For steel mill DC drives and AC-DC variable frequency systems, this oil immersed power transformer pairs multi-group low-voltage windings with a robust industrial power transformer platform, ONAN cooling, and high short-circuit impedance for stable rectifier operation.
The oil-immersed rectifier transformer is designed for steel mill DC motor drives and AC-DC variable frequency drive systems. Its three-phase three-limb core uses cold-rolled grain-oriented silicon steel, while high-conductivity copper windings support stable performance under rectifier loads.
Multi-group low-voltage windings are available in custom configurations and can operate independently or in parallel. High short-circuit impedance improves fault tolerance and multi-output stability, and multi-pulse rectification supports 6, 12, and 24 pulse configurations.
Cooling is ONAN with mineral oil as standard, with ONAF optional. The RAL7035 casing, high overload tolerance, and stable voltage regulation suit heavy-duty industrial operation.
| Rated Capacity | 500 kVA to 100,000 kVA (or higher upon request). A summary also states up to 150 MVA domestic and 100 MVA global. |
|---|---|
| Input Frequency | 50 Hz or 60 Hz |
| Primary Voltage | 6 kV / 10 kV / 35 kV (other grid voltages available) |
| Phase | Three-phase |
| Secondary Voltage | Multiple windings, e.g. 400 V to 1000 V or custom for rectification |
| Core Structure | Three-limb core with high-quality cold-rolled grain-oriented silicon steel |
| Winding Material | High-conductivity copper |
| Short-Circuit Impedance | Higher impedance between LV groups, typically 6% to 10% or customized |
| Cooling Method | ONAN; ONAF optional |
| Temperature Rise | Winding not more than 65 K, oil not more than 60 K (standard) |
| Vector Group | Dyn11, YNd11, or multi-winding custom configurations, including phase-shifting for multi-pulse rectification |
| Tapping Range | ±2 × 2.5% or ±5% (off-load tap changer) |
| Insulation Level | According to IEC 60076 / GB/T 1094 standards |
| Overload Capability | Strong overload tolerance suitable for rectifier and drive loads |
| Additional Options | Multiple secondary windings (2+ groups), high short-circuit withstand, low partial discharge, custom pulse configurations (6/12/24 pulse compatible) |
| Loss/Efficiency Note | No-load loss, load loss, and efficiency comply with or exceed GB/T 6451 and international standards; exact values depend on customer voltage, capacity, and duty cycle. |
| Warranty | 18 months from delivery or 12 months from commissioning, whichever comes first; extended warranty available upon request. |
| Packaging | Robust wooden crate or seaworthy export packaging with moisture-proof and shock-absorbing measures; oil drained or sealed during transport; manuals included. |
Begin with the connected rectifier or DC drive load. Then confirm rated capacity, primary voltage, input frequency, secondary voltage, winding groups, short-circuit impedance, vector group, tapping range, and cooling. ONAN cooling is standard, ONAF is optional, and standard temperature rise is not more than 65 K for the winding and not more than 60 K for the oil.
The transformer is designed for steel mill DC motor drives and AC-DC variable frequency drive systems. Applications include rolling mills, electrochemical processing, harmonic mitigation, and industrial DC power supply.
Multi-group low-voltage windings support independent and parallel operation modes, while high short-circuit impedance helps maintain multi-output stability. The three-phase three-limb core keeps the footprint compact, and high overload tolerance supports heavy-duty industrial operation.
Compliance is stated with IEC 60076 and GB/T standards, and the product introduction also references GB/T 10228. ISO 9001, type test reports, and factory test certificates are stated; CE, UL, or industry-specific approvals can be arranged.
Packaging uses a robust wooden crate or seaworthy export packaging with moisture-proof and shock-absorbing measures. Oil is drained or sealed during transport, and manuals are included. Warranty is 18 months from delivery or 12 months from commissioning, whichever comes first, with extended warranty available upon request.
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View productrated capacity is 500 kva to 100,000 kva, with higher capacities available upon request. a summary also states up to 150 mva domestic and 100 mva global.
standard primary voltages are 6 kv, 10 kv, and 35 kv, with other grid voltages available. input frequency is 50 hz or 60 hz.
onan cooling with mineral oil is standard, and onaf is optional. standard temperature rise is not more than 65 k for the winding and not more than 60 k for the oil.
multi-group low-voltage windings, independent and parallel operation modes, and multi-pulse rectification are supported. configurations are 6, 12, or 24 pulse compatible, and custom pulse configurations are available.
the transformer is designed for steel mill dc motor drives and ac-dc variable frequency drive systems. applications include rolling mills, electrochemical processing, harmonic mitigation, and industrial dc power supply.
compliance is stated with iec 60076 and gb/t standards, with gb/t 10228 also referenced. iso 9001, type test reports, and factory test certificates are stated, and ce, ul, or industry-specific approvals can be arranged. warranty is 18 months from delivery or 12 months from commissioning, whichever comes first. packaging is a robust wooden crate or seaworthy export packaging with moisture-proof and shock-absorbing measures.
