A 150-MVA 15/200-kV single-phase power transformer has a per-unit resistance of 1.2 percent and a per-...

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A 150-MVA 15/200-kV single-phase power transformer has a per-unit resistance of 1.2 percent and a per- unit reactance of 5 percent (data taken from the transformer's nameplate). The magnetizing impedance is j100 per unit. (a) Find the equivalent circuit referred to the low-voltage side of this transformer. (b) Calculate the voltage regulation of this transformer for a full-load current at power factor of 0.8 lagging. (c) Assume that the primary voltage of this transformer is a constant 15 kV, and plot the secondary voltage as a function of load current for currents from no-load to full-load. Repeat this process for power factors of 0.8 lagging, 1.0, and 0.8 leading. A 150-MVA 15/200-kV single-phase power transformer has a per-unit resistance of 1.2 percent and a per- unit reactance of 5 percent (data taken from the transformer's nameplate). The magnetizing impedance is j100 per unit. (a) Find the equivalent circuit referred to the low-voltage side of this transformer. (b) Calculate the voltage regulation of this transformer for a full-load current at power factor of 0.8 lagging. (c) Assume that the primary voltage of this transformer is a constant 15 kV, and plot the secondary voltage as a function of load current for currents from no-load to full-load. Repeat this process for power factors of 0.8 lagging, 1.0, and 0.8 leading.

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