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Reply To: Protection Riddle No.11 – Earthing point location

#1244
Hamid

    Yes you are right. In main substation, selection of earthing transformers location prevents ground fault protection operation against main busbar earth faults, indeed because of moving of earthing point from star connection of power transformer to switchgear, the related ground fault relays can not have proper responds against earth faults in main bus bars and that protection behave as a restricted earth fault inherently.