Technical Parameters & Ratings
IEC / ANSI CertifiedFactory Standard
| Rated Capacity | 250 kVA |
|---|---|
| Primary Voltage (U1) | 33,000 V (33 kV) |
| Secondary Voltage (U2) | 415 V / 240 V (3-Phase 4-Wire) |
| Vector Group | Dyn11 |
| Rated Frequency | 50 Hz |
| Cooling Method | ONAN (Oil Natural Air Natural) |
| Primary Current (I1) | 4.37 A |
| Secondary Current (I2) | 347.8 A |
| Guaranteed No-Load Loss (P0) | 400 W |
| Guaranteed Load Loss (Pk at 75°C) | 2750 W |
| Short-Circuit Impedance (Uk) | 4.0% |
| HV Insulation Level | LI 170 / AC 70 (33kV Class) |
| Temperature Rise Limits | Top Oil ≤ 50K, Winding ≤ 55K (45°C Ambient) |
| Creepage Distance | ≥ 31 mm/kV (Outdoor Tropicalized Porcelain) |
| Core & Coil Weight | 560 kg |
| Insulating Oil Weight | 370 kg |
| Total Assembled Weight | 1120 kg |
| Overall Footprint (L×W×H) | 1200 mm × 820 mm × 1380 mm |
| Governing Standards | IEC 60076, BS 171, SON NIS, NERC Code |
Application Scenarios
- Rural utility distribution network feeders
- Industrial and mining site power supply
- Infrastructure and EPC contractor projects in Africa and MENA
- Renewable energy grid connection at voltage class
Key Features
- 250 kVA rated capacity for rural utility and distribution network applications
- class design suited for Africa, MENA, and IEC-standard grid markets
- Oil-immersed ONAN structure for stable thermal performance in outdoor environments
- Copper or aluminum winding options available to suit project budget requirements
- Off-circuit tap changer with +/-2 x 2.5% or +/-5% range as standard
Frequently Asked Questions
What is an oil-immersed distribution transformer used for?
It steps down the network voltage to the level required by end users in utility, industrial and commercial distribution networks.
Which voltage classes does this range cover?
The range covers common distribution voltage classes with ratings sized to the load requirement of your network or project.
What cooling and insulation system is used?
The unit uses oil-immersed cooling with sealed or conservator tank design according to rating and site conditions, providing stable thermal performance.
Can the transformer be customized for my grid?
Yes. Voltage ratio, vector group, impedance, tap range and accessory package are all configurable to your specification.
Are routine tests performed before shipment?
Yes. Every unit is routine-tested before shipment and supplied with test reports for the project file.
