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mohsinhamid
Commentator

Join Date: May 2011
Posts: 91

Calculation to Find KVA

08/08/2011 2:00 AM

hai frnds...

i have 1000kva delta-star transformer... primary volt is 6.6kv and primary full load current is 87.5 amps

secondary volt is 433volt and full load sec amps is 1334.4 amps....

p=1.732*v*i tis equation is for both delta as well as star... to measure kva....

my question is why ve are using 1.732 common for calculating both star and delta..????
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Tornado
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Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
Posts: 21017
Good Answers: 795
#1

Re: calculation to find KVA

08/08/2011 2:16 AM

The "phasor diagram" describing a 3-phase network is an equilateral triangle plus three line segments joining each vertex to the center. From geometry, the sides of the triangle are √3 x the lengths of the vertex-to-center segments. 1.732 is a rounded-off version of √3.

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mohsinhamid
Commentator

Join Date: May 2011
Posts: 91
#2
In reply to #1

Re: calculation to find KVA

08/08/2011 4:44 AM

tnks for ur reply friend pls explain in detail please....... iam not getting the correct point what ur are mentioning.... pls eleborate me..... if u have daigram it will be help full for me frnd friend to understnd...
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th.sulthan
Active Contributor

Join Date: Jun 2011
Posts: 10
#3

Re: calculation to find KVA

08/08/2011 6:29 AM

normally 3 phase power = 3*Vph*Iph

in star, Vline = 1.732 * Vph so 3*(VLine/i.732)*Iph

In delta, Iline= 1.732*Iph so 3*(ILine/1.732)*Vph

so both connection power = 1.732*VLine*ILine
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