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In the Electrical Index, expand the folder hierarchy Electrical Equipment > Converting Equipment > Transformers.
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Right-click a transformer primary winding and on the shortcut menu, select Connections and Tapping.
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On the Transformer Connections and Tapping dialog, select the tab for the winding where you want to make the definitions: Primary, Secondary 1, or Secondary 2.
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Select Tapping required and enter values for the tapping, percentage per step, and number of steps as you require.
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Enter values for other transformer windings as you require by selecting the appropriate tabs.