Tutorial on Distance and Over Current Protection
Tutorial on Distance and Over Current Protection Philosophy Zone Direction Protected Reach Time Setting (s) Zone 1 Forward 80 % of the PL Instantaneous Zone 2 (for 400kV and above) Forward For Single Circuit – 120 % of the PL 0.35 For Double Circuit – 150 % of PL 0.5 to 0.6 – If Z2 reach overreaches 50% of the shortest line;
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