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Reply To: Protection Riddle No.13 – Setting of earth fault relay

#1321
AMIR KHASHAYAR

    20000/1.73/1.73 NAMELY 6666.6 V IS THE VOLTAGE OVER HALF WINDNG ‘ NOT TWO HALVES WIDINGS. IN THIS CASE THE APPARENT POWER OF HALF WINDING IS 16.66 KVA. THE RELATIONSHIP OF S=1.73 VI CAN NOT BE VIOLATED DUE TO ZIGZAG CONFIGURATION . THIS RELATIONSHIP IS STILL VALID . SO THE CURRENT PASSING THE NEUTRAL IS 8.67 Amp. NOT 15 Amp.Sorry I can’t agree to Mr. Hamid’s idea.