S11 10kv Oil-Immersed Distribution Transformer

Summary
S11 series oil-immersed transformer adopts traditional compact structure with high reliability. This series of product adopts fully sealed oil tank, thus isolating the transformer oil from the air and slowing down the aging of transformer oil and insulators. This series of product uses traditional material and is efficient and energy-saving.

Introduction
1. Brief Description 
 S11 series oil-immersed transformer adopts traditional compact structure with high reliability. This series of product adopts fully sealed oil tank, thus isolating the transformer oil from the air and slowing down the aging of transformer oil and insulators. This series of product uses traditional material and is efficient and energy-saving. 
 
2. Application Scope 
 The product has been widely applied in new and reconstruction projects of urban and rural power grids. It is especially suitable for the areas where the electric energy is insufficient, the load fluctuation is big and the daily maintenance is difficult. As the transformer adopts fully sealed structure and avoids contact with the air, it may run in the humid environment and is the ideal power distribution equipment for urban and rural power distribution network.
 
3. Model Description

4. Standards
GB 1094.1, GB 1094.2,GB 1094.3, GB 1094.5
IEC 60076–1:2000, IEC 60076–2:1993, IEC 60076–3:2000, IEC 60076–5:2006,
GB/T 6451, GB/T 20052, etc

5. Normal Service Conditions
Height above sea level: Not greater than 1,000m;
Ambient temperature: Maximum temperature: +40ºC;
Maximum daily average temperature: +30ºC;
Maximum annual average temperature: +20ºC;
Minimum outdoor temperature: -25ºC;
Installation environment: ground acceleration caused by earthquake: ag<2m/s

6. Features
(1). Simple maintenance. 
(2). As the low voltage adopts copper foil winding, the electric field distribution of transformer is uniform. The low-voltage inner frame adopts formed hard paper tube, while the high-voltage outer half lap is wound with tasteless glass adhesive tape layer by layer. The compression pad adopts the laminated wood, thus enhancing the mechanical strength of the transformer. The transformer uses vacuum oil filling, which may totally eliminate the bubble in the coil, so as to improve the overall ability of the transformer to withstand the sudden short circuit.
(3). The tank rim adopts stainless steel bolts, with beautiful appearance.
(4). The oil tank adopts the fully sealed tank, thus isolating the transformer oil from the air, and slowing down the aging of transformer oil. The sealing elements adopt formed parts, with the sealing reliability of the transformer enhanced.

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