Transformer load reading calculation

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Discussion Overview

The discussion revolves around calculating the percentage loading of a transformer based on given electrical parameters, including current readings in different phases and the transformer's specifications. The context is practical application rather than theoretical or homework-related.

Discussion Character

  • Technical explanation
  • Mathematical reasoning

Main Points Raised

  • One participant requests assistance in calculating the percentage loading of a 500KVA transformer using provided current and voltage parameters.
  • Another participant asks for the original calculation to verify the approach and inquires if the request is for schoolwork.
  • A participant provides a calculation indicating that the full amperage load for the transformer is 695.62A and calculates an average current of 239.25A, leading to a percentage loading of 34.39%.
  • Another participant calculates the total kVA based on the current readings per phase, arriving at a total of 223.8 kVA.

Areas of Agreement / Disagreement

Participants present differing calculations regarding the percentage loading and total kVA, indicating that there is no consensus on the correct approach or outcome.

Contextual Notes

There are unresolved aspects regarding the assumptions made in the calculations, such as the treatment of neutral current and the method for calculating total kVA. The discussion reflects different interpretations of the data provided.

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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