Overview

The 8 MVA 33kV auto power transformer is a three-phase electrical device designed for voltage regulation and power distribution in medium-voltage networks. Unlike conventional two-winding transformers, the autotransformer utilizes a single integrated winding to transfer electrical energy, providing higher efficiency and reduced material consumption when input and output voltages share a common terminal.

This transformer is manufactured in accordance with international standards such as IEC 60076 and ANSI requirements. It is widely used in modern power infrastructure and medium-voltage distribution systems requiring stable and efficient voltage conversion.

Application Areas

Urban distribution networks use the 8 MVA 33kV autotransformer to step down 33kV grid voltage to 11kV, 6.6kV, or 0.4kV for residential and commercial power supply.

Industrial and mining operations rely on this transformer to supply heavy machinery and high-demand manufacturing equipment while maintaining stable performance under fluctuating loads.

Renewable energy projects such as solar and wind farms use the autotransformer for voltage matching between generation systems and utility grids.

Large-scale commercial infrastructure including airports, railway stations, and shopping complexes benefit from reliable power distribution and low-noise operation.

Key Advantages

High energy efficiency with low no-load loss and reduced load loss helps lower operational costs and improve system performance.

Compact design using shared winding technology reduces material usage and installation space requirements.

Fully sealed corrugated tank structure minimizes oil oxidation and extends service life while reducing maintenance needs.

Optional on-load tap changer enables voltage adjustment and supports grid fluctuation compensation.

Flexible configuration allows customization of voltage ratio, cooling method, and accessories according to project requirements.

Technical Specifications

Rated capacity typically ranges from 8 MVA to 20 MVA depending on application requirements.

Primary voltage options include 22kV, 33kV, 35kV, and 38kV.

Secondary voltage options include 11kV, 6.6kV, and 0.4kV.

Cooling method is ONAN oil natural air natural cooling.

Impedance approximately 8 percent.

Vector group options include Dyn11 or YNd11.

Core material uses high-grade CRGO silicon steel for low loss performance.

Winding material available in copper or aluminum.

No-load loss range from 7.0 kW to 7.87 kW.

Load loss at 75°C typically between 40.6 kW and 60 kW.

Frequency support for both 50Hz and 60Hz systems.

Protection accessories include pressure release valve and oil level gauge.

Design and Customization

The 8 MVA 33kV auto transformer can be customized for different voltage ratios, insulation levels, cooling methods, and protection accessories. Optional features such as OLTC, temperature monitoring, and remote communication systems can also be integrated to meet project-specific requirements.

Applications

This autotransformer is widely used in substations, industrial facilities, renewable energy plants, mining projects, commercial complexes, and utility distribution networks. Its compact design, high efficiency, and flexible configuration make it an ideal solution for medium-voltage power distribution systems.