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Table 1 Estimated vs. Actual Zero-sequence Line Impedance of Line 1

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 4.98+j10.42 4.99+j10.39 0.19 0.11
Approach 2   4.95+j10.46 0.20 0.22