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Technical Notes

Guide To Transformers - Duty Cycle
If the load is not continuous and is much shorter than the thermal time constant (the time taken to reach steady on-load temperature, which can be several hours), a smaller transformer can often be specified. The following formula is helpful in calculating the rating needed.

Where: Power Nom. = Nominal transformer rating 
Power Load = Actual power in the load
t on = Load on time
t tot = Total cycle time


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