The 220KV power transformers belong to the high-voltage oil immersed transformer and adopts a core structure. According to the number of phases, it can be divided into single-phase transformers and three-phase transformers; According to the voltage regulation method, it can be divided into load regulation and excitation free regulation; According to the winding coupling method, it can be divided into power transformers and autotransformers; According to the number of windings, it can be divided into double windings, three windings, three windings+balanced windings.
Product Description
The 220KV power transformers belong to the high-voltage oil immersed transformer and adopts a core structure. According to the number of phases, it can be divided into single-phase transformers and three-phase transformers; According to the voltage regulation method, it can be divided into load regulation and excitation free regulation; According to the winding coupling method, it can be divided into power transformers and autotransformers; According to the number of windings, it can be divided into double windings, three windings, three windings+balanced windings. It also includes special types of 220kV transformers such as split transformers and combination transformers. This product is suitable for power plants, substations, large factories and mines, petrochemical enterprises, and other power grid and industrial users.
Product features
1. Low noise, reducing noise pollution to the environment;
2. Low partial discharge ensures stable and reliable operation of transformers;
3. Low temperature rise, strong overload capacity;
4. Low loss, optimized energy structure;
5. No leakage, high transformer sealing performance;
6. Maintenance free, reducing customer repair costs;
7. High impedance, high short-circuit resistance, providing transformer safety performance;
8. Adopting intelligent components and intelligent power plant design technology
Technical Parameter
Table 1. 220KV level three-phase dual winding non excitation voltage regulating power transformer
| Transformer capacity（kVA） | High pressure（kV） | Low pressure（kV） | Connection symbol | No-load loss（kW） | Load loss（kW） | No-load current（％） | Short circuit impedance（％） |
| 31500 | 220 ±2×2.5% 242±2×2.5% | 6.3 6.6 10.5 | YNd11 | 28.0 | 128 | 0.56 | 12--14 |
| 40000 | 32.0 | 149 | 0.56 | ||||
| 50000 | 39.0 | 179 | 0.52 | ||||
| 63000 | 46.0 | 209 | 0.52 | ||||
| 75000 | 10.5 13.8 | 53.0 | 237 | 0.48 | |||
| 90000 | 61.0 | 273 | 0.44 | ||||
| 120000 | 75.0 | 338 | 0.44 | ||||
| 150000 | 10.5 13.8 15.75 18 20 | 89.0 | 400 | 0.40 | |||
| 160000 | 93.0 | 420 | 0.39 | ||||
| 180000 | 102.0 | 459 | 0.36 | ||||
| 240000 | 128.0 | 538 | 0.33 |
Table 2. 220KV level three-phase three winding non excitation voltage regulating power transformer
| Transformer capacity（kVA） | High pressure（kV） | Medium voltage（kV） | Low pressure（kV） | Connection symbol | No-load loss（kW） | Load loss（kW） | No-load current（％） | Short circuit impedance（％） |
| 31500 | 220±2×2.5% 230±2×2.5% 242±2×2.5% | 69 115 121 | 6.3 6.6 10.5 21 36 37 8.5 | YNyn0d11 | 32.0 | 153 | 0.56 | High-medium 12--14 High-Low 22--24 Medium-Low 7--9 |
| 40000 | 38.0 | 183 | 0.50 | |||||
| 50000 | 44.0 | 216 | 0.44 | |||||
| 63000 | 52.0 | 257 | 0.44 | |||||
| 90000 | 10.5 13.8 21 36 37 38.5 | 68.0 | 333 | 0.39 | ||||
| 120000 | 84.0 | 410 | 0.39 | |||||
| 150000 | 10.5 13.8 15.75 21 36 37 38.5 | 100 | 487 | 0.33 | ||||
| 180000 | 113 | 555 | 0.33 | |||||
| 240000 | 140 | 684 | 0.28 | |||||
| 300000 | 166 | 807 | 0.24 |
Table 3. 220KV level three-phase dual winding on load tap changer power transformer
| Transformer capacity（kVA） | High pressure（kV） | Low pressure（kV） | Connection symbol | No-load loss（kW） | Load loss（kW） | No-load current（％） | Short circuit impedance（％） |
| 31500 | 220±8×1.25%； 230±8×1.25% | 6.3 6.6 10.5 21 36 37 38.5 | YNd11 | 30.0 | 128 | 0.57 | 12--14 |
| 40000 | 36.0 | 149 | 0.57 | ||||
| 50000 | 43.0 | 179 | 0.53 | ||||
| 63000 | 50.0 | 209 | 0.53 | ||||
| 90000 | 64.0 | 273 | 0.45 | ||||
| 120000 | 10.5 21 36 37 38.5 | 79.0 | 338 | 0.45 | |||
| 150000 | 92.0 | 400 | 0.41 | ||||
| 180000 | 108 | 459 | 0.38 | ||||
| 120000 | 81.0 | 337 | 0.45 | ||||
| 150000 | 66 69 | 96.0 | 394 | 0.41 | |||
| 180000 | 112 | 451 | 0.38 | ||||
| 240000 | 140 | 560 | 0.30 |
Table 4. 220KV level three-phase three winding on load tap changer power transformer
| Transformer capacity（kVA） | High pressure（kV） | Medium voltage（kV） | Low pressure（kV） | Connection symbol | No-load loss（kW） | Load loss（kW） | No-load current（％） | Short circuit impedance（％） |
| 31500 | 220±8×1.25% 230±8×1.25% | 69 115 121 | 6.3 6.9 10.5 21 36 37 38.5 | YNyn0d11 | 35.0 | 153 | 0.63 | High-medium 12--14 High-Low 22--24 Medium-Low 7--9 |
| 40000 | 41.0 | 183 | 0.60 | |||||
| 50000 | 48.0 | 216 | 0.60 | |||||
| 63000 | 56.0 | 257 | 0.55 | |||||
| 90000 | 10.5 21 36 37 38.5 | 73.0 | 333 | 0.44 | ||||
| 120000 | 92.0 | 410 | 0.44 | |||||
| 150000 | 108 | 487 | 0.39 | |||||
| 180000 | 124 | 598 | 0.39 | |||||
| 240000 | 154 | 741 | 0.35 |
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