Question

EMM2802 MAYIJUNE 2016 QUESTION B A single phase transformer has a high voltage to low voltage ratio of 10. The following parameters are referred to low voltage side, with a supply of 200V. Equvalent Impedance referred to low woltage side Zev 0.1+jo.s a Load impedance referred to low voltage side R-4000 X-2310 Magnetizing Branch referred to low voltage side Draw an approximate equivalent circut with the given parameters and determine the following: 81 The magnetizing current (), the core loss current (core) and no load 82 The primary current ) 8.3 Voltage on the load, which is on the high voltage side. 8.4 Efficiency of the transformer. current lo on the low voltage s?de 14] QUESTION 9 Draw a neat diagram of connections for carrying open-circut and short arcuit tests on a single phase transformer and show how to determine the following from the tests: 91 the iron loss and copper loss in the transformer at different loads 92 the efficiency at different loads 9 3 the %regulation at different loads at different power factor 9.4 the load in kVA at which the transformer efficiency will be maxumum (2) (151

Answer 1

e 100 doov on load vernd LV 30 231 OYe っ0.ess8/1ổ+0.5đổ 0.9998 9-9439 A

B2 00 40 = 201-36.869" А T-38 6.3 4. 2(204%.ce)-(#qtjs5)

inpu au (19252)(20) cos(34.s46 31sq. 98765 Watヒ 33) 3300 watt 95-7541"/> 3300 inpuk 95-1572%