Leilang Electric, an ISO 9001 certified global manufacturer of industrial power distribution equipment with 15+ years of specialized transformer engineering experience, presents our S11-750KVA 3-phase outdoor oil-immersed distribution transformer. This high-performance unit delivers reliable power conversion from 10kV primary to 440V secondary voltage, supporting both 50Hz and 60Hz frequency systems for industrial, mining, and petrochemical applications worldwide.

• S11 Ultra-Low Loss Technology: Built with high-grade cold-rolled silicon steel cores to minimize energy waste, achieving industry-leading no-load and on-load loss performance that reduces operational costs by up to 35% over older transformer generations.
• Enhanced Anti-Short Circuit Design: Features a new insulating structure, multi-layer cylindrical high-voltage windings, and specially treated anti-loose fasteners to withstand extreme electrical stresses and ensure long-term system stability.
• Dual International Standard Compliance: Manufactured in strict accordance with IEC 60076 and GB 1094 standards, with additional CE and ISO certifications, guaranteeing global safety and performance compatibility.

We offer both 100% oxygen-free copper and high-grade aluminum winding options to meet your budget and performance requirements. The transformer supports standard connection symbols Dyn11/Yyn0 and cooling methods ONAN/KNAN, with customizable voltage ratings from 0.1kV to 36kV for specialized project needs.

1. Industry-Leading Energy Efficiency: The S11 series uses high-quality cold-rolled silicon steel cores with precision lamination to reduce core losses, delivering significant energy savings over the transformer's 30+ year service life.
2. Superior Short-Circuit Resistance: Our proprietary insulating structure and multi-layer cylindrical winding design provide exceptional mechanical strength, while all fasteners undergo special anti-loose treatment to prevent damage during fault conditions.
3. Premium Material Construction: Selected oxygen-free copper wire ensures high conductivity and thermal stability, while the robust steel enclosure provides excellent protection against harsh outdoor environments.
4. Low Noise & Low Partial Discharge: Advanced manufacturing processes result in quiet operation (<60 dBA) and minimal partial discharge, making this transformer suitable for noise-sensitive industrial and commercial areas.
5. Easy Installation & Maintenance: Compact and lightweight design reduces transportation and installation costs, while the sealed oil system minimizes maintenance requirements for long-term reliability.

All Leilang Electric transformers undergo a rigorous 12-step quality control process certified to ISO 9001 standards:

• Raw material inspection and material certification verification
• Winding resistance and insulation resistance testing
• Core loss and excitation current measurement
• Short-circuit impedance and voltage ratio testing
• High-voltage withstand and partial discharge testing
• Final comprehensive performance verification and oil quality analysis

We support sample orders for quality verification and offer full OEM/ODM customization services, including custom voltage ratings, tap ranges, enclosure colors, and branding. With a monthly production capacity of 1,000 units and a standard lead time of 15-25 days, we can meet both small-scale and large project requirements. All products come with a 24-month warranty from the bill of lading date and lifetime technical support from our team of certified electrical engineers.