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A fault is permanent only if the short circuit is still there after the last reclosure.
From 2.5 s single-pole dead time, pole discordance trips all three poles.
Plan value 180 s: shorten it to watch the sequence. In test mode no breaker moves.
| TCMRM | Single-pole dead time | 2 s |
|---|---|---|
| TCTRT | Three-pole dead time | 5 s |
| TRVLRT · TRVBRT | Dead-line · dead-bus closing | 2 s · 2 s |
| TICRT | Criteria changeover | 5 s |
| TDRT | Three-pole cycle disarm | 90 s |
| TB1 · TB2 | Blocking after a closing: fast · slow protection | 3 s · 30 s |
| TR | Breaker recovery after a closing | 60 s |
| PTL/PTB · ATL/ATB | Voltage present · absent | 80 % · 30 % Un |
| ΔU · Δφ · TG | Synchro-check, slip | 20 % · 30° · 3 s |
| TARDMU · TDMU | Undervoltage: arming, tripping | 1 s · 180 s |
| T2 · T3 · T4 | Distance protection, zones 2 to 4 | 0.5 · 1.6 · 2.4 s |
Typical settings of a 225 kV line feeder.
French labels, as in substation control rooms. Hover a line for its IEC 61850 object.
Local control has ended. The National Control Center has returned the substation to its normal configuration.
Nobody does that. But if you want to try, it's at your own risk.