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justinanto1987
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Addition of Three Line Powers

09/04/2010 3:39 AM

I have three line power readings for a unbalanced system. How can I add these three readings to get total power consumption for a three phase system. If it were three individual phase powers, I can add it directly. But in this case what should I do?

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TonyS
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#1

Re: Addition of three line powers

09/04/2010 4:30 AM

(I1+I2+I3)*(V/Sqr3)

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justinanto1987
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#2
In reply to #1

Re: Addition of three line powers

09/04/2010 4:42 AM

Dear Tony,

I have only power reading, don't know the current and power factor. Power factor of each line is different and power consumption of each lines are also different. So according to you can I get total power consumption as (w1 + w2 + w3)/sqr3

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TonyS
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#3
In reply to #2

Re: Addition of three line powers

09/04/2010 5:55 AM

Are you taking the power readings from 3 individual KWHr meters? If so just add them together. A polyphase meter does it for you.

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justinanto1987
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#4
In reply to #3

Re: Addition of three line powers

09/05/2010 12:54 AM

Yes, getting from three individual meters. Please note that it is not phase power, but line powers.

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Anonymous Poster
#5
In reply to #3

Re: Addition of three line powers

09/05/2010 2:19 AM

Power is a scaler quantity and not vector (unlike V or I).

The addition hence will be simple arithmatical.
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Anonymous Poster
#6
In reply to #5

Re: Addition of three line powers

09/05/2010 2:20 AM

Sorry correct it as

and not vector Phasor
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