Technical Article

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

08-20 2025 | By:

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

A phase-shift rectifier transformer is a specialized electrical device designed to convert alternating current (AC) to direct current (DC) through a rectification process, while incorporating phase-shifting technology to optimize power quality and reduce harmonic distortion. This type of transformer is widely used in industrial applications where precise DC power supply is critical, leveraging its ability to improve system efficiency and reduce electromagnetic interference.

: Phase-Shifting Rectifier Adjustable Voltage Transformer

: Three Phase Five Limb Rectifier Transformer

: Phase-shift Rectifier Transformer

: Phase-Shifting Rectifier Adjustable Voltage Transformer

: Cast Resin Phase Shifting Transformer

Working Principle

Phase-shift rectifier transformers operate by first modifying the phase angle of the input AC voltage through a series of winding configurations. This phase-shifting process allows the rectifier (typically a diode or thyristor bridge) connected to the transformer’s secondary windings to produce a smoother DC output with minimized ripple. By distributing harmonic currents across multiple phases, these transformers effectively reduce total harmonic distortion (THD), enhancing overall system performance and compliance with power quality standards.

Key Applications

Phase-shift rectifier transformers are essential components in various industrial and commercial sectors:

1. Electrochemical Industry: Used in electrolysis processes for metal refining, electroplating, and chemical production, where stable DC current is crucial for consistent product quality.

2. Metallurgical Industry: Applied in steel mills, aluminum smelters, and metal processing plants to power DC drives for rolling mills, extrusion machines, and other heavy machinery.

3. Renewable Energy Systems: Integrated into solar power inverters and wind turbine converters to convert generated AC power to stable DC for battery storage or grid synchronization.

4. Traction Power Systems: Utilized in electric railway and subway systems to provide reliable DC power for traction motors.

5. Industrial Drives: Supporting variable frequency drives (VFDs) and DC motor drives in manufacturing facilities, ensuring precise speed and torque control.

6. Power Supply Units: Used in high-power rectification systems for data centers, telecommunications infrastructure, and industrial UPS (Uninterruptible Power Supply) systems.

Common Specifications and Parameters

Phase-shift rectifier transformers are characterized by several key parameters:

– Rated Power: Typically ranging from 50kVA to 50,000kVA, depending on application requirements.
– Primary Voltage: Usually 10kV, 20kV, 35kV, or custom values based on grid specifications.
– Secondary Voltage: Designed to match rectifier input requirements, often multiple secondary windings with phase shifts (e.g., ±7.5°, ±15°).
– Phase Shift Angle: Commonly 12°, 15°, 30°, or 60°, determined by the number of pulse configurations (12-pulse, 18-pulse, 24-pulse, etc.).
– Cooling Method: Air-cooled (AN) or oil-immersed (ONAN/ONAF) depending on power rating and environmental conditions.
– Insulation Class: Typically F or H class, ensuring operation at high temperatures.
– Short-Circuit Impedance: Customizable based on system protection requirements, usually 5% to 15%.
– Efficiency: Generally exceeding 98% at full load, with high efficiency maintained across partial load conditions.

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

ZTELEC’s ZT(P)SFG(H) Series Phase-Shift Rectifier Transformers

ZTELEC (Zhongtian Electric Equipment Group), a leading manufacturer of power transformers and electrical equipment, offers the ZT(P)SFG(H) series of phase-shift rectifier transformers, renowned for their reliability, efficiency, and advanced design. As an established OEM partner for global industry leaders, ZTELEC combines decades of engineering expertise with strict quality control to produce transformers that meet international standards (IEC, ANSI, GB).

Overview and Features

The ZT(P)SFG(H) series is specifically engineered for high-performance rectification applications, featuring:

– Multi-pulse rectification designs (12-pulse, 18-pulse, 24-pulse) to minimize harmonic distortion below 5%
– Robust construction with vacuum-pressure impregnated (VPI) windings for enhanced insulation and moisture resistance
– Advanced cooling systems for operation in harsh industrial environments
– Customizable phase shift angles to match specific rectifier configurations
– Low noise operation (≤65dB at 1m) suitable for urban and noise-sensitive areas
– Overload capacity of 110% for 24 hours, ensuring reliability during peak demand

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

Technical Parameters of ZT(P)SFG(H) Series

German three phase transformer supplier and manufacturer

Conclusion

Phase-shift rectifier transformers play a critical role in modern power conversion systems, enabling efficient and clean DC power generation across diverse industries. ZTELEC’s ZT(P)SFG(H) series represents the pinnacle of this technology, offering customized solutions that balance performance, reliability, and compliance with global standards. As industries continue to demand higher power quality and energy efficiency, phase-shift rectifier transformers remain essential components in advancing sustainable industrial practices.

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