Electrical machines –I

A 200 kVA distribution transformer has core loss of 2000 watts and full load copper loss of 3000watts.In a day it is loaded as follows: 8 hours-200 kVA at UPF. 4 hours -150 kVA at 0.6 pf lag. 4 hours – 100 kVA at 0.8 pf lag. Find the all day efficiency. The primary and secondary voltages of an auto transformer are 500V and 400V respectively. ................
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