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Exam1_03_Spring-11-Solution

Exam1_03_Spring-11-Solution - EE 255-03 ELECTRICAL...

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ELECTRICAL ENGINEERING DEPARTMENT EE 255-03 EXAM #1 May 2nd, 2011 I have neither given nor received unauthorized assistance during this test. Name (Print)_______________________________ Signature:__________________________ P roblem #1(12 P oints ) A 2000-KVA, 33,000:3,300-V, 60-Hz, single-phase transformer gave the following test results: Voltage Current Power Open-circuit test: 3300V 20A 20KW Short-circuit test 800V 61A 20KW a) Determine the voltage regulation of the transformer for a rated load and 0.8 pf leading at 3300 V side. (Use the approximate circuit.) b) Calculate the efficiency of the transformer for a load of 2000 KVA at 3300 V and 0.8 power factor leading. % . . ) . . ( . . . . ) . ( ) . ( . . ) ( ) ( 5 0 33000 33000 32834 362 1 32834 965 11 375 5 87 36 61 0 33000 (HVS) A 87 36 61 87 36 33 2000 (HVS) 0 33000 V (HVS) 965 11 375 5 115 13 X (HVS) 115 13 61 800 Z (HVS) 375 5 61 20000 1 2 2 2 2 eq eq 2 - = - = ° = + ° + ° = ° = ° = ° = = - = = = = = VR V j V I V R a eq % . * . * ) ( 56 97 100 1640 1600 1640 20 20 1600 1600 8 0 2000 = = = + + = = = η KW P KW P b in out
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ELECTRICAL ENGINEERING DEPARTMENT EE 255-03 EXAM #1 May 2nd, 2011 Problem #2 (13 Points) The magnetic system shown in the figure has a depth of 5 cm. All dimensions shown in the figure are in centimeters.
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