A single-phase, 10-kVA, 2300:230-V, 60-Hz, two-winding distribution transformer is connected as an autotransformer to step up the voltage from 2300 V to 2530 V.
(a) Draw a schematic diagram of the arrangement showing all the voltages and currents while delivering full load.
(b) Find the permissible kVA rating of the autotransformer if the winding currents are not to exceed those for full-load operation as a twowinding transformer. How much of that is transformed by electromagnetic induction?
(c) Based on the data given for the two-winding transformer in Problem 11.4.1, compute the efficiency of the autotransformer corresponding to full load and 0.8 lagging power factor. Comment on why the efficiency of the autotransformer is higher than that of the two-winding transformer.
A one-line diagram of a three-phase distribution system is given in Figure P11.5.1. Determine the line-to-line voltage at the sending end of the high-voltage feeder when the transformer delivers rated load at 240 V (line-to-line) and 0.8 lagging power factor. Neglect the exciting current of the transformer.
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