Home » English riddles » Protection » Protection Riddle No.65 – REF low impedance protection » Reply To: Protection Riddle No.65 – REF low impedance protection Reply To: Protection Riddle No.65 – REF low impedance protection 2021-08-03 at 11:08 am #1834 ASAD I need your help for 2MVA REF setting as per my last query.