Home » English riddles » Protection » Protection riddle no. 10 – Differential protection and auto transfer system » Reply To: Protection riddle no. 10 – Differential protection and auto transfer system Reply To: Protection riddle no. 10 – Differential protection and auto transfer system 2021-08-03 at 11:08 am #1416 V.K. Nambiathiri There shall be no fault current if E/F occures in M.V. side delta winding