Technical specifications
| Parameter | Value |
|---|---|
| Product Type | Three-Phase Oil-Immersed Distribution Transformer |
| Rated Capacity | 15 kVA – 31500 kVA |
| Input Voltage | 11 / 33 kV |
| Output Voltage | 400 / 415 V |
| Frequency | 50 / 60 Hz |
| Phase | Three |
| Winding Material | Copper / Aluminium |
| Coil Structure | Fully Sealed Construction |
| Vector Group | Dyn11 / Yyn0 / Yd11 / YNd11 / Dyn5 |
| Service Life | 20–30 Years |
| Standard | IEC / GB |
| Certification | IEC, CE, ISO9001, ISO14001, ISO45001, CQC, GOST, EAC |
| Packing | Wooden Case |
| Package Size | 280 × 200 × 250 cm |
| Gross Weight | 5400 kg |
Specifications are based on the standard configuration. Final ratings, dimensions, materials and packaging are confirmed on the approved drawing and order confirmation.
Features and construction
The hermetically sealed steel tank with corrugated cooling fins isolates the transformer oil from air, preventing oxidation and moisture ingress while dissipating heat efficiently. High-voltage porcelain bushings and low-voltage terminals are mounted on the tank cover, and the structure carries pressure-relief and oil-level protection. The result is stable, low-loss operation with very little routine service.
Typical applications
Outdoor and indoor power distribution for utilities, industrial plants, mining, oil fields, commercial complexes and rural electrification networks requiring reliable step-down from medium voltage.
Customisation options
Capacity, voltage ratio, vector group, winding material (copper/aluminium), tap changer (off-load / on-load) and bushing configuration are customizable to project requirements.
Ordering information
- Selling Unit: Single item
- Packing: Wooden case, 280 × 200 × 250 cm, 5400 kg gross
- Standards: IEC / GB; certified IEC, CE, ISO9001/14001/45001, CQC, GOST, EAC
Specifications are based on the supplied product data. Final dimensions, materials, colors, and packaging are subject to the confirmed sample and order confirmation.
Standards and quality
Manufactured under an ISO 9001, ISO 14001 and ISO 45001 certified management system. Designs follow the IEC 60076 / IEC 62271 series as applicable, with ANSI/IEEE, GB and GOST variants available. Every unit passes routine testing before dispatch; type tests and customer or third-party witnessed factory acceptance tests can be arranged.
Frequently asked questions
What is the rated capacity of the 11/33kV to 400/415V Outdoor Three-Phase Oil-Immersed Power Transformer (15kVA–31500kVA)?
The standard configuration is rated 15 kVA – 31500 kVA at 50 / 60 Hz. Other ratings in the same family can be built to order — tell us the load and we will confirm the nearest standard rating.
What voltage ratio is available?
The standard unit is 11 / 33 kV input to 400 / 415 V output. Voltage ratio, tapping range and vector group can be adjusted to your network; 50 Hz and 60 Hz designs are available.
Which standards and certifications apply?
The product is designed to IEC / GB. MARS operates an ISO 9001 / 14001 / 45001 certified factory and holds CE (ECM), UDEM, EAC and CQC approvals; every unit is routine-tested before dispatch and type or witnessed tests can be arranged.
Can this product be customised?
Capacity, voltage ratio, vector group, winding material (copper/aluminium), tap changer (off-load / on-load) and bushing configuration are customizable to project requirements.
What is the lead time and how is it shipped?
Packed in wooden case. Typical lead time is 25–45 days after drawing approval for distribution equipment and 60–90 days for power transformers and containerised systems. Shipment is by sea from Shanghai on EXW, FOB, CIF or DAP terms with a full document pack.
Enquire about this product
Tell us the rating, voltage ratio, frequency, quantity and destination. A MARS engineer replies with a technical proposal and quotation within one working day.
