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The area angle is a scalar measure of power system area stress that respondsto line outages within the area and is a combination of synchrophasormeasurements of voltage angles around the border of the area. Both idealizedand practical examples are given to show that the variation of the area anglefor single line outages can be approximately related to changes in the overallsusceptance of the area and the line outage severity.

Synchrophasor monitoring of single line outages via area angle and susceptance