How to Determine the Reasonable Capacity of Transformer

First of all to investigate the local power supply voltage, the user's actual electricity load and the conditions of the place, and then refer to the transformer nameplate marked technical data selected one by one, generally from the transformer capacity, voltage, current and environmental conditions into account, Should be based on the user's electrical equipment capacity, nature and use of time to determine the required load, in order to select the transformer capacity.
In normal operation, the oil type transformer should bear the load of the transformer rated capacity of about 75 to 90%. If the actual load of transformer is less than 50%, it should be replaced with small capacity transformer. If it is larger than the rated capacity of transformer, the transformer should be replaced immediately.
At the same time, the transformer in the choice of the power supply line to determine the polemounted transformer primary coil voltage, according to the secondary device voltage selection of electrical equipment, the best choice for low-voltage three-phase four-wire power supply system. This provides power for both electricity and lighting.
For the choice of current load should pay attention to the motor starting to meet the requirements of the motor (because the motor starting current sink operation than the large 4 to 7 times).