polyphase circuit question?

Thread Starter

khatus

Joined Jul 2, 2018
91
Here, it is given terminal voltage is the closing side of the whole polygon. My question is how did this happen?
I can not understand the underlined lines.


IMG_20211024_0001 - Copy.jpg
 

MisterBill2

Joined Jan 23, 2018
9,824
If the voltages are represented by vectors then simple vector addition will explain how this works . If you do not understand vectors and the addition of vectors then I can not explain it to you, nor could others.
 

michael8

Joined Jan 11, 2015
233
Instationous power is the product of the voltage times the current at that instant. In a single phase circuit
the voltage is a sine wave and (for a resistive load) the current is also and in sync. Thus the
power transfered varies over time:

singlephase.png

With three phase the 3 separate pulses of power merge and from a constant flow of power.

threephase.png
 

MisterBill2

Joined Jan 23, 2018
9,824
Those three sine waves can also be represented by rotating vectors, which I think can make he explanation better. Once again, though, the TS needs to understand about vectors and how they can represent AC voltage and current.
 
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