Three-phase transformer capacity calculation method
1. Calculate the maximum power of each phase of the load
Place A, The load power of each phase of B phase and C phase is added independently. For example, the total power of phase A load is 10KW, the total power of phase B load is 9KW, and the total power of phase C load is 11KW. The maximum value is 11KW. (Note: The power of each single-phase device is calculated according to the maximum value on the nameplate. The power of three-phase devices divided by 3 is equal to the power of each phase of this device.)
For example: the total power of phase C load = (Computer 300W Power)
3. Three-phase total power/0.8, this is the most important step. More than 90% of the transformers currently sold on the market have a power factor of only 0.8, so the power factor needs to be divided by 0.8.
33KW / 0.8 = 41.25KW (total transformer power)
4. Total transformer power / 0.85. According to the “Power Engineering Design Manual”, the transformer capacity should be selected based on the calculated load. For a single transformer that supplies power with a steady load, the load factor is generally about 85%.
41.25KW / 0.85 = 48.529KW (the power of the transformer that needs to be purchased), then just choose a 50KVA transformer when purchasing.
Notes
When purchasing, you need to ask the manufacturer for the power factor of the transformer, which is the actual load capacity of the transformer. The power factor of most transformers It is 0.8, and some manufacturers use 0.7.
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