This method can detect not only faults in primary substation, but also fault area in radial line between the primary substation and the secondary one (or switching station).

As the international standard for substation automation network communication, IEC 61850 will gradually be used from substation to control center as a primary standard.

This paper presented a Domino model for the primary cause investigation and analysis of power substation operation accidents, which including direct cause, indirect cause, and basic cause.