Table 4 Case study 1: Actual vs. estimated positive- and negative-sequence Thevenin impedances
From: Relay performance verification using fault event records
Event | Positive-sequence | Negative-sequence | ||
|---|---|---|---|---|
Impedance (Ω) | Impedance (Ω) | |||
Circuit model | Estimated | Circuit model | Estimated | |
4 | 2.82 + j17.90 | 3.62 + j17.35 | 2.91 + j18.03 | 2.94 + j17.09 |
3 | 1.90 + j18.36 | 3.18 + j16.84 | ||
2 | 4.12 + j17.31 | 3.13 + j17.08 | ||
1 | 1.43 + j18.77 | 3.71 + j17.11 | ||