Figure 6. Schematic of an adequate OPP model

From

Highlighting the Deficiencies in Some Existing Optimal PMU Placement Techniques

Emmanuel U. Oleka, Evelyn R. Sowells, Gary L. Lebby

American Journal of Electrical and Electronic Engineering. 2017, 5(4), 120-125 doi:10.12691/ajeee-5-4-1