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Power Transformers (60–500kV, up to 1200MVA)

Custom-Engineered High Voltage Transformers for Power Transmission & Generation

Power transformers are the cornerstone of modern electrical grids, playing a critical role in efficiently transmitting and distributing electricity from generation plants to substations and large industrial consumers. Our high voltage transformers are custom-engineered to meet the most demanding specifications, ensuring reliability, efficiency, and a long service life for your vital infrastructure.

Whether you need a Generator Step-Up (GSU) transformer to boost voltage at a power plant or a high-capacity unit for a major substation, we provide robust, high-performance solutions designed to the highest international standards. We invite you to learn more and Request a Quote or Talk to an Engineer today.

What Are Power Transformers?

A power transformer is a type of electrical transformer used in power transmission and distribution systems to step up or step down voltage levels. Unlike distribution transformers, which typically operate at lower voltages and serve end-users, power transformers handle extremely high voltages and large power capacities, making them essential for long-distance electricity transport.

They are typically found in:

• Power generation stations where they step up the voltage from the generator to the transmission level.

• Transmission substations where they interconnect different voltage levels in the power grid.

• Major industrial facilities that require large amounts of power.

By efficiently converting voltage, these transformers minimize energy loss over long distances, making them indispensable for a stable and effective power grid.

Voltage & Capacity Range We Cover

We specialize in designing and manufacturing large power transformers with a wide range of voltages and capacities to fit diverse project requirements.

Our extensive experience covers a broad spectrum of voltage classes, including but not limited to:

• 66kV, 69kV: Commonly used in regional sub-transmission systems and industrial applications.

• 110kV, 115kV, 132kV: Standard voltage levels for high-voltage transmission networks globally, including those used in Europe and parts of Asia.

• 220kV, 230kV: High-capacity transformers for national power grids, ensuring efficient bulk power transfer.

• 330kV, 400kV: Crucial for major transmission backbones, facilitating power exchange between large regions.

• 500kV: Ultra-high voltage transformers for long-distance, high-capacity power transmission projects.

We offer capacities up to 1200 MVA, with common configurations including 60 MVA, 120 MVA, 500 MVA, 800 MVA, and 1200 MVA power transformer units. Each transformer is meticulously designed to your specific needs, including custom voltage ratios and configurations for both single and three-phase transformer applications.

Types of Power Transformers Available

We offer a comprehensive portfolio of power transformers, each designed for a specific function within the electrical grid.

• Oil-Immersed Power Transformers: The most common type for high-voltage applications. These transformers use mineral oil for both insulation and cooling, making them highly efficient and reliable.

• Generator Step-Up (GSU) Transformers: These are critical for power plants, stepping up the low voltage from the generator to the high voltage required for transmission.

• Auto Transformers: Used in transmission systems to interconnect two different voltage levels where the ratio between the voltages is close. They are typically more compact and efficient than two-winding transformers.

• HVDC Converter Transformers: Specialized transformers used in High-Voltage Direct Current (HVDC) transmission systems to connect AC grids with DC lines.

• Custom Engineered Transformers: Our core competency is creating bespoke transformer solutions for unique or challenging projects.

Applications & Use Cases

Our high voltage transformers are built for the backbone of global energy infrastructure.

• National Transmission Grids: We supply utility-grade power grid transformers that ensure the stable and secure transmission of electricity across entire countries.

• Power Generation Plants: Our transformers are used in conventional power plants (thermal, hydro) as well as renewable energy projects (wind farms, solar plants).

• Industrial Users: We provide transformers for energy-intensive industries such as steel mills, petrochemical facilities, and data centers.

• International Energy Projects: We are a trusted transformer supplier for large-scale EPC (Engineering, Procurement, and Construction) projects around the world.

Technical Features & Customization

We adhere to the highest technical standards to deliver transformers that are both high-performing and highly adaptable.

• Cooling Systems: We offer various cooling methods, including ONAN (Oil Natural Air Natural), ONAF (Oil Natural Air Forced), and OFAF (Oil Forced Air Forced), to optimize heat dissipation based on load and environment.

• Tap Changers: Transformers can be equipped with either On-Load Tap Changer (OLTC) for continuous voltage regulation under load or De-Energized Tap Changer (DETC) for offline adjustments.

• Loss Class & Efficiency: Our transformers are designed to meet stringent efficiency standards, including IEC 60076 and IEEE C57, resulting in low loss transformers that reduce operational costs.

• Optional Accessories: We offer a range of smart accessories, such as online monitoring systems, bushing monitors, and gas relays, to enhance reliability and enable predictive maintenance.

Manufacturing & Testing Capabilities

Our commitment to quality is backed by a state-of-the-art manufacturing facility and rigorous testing procedures.

• Factory: Our modern transformer factory is equipped with advanced production machinery and staffed by a team of experienced engineers and technicians.

• Testing: Every transformer undergoes a full suite of routine tests. We also offer type tests and special tests as required.

• Certifications: We are an ISO certified transformer manufacturer (ISO 9001, ISO 14001, ISO 45001), ensuring quality management, environmental responsibility, and occupational health and safety.

• Third-Party Inspection: We support third-party inspections and FAT tested transformers (Factory Acceptance Test) with accredited agencies like SGS and Bureau Veritas to provide complete peace of mind.

Export Markets & Compliance

We have a proven track record of exporting our transformers to major markets worldwide, including North America, Europe, the Middle East, and Africa. We ensure our products comply with the specific technical standards and grid requirements of each region.

• Standards: Our transformers can be designed to comply with international standards such as IEC, IEEE, ANSI, CSA, and GOST.

• Certifications: We can provide CE, RoHS, and other necessary certifications to ensure seamless integration into international grids.

FAQs – Power Transformers (60–500kV)

What is the difference between a GSU and a two-winding transformer? A GSU is a specific type of two-winding transformer used to step up voltage at a power generation station. While all GSUs are two-winding transformers, not all two-winding transformers are GSUs.

How long is the typical lead time? Lead times vary depending on the transformer's size, complexity, and current production schedules. Please contact our sales team for an accurate estimate for your specific project.

Do you offer installation or on-site services? We primarily focus on manufacturing and testing, but we can provide supervision and support for installation and commissioning upon request.

What information is needed to request a quote? To get a fast and accurate quote, please provide the required power capacity (MVA), voltage levels (primary/secondary), vector group, tap range, and any specific technical standards or accessory requirements.

Can I request FAT or third-party testing? Yes, we welcome and facilitate both FAT (Factory Acceptance Testing) and third-party inspections to ensure full compliance with your specifications.

Looking for a custom high voltage transformer?

Our engineering team is ready to help you find the perfect solution for your next project. We combine deep technical expertise with world-class manufacturing to deliver reliable and efficient power transformers.

Get a fast quote now or reach out to us via the contact details below to start a conversation.