Tank construction, cooling and voltage regulation define different parts of an oil-immersed transformer order. Chenfan Electric supplies complete units through qualified manufacturing partners to the agreed ratings and site conditions. Its existing product configuration gives buyers a practical starting table for the technical offer.
| Item | Supply configuration |
|---|---|
| Construction | Three-phase, core type, oil-immersed |
| Tank | Hermetically sealed corrugated tank or conservator tank |
| Cooling | ONAN; ONAF where the rating requires it |
| Conductors | Copper or aluminium |
| Voltage regulation | Off-circuit tap changer; on-load tap changer by project |
| Frequency | 50 / 60 Hz |
| Connection | Dyn11, Yyn0 or as specified |
| Design basis | IEC 60076 or the specified project standard |
Match the tank and cooling to the installation
A sealed corrugated tank accommodates oil expansion through its tank walls. A conservator arrangement uses an expansion tank with the specified breather and protection fittings. Select the construction with the required monitoring and maintenance arrangement, rather than treating the two tanks as interchangeable descriptions.
ONAN uses natural oil and air circulation. ONAF adds forced-air cooling where the selected rating requires it. The technical offer should identify the rating stages, fan supply and controls. A cooling designation alone does not establish an order’s rated power.
Carry the test scope into the order
The published routine-test scope includes winding resistance, voltage ratio and vector group, impedance and load loss, no-load loss and current, dielectric tests, tank leakage and oil breakdown voltage. Type tests, special tests and witnessed testing are agreed separately.
For an oil-immersed transformer enquiry, state rated power, HV/LV voltages, frequency, connection, impedance, cooling, tank type, tap changer and loss requirement. Add altitude, installation conditions and destination so the offer can close the remaining configuration choices.
The order-specific nameplate data, arrangement drawing and routine test report then provide the equipment-level record. This configuration table describes actual published supply options; it adds no invented unit rating, measured loss or dispatch result.