220kV-class oil-immersed transformer
220kV Oil-Immersed Transformer
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Technical Performance
Technical Specification
• Standards: IEC, GB, ANSI/IEEE, NEMA
• Capacity: 31,500–240,000 kVA
• Primary-side rated voltage: 220–242 kV
• Secondary-side rated voltage: 6.3–69 kV
• Number of tap positions: 5–17
• Frequency: 50/60 Hz
• Number of phases: Three-phase
• Connection Group: YNd11, etc.
• Impedance: 12%–14%
Performance Features
• Low losses: Meets the energy efficiency requirements specified in GB 20052-2024, “Minimum Energy Performance Standards and Energy Efficiency Classes for Power Transformers.”
• Low noise: The self-cooling noise level will be below 60 dB;
• Low partial discharge: Partial discharge levels are kept below 100 pC;
• Strong short-circuit resistance: The coil is supported by a high‑quality insulating skeleton, and the tank side walls are formed in a single step using laser cutting.
• Attractive appearance: Fully polished and derusted, with powder electrostatic coating that achieves the finish of household appliance paintwork;
• Leak-proof: All sealing flanges feature a grooved design, the drain valve is made of copper, and the radiator is equipped with a vacuum‑sealed butterfly valve, ensuring superior sealing performance.
Precautions
Please inquire.
Warranty period
Please inquire.
⌟ Fuel tank
Three‑stage leak‑testing of the minute‑cover and bucket‑type structural sealing with a stop‑shoulder limit.
⌟ Iron core
The high-permeability silicon steel laminations feature a hole-free, band‑wound frame structure, utilizing premium, high‑permeability grain-oriented silicon steel. A 45° full‑skew lap‑joint process is employed, and the surface is coated with a special moisture‑ and rust‑resistant finish, effectively reducing no‑load losses, no‑load current, and noise levels.
⌟ coil
Guided oil circulation system, with a 30-year product design life.
⌟ Insulation
High-temperature-resistant hybrid insulation, customizable to meet customer requirements by incorporating DuPont’s advanced Nomex® insulation materials and transformer insulating oil, ensures that the product delivers superior performance in terms of high overload capability, extended service life, enhanced reliability, heightened safety, and increased energy density.
Details and Specifications
Rated capacity | Level 1 | Level 2 | Level 3 | Short-circuit impedance | ||||
No-load loss | Load loss | No-load loss | Load loss | No-load loss | Load loss | |||
31500 | 17 | 115 | 20 | 115 | 24 | 122 | 12~14 | |
40000 | 20 | 134 | 23 | 134 | 29 | 142 | ||
50000 | 23 | 161 | 28 | 161 | 34 | 170 | ||
63000 | 28 | 188 | 33 | 188 | 40 | 199 | ||
90000 | 35 | 246 | 42 | 246 | 51 | 259 | ||
120000 | 43 | 304 | 51 | 304 | 63 | 321 | ||
150000 | 51 | 360 | 60 | 360 | 74 | 380 | ||
180000 | 59 | 413 | 70 | 413 | 86 | 436 | ||
120000 | Low pressure | 45 | 303 | 53 | 303 | 65 | 320 | |
150000 | 53 | 355 | 62 | 355 | 77 | 374 | ||
180000 | 62 | 406 | 73 | 406 | 90 | 428 | ||
240000 | 77 | 504 | 91 | 504 | 112 | 532 | ||
Note: Energy efficiency class of 220 kV oil-immersed three-phase, double-winding, on-load tap-changing power transformers.
The data in the table are for reference only; the company reserves the right to modify the data and accepts special orders.
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