Answer / prakash.

First selected for ct ratio in HT panel.1000kva transformer full load current in primary 52.5amps.so ct ratio in 60amps(60/5).
Now relay setting for over current 55amps.
And earth fault setting 0.5amps in ct secondary amps..

Answer / k.prakashchandra

Normally EFR is set at 20% 0f OCR setting.

what is tan delta measurement?..... why that terminal is earthed.....?

4 Answers   Power Grid,

---

what is the meaning of transformer short circuit test?

7 Answers   HZL, L&T,

---

what is the mager value of star motor and delta motor between phase to ground and phase to phase, and minimum how much should be value ?

1 Answers  

---

the distance from my office to d.g is aprox 400mtrs and voltage drops ibn my office near about 40 volt what should i do p[ls suggest.

4 Answers  

---

how to get electrical supervisour certificate in gujarat

0 Answers  

---

---

how instantanious short circuit current is calculated ? its formula.

0 Answers   Crompton Greaves,

---

How we calculate the Multiplying Factor of Kwh meter for 3 phase alternator.

0 Answers   Cesco,

---

How can we measure earthing resistance test (Earth meggar) of Transformer neutral pit while in live condition?.

0 Answers  

---

why the flooring of substation is done with small pebbles or stones..?

16 Answers  

---

using in R,Y& B PHASE LTSIDE(415V)ct ratio 4000/5 WITH ENERGYMETR OF 1280 REV./KWH,240V.WHAT WILL BE MF OF METRE.

1 Answers   HCC,

---

What are the functions of temperature scanner in power transformer?

0 Answers   HCL,

---

Where can I get CPWD electrical shedule rates in web? please help me.

1 Answers  

---