Transformer load reading calculation

AI Thread Summary
To calculate the percentage loading of a 500KVA transformer with given parameters, the total current across all phases is 957A, leading to an average of 239.25A. The full load current for the transformer is 695.62A. The calculated percentage loading is 34.39%, derived from dividing the average current by the full load current and multiplying by 100. Additionally, the total kVA load is calculated to be 223.8 kVA based on the current readings. The calculations confirm that the transformer is operating at approximately 34.39% of its capacity.
ope0409
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I need help to get the percentage current loading on this transformer with the following parameters
transformer size is 500KVA
Primary voltage is 11KV
Secondary voltage is 415v
power factor is 0.8
current in Red phase is 315A
Current in yellow phase is 302A
Current in blue phase is 317A
Neutral current is 23A

Please, what is the percentage loading of this transformer, i want to be sure my calculation is right
 
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Welcome to PF. :smile:

Please show us your calculation first. Also, is this for schoolwork?
 
it is not for school work but office work
for a 500KVA transformer, the full amperage load will be 695.62A (from I =(KVA *1000)/sq3 *V )
hence I have 315A + 302A + 317A + 23A =957A
average of the total amperage = 957/4 =239.25A
percentage loading = 239.25/695.62 * 100 =34.39%
i want to know if my calculation is correct
 
The load total kVA it is the sum of each load per phase. The total kVA=415/sqrt(3)*[315+302+317]=223.8 kVA
 
Babadag said:
The load total kVA it is the sum of each load per phase. The total kVA=415/sqrt(3)*[315+302+317]=223.8 kVA
thanks
 
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