Multi-Capacity Multi-Voltage 10/11.2/12.5/14 MVA Oil Immersed Substation Power Transformer 12470V to 2400D 4160Y/2400V ONAN/ONAF ANSI/IEEE Standards
The S-10000/12.47/4.16&2.4&2.4 is a three phase outdoor substation power transformer with a 10/11.2/12.5/14 MVA ONAN/ONAF rating. It is configured for 12470V Delta primary input and multiple medium-voltage secondary outputs, including 2400V Delta, 2400Y/1385V Wye and 4160Y/2400V Wye, making it suitable for utility distribution substations, industrial plants, pump stations, renewable project substations and large outdoor distribution networks that require both 2.4kV and 4.16kV power levels.
Built with mineral oil insulation, aluminum windings, silicon steel core, side-mounted ATC terminal chambers, porcelain bushings and a 7-position off-load tap range from 14400V to 11500V, the transformer helps match site voltage conditions while maintaining medium-voltage distribution flexibility. The ANSI C57.12.00 design, HV BIL 110kV, LV BIL 60kV and 55/65/55F/65F°C temperature rise support outdoor substation operation where insulation coordination, voltage adjustment and load-stage flexibility are important.
Product photos
Main Data
| Item |
Data |
| Product type |
Three phase outdoor substation power transformer |
| Rated capacity |
10/11.2/12.5/14 MVA |
| Phase |
3 Phase |
| Primary voltage |
12470V Delta |
| Secondary voltage |
2400V Delta; 2400Y/1385V; 4160Y/2400V |
| Frequency |
60Hz |
| Vector group |
Dd0y1y1 |
| HV BIL / LV BIL |
110kV / 60kV |
| Cooling method |
ONAN/ONAF |
| Winding material |
Aluminum |
| Temperature rise |
55/65/55F/65F°C |
| No-load loss |
8301W |
| Load loss |
64154W at 85°C |
| No-load current |
0.16% |
| Impedance |
6.90% |
| Dimensions |
162 × 102 × 120 in |
| Weight |
54961 lbs |
Product Advantages
- Multi-Capacity ONAN/ONAF Cooling Structure
Rated at 10/11.2/12.5/14 MVA, this transformer uses radiator banks and cooling fan assemblies to support ONAN/ONAF operation. It helps customers cover normal load and fan-assisted peak demand with one unit, reducing the need for immediate transformer replacement when load requirements increase.

- Multi-Voltage Secondary Design
Configured with 12470V primary input and 2400D, 2400Y/1385V and 4160Y/2400V secondary outputs, the transformer helps customers match different medium-voltage distribution requirements with one flexible design.
- Side-Mounted HV and LV ATC Terminal Chambers
Side-mounted HV and LV ATC chambers provide accessible cable termination space for outdoor substation layouts, helping customers simplify field wiring, inspection and maintenance.

Technical drawings

Standard Features
- Pressure / Vacuum Gauge
Shows internal tank pressure for safe operation monitoring.
- Pressure Relief Valve
Releases excess internal pressure to protect the transformer tank.
- Radiator Butterfly Valve
Isolates the radiator oil circuit during maintenance.
- Nameplate
Displays ratings, wiring data, standard and identification information.
- Under-Oil Arrester Isolation Switch
Isolates the HV arrester circuit for inspection or maintenance.
- Temperature Controller
Monitors temperature and controls alarms, trips or cooling fans.
- HV ATC Terminal Chamber
Houses HV bushings and cable termination components.
- Oil Filling Port
Used for oil filling, filtering or maintenance.
- Cooling Fan Assemblies
Force air through the radiator to support ONAF cooling.
- Oil Level Indicator
Displays transformer oil level inside the tank.
- Oil Temperature Gauge
Displays transformer oil temperature.
- Off-Circuit Tap Changer
Adjusts winding taps to match site voltage conditions.
- Control Terminal Box
Houses control wiring and accessory terminals.

Applications
-
Utility Distribution Substations
Suitable for 12.47kV feeder substations, municipal distribution points and outdoor medium-voltage networks requiring 2.4kV or 4.16kV secondary power.
-
Industrial Facilities
Suitable for large plants, processing facilities, pump stations and heavy electrical rooms requiring stable medium-voltage power distribution.
-
Renewable Energy Project Substations
Suitable for solar, wind and energy storage site distribution substations requiring outdoor transformer solutions for collection, auxiliary power or medium-voltage distribution systems.
-
Commercial and Infrastructure Power Systems
Suitable for campuses, water treatment facilities, transport infrastructure and large outdoor power supply points requiring centralized medium-voltage power distribution.
-
Replacement and Retrofit Projects
Suitable for existing outdoor substations requiring transformer replacement with 12.47kV primary input and 2.4kV / 4.16kV secondary output compatibility.

Factory Test Report

Substation Transformer Specification
| Rated Capacity (kVA) |
High Voltage (kV) |
Low Voltage (V) |
Connection Symbol |
Short Circuit Impedance (%) |
No-load Loss (W) |
On-load Loss (W) |
Dimension W×H×D (mm) |
Weight (kg) |
| 800 |
4.16 / 12.47 / 13.2 / 13.8 / 24.94 / 34.5 or others |
208/120 / 480/277 / 600 / 12470 / 13200 / 13800 or others |
Dyn1 / Ynyn0 / Dyn11 / Dd0 / Ynd11 or others |
2.7 / 3.1 / 4.35 / 5.75 / 6.0 |
980 |
9,350 |
1060×1500×1780 |
2,050 |
| 1000 |
1,160 |
11,500 |
1085×1570×1800 |
2,450 |
| 1250 |
1,380 |
13,900 |
1160×1610×1890 |
2,900 |
| 1600 |
1,660 |
16,600 |
1190×1630×1950 |
3,400 |
| 2000 |
2,030 |
18,300 |
1260×1700×2090 |
4,100 |
| 2500 |
2,450 |
19,600 |
1150×2150×2250 |
4,750 |
| 3000 |
3,240 |
26,500 |
1900×2600×2150 |
6,500 |
| 5000 |
4,500 |
27,000 |
2500×2210×3180 |
9,500 |
| 7500 |
7,200 |
32,000 |
3660×3100×5100 |
13,600 |
| 10000 |
8,500 |
35,500 |
3830×2640×2216 |
15,800 |
Why Choose Us
1. With extensive experience in North American projects, Winley Electric designs substation transformers to meet applicable ANSI/IEEE, CSA, NEMA and related standard requirements.
2. With a stable supply chain, mature production processes, Winley Electric can deliver substation power transformers within 12 weeks after technical confirmation.
3. Winley Electric provides complete English technical documentation, 24/7 technical response, spare parts support, and a 2-year warranty to support project installation and long-term operation.