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Assume that a 50-Hz, 50-kVA, star-delta transformer bank of vector group Yd11 is accidentally paralleled with...

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Electrical Engineering

Assume that a 50-Hz, 50-kVA, star-delta transformerbank of vector group Yd11 is accidentally paralleled with a 50-Hz,50-kVA, star-star transformer bank of vector group Yy0. Both have abank ratio of 2000/200-V. The equivalent impedances referred to therespective secondaries are ZΔ = 0.1106/60.2° Ω and ZY =0.0369/60.2° Ω. (a) Assuming the load switch to be open, draw theconnection diagram   (3.0 marks). (b) Determine themagnitude of the current circulating in each transformersecondary   (15.0 marks). (c) Express the current in (b)as a percent of the rated transformer current for eachtransformer   (2.0marks).                                                                                 Use the method of mesh analysis applied to the three-phase circuits(marks will not be awarded for using the single-phase equivalentmethod). show all your steps

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