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Machine Problem No.1: Design the protection of a three-phase, 50-MVA, 230/34.5 kV power transformer using available standard CT ratios. The high-voltage side is Y-connected and the low-voltage side is ∆- connected. Specify the CT ratios, and show the three-phase wiring diagram indicating the CT polarities. Determine the currents in the transformer and the CTs. Specify the rating of an autotransformer, if one is needed.

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powsys

  • 1. Machine Problem No.1: Design the protection of a three-phase, 50-MVA, 230/34.5 kV power transformer using available standard CT ratios. The high-voltage side is Y-connected and the low-voltage side is ∆- connected. Specify the CT ratios, and show the three-phase wiring diagram indicating the CT polarities. Determine the currents in the transformer and the CTs. Specify the rating of an autotransformer, if one is needed.