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220kV Power Transformer up to 360MVA
The 220kV Oil-Immersed Power Transformer series represents our advanced engineering in extra-high voltage (EHV) equipment. These units are specifically designed for large-scale power grids, heavy industrial complexes, and major power stations. By utilizing premium-grade magnetic materials and optimized insulation structures, our 220kV transformers deliver exceptional reliability with ultra-low loss and reduced noise levels.
Electrical ProductsKey Features of 220kV Oil-Immersed Power Transformer
Low Partial Discharge Design: The internal structure is meticulously processed in a dust-free environment to ensure partial discharge levels remain well below industry standards, extending the transformer’s service life.
Superior Short-Circuit Strength: Coils are reinforced with high-density insulation components and advanced clamping systems to withstand the mechanical stresses of sudden short-circuit events.
Optimized Magnetic Circuit: Features a high-quality, cold-rolled grain-oriented (CRGO) silicon steel core with a multi-step mitered joint structure to minimize no-load loss and magnetizing current.
Advanced Cooling & Tank Integrity: Equipped with high-efficiency cooling systems (ONAN/ONAF) and a robust, vacuum-tested bell-type tank to prevent oil leakage and ensure thermal stability under full load.
Structural & Workmanship Features
High-Precision Winding: Precise tension control during the winding process ensures tight coils and consistent impedance.
Reliable Sealing System: All gaskets and seals are made of high-quality nitrile rubber or specialized materials to ensure a 30-year maintenance-free tank seal.
Smart Monitoring (Optional): Can be equipped with online dissolved gas analysis (DGA) and fiber-optic temperature sensors for real-time health monitoring
Main Technical Parameters
Our 220kV range includes Double-winding and Three-winding configurations with On-load Tap Changers (OLTC).
220kV two-winding off-circuit tap-changer power transformer
| Rated Capacity (kVA) | Voltage Combination | Connection Symbol | No-load loss(kW) | Full-load loss(kW) | Short‑Circuit Impedance (%) | No-load current(%) | ||
| High Voltage (kV) | HV Tapping Range | Low Voltage (kV) | ||||||
| 31500 | 220 242 |
±2×2.5% | 6.3 6.6 10.5 11 |
YNd11 | 35 | 135 | 12-14 | 0.7 |
| 40000 | 41 | 157 | 0.7 | |||||
| 50000 | 49 | 189 | 0.65 | |||||
| 63000 | 58 | 220 | 0.65 | |||||
| 75000 | 10.5 11 13.8 |
67 | 250 | 0.6 | ||||
| 90000 | 77 | 288 | 0.55 | |||||
| 120000 | 94 | 345 | 0.55 | |||||
| 150000 | 11 13.8 15.75 20 |
112 | 405 | 0.5 | ||||
| 180000 | 128 | 459 | 0.46 | |||||
| 240000 | 160 | 567 | 0.42 | |||||
| 300000 | 15.75 18 20 |
189 | 675 | 0.38 | ||||
| 360000 | 217 | 774 | 0.38 | |||||
220kV two-winding off-circuit tap-changer power transformer with 66kV low-voltage side
| Rated Capacity (kVA) | Voltage Combination | Connection Symbol | No-load loss(kW) | Full-load loss(kW) | Short‑Circuit Impedance (%) | No-load current(%) | ||
| High Voltage (kV) | HV Tapping Range | Low Voltage (kV) | ||||||
| 31500 | 220 | ±2×2.5% | 6.3 6.6 6.9 |
YNd11 | 38 | 151 | 12-14 | 0.89 |
| 40000 | 45 | 176 | 0.89 | |||||
| 50000 | 53 | 211 | 0.82 | |||||
| 63000 | 63 | 247 | 0.82 | |||||
| 90000 | 83 | 323 | 0.75 | |||||
| 120000 | 102 | 387 | 0.75 | |||||
| 150000 | 122 | 453 | 0.68 | |||||
| 180000 | 138 | 513 | 0.68 | |||||
| 240000 | 171 | 635 | 0.61 | |||||
220kV two-winding on-load tap-changer power transformer
| Rated Capacity (kVA) | Voltage Combination | Connection Symbol | No-load loss(kW) | Full-load loss(kW) | Short‑Circuit Impedance (%) | No-load current(%) | ||
| High Voltage (kV) | HV Tapping Range | Low Voltage (kV) | ||||||
| 31500 | 220 | ±8×1.25% | 6.3 6.6 10.5 11 35 37 38.5 |
YNd11 | 38 | 135 | 12-14 | 0.7 |
| 40000 | 45 | 157 | 0.63 | |||||
| 50000 | 54 | 189 | 0.56 | |||||
| 63000 | 63 | 220 | 0.56 | |||||
| 90000 | 10.5 11 35 37 38.5 |
80 | 288 | 0.49 | ||||
| 120000 | 99 | 346 | 0.49 | |||||
| 150000 | 116 | 405 | 0.42 | |||||
| 180000 | 135 | 468 | 0.42 | |||||
| 120000 | 66 69 |
102 | 355 | 0.49 | ||||
| 150000 | 120 | 415 | 0.42 | |||||
| 180000 | 140 | 475 | 0.42 | |||||
220kV three-winding off-circuit tap-changer power transformer
| Rated Capacity (kVA) | Voltage combination and tap range (kV) | Connection Symbol | No-load loss(kW) | Full-load loss(kW) | Short‑Circuit Impedance (%) | No-load current(%) | |||
| High Voltage (HV) | Medium Voltage (MV) | Low Voltage (LV) | step-up | step-down | |||||
| 31500 | 220 242 ±2×2.5% |
69 115 121 |
6.3 6.6 10.5 11 35 37 38.5 |
YNyn0d11 | 40 | 162 | H-M 22-24H-L 12-14M-L 7-9 |
H-L 22-24H-M 12-14M-L 7-9 |
0.7 |
| 40000 | 48 | 189 | 0.63 | ||||||
| 50000 | 56 | 225 | 0.56 | ||||||
| 63000 | 66 | 261 | 0.56 | ||||||
| 90000 | 10.5 11 13.8 35 37 38.5 |
86 | 351 | 0.49 | |||||
| 120000 | 106 | 432 | 0.49 | ||||||
| 150000 | 11 13.8 15.75 35 37 38.5 |
125 | 513 | 0.42 | |||||
| 180000 | 142 | 585 | 0.42 | ||||||
| 240000 | 176 | 720 | 0.35 | ||||||
| 300000 | 208 | 750 | 0.3 | ||||||
220kV three-winding off-circuit tap-changer autotransformer
| Rated Capacity (kVA) | Voltage combination and tap range (kV) | Connection Symbol | No-load loss(kW) | Full-load loss(kW) | Short‑Circuit Impedance (%) | No-load current(%) | |||||
| High Voltage (HV) | Medium Voltage (MV) | Low Voltage (LV) | step-up | step-down | step-up | step-down | step-up | step-down | |||
| 31500 | 220 242 ±2×2.5% |
115 121 |
6.6 10.5 11 35 37 38.5 |
YNyn0d11 | 25 | 22 | 117 | 99 | H-M 12-14H-L 8-12M-L 14-18 |
H-M 8-10H-L 28-34M-L 18-24 |
0.5 |
| 40000 | 29 | 26 | 144 | 121 | 0.5 | ||||||
| 50000 | 34 | 30 | 170 | 144 | 0.43 | ||||||
| 63000 | 40 | 36 | 201 | 171 | 0.43 | ||||||
| 90000 | 50 | 46 | 276 | 234 | 0.36 | ||||||
| 120000 | 10.5 11 13.8 15.75 18 35 37 38.5 |
62 | 56 | 340 | 288 | 0.36 | |||||
| 150000 | 70 | 60 | 405 | 342 | 0.33 | ||||||
| 180000 | 80 | 72 | 464 | 387 | 0.33 | ||||||
| 240000 | 95 | 86 | 595 | 504 | 0.25 | ||||||
220kV three-winding on-load tap-changer power transformer
| Rated Capacity (kVA) | Voltage combination and tap range (kV) | Connection Symbol | No-load loss(kW) | Full-load loss(kW) | Short‑Circuit Impedance (%) | No-load current(%) | ||
| High Voltage (HV) | Medium Voltage (MV) | Low Voltage (LV) | ||||||
| 31500 | 220 ±8×1.25% |
69 115 121 |
6.3 6.6 10.5 11 35 37 38.5 |
YNyn0d11 | 44 | 162 | H-L 22-24H-M 12-14M-L 7-9 |
0.77 |
| 40000 | 52 | 189 | 0.7 | |||||
| 50000 | 60 | 225 | 0.63 | |||||
| 63000 | 70 | 261 | 0.63 | |||||
| 90000 | 10.5 11 35 37 38.5 |
92 | 351 | 0.56 | ||||
| 120000 | 115 | 432 | 0.56 | |||||
| 150000 | 135 | 513 | 0.49 | |||||
| 180000 | 159 | 630 | 0.49 | |||||
| 240000 | 193 | 780 | 0.45 | |||||
220kV three-winding on-load tap-changer autotransformer
| Rated Capacity (kVA) | Voltage combination and tap range (kV) | Connection Symbol | No-load loss(kW) | Full-load loss(kW) | Short‑Circuit Impedance (%) | No-load current(%) | ||
| High Voltage (HV) | Medium Voltage (MV) | Low Voltage (LV) | ||||||
| 31500 | 220 ±8×1.25% |
115 121 |
6.3 6.6 10.5 11 35 37 38.5 |
YNyn0d11 | 25 | 108 | H-L 28-34H-M 8-10M-L 18-24 |
0.56 |
| 40000 | 30 | 132 | 0.56 | |||||
| 50000 | 36 | 157 | 0.49 | |||||
| 63000 | 42 | 189 | 0.49 | |||||
| 90000 | 51 | 247 | 0.42 | |||||
| 120000 | 10.5 11 35 37 38.5 |
64 | 308 | 0.42 | ||||
| 150000 | 76 | 365 | 0.35 | |||||
| 180000 | 85 | 419 | 0.35 | |||||
| 240000 | 104 | 540 | 0.3 | |||||
Why Partner with Us?
Proven Track Record: Successfully deployed in numerous 220kV substations with zero major insulation failures reported.
Custom Engineering: We provide tailored voltage ratios and vector groups (e.g., YNyn0d11) to match specific regional grid requirements.
Global Compliance: Full adherence to international IEC and ANSI/IEEE standards for seamless integration into global energy projects.
Get in Touch with Liyond
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