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Reply To: Grounding Riddle No.1 – Earth fault in no earthed system

#1132
Hamid

    Thank you very much for your nicety. You are right, unfortunately I mistake in over voltage factor writing (1.73 time is correct), but according to symmetrical phases-diagram we can to estimate the amount of rms voltage of healthy phases obviously. In regard to star point floating voltage in unearthed system, when one of three phases is grounded, other phase-earth voltage increase 1.73 times related to normal condition and this phenomenon can be caused the new earth fault in other weak point of electrical system.