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Factory Price S11 250kVA 10kV to 0.4kV Distribution Power Transformer for Rural Electrification
Product Overview
The Factory Price S11-250kVA 10kV to 0.4kV Distribution Power Transformer is a high-performance, three-phase oil-immersed unit specifically engineered for rural electrification and agricultural power grids. As an industry-standard step-down transformer, the S11 series balances cost-efficiency with exceptional reliability. Whether for remote village power supply, irrigation systems, or small industrial zones, this 250kVA unit provides a stable 400V/415V output to ensure the longevity of downstream electrical equipment.
Key Selling Points
Cost-Effective Energy Savings: The S11 core design significantly reduces no-load losses compared to S9 models, providing a high ROI for long-term rural infrastructure.
Ruggedized for Rural Environments: Designed for pole-mounted or ground-mounted installation, featuring high-durability anti-corrosion coating for outdoor use.
International Standards Compliance: Fully compliant with IEC 60076, CE, and ISO standards, ensuring seamless integration into global tenders and EPC projects.
Detailed Technical Specifications
Core Material: Built with high-permeability, cold-rolled grain-oriented (CRGO) silicon steel sheets for reduced magnetic hysteresis.
Cooling System: Natural Oil Natural Air (ONAN) cooling with high-efficiency corrugated radiator fins for optimal heat dissipation.
Insulation Class: Class A insulation with high-dielectric strength mineral oil to prevent internal arcing.
Tapping Range: Equipped with an off-circuit tap changer (e.g., ±5% or ±2x2.5%) to adjust to fluctuating input voltages from the grid.
Sealing Technology: Vacuum-filled oil process ensures zero air bubbles, enhancing the aging resistance of the insulating oil.
Dust & Leakage Protection (Targeting Africa)
Core Strengths: In sandy and dusty regions (like many African countries), dust accumulation on seals combined with high temperatures often leads to oil leakage and insulating oil degradation, causing premature transformer failure.
Our Solution:
Double-Gasket Hermetic Sealing: We use high-quality nitrile rubber gaskets and a fully sealed tank design to isolate oil from external dust and moisture.
Enhanced Surface Treatment: A multi-layer, electrostatic powder coating prevents sand abrasion and UV-induced paint peeling.
Leak-Proof Bushings: High-creepage distance porcelain bushings with reinforced sealing collars prevent sand from penetrating the connection points, drastically reducing maintenance frequency.
FAQ for Distributors & EPC Companies
Q1: Can the voltage ratio be customized for specific African grid standards (e.g., 11kV or 33kV)?
A: Yes. While 10kV is standard, we specialize in customizing primary voltages to 6kV, 11kV, 15kV, 20kV, or 33kV to meet local utility requirements.
Q2: Do you provide Type Test Reports for government tender submissions?
A: Certainly. We provide comprehensive routine and type test reports (including temperature rise and impulse tests) to support your bidding process.
Q3: How do you handle after-sales support in remote regions?
A: We offer a 24-month warranty and provide a complete set of spare parts (bushings, gaskets, oil level gauges). Our engineers provide remote technical guidance 24/7.
Q4: Is the transformer suitable for renewable energy (Solar/PV) step-up applications?
A: Yes, we can modify the internal structure and vector group (e.g., Dyn11) to optimize performance for PV grid-tie systems.
Q5: What is the estimated service life of this unit in tropical climates?
A: With proper maintenance, our S11 units are designed for a service life of over 25-30 years, even in high-ambient temperature regions.
Contact our engineering team today for a customized quote and technical data sheet!
