Special Transformer
Three Phase Rectifier Transformer – IP Series
Model： Three Phase Rectifier Transformer
Engineered for High Harmonics, Powering Heavy DC Conversion with Uncompromising Reliability.
- Capacity: 100 kVA - 20 MVA
- Rectification: 12 / 24-Pulse
- Harmonic Rating: K-13 / K-20
- Peak Efficiency: Up to 98.5%
Specifications
| Item | Value |
|---|---|
| Rated Capacity | 100 kVA to 20,000 kVA (Custom engineered configurations available). |
| Rated Frequency | 50 Hz / 60 Hz. |
| Primary Rated Voltage (Low Voltage) | 220 V / 380 V / 440 V / 480 V / 690 V |
| Primary Rated Voltage (Medium/High Voltage) | 3.3 kV / 6.6 kV / 11.4 kV / 22.8 kV / 34.5 kV |
| Secondary Rated Voltage | Custom designed based on specific DC bus requirements and bridge topologies (AC 50 V to 1,500 V). |
| Vector Group & Pulse Configurations | 6-Pulse: Dy11, Yd11, Dd0, Yy0; 12-Pulse: Dd0y11, Dy11d0; 24-Pulse |
| Impedance Voltage (%Z) | 4.0% to 12.0% (Optimized for harmonic mitigation ratios, commutating overlap angles, and short-circuit protection limits). |
| Thermal Insulation Class | Class F, Class H |
| Harmonic K-Factor | K-4, K-9, K-13, K-20, K-30. |
| Enclosure Protection Ratings | IP00 (Core & Coil open type), IP20, IP23, IP54 (Heavy-duty outdoor weather-resistant enclosures). |
| Instrumentation & Protection Accessories | Embedded PT100 RTDs, multi-channel temperature controllers, sudden pressure relays, Buchholz relays (for liquid-filled variants), pressure relief valves, and De-Energized / On-Load Tap Changers (NLTC / OLTC). |
| Applicable Standards | IEC 61378-1 (Convertor Transformers), IEC 60076, IEEE C57.18.10, CNS 13390. |
Applications
- Heavy-Duty Variable Frequency Drive (VFD) Systems: Front-end rectification for medium- and high-voltage motor drives, fans, pumps, compressors, and extruders, mitigating high-order harmonic feedback to the power grid.
- Electrochemical & Surface Finishing Operations: Low-voltage, ultra-high-current DC power supplies for industrial electrolytic cells (aluminum and copper refining, chlor-alkali plants), high-capacity electroplating, and anodizing lines.
- Green Hydrogen Electrolysis Facilities: Robust AC/DC front-end power conversion and galvanic isolation for utility-scale Alkaline (ALK) and Proton Exchange Membrane (PEM) water electrolyzers.
- Traction DC Substations for Rail Transit: Multi-pulse power receiving infrastructure for urban metro systems, light rail, and railways (DC 750V / DC 1500V networks).
- Battery Energy Storage Systems (BESS) & DC Microgrids: Grid-tied isolation and DC bus voltage matching for high-power conversion systems (PCS) and energy storage substations.
- DC Arc Furnaces & Metallurgical Heating Plants: Smelting facilities requiring heavy surge withstand capabilities against severe cyclic thermal and mechanical short-circuit stresses.
- Mission-Critical UPS & High-Voltage DC Infrastructure: Large-scale HVDC power plants and industrial-grade UPS rectifiers/chargers for hyper-scale data centers and advanced semiconductor fabs.
Product Features
- Advanced Harmonic Cancellation via Multi-Pulse Phase Shifting: Configurable in 12-pulse, 18-pulse, and 24-pulse topologies with phase-shift displacements (30°, 15°, 7.5°), eliminating 5th, 7th, 11th, and 13th harmonic currents at the source in full compliance with IEEE 519 standards.
- Engineered Harmonic Thermal Endurance: Rated for high non-sinusoidal harmonic profiles (K-Factor 13 / 20+), utilizing transposed conductors and oversized cross-sectional geometries to minimize skin effect, eddy-current losses, and structural stray heat dissipation.
- Strict Impedance Symmetry & Current-Sharing Balance: Precision-controlled percentage impedance (%Z) tolerances across all secondary windings to guarantee optimal current balancing across parallel rectifier bridges, preventing device overcurrent failures.
- Reinforced Mechanical Strength & Short-Circuit Withstand: Rigid circular concentric winding design and vacuum cast-resin encapsulation capable of enduring the repetitive electromechanical stresses of commutating notches and direct DC-side short circuits.
- Full Electrostatic Shielding (Faraday Shield): Non-inductive grounded copper shielding positioned between primary and secondary windings, blocking high-frequency capacitive coupling, common-mode noise, and voltage transients (dv/dt) from penetrating the main electrical grid.
- DC Pre-Magnetization Resilience & Low-Loss Magnetic Core: High-permeability, low-loss Cold-Rolled Grain-Oriented (CRGO) electrical steel or amorphous metal cores assembled with step-lap mitered joints to minimize no-load losses, excitation inrush currents, and core saturation risks.