Consider a three-phase generator rated 300 mva 23 kv, Ask an Expert

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Consider a three-phase generator rated 300 MVA, 23 kV, supplying a system load of 240 MVA and 0.9 power factor lagging at 230 kV through a 330 MVA, 23 ?/ 230 Y-kV step-up transformer with a leakage reactance of 0.11 per unit.

(a) Neglecting the exciting current and choosing base values at the load of 100 MVA and 230 kV, find the phasor currents I_A, I_B, and I_C supplied to the load in per unit.

(b) By choosing the load terminal voltage V_A as reference, specify the proper base for the generator circuit and determine the generator voltage V as well as the phasor currents I_a, I_b, and I_c, from the generator. (Note: Take into account the phase shift of the transformer.)

(d) By omitting the transformer phase shift altogether, check to see whether you get the same magnitude of generator terminal voltage and real power delivered by the generator.

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Other Engineering, Engineering

Category:- Other Engineering
Reference No.:- M91897619

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