2025-07-31
The weight of a 1000kV (kilovolt) transformer depends heavily on its power rating , design type, cooling system, and manufacturer. Voltage alone is insufficient for an exact weight estimate. If you need this power transformer, please contact our company.
1. Power Rating (MVA):
A 1000kV transformer is usually rated for hundreds of MVA (e.g., 500 MVA to 1500 MVA). Higher MVA = larger/heavier components.
2. Type:
- Autotransformers: Lighter (common for EHV/UHV).
- Two-winding transformers: Heavier.
3. Cooling System:
ONAN (oil-natural), ONAF (oil-forced), or OFAF (oil/air-forced) add significant weight.
4. Accessories:
Conservator tanks, bushings, radiators, and oil can contribute 20–30% extra weight.
| Power Rating (MVA) | Approximate Weight (tons) | Details |
|---|---|---|
| 300–500 MVA | 200–350 tons | Core + windings only. Total installed weight may reach 450+ tons with oil/cooling. |
| 800–1000 MVA | 400–600 tons | Typical for major grid interconnections. Installed weight can exceed 700 tons. |
| >1200 MVA | 600–900+ tons | Largest units (e.g., hydropower plants). |
- A 500 MVA, 765kV transformer weighs ~300–400 tons.
- 1000kV (UHV) transformers in China (e.g., 1000 MVA) range from 500–800 tons (excluding oil).
- Total installed weight (with oil, cooling, and accessories) can add 25–40% to core/winding weight.
- Manufacturer specs vary: Hitachi, Siemens, TBEA, or GE designs differ.
- Transport limits: Units often ship disassembled (modules ≤ 400 tons) due to road/rail constraints.
- Voltage ≠ Power: A 1000kV transformer is meaningless without MVA. For example, a 1000kV/1000MVA unit is vastly heavier than a 1000kV/300MVA one.
