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Topic Title: Power per phase of a delta motor
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Created On: 28 March 2013 09:41 PM
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 28 March 2013 09:41 PM
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MAXMIRA

Posts: 78
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
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Vidas

Posts: 6
Joined: 28 October 2011

 31 March 2013 12:33 AM
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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
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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
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MAXMIRA

Posts: 78
Joined: 25 January 2011

Many thanks to you all
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