In normal operation, the power distribution load of the distribution transformer should be about 75~90% of the rated capacity of the transformer. When the actual load of the transformer is less than 50%, the small-capacity transformer should be replaced. If it is larger than the rated capacity of the transformer, replace the large transformer immediately.
At the same time, in selecting the transformer to determine the primary coil voltage value of the transformer according to the line power, and selecting the voltage value of the secondary coil according to the electric equipment, it is preferably selected as the low-voltage three-phase four-wire power supply. This provides both power and lighting power.
For the choice 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).
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