Home » English riddles » Protection » Protection Riddle No.11 – Earthing point location » Reply To: Protection Riddle No.11 – Earthing point location Reply To: Protection Riddle No.11 – Earthing point location 2021-08-03 at 11:08 am #1465 V.Ambarani I feel the earth fault relay 51-N shall be connected in series with resistor for detection of earth fault