Transformer Data Tab Exercise

Compute the parameters for a 5000 VA, 200/400 V, 50 Hz three-phase two-winding fault transformer model: based on the short circuit test, the winding resistance per phase is computed to be 0.028 pu while the reactance is found to be 0.0285 pu.

From the open circuit test, the no-load power is found to be 150 W for positive sequence and 130 W for zero sequences. The excitation current is found to be 4% of the nominal value.

Use the Transformer data tab in Z-based transformer Parameter Form. Before proceeding to the Transformer data tab, make sure to complete the information in the following table using data from the manufacturer.

Solution:

• Open HYPERSIM
• Open the transformer Parameter Form and select the Transformer Data tab.
• Set the Units to PU. Then, verify if the values in your table match.
• After verifying these values, enter them in the Transformer Data tab.
• Fill in all fields with the information available from the manufacturer.
• Click the Compute Electrical Data icon (first icon under Transformer data Tab).
• In the transformer data report, you should have the results required.
• Finally, use a regular two-winding transformer model with the parameters given in the question and compare the results.