Calculation for a radial supply system

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Homework Help Overview

The discussion revolves around a calculation for a radial supply system, specifically focusing on the total load represented in complex form. The original poster is attempting to understand how certain values were derived, particularly the imaginary components of the load calculations.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • The original poster describes their understanding of how to derive certain values from MVA and power factor but struggles with the imaginary components. Some participants question the representation of the numbers and the context of the calculations, seeking clarification on what the values signify.

Discussion Status

The discussion is ongoing, with participants exploring different aspects of the problem. Some guidance has been offered regarding the relationship between power factor and reactive power, but there is no explicit consensus on the calculations or interpretations yet.

Contextual Notes

Participants are working within the constraints of homework guidelines, and there is an indication of missing information regarding the system diagram and specific definitions of the terms used in the calculations.

wsharrock
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Homework Statement


[/B]
Im working through my HNC with the answers but i do not know how they have come to the numbers below.Total load = 1.5/-60 degrees + 2.3/-18 degrees.

=(0.75−j1.3)+(2.19−j0.71)
2. Homework Equations .

Not sure yet

The Attempt at a Solution



I understand how they have got to 0.75 and 2.19 it is MVA multiplied by the power factor.
I have tried all calculations but i can not get to the j1.3 and the j0.71.
Im fine with everything else. I know it will be something simple I'm missing
 

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wsharrock said:
I have tried all calculations but i can not get to the j1.3 and the j0.71.
You'll have to explain what you tried.
 
Last time I checked, lagging power factor means an inductive load. What do your numbers (0.75 - j1.3) represent? Ohms? Current? something else?
What are they asking for? All I see is a diagram of the system.
 
I see you understand how to get the MW from the MVA. You use the PF.

To get the reactive power, Mvar, you need to use the reactive power factor, QF, where

upload_2017-4-11_13-54-4.png
 

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