When the power is out, you need answers - fast. First, you'll need precise details about what happened and when. The cause could be external or internal, and a single disturbance can initiate a series of actions, adding to the confusion. An electric current travels at nearly the speed of light, and power system events can occur in rapid succession, with just milliseconds in between. Root-cause analysis depends on reconstructing this sequence of events in proper order, with time resolution in milliseconds.
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