Technical specifications
| Parameter | Value |
|---|---|
| Product Type | Three-Phase Oil-Immersed Power Transformer |
| Rated Capacity | 20 / 25 / 50 MVA |
| Input Voltage (HV) | 110 / 115 kV |
| Output Voltage (LV) | 11 / 23 kV |
| Frequency | 50 / 60 Hz |
| Phase | Three |
| Winding Material | Copper / Aluminium |
| Voltage Regulation | On-Load Tap Changer (OLTC) |
| Vector Group | Dyn11 / Yyn0 |
| Cooling | ONAN / ONAF (oil-immersed, radiator) |
| Standard | IEC / GB |
| Certification | CE, UL, ISO9001 |
| Service Life | 20 Years |
| Packing | Wooden Case |
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 sealed steel tank carries three sets of high-voltage porcelain bushings, a top-mounted conservator for oil expansion, side radiator banks for cooling and a control cabinet housing the OLTC and protection. The on-load tap changer maintains stable secondary voltage as demand varies, while the oil-immersed construction ensures efficient cooling and long, reliable substation service.
Typical applications
Utility and industrial substations, power transmission and distribution networks, renewable-energy step-up/step-down stations and large plants requiring regulated 110-kV-class transformation.
Customisation options
Capacity, HV/LV voltage, vector group, tap-changer type (OLTC/off-circuit), cooling class and fittings are customizable to project single-line requirements.
Ordering information
- Selling Unit: Single item
- Packing: Wooden Case
- Standards: IEC / GB; certified CE, UL, ISO9001
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 110–115 kV Three-Phase Oil-Immersed Power Transformer 20–50 MVA with OLTC?
The standard configuration is rated 20 / 25 / 50 MVA 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 110 / 115 kV input to 11 / 23 kV 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, HV/LV voltage, vector group, tap-changer type (OLTC/off-circuit), cooling class and fittings are customizable to project single-line 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.
