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Reply To: Grounding riddle No.5 – Earthing transformer

#1344
Hamid

    With above connection, the secondary current can be calculated by multiplying the transformer primary current times the transformer ratio. This is the current through the grounding resistor, and its value establishes the continuous current rating of the grounding resistor. The voltage across the resistor under ground-fault conditions is 1.73 times the secondary volltage of the grounding transformer bank (190V for 110V rating). Therefore, I think correct answer is 5 A.