Exam 1_04_Sp-11_Solution

Exam 1_04_Sp-11_Solution - ELECTRICAL ENGINEERING...

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Unformatted text preview: ELECTRICAL ENGINEERING DEPARTMENT EE 255-04 MIDTERM May 2nd, 2011 I have neither given nor received unauthorized assistance during this test. Name (Print)_______________________________ Signature:__________________________ P roblem #1 (10 P oints ) A 132-KVA, 11,000:2,200-V, 60-Hz single-phase transformer has the following circuit parameters: Primary (HVS) Secondary (LVS) R1 = 6.1 Ω R2 = 0. 3 Ω X1 = 31.2 Ω X2 = 1.2 Ω Rc = 57,300 Ω Xm=124,000 Ω Rc and Xm are HVS parameters. The transformer is supplying at 2,200-V the rated load at 0.95 power factor lagging. Use the approximate circuit to determine: 1. The voltage regulation of the transformer, 2. The all-day efficiency of the transformer for the following load cycle: 12 hours full-load and 0.95 power factor lagging 4 hours 50% full-load and 0.95 power factor lagging. 1 I- + 1 V Ω 10- + ' 2 V Ω 50 j m jX ' 2 I m I Ω = + = Ω = + = 2 61 5 2 1 2 31 6 13 2200 11000 3 1 6 2 2 . ) ( * . ....
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This note was uploaded on 12/19/2011 for the course EE 295 taught by Professor Alishaban during the Fall '11 term at Cal Poly.

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Exam 1_04_Sp-11_Solution - ELECTRICAL ENGINEERING...

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