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Answer Posted / vishwanath chothe
Grounding a motor star point will create an earth path for earth leakage current to flow through that motor's star point. If there are 10 motors in a process plant and their star points are all grounded, there are 10 additional paths for earth leakage currents to flow through.
If all the motors' star points are grounded in this way the earth fault current detections by the protection relays will be complicated and likely they will trip at the incorrect locations because earth fault currents are flowing in many directions toward multiple grounded neutral points.
Therefore the electrical consumers (ie the load, including the capacitor banks), even if they are star connected, are not to be grounded.
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