Answer Posted / athar abid

As we Know that

KVA = Sqrt 3 . Voltage(V) . Current(I)

Now for 400V (Phase-Phase) syayem

I = 500KVA/(1.732 * 400)
=500*1000/(1.732*400)
=721.7 Amps

There is no standard breaker available with this rating, so
take one step above rating i.e. 800Amps

Hope its clear.

Regards
Athar Abid

why actual valve timing diagram is different than ideal valve timing digram of a 4 stroke engine?

5621

---

What do you mean by turns ratio of instrument transformer?

1145

---

What is sink and source?

1257

---

Can anyone tell me some hints about what type of questions are asked by the interviewer by an Electronics engineer when company is installing an IPP and wants a team of engineers?

2250

---

Why it is possible to use PWM with a STATCOM and not with a conventional TCR based SVC

2160

---

WHAT IS LOAD CELL

2197

---

write down the formula of cable size in RM if current is 50Amp.

1382

---

ASTM D 3455 - Standard Test Methods for Compatibility of Construction Material with Electrical Insulating Oil of Petroleum Origin has been used for Testing Transformer Oils with a product placed in it. Aged Control Oil has a Power Factor of 0.032% at 100°C. Aged Oil with a Test component has a Power Factor of 0.093% at 100°. Is this increase acceptable? If not why? How much increase is acceptable?

2080

---

What are the limitations of Kirchoff's laws?

1646

---

what is a bus riser in power system and why it is used

46382

---

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

2213

---

How relay works, reverse relay, master relay, os relay, earth fault relay and what is its setting point

1876

---

What is industrial plc

1908

---

What is the difference IN MCCB's between thermal magnetic and electronic tripping system ?

2120

---

We have 110Vac ,10A ac supply which is converted into 110VDC & How much DC current? which factor is reqired for dc current calulation?

5229

---