Answer / prabhas

Motor current rating is calculated by using the formula
I= P/1.73*V*PF

Normany it is 1.8times of power of the motor will be their
in 420v 3 phase motor.

Ex: 500Kv HT motor 11kv voltage
is Approx. 32A is the rated current.
so 32.5 or 33A is OL Setting.

Answer / manish

=32*0.9
=28

To attain a powerfactor more than .95, how much kvr should we use for 100 HP of current

4 Answers   Bhel, Scooters India,

---

why we use star and delta connection?why we donot give the supply directly?

12 Answers   Hitech, Siemens, Tata Steel Limited,

---

We have 3 Gensets 1.500kva,2.380kva,3.250kva How can we connect in common busbar&we have variable load.

4 Answers  

---

Is the theorem applicable to ac sources?

0 Answers  

---

what is the difference between earth and neutral.

9 Answers   DLF,

---

what is mean by current

17 Answers   Wipro,

---

what are the sample questions asking to the test cunducting for electrical superwising lisence test?

0 Answers   APTransco,

---

In case of 3Phase Supply, Voltage R-Earth/Neutral - 220 Y-Earth/Neutral - 220 Z-Earth/Neutral - 220 Total is -> 660Volts Then Why it is said that 3Phase supply is 440

6 Answers   Hindustan Unilever Limited,

---

what is the cable size we can use for 11kv and 33kv ?

3 Answers  

---

What is the function of interposing current transformer?

0 Answers  

---

What is the meaning of Fault level rating?

1 Answers   Balrampur Chini Mill,

---

How do you determine the size of transformer radiators in a transformer?

0 Answers  

---