Reliable 25MVA Power Transformers Delivered for Overseas Industrial Applications

We recently completed the production and successful delivery of two sets of SFFZ-25000kVA 115/6.3/6.3kV oil-immersed power transformers for an overseas industrial power project. Manufactured with 100% copper windings and equipped with on-load tap changers (OLTC), these transformers were designed to provide stable voltage regulation, high operational reliability and long-term energy efficiency.

From engineering design and material procurement to factory testing and shipment, the entire project was completed within two months, demonstrating our strong manufacturing capacity and efficient project management for international customers.

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I. Project Background

As industrial facilities continue to expand worldwide, the demand for reliable medium and high-voltage power equipment continues to grow. Modern industrial plants require transformers capable of delivering stable power while minimizing energy losses and ensuring uninterrupted operation.

For this project, the customer required two 25MVA transformers with dual 6.3kV secondary windings to support multiple power distribution circuits. In addition to stable electrical performance, the project demanded a short production cycle, strict quality control and compliance with international manufacturing standards.

Our engineering team customized the transformer design according to the customer's technical specifications, ensuring dependable performance for continuous industrial operation.

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II. Product Highlights

High-capacity Power Distribution

With a rated capacity of 25MVA, the transformer provides efficient voltage transformation for medium and high-voltage industrial power systems, ensuring stable operation under continuous load conditions.

Dual 6.3kV Secondary Design

The customized dual low-voltage winding configuration allows flexible power distribution to multiple electrical systems while improving overall operational efficiency.

100% Copper Windings

High-purity copper conductors offer excellent electrical conductivity, strong short-circuit resistance and superior thermal performance. Combined with premium insulation materials, the transformer delivers long service life and dependable operation.

On-load Tap Changer (OLTC)

The integrated OLTC enables voltage adjustment without interrupting power supply, maintaining stable output voltage despite fluctuations in system load and improving overall grid reliability.

Low-loss Core Structure

The transformer utilizes high-quality grain-oriented silicon steel with an optimized magnetic circuit, effectively reducing no-load and load losses while improving energy efficiency throughout its operating life.

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III. Manufacturing & Quality Assurance

Every transformer is manufactured within our own production facilities, allowing full control over every stage of the manufacturing process—from core cutting and coil winding to vacuum drying, final assembly and factory testing.

Before shipment, both transformers successfully completed comprehensive routine tests, including winding resistance measurement, transformer ratio verification, insulation withstand testing, induced voltage testing, no-load and load loss testing, ensuring reliable electrical performance before delivery.

To protect the equipment during international transportation, each transformer was packed 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 these two SFFZ-25000kVA transformers demonstrates our capability to provide customized power transformer solutions for international industrial projects.

With reliable voltage regulation, energy-efficient performance and durable all-copper construction, the transformers will help improve power distribution stability, reduce long-term operating costs and support the continuous operation of industrial facilities.

Backed by extensive manufacturing experience and comprehensive export services, we continue to deliver high-quality transformer solutions for customers worldwide, providing customized engineering, efficient production, rigorous quality assurance and dependable technical support.