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Unformatted text preview: transfer an impedance from one side to the other? 5) [15 pts] A new 3 transformer has the following selfcooled (OA or ONAN) ratings: Primary: Yconnected, 345 kV, 296 MVA Secondary: Yconnected, 118 kV, 296 MVA Tertiary: connected, 13.8 kV, 77 MVA Binary shortcircuit tests performed at the factory give the following results: Z 12 = 6.21% on 296MVA 345kV base. Z 13 = 55.9% on 77MVA 118kV base. Z 23 = 42.1% on 77MVA 13.8kV base. Find the per unit impedances Z 1 , Z 2 and Z 3 on a base of 100 MVA, 138 kV. These must be provided to your systems studies engineers. It may be helpful to refer to section 2.8 of your text book....
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 Fall '10
 Bonk

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