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Motor Rating


gul

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sir,

 

dears,

 

i have three phase induction motor and the name plate parameters are as under

 

1) horse power=10

 

2) power in va=7.5kva

 

3) rated current=14a

 

4) rated voltage =420v

 

now according to three phas eequation the power VA= rated voltage*current*1.732

 

= 420*14*1.732=10184VA=10.184KVA

 

THIS VALUE IS DIFFERENT FROM THE NAME PLATE VALUE i.e power 7.5kva

 

so explain this difference factor?

 

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Hello gul

 

The rating in 2) should read 7.5KW, not KVA

 

KW = KVA x eff x pf.

 

Best regads,

Mark.

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  • 5 weeks later...

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