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When the Neutral CT is not connected, the Earth Fault protection still operates in Micrologic 6.0 trip unit as it works on the principal of vectorial sum calculation of 3 phases.
In case of Earth Fault, the internal current sensor which makes the vectorial sum, detects the Earth Current and gives a tripping order according to Ig (Earth Fault Current) and tg (Tripping time for Earth Fault) settings.