309. Three units of 1:5 transformers are connected in A-Y to supply a 3-phase load from a 400 V, 3-phase source. The line voltage on the load side is
310. A normal A ? A connected 3 phase transformer is obtained by Pnnnecting three single-phase transformers I, II and III as shown above.If transformer III is removed, the system, would now operate in"open-delta" mode. Under this condition, if voltage Vab is designated byV/60?, the voltage Vca is
311. A single-phase two-winding transformer shown above in Fig. 8.8, is connected as an autotransformer shown in Fig. 8.9. If the connections of the 100 V winding are reversed as shown in Fig. 8.10, what is the value of the voltage Vi required to be applied across terminals X2 and H2 to obtain the same 400 V output?
312. Two transformers with identical voltage ratings are working in parallel to supply a common load. The percentage impedance of one transformer is higher compared to that of the other. The load sharing between the two transformerswill
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