Why does the required fault-clearing time decrease when transmission voltage exceeds 230 kV?
In cases when the voltage of the transmission reaches 230 kV, faults need to be cleared more quickly.
This is due to the fact that higher voltages generate significantly bigger fault currents that can quickly cause equipment to overheat and become damaged, as well as cause severe mechanical stresses and dangerous overvoltages.
Due to the reason that longer fault durations at these levels also raise the risk of system instability & widespread blackouts, protection systems are designed to have shorter clearing periods in order to prevent damage and maintain grid stability.
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