10MVA 33/11kV 33/6.6kV Power Transformer

Our company manufactures this three-phase oil-immersed power transformer using a new insulation structure that improves short-circuit resistance. The core is built from high-quality cold-rolled silicon steel sheet, and the high-voltage windings use high-purity oxygen-free copper wire in a multi-layered cylindrical structure. Every solid component is specially secured against loosening, ensuring the unit withstands long-term operation and transport stress without degradation.

The transformer delivers high efficiency and low loss, reducing power consumption and running cost while offering meaningful long-term operating savings. It is recognized as a promoted new-technology product within the industry.

Key Features

Unique Welding Process, No Leakage

The design eliminates high and low pressure risers to reduce the number of welds required. The fuel tank wall uses wide-width steel plates to minimize joints, and a unique welding process ensures consistent, high-quality seams throughout the tank structure.

Groove Structure for Reliable Sealing

All sealing flanges are grooved to maintain strong, long-term sealing performance across varying temperature and pressure conditions.

Controlled Leakage Points

All oil drain valves are made of copper, and the radiator uses a vacuum butterfly valve, both of which significantly reduce the risk of oil leakage over the transformer's service life.

Low Loss, Low Noise Operation

Built using advanced domestic and international technology and equipment through dedicated professional research and development, the core adopts high-performance cold-rolled grain-oriented silicon steel sheet processed on a fully automatic robotic lamination machine. This produces smaller shear burrs and a lower lamination coefficient, effectively reducing no-load loss, no-load current, and operating noise. No-load loss is typically 5% to 15% lower than transformers produced with manual lamination.

High Reliability Protection

The transformer is equipped with an oil surface thermometer, a pressure relief valve with contact point at the top of the fuel tank, and an oil level indicator with contact point on the oil storage cabinet. The high and low voltage bushings are anti-fouling enhanced pure porcelain oil-type bushings, suitable for heavy pollution level environments.

High-Quality Insulated Skeleton Support Inside the Coil

The coil interior is supported by a high-quality insulating skeleton, with all coils using both inner and outer struts. Every strut and block is chamfered for a uniform electric field and enhanced reliability. All fasteners on the coil's axial body use self-locking locknuts, allowing the product to withstand long-distance transport bumps without loosening and without requiring core lifting for inspection.

Professional Service

Pre-Sales Service

We provide design consulting in line with customer requirements, developing separate design schemes tailored to different customer markets to make the product more competitive in each application.

After-Sales Service

Our after-sales support covers the full lifecycle of the transformer, including the following commitments.

On-Site Installation and Commissioning

We provide on-site installation instructions, commissioning support, and after-sales service on a fee-for-service basis.

Free Lifelong Technical Advice

Customers receive free lifelong technical advice from our highly qualified engineers, offering confidence and peace of mind when purchasing from our company.

Guaranteed Spare Parts Supply

We guarantee the ongoing supply of spare and wearing parts at preferential prices, ensuring long-term operational continuity.

Dedicated Service Technician Team

Our highly qualified team of service technicians is well equipped to keep your transformer operating at high efficiency at all times.

The 10MVA 33/11kV 33/6.6kV power transformer combines a leak-resistant welded structure, low-loss and low-noise core design, robust insulation and mechanical support, and comprehensive protective fittings suitable for heavy pollution environments. Backed by full pre-sales design consultation and lifelong after-sales technical support, it is engineered to deliver reliable, efficient, and cost-effective performance for substation and industrial power applications.

33/11kv 33/6.6KV Power Transformer Specification