Two-winding transformer
1. Voltage regulation under load: Voltage regulation without power off, stable voltage, suitable for scenarios with large load fluctuations.
2. Air cooling with forced oil circulation: Strong heat dissipation, high overload capacity, ideal for main transformers with large capacity.
3. Double winding: for 110kV/220kV main transformers, reliable operation and easy maintenance.
4. Excellent short circuit resistance: low partial discharge, good insulation, long service life.
5. Suitable for substations, industrial and mining stations with reduced altitudes, new power plants and large industrial parks.
1. Product introduction
A three-phase, double-winding, oil-immersed power transformer with forced oil circulation and on-load voltage regulation. It is highly energy efficient, has a long service life, and is characterized by durability.
Its primary function is efficient power transmission and flexible voltage regulation at high voltage levels. It is suitable for 110 kV, 220 kV, and other major power transmission and distribution systems, featuring high capacity, high stability, and low losses. It serves as key equipment for regional power grids, large industrial hubs, and new grid connections.
2. Technical parameters (customizable)
| Item | Kernel parameters (typical range) | Description |
Nominal capacity |
20,000 kVA-300,000 kVA |
Defines the power transfer capacity, configurable |
Connection group |
YNd11 |
Suppresses third harmonic, suitable for three-phase four-wire system |
Loss without load |
Low loss design (≤15% below national standard) |
High quality silicon steel core, energy |
Load Loss |
Low loss copper winding design |
Reduces long-term energy consumption during operation |
Cooling mode |
OFAF/ONAF (Forced Air Fuel/Oil Natural Air Support) |
Highly Efficient Heat Dissipation for High-Capacity Transformers |
Sealed design |
Capsule sealing / metal corrugated expansion type |
Isolates air and moisture, extends oil life |
3. Main features
High efficiency and energy saving
It utilizes low-loss cold-rolled oriented silicon steel sheet (thickness ≤0.3 mm) with a full-step, lug-type design. This significantly reduces long-term energy costs.
Strong short-circuit resistance
The windings are tightly bonded and have targeted cooling. The clamps and iron core are integrally reinforced to effectively resist short-circuiting and electromagnetic forces and improve operational reliability.
Flexible voltage regulation
Equipped with an on-load tap-changer, it allows for stepless voltage regulation under load. It adapts to load fluctuations and ensures a stable output voltage (adjustment range of ±5%).
Sealed and maintenance-free
Adopts sealed oil tank to isolate transformer oil from air, slow down oil aging, reduce maintenance burden and prolong service life.
High insulation and safety
The high voltage windings have a continuous interleaved or internal screen structure with reinforced sections to improve the distribution of pulse voltage.
Strong adaptability
Multi-voltage combinations and three-winding versions are available for customization, compatible with various power grids and industrial scenarios.
4. Application scenarios
Regional transmission networks: used as the main equipment in key 110 kV/220 kV substations for regional power transmission and voltage conversion.
Large industrial units: used in steel mills, petrochemical plants, data centers and other heavy-duty industrial bases.
Urban network modernization: suitable for urban central substations and new district distribution projects with low noise levels.
Grid connection: Used in wind and photovoltaic booster stations for efficient grid integration.
Industrial and Mining: Provides specialized power to mines, chemical industries, and remote plants to ensure continuous production and safety.
