note that the question consist of part a b and c thanks in advance

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note that the question consist of part a b and c
thanks in advance

Note That The Question Consist Of Part A B And C Thanks In Advance 1 (51.25 KiB) Viewed 36 times

Note That The Question Consist Of Part A B And C Thanks In Advance 2 (29.14 KiB) Viewed 36 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, 0.12 pu, G3 8 MVA, 0.16 pu). The feeder has reactance of 0.125 Nikm and is 20 km long. The remote end of the feeder is connected to the primary of a 250 KVA, 6600/415 VIV transformer, with reactance of 0.05 pu Select the common power base as 100 MVA Gi Feeder G2 0 Үy0 9 @ Part a) Determine the generator (Xn!) per unit reactance for the given common power base [3 marks) X;' = Number pu pu Xa= Number pu X;' = Number 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) [4 marks] Iso = Number S = Number p. pu KA 1 = Number S. Number MVA
Part b) Calculate the feeder and transformer per unit reactance (using the base voltage and base power of 6.6 kV and 100 MVA) [3 marks); X = Number p.u. (feeder) Xtr = Number 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) [4 marks] iso = Number pu Sc = Number pu KA Isc = Number S. - Number MVA Part c) Using the text box below, discuss the method of analysis that has to be used in the case of asymmetrical faults. Which are the most important asymmetrical faults (150 words max)? [6 marks) (This question is manually graded)