12, 18 & 24 Pulse Rectifier Transformers
Multi-pulse rectifier transformers engineered for high-current DC conversion — 12, 18, and 24 pulse configurations that minimise harmonic distortion and maximise process efficiency for electrochemical, smelting, and heavy industrial applications.
Engineering Features
Multi-Pulse Phase-Shifting Windings
12, 18, or 24-pulse phase-shifting secondaries cancel low-order harmonics at the source — eliminates need for downstream filters.
Technical Data
| Parameter | Range / Value |
|---|---|
| Rated Power | 1 – 80 MVA |
| Primary Voltage | Up to 36 kV |
| Secondary Voltage | Project-specific (typ. 200–1500 V DC) |
| Frequency | 50 / 60 Hz |
| Pulse Configuration | 12 / 18 / 24 pulse |
| Winding Geometry | Extended Delta / Polygon |
| K-Factor Rating | K-13 to K-30 |
| Cooling | OFAF / OFWF / ODAF |
| Partial Discharge | ≤ 10 pC at 1.5 × Um |
| Standards | IEC 61378 / IEEE C57.18.10 |
Standard range parameters — custom specifications available on request.
IEEE C57.12
ANSI/IEEE distribution transformer standard
ANSI C57.12.00
General requirements liquid-immersed
DOE 2016
US Department of Energy efficiency rule
NEMA TR1
Sound level & loss tolerances
UL Listed
Underwriters Laboratories safety mark
IEEE C57.110
Harmonic-loaded transformer rating
Rectifier transformers for North American industrial DC and traction service — chlor-alkali electrolysis, aluminium smelting, copper refining, DC drives and transit-rail traction. 500 kVA to 50 MVA at up to 138 kV per IEEE C57.18.10 / IEEE C57.12.00, with 12-, 18- and 24-pulse configurations for IEEE 519 harmonic compliance.
Aluminium Smelters · Pacific Northwest
Chlor-Alkali & Chemical Electrolysis · Gulf Coast
Copper Refineries · Arizona & Utah
Transit-Rail DC Traction · NYCT, BART, MARTA
Industrial DC Drives · Steel, Mining, Cement
Hydrogen Electrolyser Plants · USA
Where 12, 18 & 24 Pulse Rectifier Transformers Excel.
Aluminium Smelters Pacific Northwest
IEEE C57.18.10 rectifier transformers for US aluminium smelters — high-current cyclic DC service for primary metal production.
Chlor-Alkali & Chemical Electrolysis
Multi-pulse rectifier transformers for Gulf-Coast chlor-alkali plants and electrochemical industrial processes — IEEE 519 compliant.
Transit-Rail DC Traction USA
Rectifier transformers for NYCT, BART, MARTA and US transit-rail DC traction substations — 12/18 pulse for low harmonic distortion.
Hydrogen Electrolyser Plants USA
IEEE C57.18.10 rectifier transformers for US green-hydrogen electrolyser plants — bidirectional and harmonic-tolerant.
Frequently Asked Questions
Deployed in
Ready to Specify Rectifier Transformers?
Share your technical requirements and our engineering team will provide a detailed proposal with guaranteed performance parameters.