The 220kV Power Transformer engineered by QC Power is a high-reliability, heavy-duty solution designed for bulk electrical energy transmission and primary substation grid infrastructure. Built to withstand extreme electrical stresses, sudden load fluctuations, and severe ambient environments, our 220kV Power Transformer range ensures uninterruptible power flow across utility networks, renewable energy hubs, and energy-intensive industrial complexes.
Manufactured in strict accordance with international standards, including IEC 60076, IEEE C57, and ISO quality management systems, each 220kV Power Transformer reflects superior electromagnetic design, optimal thermal efficiency, and minimal lifecycle operating costs.
| Parameter / Feature | Technical Specification Range |
| Rated Voltage Ratio | Primary: 220kV (±10% / ±8×1.25% OLTC) / Secondary: 11kV, 33kV, 66kV, 110kV |
| Rated Capacity Range | 31.5 MVA to 300 MVA (Three-Phase / Single-Phase Options) |
| Frequency | 50 Hz / 60 Hz |
| Vector Group | Dyn11, YNd11, YNdn0, or customized autotransformer connections |
| Cooling Method | ONAN / ONAF / OFAF / ODAF |
| Tap Changer Type | On-Load Tap Changer (OLTC) / Off-Circuit Tap Changer (OCTC) |
| Short-Circuit Imp. Voltage | 12% – 24% (Engineered to system requirements) |
| Standard Compliance | IEC 60076, IEEE C57.12, ANSI, EN, GB/T 1094 |
Low-Loss Magnetic Core: Fabricated from high-permeability, cold-rolled grain-oriented (CRGO) silicon steel laminations with multi-step lap seam technology. This significantly lowers no-load losses, reduces excitation currents, and minimizes acoustic noise levels.
High Mechanical Strength Windings: Constructed using high-grade oxygen-free copper conductors. Utilizing continuous, transposed (CTC), or helical winding configurations, the 220kV Power Transformer offers exceptional resistance against thermal stress and destructive axial/radial short-circuit forces.
Solid Insulation System: High-density pressboard, thermally upgraded paper, and precision-engineered oil conduits ensure uniform electric field distribution and prevent partial discharge (PD < 10 pC at rated voltage).
High-Performance Transformer Oil: Superior mineral or ester-based insulation oil provides high dielectric strength, rapid heat dissipation, and long-term chemical oxidation resistance.
Hermetically Sealed Tank Construction: Reinforced corrugated or radiator-type oil tanks engineered to withstand full vacuum during oil filling and positive pressure testing.
C5 Corrosion Protection: Epoxy and polyurethane multi-layer paint systems applied via shot-blasting, making the 220kV Power Transformer suitable for harsh coastal, tropical, or highly polluted industrial atmospheres.
Substation Grid Transmission: Serving as primary step-down or step-up transformers in regional transmission networks and bulk power substations.
Renewable Energy Integration: Connecting large-scale utility solar farms and offshore/onshore wind parks directly to national 220kV transmission grids.
Heavy Industrial Facilities: Providing reliable high-capacity power to aluminum smelters, steel mills, chemical manufacturing plants, and mining sites.
Cross-Border Interconnections: Facilitating long-distance regional grid interconnections with high grid stability and minimal transmission loss.
Every 220kV Power Transformer dispatched from QC Power undergoes comprehensive factory acceptance testing (FAT) inside our fully equipped high-voltage testing laboratory.
Routine Tests: Winding resistance measurement, voltage ratio and vector group verification, insulation resistance, short-circuit impedance, and partial discharge measurement.
Type & Special Tests: Lightning impulse withstand tests, temperature rise tests, short-circuit withstand capability verification, and sound level measurement in full compliance with IEC 60076 specifications.
Turnkey Customization: Fully tailors electrical parameters, terminal layout (bushing or cable box), protection relays, and dimensions to match your site-specific civil constraints.
Global Logistics & Export Expertise: Proven track record in supplying custom high-voltage transformers across Latin America, Southeast Asia, the Middle East, and Europe.
Lifecycle Technical Support: Comprehensive engineering support spanning pre-sale design consultations, on-site installation guidance, commissioning, and preventive maintenance.
