Two-winding transformer
1. On-load voltage regulation: Voltage regulation without power interruption, stable voltage, suitable for scenarios with large load fluctuations.
2. Forced oil circulation air cooling: Strong heat dissipation, high overload capacity, ideal for large-capacity main transformers.
3. Double winding: For 110 kV/220 kV main transformers — reliable operation and simple maintenance.
4. Excellent short-circuit resistance: Low partial discharge, good insulation, long service life.
5. Suitable for substations, industrial and mining stations with altitude reduction, new energy power plants, and large industrial parks.
1. Product Introduction
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 durable.
Its main function is efficient power transmission and flexible voltage regulation at high voltage levels. It is suitable for transmission and distribution scenarios of 110kV, 220kV, and other main power transmission and distribution systems, featuring large capacity, high stability, and low losses. It serves as key equipment for regional power grids, large industrial hubs, and new energy grid connections.
2. Technical parameters (customizable)
| Item | Core parameters (typical range) | Description |
Rated Capacity |
20000KVA-300000KVA |
Determines power transmission capacity, customizable |
Connection Group |
YNd11 |
Suppresses third harmonics, suitable for three-phase four-wire system |
No-load loss |
Low-loss design (≤15% lower than national standard) |
High-quality silicon steel core, energy-efficient |
Load loss |
Low-loss copper winding design |
Reduces long-term energy consumption in operation |
Cooling Mode |
OFAF/ONAF (Forced Oil Forced Air / Oil Natural Air Forced) |
High-efficiency heat dissipation for large-capacity transformers |
Sealed structure |
Capsule sealing / metal corrugated expansion type |
Isolates air and moisture, extends oil service life |
3. Main Features
High efficiency and energy saving
Uses cold-rolled oriented silicon steel sheet with low losses (thickness ≤0.3 mm) with a full-step lap-joint structure. This significantly reduces electricity costs in long-term operation.
Strong short-circuit resistance
The windings have tight coupling and directed cooling. The clamps and iron core are integrally reinforced to effectively withstand short-circuit electromagnetic forces and improve operational reliability.
Flexible voltage regulation
Equipped with an on-load tap changer, allowing stepless voltage regulation under load. It adapts to load fluctuations and ensures stable output voltage (regulation range ±5%).
Sealed and maintenance-free
Uses a sealed oil tank to isolate the transformer oil from the air, slowing oil aging, reducing maintenance workload, and extending service life.
High insulation and safety
High-voltage windings feature a continuous interleaved or inner shield structure with reinforced sections to improve impulse voltage distribution.
Strong adaptability
Multiple 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 primary equipment in key 110 kV/220 kV substations for regional power transmission and voltage conversion.
Large industrial hubs: applied in steel, petrochemical, data centers, and other high-load industrial bases.
Urban grid upgrades: suitable for city central substations and new district distribution projects with low noise requirements.
New energy grid connection: used at booster stations of wind and photovoltaic power plants for efficient grid integration.
Industrial and mining enterprises: provide specialized power supply for mines, chemical plants, and remote factories to ensure continuous production and safety.
