Phase Shift Rectifier Transformers – China Supplier
02-24 2025 | By:
Overview
The phase-shifting rectifier transformer is a special transformer designed for medium and high voltage inverters and high power rectifier systems. It achieves harmonic suppression and efficient conversion of electric energy through multi-winding phase-shifting technology. Its core function is to provide multi-phase rectifier power for industrial equipment and solve the harmonic pollution problem generated by traditional rectifier systems. Professional manufacturers represented by ZTELEC GROUP (founded in 1958, with more than 60 years of industry experience) use special winding structures such as Yanbian triangle and hexagon, combined with dry insulation technology, so that the product has fireproof, moisture-proof, heat shock resistance and other characteristics, adapting to the needs of complex industrial environments
Working Principle
Phase-shifting technology: By designing different phase shift angles (such as 0°, ±θ°, 60°-θ°) for multiple three-phase windings on the secondary side, the input voltage phase difference is dispersed to form an equivalent multi-phase output. For example, when each phase consists of n H-bridge units connected in series, θ=60°/n, 6n pulse rectification is achieved, significantly reducing the 5th, 7th, and 11th harmonics. Harmonic suppression mechanism: Multiple rectification technology superimposes current waveforms of different phases to cancel out harmonics. The total harmonic distortion (THD) on the input side can be less than 5%, meeting the requirements of IEEE 519 and other standards.
The Difference From Ordinary Transformers
| Comparison Dimensions | Phase-shifting rectifier transformer | Ordinary transformer |
|---|---|---|
| Structural design | Multi-winding extended triangle or split structure,
support phase shift angle adjustment |
Single winding or fixed phase output |
| Features | Suppress harmonics, improve power factor,
and support multi-pulse rectification |
Only realize voltage conversion and isolation |
| Application Scenario | High-voltage inverters, electrolysis industry
and other harmonic sensitive fields |
Conventional power distribution system |
| Insulation and cooling | H-grade Nomex paper insulation is often used,
supporting air cooling/water cooling hybrid heat dissipation |
Mostly oil-immersed or ordinary dry insulation |
Use scenarios
High-voltage variable frequency speed regulation system: provides stable power supply for motor drives in thermal power plants, metallurgy and chemical industries, with energy saving efficiency of more than 30%.
Electrochemical industry: used in scenarios such as electrolytic aluminum and salt electrolysis, supports 55%-105% wide range voltage regulation, and adapts to process fluctuations.
Special environment applications: explosion-proof and moisture-proof scenarios such as offshore oil platforms and mines, using IP56 protection grade housing and dry design.
Common capacity range
Phase Shifting Transformer Small and medium capacity: 500kVA~3MVA, suitable for integration in inverter unit cabinets (such as 6kV cascade system).
Large capacity: 3MVA~10MVA, mostly used in electrochemical industrial DC power supply systems, requiring water cooling design.
Large capacity: 3MVA~10MVA, mostly used in electrochemical industrial DC power supply systems, requiring water cooling design.
Secondary winding connection method
Yanbian triangle connection: Phase shifting is achieved by adjusting the winding taps. Typical configurations include 3-level phase shifting (0°, ±20°) or 6-level phase shifting (±5°, ±15°, ±25°), forming 18/36 pulse rectification.
Split winding: A three-split or six-split structure is used to independently power multiple power units to improve system redundancy (such as ABB ACS5000 series).
Zigzag connection: Balance the three-phase voltage and reduce zero-sequence harmonics. It is suitable for electrolysis and other scenarios with high requirements for current balance.
ZTELEC GROUP technical advantages
As an industry pioneer, ZTELEC GROUP (founded in 1958) has the following core capabilities in the field of phase-shifting rectifier transformers:
Material innovation: DuPont Nomex® paper insulation system is used, with a temperature resistance of 180°C, and the VIP vacuum pressure impregnation process is used to improve moisture resistance and mechanical strength.
Customized design: supports ANSI/IEEE standard verification, provides ±25° wide range phase shift angle adjustment and MATLAB Simulink simulation model-assisted optimization.
Full-scenario adaptation: covers dry, oil-immersed and air-water cooling hybrid solutions, meets IP22~IP56 protection requirements, and adapts to different climate regions around the world.
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