Isolation (Rectifier) Transformers
Isolation transformers also known as rectifier transformers are specialized units used to electrically isolate power sources from sensitive or controlled loads. In rectifier applications, they serve as the interface between the AC power supply and DC rectification systems, such as those used in electrolysis, battery charging stations, traction substations, and data centers. These transformers must withstand nonlinear loads, high harmonic content, and continuous thermal stress, while ensuring galvanic separation and voltage adaptation.
TEK Transformatör designs rectifier transformers in accordance with IEC and IEEE standards, offering customized solutions for 6-pulse, 12-pulse, or multi-pulse rectifier configurations.
Technical Features & Capabilities
Designed for AC–DC conversion systems, such as:
- Chlorine and hydrogen electrolysis systems and plating plants
- EV charging stations
- Industrial DC drives
- Data centers and UPS systems
- Traction substations (railway and metro)
- Supports 6-pulse, 12-pulse, and 24-pulse rectifier circuits with custom phase-shifting
- Provides electrical isolation, voltage transformation, and harmonic mitigation
- Winding Configurations: Delta–Zig-Zag, Delta–Star, or multi-winding vector groups
- Thermal Class: F or H, with enhanced insulation and cooling systems for continuous operation under harmonic stress
- Core and windings sized to handle K-rated loads or specified harmonic spectra
- Cooling Types: ONAN, ONAF, KNAN or forced oil and water cooling for high-capacity systems
- Optional electrostatic shield between windings for common-mode noise suppression
- Designed to withstand high ripple currents, DC bias, and overvoltage transients
Unique Phase-Shifting & Harmonic Mitigation
In multi-pulse rectifier systems, phase-shifted windings are used to reduce harmonic distortion on the AC supply side. By configuring the transformer with dual secondary windings at phase angles such as ±30°, specific harmonics (like the 5th and 7th) are naturally cancelled at the point of common coupling. This reduces THD (Total Harmonic Distortion), improves power quality, and minimizes the need for external filters. TEK designs custom vector group arrangements to meet customer harmonic limits and grid code requirements.
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