S13-M-30~6300/10 series of 3D Oil Immersed Transformer

The oil-immersed transformer with a three-dimensional wound core design represents a major advancement in energy-saving power technology. This type of transformer significantly optimizes the magnetic circuit structure and three-phase layout compared to traditional laminated designs, providing better performance, lower noise, stronger heat dissipation, and greater overload capacity.

Introduction to Three-Dimensional Wound Core Transformers

Models such as the three-dimensional wound core transformer, three-dimensional combined wound core transformer, three-dimensional combined three-phase wound core transformer, triangular three-dimensional wound core transformer, and three-dimensional triangular wound core transformer all refer to this innovative product type. In their model numbers, the letters "RL" typically appear, where "R" represents rolled core and "L" indicates the three-dimensional structure — for example, S13-MRL-6300/10 or SCB11-RL-1000/10.

The three-dimensional wound core transformer creatively reforms the traditional laminated magnetic circuit structure, achieving a fully symmetrical three-phase magnetic circuit. This results in a substantial energy-saving effect, significantly reduced noise, a more compact size, and enhanced heat dissipation and overload capabilities.

Core Construction and Structure

The key component is the three-dimensional wound core, composed of three identical single-frame cores. The stems and iron yokes have cross-sections close to semicircles. Combined, they form an equilateral triangular arrangement, with the core pillars nearly circular, minimizing the iron core weight and reducing no-load loss.

Key Features of Oil-Immersed Three-Dimensional Wound Core Transformers

1. Optimized Magnetic Circuit

• No seams between the core layers, ensuring even magnetic circuit distribution with no high-resistance areas or magnetic flux distortion.
• Magnetic flux direction fully aligns with the silicon steel sheet’s crystal orientation.
• Three-phase magnetic circuit lengths are completely equal, minimizing total circuit length.
• Complete three-phase symmetry leads to balanced no-load currents.

2. Low Loss and High Energy Efficiency

• The magnetization direction perfectly matches the rolling direction of the silicon steel sheet, drastically reducing core loss by 10-20% compared to laminated cores.
• Material usage in the iron yoke is reduced by 25%, lowering overall core weight by about 6%.
• Special high-temperature (800°C) annealing under vacuum with nitrogen improves silicon steel performance, enhancing magnetic properties and reducing losses.
• Testing shows the no-load loss is 25-35% lower than national standards, with no-load current reduced by up to 92%.

3. Ultra-Low Noise Operation

Noise in transformers generally originates from:

• Magnetostriction of the silicon steel sheet.
• Electromagnetic attraction caused by flux leakage between sheets.
• Excessive magnetic flux density nearing saturation points.

Thanks to the continuous and seamless structure of the rolled silicon steel strip in the three-dimensional wound core, noise caused by discontinuous magnetic circuits is eliminated. Combined with fully symmetrical three-phase magnetic circuits and reasonable magnetic density design, the product’s noise is drastically reduced. For example, the type test sound level of the SGB10-RL-2000/10 model is just 47dB, which is 19dB lower than the national standard 66dB, making it ideal for indoor and residential applications.

4. Exceptional Overload Capability

• Low heat generation: Due to extremely low no-load loss and no-load current, the transformer generates minimal heat.
• Natural cooling: The three-phase coil layout forms a central vertical “chimney” channel. Thanks to a 30-40°C temperature difference between the upper and lower iron yokes, strong natural convection occurs, quickly carrying away heat and ensuring effective cooling without forced ventilation.

5. Compact Structure and Space Saving

The innovative three-dimensional iron core results in a more compact structure and rational layout. Compared to traditional products, the footprint is reduced by 10-15%, and the unit height is lowered by 10-20%. When installed in a box-type substation, the transformer size can be reduced by nearly 25%, maximizing space efficiency.

The oil-immersed three-dimensional wound core transformer represents a significant technological leap, offering remarkable advantages in energy saving, noise reduction, overload resistance, and space optimization. Its adoption aligns perfectly with global trends toward energy conservation and environmental protection. For projects requiring reliable, efficient, and eco-friendly power solutions, these transformers are the ideal choice.

Performance parameters