Transcription of CHAPTER 4 PROTECTIVE DEVICES COORDINATION
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CHAPTER 4 PROTECTIVE DEVICES COORDINATION
TM 5-811-144-1 CHAPTER 4 PROTECTIVE DEVICES series DEVICES from the load to the source areWhere there are two or more series PROTECTIVE de-vices between the fault point and the power supply,these DEVICES must be coordinated to insure that thedevice nearest the fault point will operate first. Theother upstream DEVICES must be designed to operatein sequence to provide back-up protection, if anydevice fails to respond. This is called selectivecoordination. To meet this requirement, protectivedevices must be rated or set to operate on minimumovercurrent, in minimum time, and still be selectivewith other DEVICES on the system. When the aboveobjectives are fulfilled, maximum protection toequipment, production, and personnel will beaccomplished. As will be seen later in this CHAPTER ,protection and COORDINATION are often in directopposition with each other. Protection may have tobe sacrificed for COORDINATION , and vice versa.
a 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.
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