Difference Between IDMT DT and Instantaneous Relays | Electrical4u

Reformatted Question What is the operating time of an IDMT rela... | Filo

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Q2 An IDMT overcurrent relay has a current setting of 150% and ... | Filo

for the system shown below design the complete oc protection using the idmt relays thus decide the ct ratios the plug settings and the tms at all locations show transcribed image text 97303

. Figure shows a SLD of a portion of power system network. Relays R1, R2, R3,and R4 are standard IDMT relays having normal inverse characteristic. At each bus,the fault level in MVA is mentioned. The PS and TDS of R4 are 100% and 0.1,respectively. The rated current of each relay is 1 A and its PS range is 50%-200% of 1A in step of 25% whereas TDS range is 0-1 in steps of 0.05. Calculate PS and TDS ofrelays R1, R2, and R3. Assume 0.25 s as MCT between two successive relays.