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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