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The 330kV three-phase integrated power transformer ensures low temperature rise of the oil level and windings through precise oil circuit design and guided cooling technology, while avoiding the risk of oil flow inside the transformer being electrified. It is widely used in power grids, northwest China, photovoltaics, wind power, energy storage, hydrogen production, factories and other power fields.
| Parameter | Unit | Value |
| Product Model | – | OSFSZ20-360000/330 |
| Rated Capacity | kVA | 360,000 (360/360/110 MVA) |
| Rated Voltage Ratio | kV | 345±8×1.25%/115/35 |
| Short-Circuit Impedance | % | HV–MV: 10.5; HV–LV: 25; MV–LV: 13 |
| Rated Frequency | Hz | 50 |
| Vector Group | – | YNa0d11 |
| Insulation Level | kV | HV: LI1175/AC510; MV: LI480/AC200; LV: LI200/AC85 |
| Cooling Method | – | ONAF |
| No-Load Loss | kW | ≤87 |
| Load Loss | kW | ≤668 (HV–MV, at 75°C) |
| Temperature Rise Limit | K | Top oil: 55 (corrected to 51 for altitude); Winding average: 65 (corrected to 61 for altitude); Winding hot-spot: 78 (corrected to 74 for altitude) |
| Noise (Sound Pressure Level) | dB(A) | ≤68 (with forced-air cooling engaged, at 2 m) |
A 330 kV electrical transformer should be selected when the project grid or substation operates at the 330kV voltage level and requires voltage step-up or step-down between the transmission network and a lower-voltage system.
This three phase power transformer may be suitable for:
The choice between a 220kV transformer , 330kV transformer or 500kV transformer should not be based only on transmission distance. Buyers should also consider the grid voltage, required capacity, short-circuit level, system connection scheme, expected load and local utility requirements.
For a 330kV ultra high voltage transformer, the correct technical configuration is more important than selecting a standard model from a catalogue. Before production, the following parameters should be confirmed.
| Item to Confirm | Why It Matters |
|---|---|
| Rated capacity | Determines whether the transformer can support the expected continuous and peak load |
| Voltage ratio | Must match the high-, medium- and low-voltage sides of the power system |
| System frequency | Normally specified as 50Hz or 60Hz according to the local grid |
| Number of windings | Depends on whether the project requires two-winding, three-winding or autotransformer construction |
| Vector group | Affects phase relationship, grounding and parallel operation |
| Short-circuit impedance | Influences fault current, voltage regulation and parallel operation |
| Tap-changing method | Determines whether voltage can be adjusted under load |
| Cooling method | Must support the expected load profile and ambient conditions |
| Insulation level | Must meet lightning impulse, switching impulse and power-frequency requirements |
| Loss limits | Affect operating cost throughout the transformer service life |
| Noise limit | Important for substations near residential or commercial areas |
| Installation conditions | Altitude, temperature, pollution and seismic conditions can affect the final design |
Providing these details at the quotation stage helps the 330kV transformer manufacturer prepare a more accurate technical proposal and avoids repeated design changes later.
Liye can configure the 330kV transformer according to the customer’s system and project requirements. Available project-specific options may include:
Customers can provide a transformer specification, single-line diagram or tender document for technical evaluation.
Looking for a reliable 330kV power transformer for a transmission substation, renewable energy plant or industrial power project? Send Liye your technical specification or single-line diagram. Our team will review the system requirements and provide a suitable transformer configuration, technical proposal and quotation.
