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4.11)The equivalent circuit parameters of a 150 kVA, 2400 V/ 240 V, 60 Hz transformer are...

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Electrical Engineering

4.11)The equivalent circuit parameters of a 150 kVA, 2400 V/ 240V, 60 Hz transformer are as follows:

RHV = 0.21Ω, RLV = 2mΩ, XlHV = 0.45Ω, XlLV = 4.6mΩ, XmHV =1.6kΩ, and RcHV = 12kΩ.

The transformer delivers to a load, rated current at a powerfactor of 0.85 lagging at rated voltage. Determine the inputvoltage, current, apparent power and power factor, (a) using theapproximate equivalent circuit, and (b) not using the approximateequivalent circuit.

Problem 4.12 For the transformer in problem (4.11), determinethe efficiency when operating with, 1. rated current, rated voltageand lagging power factor of 0.8, 2. 80% of rated current, ratedvoltage, and unity power factor. Problem

4.13 Calculate the voltage regulation of the transformer inproblem (4.11) when delivering,

1. rated current at 0.9 lagging power factor,

2. rated current at unity power factor, and

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