What are the selection and precautions for oil-immersed transformers?

Time：2025-02-18    Auther：ZTelec-www.ztelectransformer.com

As an important equipment in the power system, the selection and precautions of oil-immersed transformers play a vital role in ensuring the stable operation of the power system, improving energy utilization efficiency, and ensuring personal and equipment safety. The following factors need to be considered when purchasing a suitable oil-immersed transformer:

1.Basic parameter selection

Capacity: Capacity is one of the most critical indicators when selecting a transformer. It should be selected according to the actual load demand to ensure that the transformer can operate stably under normal load and avoid waste of resources caused by excessive capacity. Generally speaking, the load rate of the transformer is more economical and reasonable when it is around 85%. Therefore, when selecting, the capacity of the transformer can be determined by calculating the actual load demand and reserving a certain margin.

Rated voltage: Choose the transformer according to the rated voltage of the power supply system. Make sure the rated voltage of the transformer matches the rated voltage of the power supply system.

Rated frequency: Frequency is another important parameter in the power system. The frequency of the oil-immersed transformer should be consistent with the grid frequency, usually 50Hz or 60Hz. When selecting, make sure that the frequency of the selected transformer matches the grid frequency.

2. Load requirements

Determine the rated capacity of the transformer according to the load requirements. The power demand of the load is proportional to the capacity of the transformer. Ensure that the rated capacity of the transformer can meet the load requirements.

3. Insulation level

The insulation level determines the voltage resistance and insulation performance of the transformer. Select the appropriate insulation level according to the use environment and insulation requirements of the transformer.

4. Cooling method

There are usually two cooling methods for oil-immersed transformers: natural cooling and forced cooling. Natural cooling is cooling through the transformer’s own heat dissipation, which is suitable for small-capacity transformers; forced cooling uses cooling equipment such as fans or pumps to enhance the cooling effect, which is suitable for large-capacity transformers. When choosing a cooling method, factors such as the transformer’s load and ambient temperature need to be considered.

5. Operating environment

For harsh climate conditions such as high temperature, heavy rain, and humidity, transformers with a strong protection level should be selected. These products can effectively prevent dust, moisture and other debris from entering the transformer, ensuring its long-term stable operation.

The choice of installation location also needs to consider the operation and maintenance needs of the transformer. For example, in earthquake-prone areas, transformers with better earthquake resistance should be selected; in places where explosion-proof is required, transformers with explosion-proof function should be selected.

6. Brand and quality

Purchase oil-immersed transformers from well-known brands to ensure reliable product quality and stable performance. You can evaluate from the companys reputation, after-sales service and other aspects.

7. Price

Price is one of the factors that cannot be ignored in the selection process. Users should make reasonable plans based on actual needs and economic capabilities and choose products with high cost performance. Within the budget, you can compare transformers of different brands and models, comprehensively consider their performance, quality, after-sales service and other factors, and find the solution that best meets your needs.