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I would like to know if a 4 pole, 630 Amp MCCB, rated with a 50kA breaking capacity @415 VAC needs to be replaced if it is connected as a 350 kVA DG feeder CB to a 415 VAC, 3 ph 4 W, 3000 Amp (80kA for 1 sec) bus. If yes, why, and if no why not? Please give your answers with clear cut reasons. As further info, please note that the 3000 Amp bus is also fed thro a 6.6 / 0.415 kV, 2 MVA transformer with a 6.8% impedance that can be isolated through a 4000 amp 4 pole ACB, with a breaking capacity of 80 kA.
Could you also give me the procedure to calculate the fault current that will be seen by the bus in this query?
Could you also give me the procedure to calculate the fault current that will be seen by the bus in this query?