How to select transformer? How to determine the reasonable capacity of transformer?

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First, investigate the power supply voltage of the power consumption place, 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, the transformer capacity, voltage, current and environmental conditions should be considered comprehensively. The capacity selection should determine the required load according to the capacity, nature and service time of the user's electrical equipment, so as to select the transformer capacity.

During normal operation, the power load borne by the transformer shall be about 75~90% of the rated capacity of the transformer. When it is measured that the actual load of the transformer is less than 50% during operation, the small capacity transformer shall be replaced. If it is greater than the rated capacity of the transformer, the large transformer shall be replaced immediately. At the same time, when selecting the transformer, the voltage value of the primary coil of the transformer is determined according to the line power supply, and the voltage value of the secondary coil is selected according to the electrical equipment, and the low-voltage three-phase four wire power supply is selected. In this way, power and lighting power can be provided at the same time.

For the selection of current, it shall be noted that the load can meet the requirements of the motor when the motor is started (because the starting current of the motor is 4~7 times greater than that during sinking operation).

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What kinds of tests should be carried out for transformers in operation?