ISO 9001 : 2015 Certified  |  CE Certified  |  SGS Audited Special Transformer Production Base in China

Rectifier Transformer

Rectifier transformer for electrolysis and DC drive applications

Rectifier Transformer

DC power supply equipment · 0.38–35kV · 50–25,000kVA

The rectifier transformer is the most widely applied type of power supply equipment. Working together with rectifier devices, it converts the AC network voltage into the voltage and phase configuration required by the rectifier, delivering stable DC power to electrochemical and drive processes.

  • For non-ferrous metal electrolysis and electrochemical plants
  • Vacuum consumable arc furnace and medium-frequency induction furnace supply
  • DC drive and silicon carbide electric-heating crystallization applications
  • Matching rectifier connection groups and phase-shifting windings available
Request a Quotation

Product Overview

Rectifier transformers are used wherever industrial processes need large, controllable DC power. The transformer feeds a rectifier unit (diode or thyristor bridge), and its secondary windings are configured in connection groups matched to the rectifier circuit — often with phase-shifting windings to reduce harmonic feedback into the supply network. Because electrolytic loads run continuously at high current, the design emphasizes low losses, strong thermal margin and reliable long-term operation.

Series & Applications

Our 0.38–35kV, 50–25,000kVA rectifier transformer series covers:

  • Rectifier transformers for non-ferrous metal electrolysis — copper, zinc, aluminum and other metal refining electrolysis cells
  • Rectifier transformers for electrochemistry — chlor-alkali, hydrogen production by electrolysis of water, and other electrochemical processes
  • Rectifier transformers for vacuum consumable (self-consuming electrode) arc furnaces — remelting of special steels and superalloys
  • Rectifier transformers for medium-frequency induction furnaces — as the front-end supply of medium-frequency power units
  • Rectifier transformers for DC drive — rolling mills, mine hoists and other DC motor drive systems
  • Supply for silicon carbide electric-heating crystallization and similar processes

Key Features

  • Matched to rectifier circuit: secondary connection groups (e.g. double-star, double-bridge with phase shift) designed per the rectifier scheme.
  • Harmonic-tolerant design: windings and cooling sized for the additional eddy-current heating caused by rectifier harmonic currents.
  • Wide regulation: on-load tap changing or OLTC plus thyristor control combinations for precise DC voltage control.
  • Continuous duty: robust thermal design for 24-hour high-current electrolytic operation.

Technical Parameters (Typical Range)

Voltage class0.38 – 35 kV
Rated capacity50 – 25,000 kVA
ApplicationsNon-ferrous electrolysis, electrochemistry, vacuum consumable arc furnace, medium-frequency induction furnace, DC drive, SiC crystallization
Secondary connectionPer rectifier circuit (star/delta/double-star/phase-shifted combinations)
Voltage regulationNo-load / on-load tap changing per process requirement
CoolingONAN / ONAF / OFWF per capacity
StandardsNational standards for rectifier transformers; ISO 9001:2015 quality system

Note: the table shows the standard range. Please send your rectifier circuit, DC voltage/current and load profile for an optimized design and quotation.

Other Products