Why Phase-Shift Transformers Are the Secret Weapon in High-Power DC Conversion

10-29 2025 | By:

High-power DC conversion is critical in industries such as electrolysis, steel manufacturing, renewable energy rectification, and EV charging infrastructure. One of the biggest challenges is managing harmonics, voltage ripple, and equipment thermal stress. Phase-shift transformers, particularly the ZT(P)SFG(H) series from ZTelec Yuguang, have proven to be a secret weapon for industrial operators looking to improve DC conversion efficiency, system reliability, and equipment lifespan.

What Makes Phase-Shift Transformers Essential in DC Conversion

In DC conversion systems, AC is converted to DC using multi-pulse rectifiers (6-pulse, 12-pulse, 24-pulse). Without proper phase management, harmonic currents and voltage distortion increase, causing:

• Transformer and rectifier overheating

• High Total Harmonic Distortion (THD)

• Voltage instability

• Shortened equipment life

Phase-shift transformers mitigate these issues by introducing a controlled phase angle between windings, effectively canceling selected harmonic orders.

ZT(P)SFG(H) Series Technical Specifications

ZTelec Yuguang’s ZT(P)SFG(H) series offers advanced specifications suitable for a wide range of high-power DC applications:

Note: The above are common specifications, and we accept customization up to 38kv/12000kva

ZT(P)SFG(H) series Phase-Shift Rectifier Transformer–ZTELEC

Key Advantages of the ZT(P)SFG(H) Series:

• High THD reduction (85–95%)

• Multi-pulse configuration compatibility (6/12/24-pulse)

• Reliable insulation and thermal stability

• Customizable voltage ratios, phase shifts, and cooling types

Applications in High-Power DC Conversion

1. Electrolysis Plants

   • Aluminum, copper, or zinc electrolysis requires large DC currents with minimal voltage ripple.

   • Phase-shift transformers stabilize rectifier input and improve overall system efficiency.

2. Steel & Metal Processing

   • DC drive systems for rolling mills and furnaces benefit from harmonic reduction and enhanced equipment lifespan.

3. EV Charging Stations

   • High-power DC fast chargers require multi-pulse rectifier systems.

   • ZT(P)SFG(H) transformers provide clean DC output and reduce grid harmonics.

4. Renewable Energy DC Rectification

   • Photovoltaic and wind energy systems often use inverters to feed DC power into the grid.

   • Phase-shift transformers minimize harmonics and voltage fluctuations, improving reliability.

ZT(P)SFG(H) series Phase-Shift Rectifier Transformer–ZTELEC

Customization Advantages

ZTelec Yuguang specializes in providing tailor-made transformers to meet the specific requirements of industrial clients:

• Voltage customization: From 0.4kV to 35kV primary voltage

• Phase angle adjustment: 15°–30° for precise harmonic cancellation

• Cooling solutions: Dry-type ANAF for indoor installations, oil-immersed ONAN for heavy-duty applications

• Special insulation design: For high-temperature or humid environments

• Compact footprint: Optimized for space-limited substations

This ensures that every ZT(P)SFG(H) transformer is optimized for its unique operational environment and load profile, delivering high efficiency and long service life.

ZT(P)SFG(H) series Phase-Shift Rectifier Transformer–ZTELEC

Why ZTelec Yuguang Is the Trusted Manufacturer

• ISO-certified production facilities

• Type-tested and factory-certified transformers

• Global export experience with after-sales support

• Flexible engineering for custom voltage, phase shift, and winding arrangements

These capabilities make ZTelec Yuguang a preferred partner for industries seeking reliable and efficient DC conversion solutions.

Conclusion

Phase-shift transformers, especially the ZT(P)SFG(H) series from ZTelec Yuguang, are indispensable for high-power DC conversion. They reduce harmonics, stabilize voltage, and increase the reliability and lifespan of rectifier systems. By choosing ZTelec Yuguang, industrial operators gain the advantage of custom engineering, high efficiency, and global support, ensuring their power systems meet today’s demands and tomorrow’s challenges.

ZTelec Yuguang is a leading manufacturer of phase-shift rectifier transformers, providing customized dry-type and oil-immersed designs up to 35kV for global industrial power systems.

You may also find these interesting: