Answer Posted / 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.

can i connect REF and Differencial relay in 1 CT core for transformer protection?

2010

---

what are the precuation should be taken ahen installing power transformer,circuit breaker,current & potential transformer

2167

---

Readings of ER300P Trivector meter

6472

---

what is mean by NPS (Negative phase sequence)fault? what is the difference between EFR & OCR faults?

2423

---

Usually in the L & T make MCC feeders' power circuit,we have BMR after the MAIN CONTACTOR.,can we interchange their position, keeping the control logic same???

2175

---

What are the main parts of central chiller plant? Explain the function of each stage.

4856

---

what's the requirement of Dy11d0 connection of 3 phase transformer?what's use of it?

8040

---

What will happen if i used 11KV earth ht kit to 11 KV / 11 KV cable termination?

1478

---

Explain Need of a starter in a dc motor.? Also explain any two starting and speed control method of dc motor?

1772

---

what is the maximum permissible limit value of leakage current and leakage counter reading to replace lightining arrester?

5182

---

What is the meaning of utility ground and clean ground? How the distribution panel is grounded?

2597

---

what is the difference between surge protection capacitor and surge arrestor

2376

---

WTA used cb?

1982

---

in control panel, how can i measuring the distance between one bus bar to another bus bar. then now only for bus bar. in mpcb and contactor also. that means one mpcb to another mpcb how much distance? how can i calculate that.

2437

---

If 100 KAV USP dedicated earth got disconnect / Cut. What will happen at load.

2026

---