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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