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

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

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.

Answer / ramya

MR bala i con't understand your answer at(30/Rt3 x.8x.440=
49.2 A)
plz clear me this equvation

Answer / ramya

THANKS MR.BALA

Answer / sidhu.k

Mr, bala your answer is correct i dont repeat it
again,thank you, i think ramyas dout is clear.

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.

how does the switching of capacitors in a capacitor bank take place when we use them at the load side to reduce the power factor?

2 Answers  

what is static electricity and how it generates?

2 Answers  

how line turns ratio changes in 3 phase with change in connection

0 Answers  

What is meaning of DRU in gen.of AVR.

2 Answers  

Ratings of power transformer,Distribution transformer.

0 Answers  

How stabilizer works??

0 Answers  

Why is the neutral point of a star connected winding of a motor not grounded?

1 Answers  

The moisture in air will condense at

0 Answers   Caterpillar,

If there is 25 hp motor,which type of starters we can us? why?

7 Answers  

explain 100 percent and 95 percent earth faults

1 Answers  

how to calculate IR value of 33KV cable ??

0 Answers  

how brushless dc motor is operating ?

4 Answers