A 200 – 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 impedance is j80 per unit. Find the equivalent circuit referred to the low-voltage side of this transformer. Calculate the voltage regulation of this transformer for a full-load current at power factor of 0.8 lagging. 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.

Question

A 200 – 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 impedance is j80 per unit.

  1. Find the equivalent circuit referred to the low-voltage side of this transformer.
  2. Calculate the voltage regulation of this transformer for a full-load current at power

factor of 0.8 lagging.

  1. 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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