Three-phase power transformer
The three-phase oil-filled power transformer is designed using advanced core and winding technology, providing outstanding energy-saving performance and extremely low power losses.
The transformer, equipped with a reliable insulation oil cooling system (ONAN/ONAF), provides excellent temperature control and high overload resistance. The one-piece sealed design of the corrugated tank prevents oil from aging, significantly increasing its service life to 30 years.
Featuring high mechanical strength, excellent insulation characteristics, and high resistance to short circuits, it operates stably and with low noise levels. It is easy to install and maintain, and has a competitive overall cost. To meet various needs in the industrial and energy sectors, options for voltage, power, vector group, and tap changer are available.
Product Overview
The three-phase oil-immersed power transformer is a three-phase distribution and power transformer with insulating cooling oil. It features a high-quality silicon steel core and pure copper winding, as well as a fully sealed corrugated tank design. Widely used in 10 kV/35 kV electrical networks, industrial enterprises, commercial complexes, solar and wind power plants, mining industry, and rural power distribution systems for voltage conversion and power transmission.
Main structural features
High-permeability cold-rolled silicon steel core, low magnetostrictivity, reduced no-load losses and no-load current.
Winding made of high-purity oxygen-free copper, tightly wound, has high mechanical strength and high resistance to short circuits.
A completely sealed corrugated radiator tank, which does not require an expansion tank, effectively isolates air and moisture, preventing insulation aging.
High-performance insulating oil, which performs dual functions of insulation and heat dissipation.
Standard Dyn11 vector group, low harmonic distortion, stable output voltage.
Optional branch switch for voltage regulation according to operating conditions.
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Main advantages of the product
Ultra-low energy loss: optimized core and winding design, low idle and load losses, with a clear long-term energy-saving effect.
Excellent heat dissipation and overload protection: Natural oil cooling of ONAN, good heat dissipation effect, stable operation under short-term overload conditions.
High safety and reliability: high insulation, arc suppression, waterproof, moisture-proof and dust-proof, adaptable to harsh outdoor operating conditions.
Low noise during operation: Advanced cutting and core assembly processes effectively reduce noise during operation, meeting the requirements of urban environments.
Long service life: Fully sealed design prevents oil oxidation and moisture ingress, with a service life of up to 30 years under normal operation.
Low maintenance costs: no regular oil changes or scheduled maintenance are required, which saves on subsequent operating expenses.
Cost-effectiveness: compact design, reasonable price, lower overall investment compared to dry-type transformers.
Technical Parameter Range
Nominal voltage: 10 kV, 35 kV (upon request)
Rated power: 50 kVA–2500 kVA, customizable for larger capacities
Cooling method: ONAN / ONAF
Vector group: Dyn11, Yyn0 (optional)
Frequency: 50 Hz / 60 Hz (upon request)
Insulation level: Complies with IEC and GB standards
Scope of application
Distribution of electricity in cities and rural areas, power supply for industrial enterprises, shopping centers and residential complexes, photovoltaic and wind energy projects, power supply for mines, railways and highways.
Customer service
We can manufacture products with specified voltage, power, pin positions, cooling method, protective device, and dimensions according to the customer's drawings and requirements for operating conditions.
