Jiangsu Huachen Transformer Co.,Ltd.
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Our 220kV oil-immersed power transformer is an energy-saving, high-reliability power solution for high-voltage power transmission and distribution systems. We use advanced computer software to conduct quantitative analysis of electrical, magnetic, thermal and mechanical characteristics to optimize product structure, achieving a perfect match between performance and structural design. This 220kV class power transformer is available in on-load tap changing and off-circuit tap changing types, suitable for three-phase, 50Hz, 220kV and below power systems. Manufactured in a fully sealed air-conditioned modern workshop with intelligent production equipment and mature assembly technology, this series features low loss, low noise, low temperature rise, high reliability, zero leakage and maintenance-free operation, with all performance indicators reaching international advanced levels.
Through full-dimensional quantitative analysis of electromagnetic field, temperature field and mechanical stress, our 220kV on-load tap changing power transformer achieves optimal structural matching, effectively avoiding local overheating and structural deformation, ensuring long-term stable operation under high voltage and heavy load.
Optimized core and winding design greatly reduces no-load and load losses, fully meeting the requirements of GB20052-2024 energy efficiency standards, delivering significant long-term energy saving benefits for utility operators and large industrial users.
The transformer tank adopts a flat top structure with integral steel plate cutting, overall pre-assembly process and Sa2.5+ grade sandblasting anti-corrosion treatment. The oil conservator is designed with 3D finite element strength analysis and manufactured with automatic submerged arc welding, ensuring zero oil leakage and long-term maintenance-free operation.
The core adopts a six-step lap, fully mitered hole-free structure with continuous yoke design; windings are wound by vertical winding machines with pneumatic tensioning, dried by kerosene vapor phase drying, and pressed by 200t hydraulic press. Winding assembly is completed in a purification workshop, ensuring core-winding concentricity and product consistency.
Model | Rated Capacity (kVA) | Connection Group Label | HV Voltage Level (kV) | Tap Range | LV Voltage Level (kV) | No-Load Loss (W) | Load Loss (W) | Short-Circuit Impedance (%) | No-Load Current (%) |
|---|---|---|---|---|---|---|---|---|---|
SZ22 | 120000 | YNd11 | 220 | +8×1.25% | 66 | 41000 | 304000 | 14.0 | 0.36 |
SZ20 | 150000 | YNd11 | 220 | +8×1.25% | 66 | 58000 | 360000 | 14.0 | 0.33 |
SZ18 | 240000 | YNd11 | 220 | ±8×1.25% | 66 | 69000 | 511000 | 14.0 | 0.24 |
This 220kV oil-immersed power transformer is the core equipment for high-voltage power transmission, widely used in:
Thermal power, hydropower and other large-scale power plants
Regional main substations and power grid interconnection projects
Gigawatt-level wind farms and photovoltaic power generation bases
Large petrochemical and metallurgical industrial complexes
Heavy industry manufacturing bases and high-load industrial parks
Urban core area high-voltage power supply projects
We provide full-range customized solutions for different project scenarios:
Tap changing mode: on-load tap changer or off-circuit tap changer
Cooling system: ONAN, ONAF, OFAF configurable according to load requirements
Tap range: ±4×1.25% to ±8×1.25% adjustable
Winding material and structure: high-conductivity copper winding, multi-layer cylindrical or continuous winding structure options
Smart monitoring system: partial discharge online monitoring, oil quality monitoring, temperature remote transmission modules
Anti-corrosion customization for coastal, high altitude and desert areas
All our 220kV class power transformers are manufactured in strict compliance with GB 1094, GB/T 6451, IEC-60076 and other national and international standards, fully meeting the latest GB20052-2024 energy efficiency requirements. Each unit undergoes strict full-item factory tests and type tests before delivery to ensure zero defects. We provide full-cycle after-sales service, including pre-sales technical scheme design, on-site installation and commissioning guidance, operation and maintenance training, and 24-hour emergency technical support. For quotation and technical consultation, contact us via our official hotline or email.
Our 220kV power transformers are designed and manufactured in full compliance with GB 1094, GB/T 6451, GB/T16927, GB20052-2024, and international standards including IEC-60076 and IEC-60137, with all indicators meeting the latest version requirements.
On-load tap changing transformers can adjust tap position without power outage, suitable for scenarios with frequent voltage fluctuations and high power supply continuity requirements; off-circuit tap changing transformers adjust tap position when power is off, with simpler structure and lower cost, suitable for stable voltage scenarios with infrequent adjustment.
We achieve high reliability through full-process control: multi-physics optimized design, high-quality raw material selection, precision manufacturing in dust-free purification workshops, strict full-item pre-delivery testing, and zero-leakage structural design, ensuring stable operation for decades.
