The 10kV S11 oil-immersed transformer with a stacked core structure is a new generation of energy-efficient transformer widely used in medium-voltage power distribution networks. It is designed to meet the demands of reduced energy loss, enhanced operational stability, and long service life in residential, industrial, and commercial power systems. This article provides a comprehensive overview of its technical features, design structure, and performance advantages.
Overview of the S11 Oil-Immersed Transformer
The S11 series is a widely adopted oil-immersed distribution transformer that operates at a rated voltage of 10kV. Compared to its predecessor, the S9 model, the S11 transformer significantly reduces no-load loss and noise while maintaining robust load capacity and insulation performance. It adopts high-quality silicon steel sheets and optimized electromagnetic design to improve efficiency and reduce operational costs.
Stacked Core Design for Efficiency and Stability
The S11 oil-immersed transformer features a stacked core structure, which distinguishes it from traditional wound-core types. This stacked core configuration reduces magnetic flux leakage and improves the uniformity of magnetic fields, leading to better energy transmission and lower core losses. The precision-laminated core uses high-grade cold-rolled grain-oriented silicon steel with a low loss coefficient to ensure stable performance during long-term operation.
The core limbs are tightly clamped and treated with anti-rust coating to reduce vibration and noise. The triangular three-phase stacking structure also contributes to reduced eddy current losses and improved magnetic circuit symmetry, ensuring smooth operation under all load conditions.
Technical Parameters
The typical technical specifications for a 10kV S11 oil-immersed transformer are as follows:
Rated capacity: 30kVA to 2500kVA
Rated voltage (high/low): 10/0.4 kV or customized
Connection group: Dyn11 or Yyn0
No-load loss: 10%–20% lower than S9 model
Load loss: In compliance with IEC 60076 and GB/T 6451 standards
Impedance voltage: 4% or 6% depending on capacity
Cooling method: ONAN (Oil Natural Air Natural)
Frequency: 50Hz / 60Hz
Insulation level: LI75AC35 (or customized as per client demand)
Transformer Oil and Tank Design
The S11 transformer uses high-purity mineral insulating oil that offers excellent dielectric strength and thermal conductivity. The oil not only acts as a coolant but also serves as an insulating medium between windings and core. The tank is fully sealed, preventing the ingress of moisture and contaminants. A corrugated oil tank or expansion conservator type is used to adapt to volume changes during thermal expansion, ensuring a hermetic seal throughout the product life cycle.
Protective accessories such as pressure relief valves, oil level indicators, and thermometers are integrated to enhance operational safety. Buchholz relays and gas alarms can be added for additional protection in higher voltage models.
Low Loss and High Efficiency
One of the most significant advantages of the S11 10kV oil-immersed transformer is its low no-load and load losses. It adopts advanced core joint processing and vacuum oil filling processes to enhance insulation quality. These design improvements contribute to a reduction in no-load loss by up to 30% compared with older models, making it ideal for long-term energy saving and eco-friendly applications. The efficiency of the transformer can exceed 98%, aligning with modern green energy policies.
Applications
The 10kV S11 oil-immersed transformer is widely used in:
Urban and rural distribution networks where stable voltage and high reliability are essential.
Industrial plants that require consistent voltage output for machinery operations.
Commercial buildings and shopping malls that depend on uninterrupted electricity supply.
Renewable energy projects such as solar and wind farms for grid connection and voltage transformation.
Public infrastructure including hospitals, schools, and transportation hubs for secure power supply.
Environmental Adaptability
The transformer operates reliably in diverse environmental conditions. It can be installed outdoors or indoors and performs well in areas with high humidity, dust, or extreme temperatures. Optional features include anti-corrosion coatings and moisture-proof sealed structures for coastal or alpine areas.
The 10kV S11 oil-immersed transformer with stacked core is a high-performance, energy-efficient, and environmentally friendly solution for modern power distribution. With its reduced energy loss, strong reliability, and long lifespan, it is a preferred choice for utilities, EPC contractors, and end-users aiming to improve power quality and reduce operating costs. Its compliance with international standards and customizable configurations further strengthen its role in global transformer applications.
Leave A Comment