10KV Oil-Immersed Power Transformer (S11/S13 Series)

Oil-immersed power transformers are widely used in power transmission and distribution systems due to their excellent cooling performance and insulation reliability. By using transformer oil as both an insulating and cooling medium, these transformers can operate efficiently under high loads and harsh environments.
Designed for long-term operation, oil-filled transformers offer stable performance, high efficiency, and low maintenance requirements. They are suitable for applications such as substations, industrial plants, renewable energy systems, and infrastructure projects.

Rated Power:30-2500 kVA
Standard:IEC 60076 / ANSI C57

Voltage Level:10kV / 0.4kV
Efficiency:Up to 99%

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Core Value Proposition
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Better Overload & Heat Stability


Oil immersed power transformers allow heat to be dissipated through natural or forced oil circulation, avoiding local hot spots inside the winding.
This makes the transformer more stable under continuous high load or temporary overload conditions, especially in industrial power transformer systems.

Higher Insulation Margin in High Voltage Systems

Compared with dry type units, oil filled transformers provide a more uniform insulation medium around windings and core.
This improves dielectric strength and reduces partial discharge risk, which is critical for medium and high voltage power transformer applications.


Easier Maintenance & Fault Handlingment

Oil immersed transformers allow internal condition monitoring through oil analysis (such as moisture, gas content, etc.).
This helps users detect early faults and avoid unexpected shutdowns, improving reliability in industrial transformer operation.


More Suitable for Large Capacity Applications

Oil immersed power transformers are structurally more suitable for higher capacity and voltage levels compared to dry type transformers.
Widely used in substation transformers, mining equipment, and heavy-duty industrial transformer systems where capacity and durability are critical.

Technical Specifications
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No-load Loss(W)Load Loss(W)Impedance Voltage (%)
1001201140
1251351360
1601601665
2001901970
2502302300
3152702760
4003303250
5003853900
6304604460
8005605400
10006657415
12507808640
160094010440
2000108513180

Structure & Materials Construction
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Premium Material Selection

Core (Magnetic Circuit)
Our oil immersed power transformer uses high-permeability cold-rolled grain-oriented silicon steel (CRGO) to reduce core loss and no-load current.
Step-lap core construction minimizes flux leakage and improves efficiency in power transformer operation.

Windings (Conductors)
The windings of our oil filled transformer are made of 99.9% oxygen-free copper, ensuring low resistance and high electrical conductivity.
Advanced insulation structure enhances dielectric strength and thermal stability for industrial transformer applications.

Tank Structure
The tank of the oil immersed transformer is designed with corrugated steel panels and automatic welding technology to ensure a leak-proof structure.
This design increases heat dissipation efficiency, making it suitable for outdoor power transformer installations.

Insulation System
Our oil immersed power transformer uses IEC 60296 standard mineral oil combined with high-density insulation materials.
The fully sealed structure prevents moisture ingress and oxidation, ensuring long-term reliability in power transformer systems.

Detailed Technical Specifications
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Standard Unit (500kVA)

Length: 1450 mm
Width: 980 mm
Height: 1250 mm
Total Weight: 1480 kg
Oil Weight: 320 kg

Standard Unit (500kVA)

Length: 1450 mm
Width: 980 mm
Height: 1250 mm
Total Weight: 1480 kg
Oil Weight: 320 kg

Rigorous Testing & Quality Control

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Routine Tests (100% Tested for Each Power Transformer)


Winding Resistance Measurement
Voltage Ratio & Vector Group Verification
Short-Circuit Impedance & Load Loss Measurement
No-Load Loss & No-Load Current Measurement
Power Frequency Withstand Voltage Test
Induced Voltage Withstand Test (IVW)
Insulation Resistance & Polarization Index (PI)

Type Tests (Performed on Selected Units)

Temperature Rise Test
Verifies thermal performance and cooling capability under continuous full-load operation.
Lightning Impulse Test
Simulates overvoltage conditions to evaluate insulation strength under surge conditions in power transformer systems.



Special Tests (On Request)

Partial Discharge Measurement
Ensures no internal discharge activity under operating voltage, improving long-term reliability of the oil immersed power transformer.
Noise Level Measurement
Confirms compliance with environmental and acoustic standards.
Leakage & Pressure Test
Verifies tank sealing performance and structural integrity under pressure conditions.

Product Application Scenarios
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Frequently Asked Questions
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The S13 series represents an advanced evolution of the S11 design, featuring optimized iron core materials and enhanced structural design. S13 delivers significantly lower no-load losses (typically 15-20% reduction), higher energy efficiency ratings, and better compliance with modern green grid standards. Both series offer excellent reliability, but S13 is recommended for applications prioritizing maximum energy efficiency and lowest operating costs.

Yes, we provide full customization support for various voltage configurations including 11kV, 13.2kV, 20kV, 33kV, and other regional standards. Secondary voltages can also be customized (e.g., 0.4kV, 0.22kV, 0.48kV) to match your specific grid requirements. Our engineering team will work with you to ensure compatibility with your local utility standards and grid specifications.

We provide a standard 24-month warranty covering manufacturing defects and performance guarantees. Extended warranty options are available upon request. Additionally, we offer lifetime technical support, remote maintenance guidance, and on-site installation assistance for large-scale projects. Our customer support team is available 24/7 to address any technical questions or operational concerns.

Absolutely. Our transformers use premium mineral insulating oil that fully complies with IEC 60296 international standards. The oil provides excellent dielectric strength, superior thermal stability, and optimal arc suppression capabilities. We also offer alternative options including silicone oil and natural ester oil for specialized applications. All oils are sourced from certified suppliers and undergo rigorous quality testing.

Yes, we provide comprehensive installation support including detailed installation manuals, video tutorials, and technical documentation. For large-scale projects, we can arrange remote technical consultations or on-site installation supervision by our experienced engineers. We also offer commissioning support, performance testing, and operator training to ensure optimal transformer performance from day one.

Frequently Asked Questions
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Get Your Professional Quote Today

Our specialized engineering team is ready to provide you with a detailed technical proposal, competitive pricing, and customized solutions tailored to your specific requirements. We respond to all inquiries within 24 hours.

📍 Manufacturing Facility: Tai’an, Shandong Province, China
📧 Email: sales@dinghong-electric.com
💬 WhatsApp / WeChat: +86 13355383777
🌐 Website: www.dinghong-electric.com