S11-M Series Fully Sealed Oil-Immersed Power Transformer

Product Overview

The S11-M series fully sealed oil-immersed power transformers developed and produced by our company feature low loss, low noise, and high efficiency, achieving excellent energy-saving effects and reducing pollution. Compared with ordinary oil-immersed transformers, fully sealed transformers eliminate the need for an oil conservator. Oil volume changes are automatically compensated by the elasticity of the corrugated oil tank's bellows, isolating the transformer from air, preventing and slowing oil deterioration and insulation aging, enhancing operational reliability, and requiring no maintenance during normal operation.

Terms of use

• Maximum ambient temperature: +40°C
• Minimum ambient temperature: -25°C
• Elevation:
• Maximum monthly average relative humidity: 90% (20°C
).
• Installation location: Installed indoors or outdoors in locations free from fire, explosion hazards, severe contamination, chemical corrosion, or severe vibration.

Model meaning

Model: S11-M □ / □

• S: Three-phase
• 11: Performance level code
• M: Fully sealed
• □: Rated capacity (kVA).
• □: Voltage level (kV
).

Product features

The
• transformer core is made by stacking imported high-quality cold-rolled silicon steel sheets, greatly reducing no-load losses and no-load current, and the core is tied together to ensure its tightness and reduce noise.
• High and low voltage windings are wound with oxygen-free copper; low-voltage windings of 500kVA and below use double-layer cylindrical structures; 630kVA and above use double-helix or four-helix structures; high-voltage windings use multi-layer cylindrical structures.
• The transformer connection group uses Dyn11 to reduce harmonic effects on the grid and improve power supply quality.
• The transformer features a fully sealed structure, extending service life, eliminating the need for a core suspension and maintenance.
• Measured noise levels are below the standard.
• After normal transportation, this series of transformers can be installed without a core inspection and can be installed for acceptance testing. Once qualified, they can be put into operation.

Technical specifications

Main product performance parameters of the S11 10KV twin-winding series

Note: The load loss values above the slashes in the table apply to Dyn11 or Yzn11 connection groups, while those below the slashes apply to Yyn0.

Main product performance parameters of the 11-type 20KV twin-winding series

Note: This 20KV transformer can be customized according to customer requirements, with dual-voltage wiring available on the high-voltage side. The transformer input can be switched using a selector switch based on the difference in network voltage between 20KV and 10KV.

Insulation is level

S13 fully sealed oil-immersed power transformer

Product Overview

The S13 model is a product independently developed by our company based on the original S11 distribution transformer, combining research and application of new materials and processes, independent innovation, and technology introduction. Through the optimization and innovative design of the core and coil structure, it aims to reduce no-load losses and noise. No-load losses have dropped by an average of 20%. Noise levels have decreased by an average of 20% compared to the current national standard JB/T10088-2016, and product performance levels have reached advanced domestic levels.

Model meaning

Model: S13-M □ / □

• S: Three-phase
• 13: Performance level code
• M: Fully sealed
• □: Rated capacity (kVA).
• □: Voltage level (kV
).

Technical specifications

Main performance parameters of the S13 10KV twin-winding series