The following transformer properties are used by the HST Software when sizing transformers and calculated losses. Where an exact Power and Voltage Rating match is not available, the HST Software selects the closest matching Power and Voltage rating:
| HV Rating (kV) | Base S (MVA) | Top S (MVA) | Z% (%) | X/R | LC,% (%) |
| 34.5 | 4 | 4 | 6 | 8 | 0.13 |
| 69 | 6 | 10 | 8 | 15.5 | 0.1 |
| 69 | 12 | 20 | 8 | 18.6 | 0.8 |
| 69 | 18 | 30 | 8 | 23.7 | 0.8 |
| 69 | 24 | 40 | 8 | 27.3 | 0.6 |
| 69 | 30 | 50 | 8 | 29.5 | 0.6 |
| 69 | 36 | 60 | 8 | 34.1 | 0.5 |
| 69 | 42 | 70 | 8 | 34.1 | 0.5 |
| 69 | 48 | 80 | 8 | 34.1 | 0.5 |
| 69 | 54 | 90 | 8 | 34.1 | 0.5 |
| 69 | 60 | 100 | 8 | 34.1 | 0.5 |
| 69 | 90 | 150 | 8 | 42 | 0.4 |
| 69 | 120 | 200 | 8 | 42 | 0.4 |
| 69 | 150 | 250 | 8 | 50 | 0.4 |
| 69 | 180 | 300 | 8 | 50 | 0.4 |
| 115 | 6 | 10 | 8.5 | 15.5 | 0.1 |
| 115 | 12 | 20 | 8.5 | 18.6 | 0.8 |
| 115 | 18 | 30 | 8.5 | 23.7 | 0.8 |
| 115 | 24 | 40 | 8.5 | 27.3 | 0.6 |
| 115 | 30 | 50 | 8.5 | 29.5 | 0.6 |
| 115 | 36 | 60 | 8.5 | 34.1 | 0.5 |
| 115 | 42 | 70 | 8.5 | 34.1 | 0.5 |
| 115 | 48 | 80 | 8.5 | 34.1 | 0.5 |
| 115 | 54 | 90 | 8.5 | 34.1 | 0.5 |
| 115 | 60 | 100 | 8.5 | 34.1 | 0.5 |
| 115 | 90 | 150 | 8.5 | 42 | 0.4 |
| 115 | 120 | 200 | 8.5 | 42 | 0.4 |
| 115 | 150 | 250 | 8.5 | 50 | 0.4 |
| 115 | 180 | 300 | 8.5 | 50 | 0.4 |
| 138 | 6 | 10 | 9 | 15.5 | 0.1 |
| 138 | 12 | 20 | 9 | 18.6 | 0.8 |
| 138 | 18 | 30 | 9 | 23.7 | 0.8 |
| 138 | 24 | 40 | 9 | 27.3 | 0.6 |
| 138 | 30 | 50 | 9 | 29.5 | 0.6 |
| 138 | 36 | 60 | 9 | 34.1 | 0.5 |
| 138 | 42 | 70 | 9 | 34.1 | 0.5 |
| 138 | 48 | 80 | 9 | 34.1 | 0.5 |
| 138 | 54 | 90 | 9 | 34.1 | 0.5 |
| 138 | 60 | 100 | 9 | 34.1 | 0.5 |
| 138 | 90 | 150 | 9 | 42 | 0.4 |
| 138 | 120 | 200 | 9 | 42 | 0.4 |
| 138 | 150 | 250 | 9 | 50 | 0.4 |
| 138 | 180 | 300 | 9 | 50 | 0.4 |
| 230 | 6 | 10 | 10 | 15.5 | 0.1 |
| 230 | 12 | 20 | 10 | 18.6 | 0.8 |
| 230 | 18 | 30 | 10 | 23.7 | 0.8 |
| 230 | 24 | 40 | 10 | 27.3 | 0.6 |
| 230 | 30 | 50 | 10 | 29.5 | 0.6 |
| 230 | 36 | 60 | 10 | 34.1 | 0.5 |
| 230 | 42 | 70 | 10 | 34.1 | 0.5 |
| 230 | 48 | 80 | 10 | 34.1 | 0.5 |
| 230 | 54 | 90 | 10 | 34.1 | 0.5 |
| 230 | 60 | 100 | 10 | 34.1 | 0.5 |
| 230 | 90 | 150 | 10 | 42 | 0.4 |
| 230 | 120 | 200 | 10 | 42 | 0.4 |
| 230 | 150 | 250 | 10 | 50 | 0.4 |
| 230 | 180 | 300 | 10 | 50 | 0.4 |
| 345 | 6 | 10 | 14.5 | 15.5 | 0.1 |
| 345 | 12 | 20 | 14.5 | 18.6 | 0.8 |
| 345 | 18 | 30 | 14.5 | 23.7 | 0.8 |
| 345 | 24 | 40 | 14.5 | 27.3 | 0.6 |
| 345 | 30 | 50 | 14.5 | 29.5 | 0.6 |
| 345 | 36 | 60 | 14.5 | 34.1 | 0.5 |
| 345 | 42 | 70 | 14.5 | 34.1 | 0.5 |
| 345 | 48 | 80 | 14.5 | 34.1 | 0.5 |
| 345 | 54 | 90 | 14.5 | 34.1 | 0.5 |
| 345 | 60 | 100 | 14.5 | 34.1 | 0.5 |
| 345 | 90 | 150 | 14.5 | 42 | 0.4 |
| 345 | 120 | 200 | 14.5 | 42 | 0.4 |
| 345 | 150 | 250 | 14.5 | 50 | 0.4 |
| 345 | 180 | 300 | 14.5 | 50 | 0.4 |
| 500 | 6 | 10 | 14.5 | 15.5 | 0.1 |
| 500 | 12 | 20 | 14.5 | 18.6 | 0.8 |
| 500 | 18 | 30 | 14.5 | 23.7 | 0.8 |
| 500 | 24 | 40 | 14.5 | 27.3 | 0.6 |
| 500 | 30 | 50 | 14.5 | 29.5 | 0.6 |
| 500 | 36 | 60 | 14.5 | 34.1 | 0.5 |
| 500 | 42 | 70 | 14.5 | 34.1 | 0.5 |
| 500 | 48 | 80 | 14.5 | 34.1 | 0.5 |
| 500 | 54 | 90 | 14.5 | 34.1 | 0.5 |
| 500 | 60 | 100 | 14.5 | 34.1 | 0.5 |
| 500 | 90 | 150 | 14.5 | 42 | 0.4 |
| 500 | 120 | 200 | 14.5 | 42 | 0.4 |
| 500 | 150 | 250 | 14.5 | 50 | 0.4 |
| 500 | 180 | 300 | 14.5 | 50 | 0.4 |