please solve all parts of the question in order. give answer in four decimal places thanks in advance
please solve all parts of the question in order. give answer in four decimal places
thanks in advance
thanks in advance
Please Solve All Parts Of The Question In Order Give Answer In Four Decimal Places Thanks In Advance Please Solve All P 1 (38.09 KiB) Viewed 22 times
Part of a power system is illustrated in the figure below Three synchronous generators are connected in parallel to the same 6.6 KV bus-bars (G1 2 MVA. 0.08 pu: G2 5 MVA O 12 pu, G3 8 MVA, 0.16 pu). The feeder has reactance of 0 125 2 km and is 20 km long. The remote end of the feeder is connected to the primary of a 250 KVA 6600/415 VN transformer, with reactance of 0.05 pu. Select the common power base as 100 MVA GI Feeder Yyo G G3 Part a) Determine the generator (xn") per unit reactance for the given common power base pu pu Xy's pu Calculate the per-unit and absolute values of the fault level and fault current if a three-phase short circuit takes place on the 6.6 KV bus-bars (point 1 in the figure above) Isc - pu Ssc pu KA Isc Se = MVA Xc Part b) Calculate the feeder and transformer per unit reactance (using the base voltage and base power of 6 6 KV and 100 MVA) pu (feeder) p.u. (transformer) Calculate the per-unit and absolute values of the fault level and fault current if a three-phase short circuit takes place on the secondary of the transformer (point 2 in the figure above) Xtra Isc pu. Sec - pu KA Ise = Ssc MVA
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