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500kV power transformers are mainly used for long-distance transmission and distribution of electric power. They convert high voltage into voltage levels suitable for urban power supply networks or specific equipment, ensuring the stability and reliability of power transmission.
| Parameter | Unit | Value |
| Product Model | – | ODFS22-334000/500-NX1 |
| Rated Capacity | kVA | 334,000 (334/334/100 MVA) |
| Rated Voltage Ratio | kV | (525/√3)/(230/√3±2×2.5%)/36 |
| Short-Circuit Impedance | % | Measured: HV–MV approx. 18.0 (at main tap) |
| Rated Frequency | Hz | 50 |
| Vector Group | – | Ia0i0 |
| Insulation Level | kV | HV: SI950/LI1175/AC510; MV: LI480/AC200; LV: LI200/AC85 |
| Cooling Method | – | ONAN/ONAF (70%/100%) |
| No-Load Loss | kW | ≤87 (guaranteed design value) |
| Load Loss | kW | Measured: HV–MV approx. 531 (at 75°C) |
| Temperature Rise Limit | K | Top oil: 55; Winding average: 65 |
| Noise (Sound Pressure Level) | dB(A) | Measured: 61 (no-load, at 0.3 m) / 63 (loaded, at 2 m) |
The Liye 500kV Electric transformer is designed for extra-high-voltage power transmission and large-scale grid applications. Model ODFS22-334000/500-NX1 has a rated capacity of 334,000kVA and a rated voltage ratio of (525/√3)/(230/√3±2×2.5%)/36kV. It operates at a rated frequency of 50Hz and uses the Ia0i0 vector group.
Reliable insulation is essential for a 500kV transformer operating in an extra-high-voltage system. This model is designed with the following insulation levels:
These insulation parameters help the extra high voltage transformer withstand switching impulses, lightning impulses and power-frequency voltage stresses during grid operation.
The ultra high voltage transformer adopts an ONAN/ONAF cooling system. Natural oil and air cooling supports approximately 70% loading, while forced-air cooling allows the transformer to operate at 100% rated capacity. This combined cooling configuration helps control operating temperature under different load conditions.
The guaranteed no-load loss is no more than 87kW, while the measured HV–MV load loss is approximately 531kW at 75°C. The top-oil temperature-rise limit is 55K, and the average winding temperature-rise limit is 65K. These parameters are important for evaluating transformer efficiency, cooling performance and long-term operating reliability.
A 500kV transformer is mainly used where large amounts of electrical energy must be transmitted over long distances. It converts extra-high voltage into voltage levels suitable for regional transmission networks, urban power supply systems and downstream electrical equipment.
Typical applications include:
Liye combines transformer design, manufacturing, testing and project support to serve large-scale power transmission projects. Each 500kV power transformer can be configured according to the required capacity, voltage system, cooling performance, insulation standard and operating environment.
From technical confirmation and production to factory testing and delivery, our engineering team works with customers to ensure that the transformer meets the agreed project requirements.
