Converter Transformers

ConverterTransformers

Yonder converter duty transformers are suitable for complex power conversion systems. We offer transformers up to a rating of up to 25kVA in our range of turnkey solution for Hydrogen Generation 

We utilise the latest design, measurement, and testing tools to ensure each transformer meets and exceeds the latest industry standards, as well as operational and customer specifications. Our in-house capabilities include multi-secondary, star and extended-delta transformer design. Our converter transformers are manufactured after carefully performing seismic analysis and short circuit calculation. 

Specification

Yonder Offers

Input

6.6 kV, 11 kV, 22 kV, 33 kV

Connection

Primary, star, delta or extended delta connection

Output

2 – 27 secondary windings (up to 64 in exceptional requirements)

Vector group

-25 degrees to +25 degrees (5-degree variations)

Extended delta on LV windings create different angles

 

Voltage Pulses

Through use of different angles, different number of pulses can be achieved (12-48 pulses)

Type

Oil type

Dry type, VPI  (upto 10 MVA)

Cooling

Natural cooling (ONAN) or forced cooling (AF) or Oil-filled Transformers

Air cooling with directed air flow for Dry Type Transformers*

Efficiency

99% for large transformers

98% for transformers up to 1 kVA

Harmonics Control

Copper shield between HV and LV windings to contain harmonics to secondary load and not reflecting on primary

Winding Material

Copper foil as a conductor in LV winding or thinner conductor to keep Eddy current loss limited

Tap Changers

Off-circuit tap links can be provided on HV side

Converter Duty Transformers

Oil Cooled (ONAN) Transformers

Dry-Type (AN) Transformers

Converter transformers are specialized electrical devices that serve a dual purpose: they not only adjust voltage levels but also facilitate the conversion between alternating current (AC) and direct current (DC). This dual functionality makes them indispensable in various applications, including high-voltage direct current (HVDC) transmission systems, electric traction, and industrial processes like copper refining. By integrating both transformation and conversion capabilities, converter transformers ensure efficient and reliable power delivery across different sectors.
 
In HVDC transmission, converter transformers play a pivotal role. They connect AC power systems to DC transmission lines, enabling the long-distance transfer of electricity with minimal losses. These transformers are designed to handle high voltages and currents, often operating under challenging conditions with significant harmonic content. Their robust construction and advanced insulation systems ensure durability and performance in such demanding environments.
 
Beyond HVDC systems, converter transformers are integral to variable frequency drives (VFDs) used in industrial motor control. They provide the necessary voltage and frequency adjustments to match motor requirements, enhancing energy efficiency and process control. Additionally, in electric traction systems, such as those in railways, converter transformers supply the appropriate power to traction converters, ensuring smooth and efficient train operations.
 
From a design perspective, converter transformers are tailored to meet specific application needs. They often feature multiple windings and tap changers to accommodate varying voltage levels and load conditions. Advanced cooling systems, such as oil or air cooling, are employed to manage the heat generated during operation. Furthermore, the incorporation of high-quality materials and precise engineering practices ensures their reliability and longevity.
 
Understanding the significance of converter transformers is crucial for professionals in the energy and industrial sectors. Their ability to seamlessly integrate voltage transformation and current conversion functions makes them a cornerstone in modern electrical infrastructure. By ensuring efficient power flow and adaptability across various applications, converter transformers contribute significantly to the stability and advancement of our electrical systems.


High-Performance Converter Transformers for Industrial Excellence

Converter transformers play a pivotal role in high-voltage direct current (HVDC) systems, ensuring efficient power conversion and seamless energy transmission. At YonderH2, our transformers are engineered to meet the demanding requirements of modern industries, offering unmatched reliability, precision, and durability. Designed to handle high electrical stress and ensure optimal performance, these transformers are vital components in enabling renewable energy systems, long-distance power transmission, and large-scale industrial applications.

Advanced Technology for Sustainable Power Solutions

Our power converters and rectifier transformers utilize cutting-edge technology and superior materials to deliver exceptional performance, even under the most challenging conditions. YonderH2’s focus on innovation and sustainability ensures that our solutions are not only efficient but also environmentally friendly. Designed to meet modern energy demands, our systems incorporate advanced high-frequency components and robust insulation designs that minimize energy losses. These technologies also contribute to reducing the carbon footprint of power systems, making them a trusted choice for industries transitioning to greener energy solutions.

We implement multi-layer insulation systems, efficient core designs, and optimized winding configurations that help reduce eddy current losses and improve thermal performance. Moreover, our units are built to withstand harmonic distortion, voltage fluctuations, and load variability, ensuring a stable and consistent output even in fluctuating industrial environments.

Customized Solutions for Diverse Applications

At YonderH2, we understand that every project is unique, which is why we offer tailored power converter, IGBT rectifiers, HVDC  transformers, power transformers, and rectifier transformer solutions designed to meet your specific needs. From renewable energy projects to industrial applications requiring precise DC voltage regulation, our team of experts collaborates with you to design and deliver solutions that align with your operational goals. With YonderH2’s proven track record and commitment to quality, our systems are a dependable choice for enhancing energy efficiency and powering a sustainable future.

Our engineering teams bring decades of expertise to projects across diverse sectors such as chemical processing, steel manufacturing, data centers, mining, and offshore wind energy. We work closely with OEMs and system integrators to ensure full compatibility and integration with existing infrastructure, thereby reducing downtime and maximizing return on investment.

Ensuring Safety, Efficiency, and Longevity

Safety and durability are cornerstones of YonderH2’s product design philosophy. Our converter transformers undergo rigorous type testing, including short-circuit withstand tests, temperature rise analysis, impulse voltage testing, and partial discharge assessments to guarantee compliance with international standards such as IEC, ANSI, and IEEE. We use oil-immersed and dry-type designs depending on the application, with advanced cooling systems that support continuous operation under heavy electrical load.

In addition to high-efficiency conversion capabilities, our transformers offer enhanced fault tolerance and overload protection, ensuring system stability during abnormal events. Remote monitoring and diagnostics features allow for real-time health assessment, enabling predictive maintenance and minimizing unplanned outages.

Partnering for a Sustainable Energy Future

YonderH2 remains committed to driving the transformation of industrial and energy landscapes through high-performance transformers. As the global demand for reliable and sustainable power infrastructure grows, we continue to invest in R&D to deliver smarter, cleaner, and more resilient solutions.

Whether you’re upgrading aging infrastructure, expanding capacity, or developing greenfield projects, our advanced converter transformers provide the foundation for high-efficiency, low-loss, and future-proof energy systems. Partner with YonderH2 and power your progress with confidence.

Frequently Asked Questions

What are the key features of Yonderh2's Converter Transformers?

Yonderh2’s converter transformers are designed for complex power conversion systems, offering:

  • High Efficiency: Achieving up to 99% efficiency for large transformers.​
  • Multiple Configurations: Available in oil-cooled (ONAN) and dry-type (AN) variants.​
  • Customizable Outputs: Providing 2 to 27 secondary windings, with up to 64 for exceptional requirements.​
  • Harmonics Control: Incorporating copper shields between HV and LV windings to contain harmonics to the secondary load.​
How do Yonderh2's Converter Transformers support multi-pulse systems?

By utilizing different vector group angles and extended delta connections on LV windings, Yonderh2’s transformers can achieve various pulse configurations, including 12, 24, and 48 pulses, enhancing power quality and reducing harmonics.

What cooling methods are available for these transformers?

Yonderh2 offers:

  • Oil-Cooled (ONAN) Transformers: Natural or forced oil cooling.​
  • Dry-Type (AN) Transformers: Air cooling with directed airflow.​
Are Yonderh2's Converter Transformers customizable for specific applications?

Yes, Yonderh2 provides tailored solutions, including customizable input voltages (6.6 kV to 33 kV), primary connections (star, delta, or extended delta), and secondary windings, to meet diverse project requirements.

What standards do Yonderh2's Converter Transformers comply with?

These transformers are designed and tested to internationally recognized standards, including IEC, IEEE, UL, and CE, ensuring global compliance and reliability.

How does Yonderh2 ensure the reliability of its Converter Transformers?

Yonderh2 utilizes advanced design, measurement, and testing tools, including seismic analysis and short circuit calculations, to ensure each transformer meets and exceeds industry standards and customer specifications.

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Yonder DC Power Supplies are designed and manufactured for MW-scale hydrogen production.

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