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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.
Core Verified Advantages
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.
Flexible Configuration Options
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.
Detailed Technical Specifications
Model Number
S11-750KVA
Rated Capacity
750 kVA
Phase
3 Phase
Primary Voltage
10kV (0.1kV-36kV customizable)
Secondary Voltage
440V (220V customizable)
Tap Range
±5% or +2×2.5%
Connection Symbol
Dyn11 / Yyn0
Frequency
50/60 Hz
Cooling Method
ONAN / KNAN
Winding Material
100% Oxygen-Free Copper / Aluminum (optional)
No-Load Loss
980 W
On-Load Loss
8750 W
No-Load Current
0.7%
Short-Circuit Impedance
6.5%
Insulation Class
Class A
Temperature Rise
65°C
Ambient Temperature
-25°C to +40°C
Standards Compliance
IEC 60076, GB 1094, CE, ISO 9001
Additional Capacity Options (S11 Series)
odel
Rated Capacity
(kVA)
Connection Symbol
Hight Voltage
(v)
Tap range
Low Voltage
(v)
No-load Loss
On-load Loss
No-load current
Short-circuit impedance
(W)
(W)
(%)
(%)
S11-50/35
50
Yyn0
or
Dyn11
35
±5%
+2×2.5%
0.4
160
1200
1.3
6.5
S11-100/35
100
230
2010
1.1
S11-125/35
125
270
2370
1.1
S11-200/35
200
340
3320
1
S11-250/35
250
400
3960
0.95
S11-500/35
500
680
6910
0.85
S11-630/35
630
830
7860
0.65
S11-1000/35
1000
1150
11500
0.65
S11-1250/35
1250
1400
13900
0.6
S11-2000/35
2000
1990
19700
0.55
S11-2500/35
2500
2360
23200
0.55
Core Engineering Advantages
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.
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.
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.
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.
Easy Installation & Maintenance: Compact and lightweight design reduces transportation and installation costs, while the sealed oil system minimizes maintenance requirements for long-term reliability.
Quality Assurance & Support
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.
Frequently Asked Questions
Q: What international standards does Leilang Electric's 750KVA oil-immersed transformer comply with?
A: Our S11-750KVA transformer is manufactured in strict accordance with IEC 60076 international standards and Chinese GB 1094 standards. It also holds CE and ISO 9001 certifications, ensuring compliance with global safety and performance requirements.
Q: Can I choose between copper and aluminum windings for this transformer?
A: Yes, we offer both 100% oxygen-free copper windings (for maximum performance and longevity) and high-grade aluminum windings (for cost-sensitive applications). Our engineering team can help you select the best option for your specific project.
Q: How much energy will the S11 low-loss design save compared to older transformers?
A: The S11 series reduces no-load losses by approximately 35% compared to traditional S9 series transformers. For a 750KVA transformer operating 24/7, this translates to over 2,600 kWh of annual energy savings, significantly lowering your electricity bills and carbon footprint.
Q: What makes this transformer resistant to short-circuit damage?
A: It features an advanced new insulating structure, multi-layer cylindrical high-voltage windings, and specially treated anti-loose fasteners. These design elements provide exceptional mechanical strength to withstand the high forces generated during short-circuit events.
Q: What customization options are available for this 750KVA transformer?
A: We provide comprehensive OEM/ODM services, including custom voltage ratings (0.1kV-36kV), tap ranges, connection symbols, cooling methods, enclosure colors, and branding. All custom designs are reviewed and approved by our certified engineering team before production.
Q: What quality control measures do you implement to ensure product reliability?
A: Each transformer undergoes 12+ quality checks throughout production, from raw material inspection to final performance testing. We test winding resistance, insulation resistance, core losses, impedance, and high-voltage withstand capability. All products are shipped with a detailed test report.
