EC Insulator Jiangxi Co., Ltd. is one of the most reliable manufacturers and suppliers of three phase oil immersed transformer in China. With abundant experience, we are committed to offering high quality custom service. Please feel free to wholesale premium three phase oil immersed transformer made in China here from our factory.
Short Overview for Listing Page
The three-phase oil-immersed transformer submerges core and three-phase windings in insulating oil. With insulating oil for insulation and cooling, voltage transformation is achieved through electromagnetic induction.
Main components include grain-oriented silicon steel core, windings, oil tank and insulating oil. Two versions are available: conventional type and hermetically sealed oil-filled type.
It features reliable heat dissipation, strong overload resistance, stable running performance and competitive cost. Commonly used in industrial power supply and urban & rural distribution networks. All units are designed and tested in line with IEC and GB relevant standards.
Product Details & Advantages
Executive Standards
Every three-phase oil-immersed transformer is developed, manufactured and inspected following domestic and international industry specifications.
International Standards
- IEC 60076: Series (Power transformers)
- IEC 60296: Mineral insulating oils used for electrical equipment
Chinese National Standards
- GB/T 1094 Series
- GB/T 6451
Core Construction
3.3 Integrated Clamping Frame
Heavy-duty integrated clamping frames are installed to fasten the core firmly. It prevents loose components and vibration under long continuous loads, securing stable magnetic circuits and reliable mechanical strength for long-term operation.
Transformer Working Principle
The working principle can be simply described as the cycle: electricity → magnetism → electricity.
When alternating voltage is applied to windings, alternating magnetic field will be generated. This process is known as excitation. The alternating magnetic field then induces alternating voltage on other windings, following the rule: electricity generates magnetism, and magnetism generates electricity.
High-voltage and low-voltage windings have no direct electrical connection. Energy transfer between them relies on magnetic fields.
Important reminder: A transformer cannot change power value. It only converts voltage and current, with power kept roughly constant. The voltage ratio between high-voltage and low-voltage (primary and secondary) windings equals their turns ratio.
Protection Configuration
4.1 Sealing & Anti-leakage Protection
Robust welded oil tanks are adopted for our three-phase oil-immersed transformers. Optimized sealing structure reduces the risk of oil leakage and supports long-term stable running.
4.2 Over-temperature Protection
Temperature monitoring units can be fitted to track oil temperature in real time. Alarms or trip signals will be triggered once overheating occurs, avoiding permanent damage to winding insulation.
4.3 Overload & Short-circuit Protection
Support matching external protection devices. These devices offer effective defense against overload and short-circuit faults, preventing equipment burnout.
4.4 Earthing Protection
Standard earthing terminals are reserved on the oil tank. Proper grounding eliminates risks caused by induced overvoltage and improves operation safety.
Standard Technical Parameters
5.1 Rated Capacity
We provide multiple standard rated capacities to satisfy different distribution demands. Custom capacity is acceptable upon request.
5.2 Rated Voltage
Various combinations of high voltage and low voltage can be configured, matching different grid voltage levels worldwide.
5.3 Loss & Energy Efficiency
Low-loss core and winding structure are adopted. Low no-load loss and load loss ensure outstanding energy-saving performance during continuous operation.
5.4 Insulation & Temperature Rise
Products comply with standard insulation grades. Under rated working conditions, temperature rise of windings and insulating oil can be controlled within the specified range.
5.5 Operating Conditions
Suitable for indoor and outdoor installation, adapting to normal temperature and humidity in power supply and distribution sites.
Product Advantages
Premium insulating oil serves as insulation and cooling medium. It enables even heat distribution and stable dielectric property, supporting safe and long-term service.
Equipped with low-loss grain-oriented silicon steel core plus optimized winding layout. No-load loss and load loss are well controlled to achieve good energy-saving effect.
Optimized core stacking and integrated fastening structure greatly reduce vibration and running noise. Performance remains consistent under long continuous loads.
Integrally welded oil tanks together with high-quality sealing parts deliver good moisture-proof, dust-proof and anti-corrosion capacity. Units can work steadily in indoor and outdoor tough environments.
Proven mature structure leads to low failure frequency. Daily maintenance work is simple; long service life brings excellent comprehensive economic benefits.
Quality Control
Raw Material Inspection
All raw materials including grain-oriented silicon steel, oxygen-free copper conductors, anti-corrosion steel plates and mineral insulating oil will go through strict inspection before production. We test magnetic permeability, copper resistance, insulation property of oil and welding quality of tanks to eliminate unqualified materials.
In-process Monitoring
Inspections are carried out throughout production stages: core stacking, winding wrapping, tank welding and oil filling. We strictly check sealing tightness and winding clamping strength, to avoid oil leakage, vibration and insulation failure during long-term outdoor use.
Comprehensive Finished Product Testing
Each transformer undergoes full tests: no-load loss, load loss, dielectric withstand voltage, winding DC resistance and oil tightness. Complete factory test reports can be provided for project acceptance.
Compliance with International Standards
All transformers conform to IEC 60076, GB/T 1094, GB/T 6451 and other mainstream power industry standards. Third-party type test certificates are available if customers require.
Flexible OEM & ODM Custom Service
Custom Electrical Parameters
Rated capacity, high/low voltage combination and connection group can be adjusted according to local grid standards, load requirements. Suitable for photovoltaic power stations, industrial parks, municipal power grids and mining projects.
Custom Structure & Appearance
Customers can choose hermetically sealed tank or conservator tank design. Anti-corrosion coating color, base size and lifting lugs can be modified to match installation conditions. Special versions for high-altitude areas and coastal salt-fog environments are available.
Drawing & Sample Support
2D layout drawings and technical datasheets can be offered for confirmation before formal orders. Small-batch prototype samples can be made for performance testing. Custom brand logos can be printed on oil tanks for bulk orders.
Custom Packaging Solution
Standard export fumigated wooden pallets are used for packaging. We can arrange reinforced shockproof packing, customized shipping marks and a full set of export documents as required.
Global One-stop After-sales Support
Fast Technical Support
Our sales team replies to inquiries promptly. Professional electrical engineers help select models and design customized power distribution solutions for your projects.
Long-term Warranty
All three-phase oil-immersed transformers come with standard factory warranty. Designed for over 20 years of stable outdoor operation. Extended warranty terms can be discussed for bulk orders and EPC projects.
Solutions for Quality Issues
We offer free replacement for manufacturing defects or damages occurring during transit. One-on-one remote guidance on installation, wiring and commissioning is provided for medium & large power projects.
Full Order Tracking
We keep clients updated on core assembly, winding production, factory testing and shipment schedules. Complete export documents including commercial invoice, packing list, certificate of origin and transformer test reports will be supplied fully.
Rich Overseas Project Experience
Our products are exported to South America, Southeast Asia, the Middle East and Africa. They are widely applied in power grids, substations, photovoltaic facilities and railway transmission projects.
Frequently Asked Questions
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