Understanding Load kVA and Power Factor in Three Phase Transformers

Thread starter yecko
Start date Mar 31, 2019
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Phase Three phase Transformer

AI Thread Summary

The discussion centers on the difference in calculating line current for load kVA in two examples, specifically question 2.28 and example 2.7. In 2.28, the load is given in kW, necessitating the use of power factor (PF) for accurate line current calculations. Conversely, example 2.7 presents the load in kVA, which does not require PF for the calculation. The distinction arises from the need to convert kW to kVA using PF when the load is expressed in kW. Understanding this difference is crucial for accurate electrical calculations in three-phase transformers.

Mar 31, 2019

yecko

Gold Member

Homework Statement: see pic 1-3

Relevant Equations: load kVA = load/power factor

For question 2.28, the load kVA requires the use of power factor before calculating the line current, while eg 2.7 do not. May I ask why do they have the difference of using PF or not? Thank you.

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Mar 31, 2019

NascentOxygen

Staff Emeritus

Science Advisor

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In 2.28 you are given the load in kW. In 2.27 you are given the load in kVA.

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