A motor works on 30kw.it is working on 440volts.How much
amper will be Required?
Answers were Sorted based on User's Feedback
Answer / a.bala
Hai Ramya
The formula for I= KW/ 1.732x pf x Applied voltage in kv
So
KW =30
pf=0.8
Applied voltage = 440 v =440/1000=.440
30/ 1.732x0.8x.440=49.2 A
Is This Answer Correct ? | 7 Yes | 1 No |
Answer / dinesh raj
Voltage =440 V
Power Facter (cos@) = 0.8
Power P = 30kW = 30000W
Formula for 3phase power P = sqr(3)*V*I*cos@
So Current I = P/sqr(3)*V*cos@
I = 30000/1.732*440*0.8
So Required amper = 49.2 A
Is This Answer Correct ? | 6 Yes | 0 No |
Answer / a.bala
30 / Rt3xpfx voltage i KV
30/Rt3 x.8x.440= 49.2 A
Consider starter current 1.2 Time from running current
so 49.2 * 1.2= 59 A
sO you will selecte cable and breaker for 60 A.
Is This Answer Correct ? | 4 Yes | 1 No |
Answer / sidhu.k
Mr, bala your answer is correct i dont repeat it
again,thank you, i think ramyas dout is clear.
Is This Answer Correct ? | 0 Yes | 0 No |
Answer / ramendra shukla
Hi Dinesh you are correct but you have made a mistake- in
place of sqr(3) there will be root squre(3)
so Power,P = under root(3) VI Cos@
or P = 1.732 VI cos@
then you are correct while your calculation are correct.
Is This Answer Correct ? | 0 Yes | 2 No |
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