large power transformer
1. Three-winding design and multi-voltage output, capable of simultaneously adapting to multi-level power supply of 110 kV/35 kV/10 kV, reducing equipment costs and floor space.
2. On-load voltage regulation on the high-voltage side without power interruption, with good voltage stabilization effect, stable power quality, and adaptability to grid voltage fluctuations.
3. Low-loss and energy-saving design, with no-load losses reduced by ≥30% compared to S9, providing significant long-term economic benefits from operation.
4. High short-circuit resistance, robust coil and housing construction, and high operational reliability.
5. Fully sealed and maintenance-free, stable oil quality, low labor intensity and maintenance costs.
6. Low noise level and environmental protection, suitable for sensitive areas such as residential and commercial districts, with high adaptability to the environment.
1. Product Overview and Model Description
Three-phase three-winding oil-immersedSSZ series on-load voltage regulating transformer
Its main features include an independent three-winding power supply and on-load voltage stabilization without power interruption. It can simultaneously output three voltage levels (high, medium, and low), making it well-suited for multi-voltage power grids and multi-load scenarios. It is key equipment in 110 kV power transmission and distribution systems, characterized by multi-voltage output, energy saving, and voltage stabilization.
It is widely used in key 110 kV substations, regional power supply centers, large industrial parks, urban distribution network upgrades, new energy collection stations, and other locations requiring high power supply reliability, voltage stability, and multi-range output.
2. Main Technical Parameters (Customizable)
2.1 Main Parameters
Rated Power: 6300 kVA – 125000 kVA
Connection Group: YNyn0d11 (standard), YNyn0yn0 (optional)
2.2 Losses and Energy Efficiency
Energy Efficiency: High-efficiency energy saving
2.3 Online Voltage Regulation
Regulation Type: Real-time on-load voltage regulation (no power outage required)
Transformer: Oil-immersed
2.4 Other Key Parameters
Insulation Class:
Cooling method: ONAN / ONAF (OFAF used for high-power equipment)
Ambient temperature: -30℃ to +45℃
Altitude: ≤1000 meters (up to 4000 meters, customizable)
Transformer oil: industrial oil 25#
3. Design and Technical Specifications
3.1 Main Components
Multi-step stepped connecting elements, three-tooth structure.
No mounting holes, low vibration, low noise.
Phosphating and painting to prevent moisture and corrosion.
Winding cable cores reduce noise and losses.
3.2 Cooling System
ONAN: Natural cooling, low noise.
ONAF: Fan-assisted cooling, high overload capacity.
Intelligent temperature regulation, automatic fan control.
4. Main Product Advantages
Three-phase winding with multiple output voltages
Equipped with high, medium, and low voltage outputs; reduces equipment and space requirements.
Load adjustment without power interruption
Voltage stability, high adaptability to grid fluctuations, high power quality.
Ultra-low losses and high efficiency
Significant energy-saving effect; short payback period on investment.
Low noise and environmentally friendly
5. Application Scenarios
Power grid: key 110 kV substations, regional power supply, urban power grid modernization.
Large industrial enterprises: metallurgy, chemical industry, mining, cement industry, large industrial parks.
Urban construction: commercial areas, residential districts, metro, airports, railway stations.
New energy: photovoltaic and wind power, 110 kV collection and step-up stations.
Special environmental conditions: high-altitude plateaus, low temperatures, coastal salt spray, corrosion zones.
