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High-voltage Power Transformers (69kV - 220kV)
High-voltage Power Transformers (69kV - 220kV) is designed for utility and industrial transmission or subtransmission service. The transformer ratio, MVA rating, insulation levels, cooling arrangement and tap-changer configuration are engineered to match the project network study and approved technical schedule.
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- Overview
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Professional Introduction：
Our high-voltage power transformers (ranging from 69kV to 220kV) represent the pinnacle of reliability in primary grid infrastructure. These units are engineered for high-capacity power transmission between regional networks and large industrial centers. Utilizing advanced 3D electromagnetic field simulation and thermal analysis, we ensure that each transformer is optimized for minimum load and no-load losses. The tanks are designed with high-strength steel to withstand seismic forces and internal pressure, while the internal windings are crafted from high-purity oxygen-free copper to ensure maximum conductivity and longevity. With a focus on sustainable energy, our units are compatible with various cooling methods (ONAN/ONAF/OFAF) to maintain peak performance under the most demanding environmental conditions.
Key Features：
✅High Efficiency: Reduced no-load and load losses exceed international standards (IEC/ANSI).
✅Robust Short-Circuit Capacity: Self-supporting winding structures designed to withstand extreme fault currents.
✅Advanced Dielectric Strength: Vacuum-dried and vacuum-oiled to ensure superior insulation integrity.
✅Quiet Operation: Precision-stacked core laminations for minimal noise pollution.
Technical Specifications：
| Item | Specification |
|---|---|
| Rated Voltage | 69kV, 110kV, 115kV, 132kV, 138kV, 220kV |
| Rated Capacity | 6.3MVA to 400MVA |
| Frequency | 50Hz / 60Hz |
| Cooling Method | ONAN, ONAF, OFAF, ODAF |
| Tapping Range | ±8x1.25% (NLTC / OLTC) |
| Impedance | Per customer requirement (Typ. 8% - 14%) |
| Insulation Level | LI 450 / AC 185 (for 110kV class) |
| Temperature Rise | Oil 55K / Winding 60K (or customizable) |
| Standards Compliance | IEC 60076, ANSI/IEEE C57.12, GOST, AS |
Main Applications：
✅State & National Grid Substations
✅Regional Power Interconnection
✅Large Industrial Plants (Steel, Mining, Chemical)
✅High-capacity Power Generation Integration
✅ Engineering Support: Download typical CAD (.dwg) and PDF outline drawings for your project design.
