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CHAPTER 4 PROTECTIVE DEVICES COORDINATION
www.pdhonline.coma set of coordinated cu rves on one composite time-current graph. b. Data required for the coordination study. The following data is required for a coordinatio n study. (1) Sin gle-line diagram of the system under study. (2) System voltage levels. (3) Incoming power supply data. (a) Impedance and MVA data. (b) X/R ratio.