## A 300-kVA, ll-kV/440V three phase (Y-Y) transformer gave these test results: Open circuit test w...

A 300-kVA, ll-kV/440V three phase (Y-Y) transformer gave these test results: Open circuit test with HV side open: 440V, 20A, 1 3kW; Short circuit test with LV side short-circuited: 630V, 15.75A, 3.1 kW. Determine: a) equivalent circuit referred to HV side; b) equivalent circuit in per unit using the transformer ratings for the base values; c) equivalent circuit in per unit when S_base = 400kVA, and base voltages remain the same.; d) ABCD matrix of the transformer for the equivalent circuit of case c). The 11-kV side of the transformer of Question 2 is connected to generator via a transmission line with ABCD matrix: [0.99 j0.02 0 0.99] in per unit with S_base = 400kVA and V_base = 11 kV. The 440-V side of the transformer is connected to a 3-phase load. The load receives 250kVA at 440V and power factor 0.8. matrix: a) Draw a diagram of the entire system in per unit using S_base = 400kVA and V_base as per transformer ratings. b) Find the combined ABCD matrix of the transmission line and the transformer; c) Find voltage, power and power factor of the generator, first in per unit and then in absolute values.

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Electrical Machines
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Izay Boy
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