| Brand | ROCKWILL |
| Model NO. | Generator Step-Up Transformer for Hydro Power Plant-500kV |
| Rated frequency | 50/60Hz |
| Series | GSU |
840MVA/500kV GSU (Generator Step-Up) transformer for hydroelectric power plants boosts generator low voltage to 500kV for efficient long-distance grid transmission. Designed with moisture-resistant insulation, sealed tank construction, and corrosion-resistant components for demanding hydro environments.
Features low noise operation, 30-year design life, compact powerhouse layout, and grid-compatible voltage regulation for stable integration of clean hydropower into the main grid.
| Parameter | Value |
|---|---|
| Rated Power | 840 MVA |
| High Voltage (HV) | 500 kV |
| Low Voltage (LV) | 13.8 kV / 20 kV |
| Rated Frequency | 50 / 60 Hz |
| Number of Phases | 3 |
| Vector Group | YNd11 |
| Short-circuit Impedance | 16% |
| HV Insulation Level (LI / AC) | 1550 kV peak / 680 kV |
| LV Insulation Level (LI / AC) | 95 kV peak / 38 kV |
Power transformers are classified by insulation and cooling method, voltage function, and core structure. By insulation and cooling, they fall into liquid-insulated (oil-immersed) and dry-type — oil-immersed transformers dominate transmission applications up to 345 kV and above with standardized cooling like ONAN, ONAF and OFAF, while dry-type transformers are primarily used indoors at lower voltages up to 35 kV.
By voltage function, they are divided into step-up transformers (used in power plants to raise generator voltage to transmission levels), step-down transformers (used in substations to reduce transmission voltage for sub-transmission or distribution), and autotransformers (employed for fixed-ratio system interconnections, offering high efficiency in transmission grids). By core structure, they include core-type transformers (with windings surrounding core limbs, common in EHV applications) and shell-type transformers (with core surrounding the windings).
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