Level 2 energy efficiency of dry-type transformers

The **Level 2 energy efficiency** of dry-type transformers is an important indicator for measuring their energy 

conversion efficiency, indicating that the transformers meet the requirements of the secondary energy efficiency

 level in the national energy conservation standards and belong to **high-efficiency energy-saving products**. The following is an overview of the key information:

 I. Definition of Energy Efficiency Levels

According to the national standard **GB 20052-2020**, the energy efficiency of transformers is divided into three levels:

- **Level 1**: The highest energy efficiency with the lowest losses (the best energy-saving performance).

- **Level 2**: Higher energy efficiency with lower losses (belonging to energy-saving products).

- **Level 3**: Basic energy efficiency with higher losses (ordinary products).

**Basis for Classification**: No-load losses (iron losses) and load losses (copper losses). The lower the losses, 

the higher the energy efficiency level.

**Note**: The actual values may vary slightly due to the design of the transformer or updates to the standards.

 III. Core Advantages of Level 2 Energy Efficiency

1. **Energy Conservation and Consumption Reduction**: Compared with Level 3 energy efficiency, the no-load

 losses are reduced by approximately **10%-20%**, and the load losses are reduced by approximately **5%-15%**.

2. **Economic Benefits**: A large amount of electricity costs can be saved during long-term operation. **The higher 

the load rate, the more significant the energy-saving effect**.

3. **Policy Support**: It complies with the national "dual carbon" policy, and in some regions, subsidies, tax incentives,

 or additional points for green building certification can be enjoyed.

4. **High Reliability**: It usually uses **high-permeability silicon steel sheets and optimized winding designs**, 

resulting in a longer service life and lower maintenance costs.

 IV. Applicable Scenarios

- **Scenarios with High Load Rates**: Data centers, factories, hospitals, commercial complexes (load rate > 60%).

- **Continuous Operation Situations**: Projects that require 24-hour power supply, such as subways, airports, 

and base stations.

- **Projects with High Environmental Requirements**: Green buildings, new energy (photovoltaic and wind power) 

connection projects.

 V. How to Select Dry-Type Transformers with Level 2 Energy Efficiency

1. **Check the Label**: Confirm that the product is labeled as "GB 20052 Level 2 Energy Efficiency".

2. **Compare Parameters**: Give priority to models with **no-load losses ≤ standard values and load losses 

close to Level 1 energy efficiency**.

3. **Choose the Brand**: Brands such as Siemens, ABB, TBEA, and Chint are recommended, as they have mature 

technologies and perfect after-sales services.

4. **Calculate the Total Cost**: The initial cost is 5%-10% higher than that of Level 3, but **the price difference 

can be recovered through electricity savings within 3-5 years**.

 VII. Precautions

1. **Load Rate Matching**: If the load rate < 30%, the difference in electricity savings between Level 2 and 

Level 3 energy efficiency is small, and the cost can be given priority consideration.

2. **Operating Environment**: Ensure good ventilation (dry-type transformers rely on air cooling) to avoid 

the impact of high temperatures on efficiency.

3. **Maintenance**: Regularly clean the dust and check the temperature rise of the windings to ensure stable

 losses.

 Conclusion

Dry-type transformers with Level 2 energy efficiency are the **most cost-effective energy-saving choice** 

and are suitable for most scenarios. When selecting, it is necessary to consider the actual load, budget, 

and long-term benefits, which can not only reduce electricity costs but also comply with the national energy

 conservation trend.