Transformer parallel operation, the actual load of each transformer and transformer capacity is directly proportional to the transformer short-circuit voltage is inversely proportional. That is, S1:S2:S3=(S1E/U1D)/(S2E/U2D)/(S3E/U3D)=(1000/6.25%)/(1800/6.6%)/(3200/7%)=1:1.7045:2.8571

1+1.7045+2.8571=5.5616

Then the first The actual load of the first unit is 5500*1/5.5616=988, the equipment utilization rate is 988/1000=98.8%

The actual load of the second unit is 5500*1/5.5616=1685, the equipment utilization rate is 1685/1800=93.6%

The actual load of the third unit is 5500*1/5.5616=2825, the equipment utilization rate is 2825. 2825, equipment utilization is 2825/3200=88.3%

Through the calculation, it can be found that when the total load continues to increase, the smaller capacity transformer is overloaded first.