. Actual Zero-sequence Line Impedance of Line 2

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

Approach Zero-sequence line impedance (Ω) Magnitude error (%) Phase angle error (degrees)
  Actual Estimated   
Approach 1 15.08+j31.44 15.13+j31.33 0.22 0.15
Approach 2   15.12+j31.38 0.10 0.10