First of all, it is necessary to investigate the power supply voltage of the place where the power is used, the actual power load of the user and the local conditions, and then select one by one with reference to the technical data marked on the transformer nameplate, generally from the transformer capacity, voltage, current and environmental conditions, of which the capacity selection should be based on the capacity, nature and use time of the user's electrical equipment to determine the required load. To select the transformer capacity.

During normal operation, the electrical load borne by the transformer should be about 75 to 90% of the rated capacity of the transformer. When the actual load borne by the transformer is less than 50%, the small-capacity transformer should be replaced, and the large transformer should be replaced immediately if it is greater than the rated capacity of the transformer.

At the same time, in the selection of transformer according to the line power supply to determine the primary coil voltage value of the transformer, according to the electrical equipment to select the secondary coil voltage value, the best choice for low-voltage three-phase four-wire system power supply. This provides electricity for both power and lighting.

For the selection of current, it should be noted that the load can meet the requirements of the motor when the motor starts (because the motor starting current is 4 to 7 times larger than the sinking operation).

Additional Considerations

Future Load Growth: When selecting a transformer, it is important to consider not only the current load but also the potential for future load growth. If the load is expected to increase significantly in the future, it is advisable to select a transformer with a larger capacity than is currently needed. This will help to prevent the transformer from being overloaded in the future.

Environmental Factors: The environment in which the transformer will be installed can also affect its capacity selection. For example, transformers that will be installed in hot climates will need to have a higher capacity than transformers that will be installed in cooler climates. This is because the heat can reduce the transformer's efficiency and lead to overheating.

Maintenance Considerations: It is also important to consider maintenance when selecting a transformer. Transformers that are easy to maintain will be more cost-effective in the long run. This is because they will require less downtime and will be less likely to fail prematurely.

Consult with an Electrical Engineer: When selecting a transformer, it is always a good idea to consult with an electrical engineer. An electrical engineer can help you to assess your specific needs and select the right transformer for your application.

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