Answer Posted / robert nithin

mv= (VD*1000)/L*I

VD= VOLTAGE DROP(AS PER COUNTRY STANDARDS)
L = LENGTH OF CABLE
I = CURRENT RATING
I = P/(1.73*V*PF)
PF= POWER FACTOR
MV= MILLI VOLTAGE DROP/AMP/METER

SELECT THE CABLE DEPENDING UPON THE MV RATING IN PRODUCT CATALOGS

a 230v transformer with step down ratio 19:1.it has 2000turns on primary and rated 25va calculate max primary current no of secondary turns volts/turn

1538

---

why do we not use equivalent voltage source in negative sequence equivalent ckt.

2042

---

where solid grounding and where grounding through ngr done and why?

2575

---

need to make a report. Need to choose a 3phase induction motor. Load conditions motor will operate in : Maximum Load: 30 Kw Speed: 2950 rpm Ambient temp: 20 cent Supply voltage: 440V Frequency: 50Hz need to look for the safety factor when choosing the motor, went through catalouge found a few, but dont know how to choose the safety factor allowing an extra load something above 30 KW to avoid any harm.

1818

---

Explain marx circuit.

1330

---

When MICC cables used ?

2076

---

Do Phase angle measurement have any application in freq/harmonics measurement? If so how?

1937

---

Why we use auxillary relay ? what is function of differential relay, directional o/c relay?

2195

---

Define end float in a motor?

5939

---

How could a garment factory benefit from renewable energy

2762

---

what is the difference between earthing and unearth

3088

---

Can Anyone suggest the Standards (IEC or IS) for selecting copper current density?

1399

---

Explain few advantages of electric traction system?

1127

---

why motor range is available 22kv,30kv,37kv,45kv and so on? why motor range is not available 21kv,24,25,26,27kv and so on?

2794

---

What is method of calculating the fault current for a MDB, 50KW, 3PH, 415V, 50HZ?

2140

---