24Brief Equipment Specifications and Data Sheets
24.1 Power Transformers
The following discussion outlines the options available and helps electrical engineers to determine the criteria in his equipment specifications to suit his specific application.
24.1.1 Winding Configurations
The following transformer winding configurations are often mentioned. Only a few of them are used in the plant distribution;
| Y–Δ | The best choice for HV grid transformers, with solidly grounded neutral and lower BIL. Yd11 was the configuration used on our last project for the main 275 kV transformers. Yd1 is equally common. |
| Y–y | Grounded or not grounded. Not used in the power distribution industry, mainly due to their poor performance in establishing stable grounding conditions. |
| Δ–y | The best transformer choice for MV and LV systems: from ... |
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