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 Topic Title: Power per phase of a delta motor Topic Summary: Created On: 28 March 2013 09:41 PM Status: Read Only Linear : Threading : Single : Branch
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 28 March 2013 09:41 PM MAXMIRA Posts: 79 Joined: 25 January 2011 Originally posted by: MAXMIRA Hi all, Can anyone help me I have been given a load schedule for a 35kw delta connected motor. The load schedule shows the 35kw spread across the three phases I.e. 11.66kw per phase. I think this is incorrect as I would put it as 35kw per phase. Can anyone tell me which is the correct method and possibly back it up with some maths. Your help would be much appreciated. Maxmira 29 March 2013 10:58 PM Vidas Posts: 6 Joined: 28 October 2011 31 March 2013 12:33 AM cwd65 Posts: 8 Joined: 16 March 2012 35 kw motor delta connected line current=p/root 3 x u x pf x efficientcy 35000/1.732x400x0.8x0.85 line current up to 74.29 amps flc check details on motor rating plate 31 March 2013 08:34 PM Vidas Posts: 6 Joined: 28 October 2011 Originally posted by: cwd65 35 kw motor delta connected line current=p/root 3 x u x pf x efficientcy 35000/1.732x400x0.8x0.85 line current up to 74.29 amps flc check details on motor rating plate Dear cwd65, Maxmira asked power per phase not current. Your formula correct for calculating current with power factor 0.8 and efficiency 85%. Unless, Power factor and Efficiency can be any numbers (not exactly 0.8 and 0.85 as you stated). Look at my answer for the power calculation at the link above. 05 April 2013 02:17 PM MAXMIRA Posts: 79 Joined: 25 January 2011 Many thanks to you all
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