The transformer has a non-circular concentric coil structure, short-circuit impedances of 4.0, 4.5, and 5.0, and a temperature rise limit of 60K, which is lower than the 65K of S13 transformer. It belongs to the second level energy consumption model of oil immersed transformer.
The letter 'S' represents three-phase, 20 is the sequence code for transformer performance level, and S20 transformer is an oil immersed transformer with a performance code level of 20. The negative deviation meets the requirements of the second level energy efficiency standard for power transformers in GB 20052-2020 'Energy Efficiency Limits and Energy Efficiency Grades for Power Transformers', and is usually referred to as a second level energy efficiency transformer. 'NX2' means that the transformer meets the second level energy efficiency loss standard.
The loss value of S20 oil immersed transformer that meets the requirements of the 'Energy Efficiency Limit Values and Energy Efficiency Grades of Power Transformers (GB 20052-2020)' is called negative deviation; The negative deviation of S20 meets the second level energy efficiency standard.
In addition, there is also a national standard for S20, which allows a positive deviation of 10% in the total loss of S20 transformers. Therefore, S20 transformers may not necessarily have a negative deviation. Strictly speaking, S20 national standard transformers cannot strictly meet the second level energy efficiency loss standard.
Note: There are both positive and negative deviations, with a total loss not exceeding 10%. Positive deviation is referred to as the national standard, with a positive deviation greater than the limit value and a negative deviation smaller than the limit value. The negative deviation loss performance of transformers is superior to the national standard.
The difference between S20 transformer and S13 transformer lies in three aspects: energy saving, temperature rise, and noise. The S20-M series oil immersed transformer reduces no-load and load losses by 10% compared to S13 transformer, runs quieter, and is more in line with the national concept of energy conservation and emission reduction. It is a key energy-saving oil immersed transformer model to be promoted in the future.
Characteristics of S20 Transformer
The S20 oil immersed transformer has been optimized in both the iron core and coil, adopting a fully enclosed shell to adapt to outdoor wind and rain environments. It is commonly used in remote mountainous areas, rural power grid renovation, and some non chemical enterprises.
The iron core of the S20 transformer uses silicon steel sheets with better performance and higher grades. The coil winding is designed according to the second level energy efficiency loss standard, and the winding scheme and material of the transformer coil have been redesigned. Therefore, the temperature rise and loss of the S20 transformer winding have significant advantages over the S13 transformer.
S20 Transformer Price
The S20 oil immersed transformer meets higher requirements for the transformer core and coil, using better grade silicon steel sheets and copper wires. Therefore, the price of the S20 transformer is about 15% higher than that of the S13 transformer, but the power consumption of the S20 transformer is reduced by an average of about 10% per year compared to the S13 transformer, which is also more in line with the future direction.
At present, there are few manufacturers with the qualification to produce S20 oil immersed transformers. If you need to customize S20 transformers, you may come to our factory for on-site inspection and customize S20 model transformers.
