Would it be possible to design an entire power system where all 500kv, 345kv, 230kv and 115kv lines are only protected via step distance? No POTT, DUTT, DCB, or any communication between relays- of course very short lines would have differential. Perhaps the real question is- what can theoretically be done to increase the critical clearing time of a large power system? Ie GSU impedance, conductor size, generator inertia... I know this question is off the wall (for North America), but rather in regards to a developing country. Can the laws of physics even allow for this?
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