How to select transformers

Mar 15, 2017

How to select transformers

Firstly, it is necessary to investigate the power supply voltage of the place where the electricity is used, the actual electricity load of the user, and the conditions of the location. Then, refer to the technical data indicated on the transformer nameplate to select one by one.

How to determine the reasonable capacity of a transformer?

Generally, transformer capacity, voltage, current, and environmental conditions should be considered comprehensively. The selection of capacity should be based on the capacity, nature, and usage time of the user's electrical equipment to determine the required load, in order to select the transformer capacity.

During normal operation, the transformer should withstand an electrical load of approximately 75-90% of its rated capacity. When the actual load borne by the transformer during operation is less than 50%, the small capacity transformer should be replaced. If it is greater than the rated capacity of the transformer, the large transformer should be replaced immediately.

At the same time, when selecting a transformer, the primary coil voltage value of the transformer is determined based on the line power supply, and the secondary coil voltage value is selected based on the electrical equipment. It is best to choose a low-voltage three-phase four wire power supply. This can provide both power and lighting electricity simultaneously.

When selecting the current, it is important to ensure that the load meets the requirements of the motor during start-up (as the starting current of the motor is 4-7 times higher than during sinking operation).

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How to select transformers

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