Special Type Transformers
Product Overview
Our special-type transformers represent the peak of custom-engineered power solutions. Designed to handle severe harmonic loads, unbalanced currents, and extreme thermal overloading, these units are tailored for specialized industrial sectors such as steel fabrication, chemical electrolysis, electric railway networks, and large utility-scale solar photovoltaic (PV) generation plants.
Key Advantages
Bespoke Phase Shifting
Precision configuration of winding angles (e.g. ±15°, ±7.5° or custom vector shifts) to suppress harmonics in 12, 18, or 24-pulse rectifier operations.
Enhanced Short-Circuit Strength
Internal clamping elements designed using Finite Element Method (FEM) simulation to counter severe radial and axial stress.
High Thermal Endurance
Utilizes Nomex insulation paper or synthetic ester fluids, allowing operation at elevated temperature rises during cyclic peak loading.
Environmental Resilience
Engineered with dust-tight enclosures, specialized cooling systems, and robust finishes for underground mines or offshore environments.
Core Parameters
Custom (up to 30 MVA)
Up to 145 kV / 245 kV
IEC 60076 / IEEE C57
Technical Specification Data
| Technical Parameter | Standard Range / Option |
|---|---|
| Applicable Power Range | 100 kVA up to 30 MVA |
| Voltage Configurations | Up to 145 kV / 245 kV primary classes |
| Winding Vector Groups | ZNyn11, Ii0, Dd0y1, Dd0d6, Dy11y11 (custom multi-winding schemes) |
| Harmonics Capacity | Configured up to K-factor 20+ to withstand non-linear converter currents |
| Cooling Methods | ONAN, ONAF, OFAF, ODAF, or Water-cooled (OFWF / WF) |
| Tapping Regulation | OCTC or OLTC with extended tap steps up to 17 or 23 positions |
| Core Structure Type | Step-lap stacked high-grade CRGO sheet steel core with rigid glass-fiber bands |
| Applicable Standard guidelines | IEC 60076-1 through 60076-6, IEEE C57.18.10 (rectifier class) |
Standard & Optional Accessories
Testing & Quality Assurance
Special type transformers require meticulous testing. Alongside standard routine electrical measurements, we perform specialized verification procedures as required by the application. These include: zero-sequence impedance measurement, harmonics validation, magnetic balance check on multi-windings, insulation tangent delta, and partial discharge level testing to confirm structural integrity.
Compliance Standard
ISO 9001 & IEC 60076 Verified
Need a custom-engineered special transformer?
Provide your electrical configuration, harmonic load spectrum, and space envelope. Our specialist engineering team will design the ideal system.