Question: Two IDMT type relays have to be coordinated for a feeder fault current of 15000 amps with a coordination interval of 0.3 seconds. The

Two IDMT type relays have to be coordinated for a feeder fault current of 15000 amps with a coordination

Two IDMT type relays have to be coordinated for a feeder fault current of 15000 amps with a coordination interval of 0.3 seconds. The downstream relay is designated as A, and the upstream relay as B. Calculate the TMS setting (to two decimals) of B to achieve coordination based on the data given below. Both relays have characteristics defined by IEC operating curve for Normal inverse type of protection. A is connected to a CT of 800/1 ratio and has a pick up setting of 0.8 pu TMS of 0.20. B is connected to a CT of 1200/1 ratio and has a pick up setting of 0.9 pu.

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