I am designing new project sub station with 220 kV / 11 kV, 40 MVA capacity. This project have many recifier sets, which can generate 3rd harmonics. Now I have to select vector group of This transformer. To minimise 3rd harmonics, what care should I take in selection of Transformer Vecrtor group? If it is Y-Y with open Delta tertiary then what should be the rating & voltage of Tertiary Winding?

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For the second gear in a synchromesh system, the drive transfer will be through a) U1, U2, C, F2, and splines b) U1, U2, C, F1, and splines c) U1, U3, D, F3, and splines d) U1, U4, U5, E, F2, and splines

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