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220kV oil-immersed main transformers are high-voltage core power equipment for regional power grid substations, large energy booster stations, heavy industrial power centers and large-scale power transmission and distribution projects. The product is fully designed, manufactured and tested in accordance with the IEC 60076 series international standards, including IEC 60076-1, IEC 60076-2, IEC 60076-3, IEC 60076-5 and IEC 60076-10.
This transformer adopts full oxygen-free pure copper winding, low-loss high-grade silicon steel core, vacuum oil immersion treatment and standard on-load voltage regulation structure. It features high insulation reliability, excellent short-circuit resistance, low operating loss and stable continuous operation performance.
Two unified international bidding price standards are available:
0.0901 USD/W - Standard IEC efficiency model
0.102 USD/W - IEC ultra-low loss energy-saving model
The ultra-low loss version is about 13.21% higher in unit price, effectively reducing long-term grid operation loss and improving overall power system efficiency.
1. IEC-Compliant High-Grade Insulation System
The 220kV high-voltage winding adopts multi-layer composite insulating paper and integral shielding structure, fully complying with IEC 60076-3 dielectric test requirements.
Standard insulation withstand level:
Lightning impulse withstand voltage: 950kV peak
Power frequency withstand voltage: 395kV / 1min
The whole winding is processed by full vacuum drying and vacuum pressure oil impregnation, with extremely low partial discharge value, strong resistance to overvoltage, switching surge and lightning impact, ensuring long-term stable insulation performance under standard grid operating conditions.
2. Low-Loss Silicon Steel Core, Strict IEC Loss Evaluation
The iron core is made of high-permeability low-loss grain-oriented silicon steel sheets, adopting full miter lap cutting and no-hole binding process. All loss indicators are tested and evaluated in accordance with IEC 60076-10 standard test methods, ensuring accurate and reliable no-load loss and load loss data.
Two efficiency grades meet different project positioning:
Standard model (0.0901 USD/W): Complies with basic IEC efficiency requirements, cost-effective for conventional grid substation projects.
Ultra-low loss model (0.102 USD/W): Optimized electromagnetic structure, significantly reduces operating loss, suitable for 24-hour continuous operation key substations and large energy transmission projects.
3. Strong Short-Circuit Resistance (IEC 60076-5 Certified)
The winding structure and mechanical strength are designed in strict accordance with IEC 60076-5 short-circuit withstand standard. The high-purity copper transposed conductor and integral fixed clamping structure effectively resist electromagnetic impact caused by sudden short-circuit faults. No winding deformation, displacement or insulation damage occurs after standard short-circuit test, ensuring high safety and stability of power grid operation.
4. Standard On-Load Voltage Regulation System
Equipped with IEC-standard on-load tap changer, conventional tap range 220±8×1.25%. It can realize stepless voltage regulation under load without power interruption, adapt to grid voltage deviation and load fluctuation, and maintain stable output voltage of medium and low voltage sides.
5. Multi-Stage IEC Standard Cooling Mode
Support three internationally universal cooling modes: ONAN / ONAF / OFAF, fully compliant with IEC 60076-2 temperature rise limits. The cooling system matches the heat load of large-capacity main transformers, realizing stable heat dissipation under rated load, long-term overload and peak operating conditions, with low temperature rise and safe margin.
6. Complete IEC Standard Protection Configuration
Full set of standard protection components in line with international design specifications: oil conservator, capsule sealing system, pressure relief device, gas relay, oil temperature and winding temperature monitoring system, moisture absorber, sampling valve and complete grounding system. Realize over-temperature protection, gas fault protection, pressure protection and real-time operating data monitoring.
7. Standard Export Structure & Full Documentation
The tank body adopts thickened steel plate and standard outdoor anti-corrosion coating, with high structural strength and strong environmental adaptability. All sealing structures pass strict IEC standard tightness test to achieve zero oil leakage.
Complete export documents can be provided: IEC full set type test report, factory routine test report, ISO certificate, CE certificate, inspection data and all customs clearance documents.
8. Customization & After-Sales Service
Support full technical customization: capacity specification, voltage ratio (220/110kV, 220/35kV, 220/110/10.5kV), short-circuit impedance, tap range, cooling mode and communication protocol.
Provide 5-year global full machine warranty, lifelong spare parts supply at factory cost, complete English technical documents and operation manuals, and global technical support services.
1. Two-Winding 220kV Main Transformer
Rated Capacity (MVA) | HV/LV (kV) | Tap Range | No-Load Loss (kW) | Load Loss (kW) | No-Load Current (%) | Short-Circuit Impedance (%) |
|---|---|---|---|---|---|---|
31.5 | 220/10.5 | ±8×1.25% | 28.5 | 148 | 0.55 | 10.5 |
40 | 220/10.5 | ±8×1.25% | 33.8 | 175 | 0.50 | 10.5 |
50 | 220/10.5 | ±8×1.25% | 39.8 | 208 | 0.45 | 10.5 |
63 | 220/10.5 | ±8×1.25% | 46.5 | 245 | 0.42 | 10.5 |
80 | 220/10.5 | ±8×1.25% | 54.2 | 288 | 0.38 | 10.5 |
100 | 220/10.5 | ±8×1.25% | 62.8 | 335 | 0.35 | 10.5 |
2. Three-Winding 220kV Main Transformer
Capacity (MVA) | Voltage Ratio (kV) | No-Load Loss (kW) | Load Loss (kW) | No-Load Current (%) | Impedance HV-MV / HV-LV / MV-LV (%) |
|---|---|---|---|---|---|
50/50/50 | 220/110/10.5 | 43.5 | 225 | 0.48 | 10.5 / 18 / 6.5 |
63/63/63 | 220/110/10.5 | 50.8 | 262 | 0.45 | 10.5 / 18 / 6.5 |
80/80/80 | 220/110/10.5 | 59.5 | 306 | 0.40 | 10.5 / 18 / 6.5 |
Q1: What standards does this 220kV main transformer comply with?
A: Fully compliant with the full set of IEC 60076 international transformer standards, including insulation level, temperature rise, loss test, short-circuit resistance and partial discharge indicators, suitable for global international bidding projects.
Q2: What is the difference between the two price models?
A: 0.0901 USD/W is standard IEC efficiency model with low initial cost. 0.102 USD/W is IEC ultra-low loss high-efficiency model, with lower operating loss, suitable for long-term continuous operation projects, unit price increased by about 13.21%. Both adopt full pure copper winding.
Q3: Is short-circuit resistance tested according to IEC?
A: Yes. All products pass strict IEC 60076-5 short-circuit withstand test to ensure structural safety and electrical stability under grid fault conditions.
Q4: Can parameters be customized?
A: Fully customizable voltage ratio, capacity combination, impedance value, tap range, cooling method and protection configuration to meet different international project technical requirements.
Q5: What certification and test documents can be provided?
A: IEC type test report, routine test report, ISO9001 certificate, CE certificate, complete inspection data and full set of export technical documents.
Q6: Warranty and after-sales policy
A: 5-year global full machine warranty, lifelong cost-price spare parts supply, full English technical documents and global remote & on-site technical support.
