Reliable Power Transformer Solution for Overseas Grid Infrastructure

We successfully completed the production, comprehensive factory testing and on-time delivery of one SFSZ-40000kVA 115/38.5/11kV oil-immersed power transformer for an overseas grid substation project. Designed with 100% copper windings and equipped with an on-load tap changer (OLTC), the transformer provides stable voltage regulation, high operational reliability and excellent energy efficiency for modern transmission and distribution networks.

From engineering design and raw material inspection to factory acceptance testing and shipment, every manufacturing stage was completed under strict quality control standards, ensuring dependable performance throughout the transformer's service life.

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I. Project Background

As electricity demand continues to increase worldwide, utilities are upgrading substations to improve transmission efficiency, strengthen grid stability and support future network expansion. Reliable power transformers are essential for maintaining stable voltage levels and ensuring uninterrupted electricity supply across industrial, commercial and residential users.

For this project, the customer required a 40MVA transformer capable of operating continuously under demanding grid conditions while providing flexible voltage regulation and long-term operational reliability. In addition to electrical performance, the project also required strict manufacturing quality, comprehensive testing and timely delivery.

Leveraging our extensive experience in customized transformer manufacturing, we developed a solution that fully meets the operational requirements of modern utility substations.

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II. Product Highlights

High-capacity Transmission Performance

Rated at 40MVA, the transformer efficiently converts high-voltage power for regional transmission and distribution systems, providing stable electrical performance under varying load conditions.

On-load Voltage Regulation

The integrated On-load Tap Changer (OLTC) allows voltage adjustment without interrupting power supply, helping maintain consistent output voltage and improving overall grid stability.

100% Copper Winding Structure

High-purity copper windings provide excellent electrical conductivity, superior short-circuit resistance and enhanced thermal performance. Combined with premium insulation materials, the transformer ensures reliable long-term operation with reduced maintenance requirements.

Low-loss Energy-efficient Design

An optimized magnetic circuit together with high-grade grain-oriented silicon steel significantly reduces both no-load and load losses, lowering operating costs while improving overall energy efficiency.

Built for Long-term Reliability

The oil-immersed cooling system provides efficient heat dissipation and stable insulation performance, allowing the transformer to operate safely in demanding utility environments for many years.

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III. Manufacturing & Quality Assurance

Every transformer is manufactured within our integrated production facilities, allowing complete control over every production stage, including silicon steel core processing, precision coil winding, vacuum drying, tank assembly and final testing.

Before shipment, the transformer successfully completed a comprehensive series of factory tests, including transformer ratio measurement, winding resistance testing, insulation withstand testing, induced voltage testing, no-load and load loss measurement and overall performance verification. These inspections ensure every transformer meets international quality requirements before leaving the factory.

To guarantee transportation safety during international shipment, the transformer was protected using reinforced export packaging with moisture-proof and vibration-resistant protection, ensuring safe delivery to the project site.

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IV. Project Value

The successful delivery of this SFSZ-40000kVA 115/38.5/11kV power transformer demonstrates our ability to provide customized transformer solutions for international transmission and distribution projects.

Featuring reliable voltage regulation, low operating losses and durable all-copper construction, the transformer will help improve substation efficiency, strengthen grid stability and reduce long-term operating costs.

With years of manufacturing experience and comprehensive export capabilities, we continue to support customers worldwide by providing high-quality power transformers, customized engineering solutions, efficient production and dependable after-sales technical support.