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 Topic Title: transformer size Topic Summary: question about 100kVA transformer Created On: 16 February 2013 04:55 AM Status: Read Only Linear : Threading : Single : Branch
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 16 February 2013 04:55 AM fitzpatrick1976 Posts: 31 Joined: 15 December 2006 Ignoring p.f. for simplicity: Am I correct in saying that a single phase transformer produces more amps than same sized three phase transformer? for 100kva transformer single phase power = vi 100000/230 = 434 amps in total three phase power = root3 v.i 100000/1.73x400 = 144 amps in total? Is this correct? or am I missing something obvious, like is I actually per phase for three phase? 16 February 2013 02:45 PM sfchew Posts: 589 Joined: 10 December 2002 Your single and 3 phase currents are correct. Regards Chris Chew 16 February 2013 07:47 PM fitzpatrick1976 Posts: 31 Joined: 15 December 2006 three phase power = root3 v.i 100000/1.73x400 = 144 amps in total ???? is the 144 amps for all three phases in total or one phase giving a total of approx 144*3=332 amps in total? 18 February 2013 12:49 PM hpcompaq Posts: 78 Joined: 27 September 2007 Hello. 144 amps in each of the three phases. 21 February 2013 01:14 AM fitzpatrick1976 Posts: 31 Joined: 15 December 2006 thanks for that.... I am surprised by how many electrical engineers dont know the answer to this one.
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