ProblemSet2

# ProblemSet2 - Problem Set#2 Transformers and per unit value...

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1 Problem Set #2 Transformers and per unit value 2-1 (Grainger and Stevenson, Jr. Chapter 2, Prob. 2.8) A single-phase transformer rated 1.2kV/120V, 7.2kVA yields the following test results: Open circuit test (primary-open) Voltage V 2 = 120V; current I 2 = 1.2 A; power W 2 = 40 W Short circuit test (secondary-shorted) Voltage V 1 = 20V; current I 1 = 6.0 A; power W 1 = 36 W Determine a) The parameters R 1 = r 1 + a 2 r 2 , X 1 = x 1 + a 2 x 2 , G c , and B m referred to the primary side, Fig. 2.7. b) The values of the above parameters referred to the secondary side. c) The efficiency of the transformer when it delivers 6kVA at 120V and 0.9 power factor. Fig. 2.7 Equivalent circuit for a single-phase transformer with an ideal transformer of turns ratio a = N 1 / N 2 . 2-2 (Grainger and Stevenson, Jr. Chapter 2, Prob. 2.10) A single-phase system similar to that shown in Fig. 2.10 has two transformers A-B and B-C connected by a line B feeding a load at the receiving end C. The ratings and parameter values of the components are: Transformer A-B: 500V/1.5kV, 9.6kVA, leakage reactance = 5%

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ProblemSet2 - Problem Set#2 Transformers and per unit value...

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