| Quantity: | |
|---|---|
Define the required rated DC voltage, DC current, and DC power. These determine the transformer secondary voltage and current ratings, as well as the rectifier circuit configuration. Consider overload capacity and duty cycle.
Specify the primary voltage, frequency (50 Hz or 60 Hz), and number of phases. Confirm whether the input is from a dedicated feeder or shared bus, and whether voltage fluctuation or unbalance exists.
Select the rectifier pulse number:
6-pulse: Simple, lower cost, higher harmonic content.
12-pulse: Two secondary windings with 30° phase shift, reduced harmonics.
24-pulse: Four secondary windings, further harmonic reduction, suitable for large DC loads.
The pulse number determines the number of secondary windings, phase shift angles, and winding connections.
Choose the winding connection (e.g., delta, wye, zigzag) and impedance percentage. Impedance affects short-circuit current, parallel operation, and harmonic sharing. For multi-winding transformers, specify the phase shift between secondary windings.
Select according to installation environment and load profile:
AN (Natural Air): For low to medium capacity, indoor, clean environment.
AF (Forced Air): Higher capacity with fans, indoor.
ONAN (Oil Natural Air Natural): Oil-immersed, outdoor or indoor.
ONAF (Oil Natural Air Forced): Higher capacity, oil-immersed with fans.
OFAF (Oil Forced Air Forced): Very high capacity, forced oil circulation.
Water-cooled: For extremely high power density or restricted space.
Specify insulation class (e.g., Class F, Class H) and permissible temperature rise. Higher temperature rise reduces size and cost but may affect life. Consider ambient temperature, altitude, and ventilation.
Define maximum allowable no-load loss and load loss. Low-loss designs use high-grade silicon steel, optimized core geometry, and high-conductivity copper windings. Confirm whether meeting specific efficiency standards (e.g., IEC 60076-20, GB 20052) is required.
Indoor/Outdoor: Affects enclosure, cooling, and protection degree.
Altitude: Above 1000 m requires derating or special insulation.
Ambient temperature: High ambient reduces capacity; low ambient affects oil viscosity.
Humidity and pollution: Specify creepage distance and corrosion protection.
Seismic and wind load: For outdoor installation, confirm mechanical design.
Specify applicable standards: IEC 60076, GB 1094, IEEE C57.12.00, etc. Routine tests include winding resistance, ratio, impedance, no-load loss, load loss, dielectric tests, and temperature rise. Type tests may include lightning impulse, short-circuit, and harmonic measurement.
Confirm allowable footprint, height, and weight for transport and installation. For oil-immersed units, consider oil volume and maintenance access. For dry-type, consider clearance for cooling.
| Parameter | Unit | Typical Range / Option |
|---|---|---|
| Type | — | Rectifier transformer, dry-type or oil-immersed |
| Rated DC Voltage | V | 50 – 2000 |
| Rated DC Current | A | 100 – 100,000 |
| Rated DC Power | kW | 50 – 200,000 |
| Primary Voltage | kV | 0.4 – 220 |
| Frequency | Hz | 50 / 60 |
| Number of Phases | — | 3 |
| Rectifier Pulse Number | — | 6, 12, 24, or custom |
| Secondary Windings | — | 1 – 4 or more |
| Phase Shift | ° | 0 – 30 (between windings) |
| Winding Material | — | Copper / Aluminium |
| Core Material | — | Grain-oriented silicon steel |
| Cooling Method | — | AN, AF, ONAN, ONAF, OFAF, water-cooled |
| Insulation Class | — | F / H |
| Temperature Rise | K | 60 – 100 (custom) |
| Impedance | % | 4 – 12 (custom) |
| No-load Loss | kW | According to design and standard |
| Load Loss | kW | According to design and standard |
| Efficiency | % | ≥ 98 (at rated load) |
| Protection Degree | IP | IP00 – IP54 |
| Altitude | m | ≤ 1000 (standard); >1000 with derating |
| Ambient Temperature | °C | -25 to +45 (standard) |
| Standards | — | IEC 60076, GB 1094, IEEE C57.12.00 |
| Installation | — | Indoor / Outdoor |
Note: All parameters are customizable based on application requirements. Confirm actual design data before ordering.
Electrolysis and electroplating rectifier systems
Aluminium, copper, and zinc smelting
DC arc furnaces and induction heating
Traction power supply for railways and metros
DC drives for rolling mills and paper machines
Hydrogen production and electrochemical processes
High-power DC testing and research facilities
RECTIFIER TRANSFORMER
Rectifier Transformers is the power of the rectifier equipment, most DC power source and the DC power supply of electronic system are supplied by AC network and the equipment which is composed by the rectifier transformers and rectifier. So the rectifier transformer are widely used in electro chemical e l e c tr o l y s i s , e l e c tr o n i c tr a c t i o n , DC power transmission, frequency conversion and industry rectifier power.etc. All of these transformers are low loss and energy-saving products and could be special designed according to the customer's requirement.
1. Ambient Temperature: Max temp, +40°C, Min temp ,-30°(revise if it is beyond the range )
2. Altitude : ＜1000m (temperature rise and external insulation distance to be modified if> 1000m)
3. Relative humidity : ＜90% (25℃ )
4.External Pollution Class : 4
